Download MicroNet InTagral Plus Specifications

Magic Aire Factory Control Options
I0M# 011-200001-003
MicroNet LONMARK® 200 Series Controllers
The I/A Series MicroNet LONMARK 200 Series
Controllers MN 200 is an interoperable, LONMARK-certified
controllers. Controllers are loaded with a pre-engineered application,
that provides control for Magic Aire unit ventilators.
Controllers feature Sensor Link (S-Link) support, LED indication,
screw terminal blocks and are panel mounted in the left end
compartment. These controllers can function in either standalone
mode or as part of a LONWORKS® FTT-10 Free Topology
communications network that must be field provided.
Applications
Designed for new or existing system installations,
the MN controller provides control for:
• Unit Ventilators
Controllers offer the advantages of standalone and
networked control. Using an I/A Series MicroNet
Sensor (MN-SX series), the operator can monitor
controller performance and edit operational values.
Connectivity
The WorkPlace Tech Tool software is used to
program the controllers.
Features —
• Field programmable using WorkPlace Tech Tool.
• Uses LONMARK HVAC profiles for
interoperability.
• Capability to function in standalone mode or as
part of a LONWORKS FTT-10 Free Topology
communications network.
• Multiple controllers on a LonWorks FTT network
creates a complex network of controllers for virtually
any building control needs.
• Proportional (P) damper control and Proportional
Plus Integral (PI) for heating and cooling control.,
and Proportional Plus Integral and Derivative (PID)
control for cooling and heating.
• Onboard LED indication without cover removal.
• Plenum-rated enclosure allows direct mounting in
plenum.
• Protective hinged covers provide access to field
wiring terminals.
Hardware Specifications
Dimensions 4 5/16" high x 4 3/8" wide x 2" deep
(109 mm x 111 mm x 51 mm).
Enclosure Conforms to NEMA-1 requirements.
Meets UL94-5V flammability for plenum application use.
Power Supply Input 20.4 to 30 Vac, 50/60 Hz.
Maximum Power Consumption 15 VA @ 24 Vac,
Surge Immunity Compliance
ANSI C62.41 (IEEE-587, Category A & B).
Agency Listings
FCC, Class B.
UL Listed
UL-916 (File # E71385 Category PAZX).
UL Listed to Canadian Safety Standards (CAN/CSA
C22.2).
European Community – EMC Directive
Emissions EN50081-1.
Immunity EN50082-1.
Mounting 35 mm DIN rail or panel.
Ambient Limits Operating Temperature -40 to 140
°F (-40 to 60 °C).
Shipping and Storage Temperature -40 to 160 °F
(-40 to 71 °C).
Humidity 5 to 95% RH, non-condensing.
Wiring Terminals Screw terminals.
AWG #16 to #24 (1.5 mm2 maximum) wire.
Inputs (from I/A Series MicroNet Sensors)
Space Temperature 32 to 122 °F (0 to 50 °C).
Adjustable Setpoints 40 to 95 °F (4.4 to 35 °C).
Override Pushbutton For standalone occupancy
control or remote status monitoring of local status
condition.
Digital Inputs Dry Contact.
Detection of closed switch requires less than 300 ohms.
Detection of open switch requires more than 100K ohms.
Digital Outputs
50/60 Hz, excluding relay output power.
7/1/03
Part Number 011-200001-003
Current Ratings 24 VA at 24 Vac, pilot duty.
Universal Inputs
10KW Thermistor w/ 11KW Shunt Resistor -40
to 250 °F (-40 to 121 °C) range. TS-5700-850 or
equivalent.
Voltage 0 to 5 Vdc.
Current 0 to 20 mA requires an external 500 ohm shunt
resistor.
Digital Input Dry Contact. Detection of closed switch
requires less than 300 ohm. Detection of open switch
requires more than 1.5K ohm.
Analog Outputs
Current 0 to 20 mA. (Output load from 80 to 550 ohms).
Software Capabilities
•
•
•
LONMARK-compatible.
HVAC interoperability achieved through use of
LONMARK HVAC profiles.
Pre-packaged factory installed software customized
for optimum unit operation.
Communications
LONWORKS Networks A LONWORKS
communications network uses an FTT-10 Free Topology
configuration. Controllers on a LONWORKS network can
communicate with each other in a peer-to-peer fashion,
and connect to the WorkPlace Tech Tool software
platforms via the LON Jack on any LonMark controller or
on any MN-Sx sensor. The wall sensor must be
connected to the LON network. A LONWORKS network
has acommunications speed of 78k baud, using
unshielded,twisted-pair cabling.
S-Link A Sensor Link (S-Link) communications wiring
provides power and communication interface to the I/A
Series MicroNet sensor (MN-SX series). It uses two-wire,
unshielded cable and is not polarity sensitive. From some
sensor models, the user can view and adjust application
parameters. Maximum wire length allowed between a
controller and the I/A Series MicroNet Sensor is 200 ft.
(61 m).
In a continuing effort toward product improvement the following
PRODUCT INFORMATION IS SUBJECT TO CHANGE WITHOUT NOTICE
7/1/03
Part Number 011-200001-003
1) Dual-Mount Thermostat (Wall Thermostat) ................................................................. 2
A)
B)
C)
D)
E)
F)
Use ........................................................................................................................................................2
Keypad Layout and Display Icons .....................................................................................................2
Adjusting Setpoints.............................................................................................................................2
Unoccupied Override ..........................................................................................................................2
Remote Mounting (Wall Mounting) ....................................................................................................3
Thermostat Accessories.....................................................................................................................4
2) Discharge Air, Outdoor Air, and Room Air Sensors.................................................. 4
A)
B)
C)
D)
E)
Description...........................................................................................................................................4
Sensor Location ..................................................................................................................................4
Measurement & Scale .........................................................................................................................5
Sensor Calibration...............................................................................................................................5
Sensing Room Temperature - Wall Thermostat vs. Room Air Temp. Sensor...............................5
3) System Diagnostics ...................................................................................................... 5
A)
B)
C)
D)
Sensor Diagnostics with Display Points - Preferred Method..........................................................5
Display of Controller Diagnostics with dual-mount thermostat.....................................................6
Initiating Controller Self-Diagnostics. ...............................................................................................6
Controller Lights (LEDs) .....................................................................................................................7
4) Standard Inputs ............................................................................................................. 7
A)
B)
C)
D)
Water Coil Low Limit ...........................................................................................................................7
Occupancy Input .................................................................................................................................7
Change-over Input...............................................................................................................................7
Refrigerant Low Limit..........................................................................................................................7
5) Standard Outputs .......................................................................................................... 7
A)
B)
C)
D)
E)
Outdoor Air / Return Air Damper Actuator .......................................................................................7
Face and Bypass Damper Actuator...................................................................................................8
2-Pipe Valve Controlled Unit ..............................................................................................................8
4-Pipe Valve Controlled Unit ..............................................................................................................8
Binary (Relay) Outputs........................................................................................................................8
6) Sequences of Operation ............................................................................................... 8
A)
B)
C)
D)
E)
F)
G)
H)
I)
J)
K)
2-Pipe unit (steam/water), Damper Control ......................................................................................9
2-Pipe Unit (steam/water), Valve Control ........................................................................................10
4-pipe unit (hot water or steam and chilled water), Damper Control ...........................................11
4-pipe unit (hot water or steam and chilled water), Valve Control ...............................................12
Electric Heat Only..............................................................................................................................13
DX cooling only .................................................................................................................................14
DX Cooling with Electric Heat ..........................................................................................................15
DX Cooling with Wet Heat, Damper Control ...................................................................................16
DX Cooling with Wet Heat, Valve Control .......................................................................................17
Damper Controlled Chilled Water Cooling with Electric Heat ......................................................18
Valve Controlled Chilled Water Cooling with Electric Heat ..........................................................19
7) Typical Unit Wiring ...................................................................................................... 20
A)
B)
C)
D)
E)
F)
Control Diagram, 2-pipe Damper Control .......................................................................................20
Control Diagram, 2-pipe Valve Control ...........................................................................................21
Control Diagram, 4-pipe, Damper Control ......................................................................................22
Control Diagram, 4-pipe, Valve Control ..........................................................................................23
Control Diagram, DX with Electric Heat ..........................................................................................24
Power Diagram 115V Unit with DX output. .....................................................................................25
8) Parts List...................................................................................................................... 26
A) Standard Control Parts .....................................................................................................................26
B) Instructions for Ordering Replacement Controllers ......................................................................26
9) Troubleshooting Chart ................................................................................................ 27
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Part Number 011-200001-003
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1) Dual-Mount Thermostat (Wall Thermostat)
A) Use
The dual-mount thermostat or "wall 'stat" is factory mounted in the unit for setpoint adjustment and
diagnostics. As factory wired, this thermostat is NOT used to sense temperature. This thermostat may
be removed from the unit and remotely mounted. In the remote location, the thermostat may be used
for setpoint adjustment and diagnostics, but it can also be used to sense the space temperature. See
Section 1-E for mounting details and instructions on using this thermostat to sense space temperature.
B) Keypad Layout and Display Icons
Figure 1 - Buttons & Icons
LCD Display
73.9
°F
°C
%
AUTO
Setpoint Button
Up/Down Button
Mode Button
Fan Button
Override Button
Override LED
Cool
Fan
Heat
On
%
Off
Outdoor Air
Relative Humidity
Unoccupied
C) Adjusting Setpoints
The Mode Button and Fan Button are not used.
The setpoint button is used in conjunction with the up/down button to set one of four setpoints. Press
the setpoint button once to get the first setpoint, twice for the second setpoint, etc. Use the up/down
button to increase/decrease the setpoint value. The setpoints are:
Setpoint #
(1)
(2)
(3)
(4)
Point
Range
Default
Icons Displayed
1
Space Setpoint
65 - 85 °F
74 °F
°F
2
Unoccupied Offset
0 - 15 °F
5 °F
°F, Unoccupied
3
Minimum Position
0 - 100 %
10 %
%, Cool
4
Deadband
1.5-3 °F
2 °F
°F
Space Setpoint - Used to calculate the heating and cooling setpoints.
Unoccupied Offset - Used to calculate the unoccupied heating and cooling setpoints. This value is
added to the cooling setpoint and subtracted from the heating setpoint.
Minimum Position - sets the minimum position of the outdoor air damper in terms of damper
actuator position. Value is used only in occupied mode.
Deadband - offset value used calculate the heating and cooling setpoints.
Occupancy Offset = 0°F in occupied mode and Unoccupied Offset in unoccupied mode.
Heating setpoint = Space Setpoint - Deadband - Occupancy Offset. Cooling setpoint = Space Setpoint +
Deadband + Occupancy Offset.
D) Unoccupied Override
A single press of the override button is used to provide a 2 hour unoccupied override. The override LED
is lit during override. The occupancy override may be canceled by pressing the override button for more
than 4 seconds, but less than 8 seconds.
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E) Remote Mounting (Wall Mounting)
The dual-mount thermostat is factory mounted on the control panel. This thermostat may be mounted in
the space for setpoint control and to sense the space temperature. This thermostat may be mounted
directly to a wall, a 2x4 electrical box, a 1/4 DIN electrical box, or a surface mount electrical box.
The sensor link (S-LK) wiring requires at least 24 gauge, twisted pair, voice grade telephone wire.
Shielded wire is not required; however, this cable type is recommended. The maximum wire length is
200 ft. The capacitance between conductors cannot be more than 32 pF per foot. If shielded cable is
used, the capacitance between any one of the conductors and the other conductors (connected to the
shield) cannot exceed 60 pF per foot.
The sensor link wiring and any LON network wiring, must have dedicated wire pairs. These wire pairs
must not be part of an active, bundled telephone trunk. The sensor link wiring and LON wiring should
not be routed with any Class 1 power wiring. The sensor link wiring may be routed with any of the low
voltage controller wiring, including LON. LON wiring must not be routed with any of the low voltage
controller wiring, except the sensor link wires.
The thermostat subbase provides terminals for the sensor link wiring and LON network wiring. These
terminals are used connect the LON jack on the subbase to the LON network. The thermostat does not
connect to the LON network. If these optional terminals are used with shielded wire, the shield should
be connected to the shield of the network conductors at the controller. The LON network shield must be
connected to earth ground through a 470-ohm resistor at only one end of the network.
To remotely mount the thermostat:
(1) Disconnect Unit power.
(2) Unsnap the thermostat faceplate from the subbase. Remove the thermostat faceplate by placing the
thumb in the center of the thermostat and pulling on the top edge of the plate.
(3) Unscrew the two small screws that secure the thermostat to the subbase.
(4) Disconnect the yellow S-LK wires from the S-LK terminals of the unit controller and from terminals 1
and 2 of the subbase.
(5) Remove the two screws that hold the subbase to the controller mounting plate.
(6) Move the subbase to the mounting location and feed the sensor link (S-LK) and LON wires (if used)
through the back of the subbase.
(7) Mount the subbase. The wiring terminals should be at the top end of the subbase. For direct wallmount, 2x4 box mount, and surface mount boxes, use mounting holes 1 and 3. For 1/4 DIN boxes,
uses mounting holes 1 and 2. See Figure 2. Use the appropriate flathead screws, such as 6-32 x
5/8", to attach the subbase to the box or wall. When attaching to directly to drywall, use anchors as
necessary.
(8) The sensor link wires (S-LK or U-link) connect to subbase terminals 1 and 2; these wires are not
polarity sensitive. If used, the LON wires connect subbase terminals 3 and 4; these wires are not
polarity sensitive. Connect the S-LK wires to the S-LK terminals of the controller. If used, connect
the LON wires to the LON terminals of the controller.
(9) Push the excess wire back through the subbase and insulate the opening to minimize air drafts from
an unconditioned space.
(10)Hold the t'stat with the display out and oriented towards the top of the t'stat. Set the t'stat circuit
board so that the bottom edge is captured by the mounting hooks near the bottom of the subbase.
(11)Secure the t'stat to the subbase by tightening the two small screws near the top, outer edge of the
t'stat.
(12)Snap the faceplate back onto the t'stat. Snap in the bottom edge first and then the top edge.
(13)If using the t'stat to detect space temperature, disconnect the unit mounted room air temperature
sensor (RAT) from the controller (terminals UI1 and COM).
(14)Apply unit power and verify t'stat operation.
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Part Number 011-200001-003
Page 3
2.69"
1.50"
0.31"
0.70"
1
1.91"
4
2
3.08"
3.95"
5
3
Figure 2 - Subbase Mounting Holes & Dimensions
F) Thermostat Accessories
The following accessories are not offered from the factory, but can be purchased from Invensys Building
Systems.
(1) Thermostat Locking Cover - When a locking cover is required for a dual-mount thermostat that is
mounted in the space, Invensys part AT-1155 may be used.
(2) Thermostat Guard - When a thermostat guard (non-locking) is required for a dual-mount thermostat,
Invensys parts AT-1104 (Cast Aluminum) and AT-1163 (Wire Guard) may be used.
(3) Remote Space Temperature Sensor - This sensor may be field wired in place of the factory
mounted room air sensor (RAT). Unlike the dual-mount thermostat (which remains in the unit), this
sensor does not allow setpoint adjustments nor does it provide a display. This is Invensys part
TSMN-57011-850.
2) Discharge Air, Outdoor Air, and Room Air Sensors
A) Description
The discharge air, outdoor air, and room air sensors use a 2-wire, 10K-thermistor element with an 11K
shunt. These sensors have a maximum error rate of +/- 0.36°F over 32° to 158°F. These sensors have
a maximum drift of 0.045°F per year, over the 32° to 158°F temperature range.
B) Sensor Location
The discharge air temperature (DAT) sensor is located in the discharge air stream. On some units, this
sensor is mounted in the discharge of the left most blower scroll. On later model units, this sensor is
mounted behind the "front" access panel, with the sensor located between the coil and a fan inlet.
The outdoor air temperature (OAT) sensor is located on the left-end of the unit. This sensor projects into
the outdoor air stream, immediately upstream of the outdoor air damper.
The room air temperature sensor (RAT) is located behind the decorative room air grille in "front" access
panel. This sensor is mounted near the room air intake hole on the blower section. It is important that
this sensor remain outside the blower compartment.
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C) Measurement & Scale
At least one of the sensor wires must be disconnected from the controller before resistance
measurements are taken. A digital multimeter or other low voltage ohmmeter may be used to measure
the sensor resistance.
Important: Units with water/steam coils are equipped with a low limit thermostat.
This thermostat is wired in parallel with the outdoor air temperature sensor, such
that the sensor is shorted when the thermostat closes for low limit conditions.
Nominal Temperature vs. Resistance
°C
°F
Ohms
-40
-40
10517
-30
-22
10172
-20
-4
9654
-10
14
8933
0
32
8044
10
50
6938
20
68
5798
25
77
5238
30
86
4696
40
104
3707
50
122
2875
60
140
2206
70
158
1685
80
176
1287
90
194
986
100
212
760
110
230
590
120
248
462
D) Sensor Calibration
Out of range sensors must be replaced, as these sensors cannot be calibrated.
E) Sensing Room Temperature - Wall Thermostat vs. Room Air Temp. Sensor
These units are factory configured to use the room air temperature sensor (RAT) as the space
temperature control point. The controller will use one of three inputs as the space temperature value.
The first valid input, ordered as shown below, will be used as the space temperature input.
(1) LON network (nviSpaceTemp) - If the controller is connected to a LON network and this point is
bound to a valid temperature, then this temperature shall be used as the space temperature input.
(2) Room Air Temperature Sensor (RAT) - shall be used as the space temperature input if there is no
network input.
(3) Dual-Mount Thermostat (Wall t'stat) shall be used as the space temperature input, if the room air
sensor input is not valid. The RAT sensor MUST be disconnected to allow the wall t'stat to sense
room temperature.
3) System Diagnostics
A) Sensor Diagnostics with Display Points - Preferred Method
The display on the dual mount thermostat can be used to verify the unit controller is receiving an
accurate temperature signal. This is the preferred method for verifying the operation of the temperature
sensors, since the actual sensor values are displayed. A damaged sensor may provide an input that is
within the allowable range of temperatures, but may be far from the true temperature.
The up and down keys of the thermostat can be used to view four controller points. The four points are
(1) Space Temperature, (2) Discharge Air Temperature, (3) Outdoor Air Temperature, and (4) Outdoor
Air damper position. A display value of "ABn" indicates that the sensor input is out of the allowed range
(ABnormal). See Section 1 for details on the thermostat.
(1) Space Temperature is the default display value. This value is obtained from one of three sources:
LON Network, Room Air Temperature Sensor, and the dual mount thermostat.
(2) The discharge air temperature is the value returned from the discharge air temperature sensor.
(3) The outdoor air temperature is the value returned from the outdoor air temperature sensor.
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(4) The outdoor air damper position returns the percentage of full-scale output (20mA) being sent
through the proportionally controlled actuator. Unlike the other display points, this is not a sensed
value. This represents the percentage output of the control algorithm.
B) Display of Controller Diagnostics with dual-mount thermostat
This method will detect sensors that are out of the allowable scale, but it cannot detect a sensor that is
out of calibration. This method requires inputs from the dual mount thermostat; see Section 1 for
thermostat details, such as keypad layout. These diagnostics provide the following data: (1) Subnet
Address; (2) Node Address; (3) Errors; (4) Alarms; (5) Temperature Offset; and (6) Relative Humidity
Offset. Instructions on how to get to the diagnostic screen follow the explanation of diagnostic values.
(1) Subnet Address - display indicates "Add" then displays the numerical value of the subnet address.
(2) Node Address - display indicates "nod" then displays the numerical value of the node address.
(3) Errors - The error displays the value of any current errors detected by the controller. The display
indicates "Err" then displays a numerical code representing all the current errors. If the controller
detects no errors, "---" is displayed instead of a numerical code. A single error code is used to
display all errors. When the controller detects multiple errors, the error code is the sum of all
current error codes. For example, if the controller detects errors 2, 4, and 8, error code 14 is
displayed. The following table provides a list of the single error codes and suggested actions for
each.
Code
--1
2
4
8
16
32
Condition
No Errors.
EEPROM error
RAT sensor out of Range★
DAT sensor out of Range
OAT sensor out of Range
Analog Output Error
Calibration Error
Resolution Path
Test Controller
Test RAT sensor - See Section 2★
Test DAT sensor - See Section 2
Test OAT sensor - See Section 2
Test Controller
Test Controller
★This error condition is normal when the dual-mount thermostat is used to
detect room temperature.
When an EEPROM error, Analog Output Error, or Calibration Error is detected,
reset the controller by removing power for 15 seconds. If the error condition
remains when power is re-applied to the controller, the controller is internally
damaged and must be replaced.
(4) Alarms - This code shows the error codes for the last four alarms reported by the controller. This
feature is not supported.
(5) Temperature Offset - This value adds an offset of -99 to 99°F to temperature value reported by the
dual-mount thermostat. This value has no effect on the temperature reported by the room air
sensor (RAT) sensor or a network space temperature value.
(6) Humidity Offset - This value is NOT USED.
C) Initiating Controller Self-Diagnostics.
(1) To initiate the diagnostics display, press both ends of the up/down key for 4 seconds. When
diagnostics are initiated, the thermostat will display the address codes.
(2) Press the UP/Down Key to scroll through the Address, Errors, and Alarms in this mode.
(3) Press the Override key to display the Temperature Offset value. Use the Up/Down Key to adjust
this value.
(4) Press the Override key again to display to Humidity Offset value.
(5) Press the Override key again to return to the Address, Errors, and Alarms display.
(6) Press both ends of the up/down key to return to the normal display screen. The sensor will
automatically return to the normal display screen if the keypad is idle for 30 seconds.
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Part Number 011-200001-003
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D) Controller Lights (LEDs)
The controller is equipped with 3 LEDs that are green (closest to edge of controller), yellow, and red
(closest to center of controller).
(1) Green - Power and Data Transmission LED. If this light is off, check controller power. Under
operation conditions, this light should flicker or be ON. This light will flicker when data is being
transmitted onto the communications network.
(2) Yellow - Data Reception LED. This light will flicker when data is being received from the
communications network.
(3) Red - Service LED. This light will flicker when a controller is being programmed over the network.
If the light steadily blinks at the rate of once per second, the controller is not programmed. Contact
the factory for a replacement controller.
If this light remains ON, the controller has detected an internal error and requires service. Remove
controller power for 15 seconds, and then restore power. If the LED remains ON, check the
controller power supply (nominal 24 VAC across terminals 24H and 24G). If the LED remains ON,
turn off the unit and replace the controller.
4) Standard Inputs
The following inputs are the digital (binary) inputs used with the controller. Some items are optional and
others are used only with specific control packages. Please see Section 6 for details on the unit sequence of
operation.
A) Water Coil Low Limit
This input is attached to the coil used on all units with steam or water. A low limit switch is connected in
parallel with the outdoor air temperature sensor (OAT). When the low limit switch closes, it short circuits
the OAT sensor input, thus initiating low limit mode.
B) Occupancy Input
If the unit is connected to a LON network and the network occupancy input is bound to an occupancy
controller, the network initiates occupied/unoccupied modes, regardless of the status of the physical
occupancy input. Without a network, all units use controller digital input 1 (DI1, terminal #26) for the
occupancy status input. When terminal DI1 is connected (input switch closed) to a common terminal
(COM, #22), the controller switches to unoccupied mode, unless the unoccupied override button on the
dual-mount thermostat is pressed. When terminal DI1 is disconnected from COM, the unit enters
occupied mode.
This input may be factory connected to an optional day/night relay, where the relay coil must be field
wired to an occupancy controller. This relay is factory wired so that the relay is energized for unoccupied
mode and de-energized for occupied mode. When ordered, this relay is mounted on the control panel.
This input may be factory connected to an optional 7-day timeclock. This timeclock has an override
switch (holiday switch) built into the clock face that can be used to force the unit into occupied or
unoccupied modes. When ordered, this timeclock is mounted on the control panel.
C) Change-over Input
This input is used only on 2-pipe, systems with chilled water. A changeover switch (aquastat) is
connected between controller terminals DI2 (#24) and COM (#25). The switch contacts close when the
switch senses that the water temperature is below 65°F, thus indicating that chilled water is available
and initiating cooling mode. The unit enters heating mode when the contacts open at 85°F.
D) Refrigerant Low Limit
This input is used with DX coils on self-contained unit ventilators. A low limit switch is connected
between controller terminals DI2 (#24) and COM (#25). The switch contacts close when the DX coil
temperature falls below 28°F, thus prompting the controller to disable the compressor.
5) Standard Outputs
Some output items are optional and others are used only with specific control packages. Please see Section
6 for details on the unit sequence of operation.
A) Outdoor Air / Return Air Damper Actuator
This actuator is connected to 24 VAC power and is controlled with a 4-20 mA signal from Analog Output
1 (AO1, #23). The actuator will close the outdoor air damper on a power failure. A 4 mA signal drives
the damper fully closed, while a 20 mA signal drives the actuator to full open position.
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B) Face and Bypass Damper Actuator
This non-spring return actuator is connected to 24 VAC power and is controlled with a 4-20 mA signal
from Analog Output 2 (AO2, #21). A 4 mA signal drives the damper into full bypass position (closed),
while a 20 mA signal drives the actuator to the full face position (open).
C) 2-Pipe Valve Controlled Unit
A proportional valve is used on all 2-pipe (steam, chilled water and/or hot water) units. The valve
actuator is connected to 24 VAC power and is controlled with a 0-20 mA signal from Analog Output 2
(AO2, #21). The valve will return to the full open position on a loss of power. A 0 mA signal drives the
valve fully open, while a 20 mA signal drives the valve fully closed.
D) 4-Pipe Valve Controlled Unit
A proportional valve is used control the heating valve (steam or hot water) as described above.
A floating point (tri-state) valve is used to control the cooling valve (chilled water). The valve actuator is
connected to 24 VAC power and will fully close on a loss of power. Binary (Relay) Output 5 (NO5, #13)
is energized to drive the chilled water valve open, while Output 6 (NO6, #15) is energized to drive the
chilled water valve closed.
E) Binary (Relay) Outputs
(1) Fan control - the Fan Relay (FR1) is connected to Output 1 (NO1, #5). This output is energized to
start the fan and de-energized to stop the fan
(2) DX cooling Control - On self-contained units and units with DX cooling, the DX control circuit is
connected to NO5, #13. This output is energized to start the compressor/condenser and deenergized to disengage the compressor/condenser.
(3) Electric Heat Control - 1st stage electric heat relay (HR1) is connected to NO2 (#7). 2nd stage
electric heat relay (HR2) is connected toNO3 (#9). 3rd stage electric heat relay (HR3) is connected
to NO4 (#11). These outputs are energized to engage the electric heat stage and de-energized to
disengage the stage.
(4) Radiant Heat Control - when this option is ordered on units with water/steam heating, a relay (HR1)
is added to control radiant heat. The coil of this relay is connected to NO2, #7.
6) Sequences of Operation
The following sequences of operation detail each ASHRAE Cycle II control configuration.
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Part Number 011-200001-003
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A) 2-Pipe unit (steam/water), Damper Control
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
The unit enters cooling mode when the optional changeover t'stat contacts close to indicate that chilled water
is available. Since there is no changeover t'stat on heating only units, such units will not enter mechanical
cooling mode.
When the space temperature exceeds the cooling setpoint, a proportional-integral control loop shall position
the face & bypass damper to maintain the space temperature.
The face and bypass damper shall be driven closed (full bypass) if the discharge air temperature falls below
55°F. The damper shall be held closed until the discharge air temperature rises above 57°F.
Heating Operation
The unit enters heating mode when the optional changeover t'stat contacts open to indicate that hot water is
available. Heating only units shall not have a changeover t'stat.
When the space temperature falls below the heating setpoint, a proportional-integral control loop shall position
the face & bypass damper to maintain the space temperature.
The face and bypass damper shall be driven open (full face) if the low limit thermostat trips (closes) OR the
discharge air temperature falls below 55°F. The damper shall remain open until the low limit thermostat is
opened AND the discharge air temperature exceeds 57°F.
In heating mode, the face & bypass damper shall be closed when the discharge air temperature exceeds
130°F. This damper shall remain closed until the discharge air temperature falls below 110°F.
End-of-Cycle Valve Operation (Optional)
A normally open, 2-position valve with return on power failure is optionally used as an end-of-cycle (EOC)
valve. This valve prevents radiant effects from overcooling/overheating the space when the face & bypass
damper is in the full bypass position. The EOC valve shall open when the face & bypass damper is
commanded to open. If the outdoor air temperature falls below 40°F, the EOC valve shall be forced open,
regardless of the face & bypass damper position.
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature.
The outdoor air damper shall be closed in low limit conditions (See Safeties).
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall be closed if the space temperature rises more than 3°F above the cooling
setpoint, while chilled water is available (changeover t'stat closed). The damper will not open until the space
temperature falls to less than 2°F above the cooling setpoint. If chilled water is not available, the damper
continues to operate under normal control.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds 68°F, while
chilled water is available. If chilled water is unavailable, the damper continues to operate under normal control.
The outdoor air damper shall be controlled with a proportional control loop based upon the deviation from
setpoint. The outdoor air damper shall begin to modulate open from minimum position when the space
temperature exceeds the (space setpoint - 0.5°F). The outdoor air damper shall be fully open when the space
temperature rises 1.5°F above the setpoint. Except as noted in the paragraphs above, the outdoor air damper
shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the low limit thermostat trips OR the discharge air temperature falls below 55°F, the unit enters low limit
mode. This shall drive the outdoor air damper closed. In heating mode, this shall force the face & bypass
damper into full face position and the optional EOC valve shall open. In cooling mode, this shall force the face
& bypass damper into full bypass position and the optional EOC valve shall close.
Normal unit operation shall resume when the discharge air temperature exceeds 57°F AND the low limit
thermostat opens.
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B) 2-Pipe Unit (steam/water), Valve Control
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
The unit enters cooling mode when the optional changeover t'stat contacts close to indicate that chilled water
is available. Since there is no changeover t'stat on heating only units, such units will not enter mechanical
cooling mode. Heating only units will use outdoor air, when applicable, for cooling; please see the Outdoor Air
Damper Operation section for operational details.
When the space temperature exceeds the cooling setpoint, a proportional-integral control loop shall position
the control valve to maintain the space temperature.
If the discharge air temperature falls below 55°F, the control valve shall be closed. The valve shall remain
closed until the discharge air temperature rises above 57°F.
Heating Operation
The unit enters heating mode when the optional changeover t'stat contacts open to indicate that hot water is
available. Heating only units shall not have a changeover t'stat; such units operate only in heating mode.
When the space temperature falls below the heating setpoint, a proportional-integral control loop shall position
the control valve to maintain the space temperature.
The control valve shall be driven open if the low limit thermostat trips (closes) OR the discharge air
temperature falls below 55°F. The valve shall remain open until the low limit thermostat is opened AND the
discharge air temperature exceeds 57°F.
In heating mode, the control valve shall be closed when the discharge air temperature exceeds 130°F. The
valve shall remain closed until the discharge air temperature falls below 110°F.
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature.
The outdoor air damper shall be closed in low limit conditions (See Safeties).
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall be closed if the space temperature rises more than 3°F above the cooling
setpoint, while chilled water is available (changeover t'stat closed). The damper will not open until the space
temperature falls to less than 2°F above the cooling setpoint. If chilled water is not available, the damper
continues to operate under normal control.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds 68°F, while
chilled water is available. If chilled water is unavailable, the damper continues to operate under normal control.
The outdoor air damper shall be controlled with a proportional control loop based upon the deviation from
setpoint. The outdoor air damper shall begin to modulate open from minimum position when the space
temperature exceeds the (space setpoint - 0.5°F). The outdoor air damper shall be fully open when the space
temperature rises 1.5°F above the setpoint. Except as noted in the paragraphs above, the outdoor air damper
shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the low limit thermostat trips OR the discharge air temperature falls below 55°F, the unit enters low limit
mode. This shall drive the outdoor air damper closed. In heating mode, this shall drive the control valve open.
In cooling mode, this shall drive the control valve closed.
Normal unit operation shall resume when the discharge air temperature exceeds 57°F AND the low limit
thermostat opens.
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C) 4-pipe unit (hot water or steam and chilled water), Damper Control
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
When the space temperature exceeds the cooling setpoint a proportional-integral control loop shall position
the face & bypass damper to maintain the space temperature. When the space temperature falls below the
cooling setpoint, the face & bypass damper shall be closed (bypass).
If the discharge air temperature falls below 55°F OR the low limit thermostat closes, the face and bypass
damper shall be driven closed (full bypass). This damper shall remain closed until the discharge air
temperature rises above 57°F AND the low limit thermostat opens.
Heating Operation
When the space temperature falls below the heating setpoint, a proportional-integral control loop shall position
the face & bypass damper to maintain the space temperature. When the space temperature exceeds the
heating setpoint, the face & bypass damper shall be closed (bypass).
If the discharge air temperature falls below 55°F OR the low limit thermostat closes, the face and bypass
damper shall be driven open (full face). This damper shall remain open until the discharge air temperature
rises above 57°F AND the low limit thermostat opens.
If the discharge air temperature exceeds 130°F, the face & bypass damper shall be driven closed. This
damper shall remain closed until the discharge air temperature falls below 110°F.
End-of-Cycle Valve Operation
2-position valves with return on power failure are used as end-of-cycle (EOC) valves. These valves prevent
radiant effects from overcooling/overheating the space when the face & bypass damper is in the full bypass
position.
If the space temperature is at or above the cooling setpoint, the cooling EOC valve shall open. This valve shall
close when the when the space temperature falls below the cooling setpoint. If the low limit thermostat trips
OR the discharge air temperature falls below 55°F, the cooling EOC valve shall drive closed.
If the discharge air temperature exceeds 130°F, the heating EOC valve shall close and remain closed until the
discharge air temperature drops below 110°F, regardless of other conditions. If the outdoor air temperature
falls below 40°F OR the low limit thermostat closes, the heating EOC valve shall be opened and shall remain
open until the outdoor air temperature exceeds 44°F AND the low limit thermostat opens. If the space
temperature falls below the heating setpoint, the heating EOC valve shall open.
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature.
The outdoor air damper shall be closed in low limit conditions (See Safeties).
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall be closed if the space temperature rises more than 3°F above the cooling
setpoint. The damper will not open until the space temperature falls within 2°F of the cooling setpoint.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds 68°F
The outdoor air damper shall be controlled with a proportional control loop based upon the deviation from
setpoint. The outdoor air damper shall begin to modulate open from minimum position when the space
temperature exceeds the (space setpoint - 0.5°F). The outdoor air damper shall be fully open when the space
temperature rises 1.5°F above the setpoint. Except as noted in the paragraphs above, the outdoor air damper
shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the low limit thermostat trips OR the discharge air temperature falls below 55°F, the unit enters low limit
mode. This shall drive the outdoor air damper closed. In heating mode, this shall force the face & bypass
damper into full-face position and the optional heating EOC valve shall open. In cooling mode, this shall force
the face & bypass damper into full bypass position and the optional cooling EOC valve shall close.
Normal unit operation shall resume when the discharge air temperature exceeds 57°F and the low limit
thermostat opens.
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D) 4-pipe unit (hot water or steam and chilled water), Valve Control
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
When the space temperature exceeds the cooling setpoint, a proportional-integral control loop shall position
the cooling valve to maintain the space temperature. When the space temperature falls below the cooling
setpoint, the cooling valve shall be closed.
If the discharge air temperature falls below 55°F OR the low limit thermostat closes, the cooling valve shall be
driven closed. This valve shall remain closed until the discharge air temperature rises above 57°F AND the low
limit thermostat opens.
Heating Operation
When the space temperature falls below the heating setpoint, a proportional-integral control loop shall position
the heating valve to maintain the space temperature. When the space temperature exceeds the heating
setpoint, the heating valve shall be closed.
If the discharge air temperature exceeds 130°F, the heating valve shall be driven closed, regardless of other
conditions. This valve shall remain closed until the discharge air temperature falls below 110°F.
If the discharge air temperature falls below 55°F OR the low limit thermostat closes, the heating valve shall be
driven open. This valve shall remain open until the discharge air temperature rises above 57°F AND the low
limit thermostat opens.
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature.
The outdoor air damper shall be closed in low limit conditions (See Safeties).
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall be closed if the space temperature rises more than 3°F above the cooling
setpoint. The damper will not open until the space temperature falls to less than 2°F above the cooling
setpoint.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds 68°F.
The outdoor air damper shall be controlled with a proportional control loop based upon the deviation from
setpoint. The outdoor air damper shall begin to modulate open from minimum position when the space
temperature exceeds the (space setpoint - 0.5°F). The outdoor air damper shall be fully open when the space
temperature rises 1.5°F above the setpoint. Except as noted in the paragraphs above, the outdoor air damper
shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the low limit thermostat trips OR the discharge air temperature falls below 55°F, the unit enters low limit
mode. This shall drive both the outdoor air damper and the cooling valve closed. In heating mode, this shall
drive the heating valve open.
Normal unit operation shall resume when the discharge air temperature exceeds 57°F AND the low limit
thermostat opens.
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Part Number 011-200001-003
Page 12
E) Electric Heat Only
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
When the space temperature exceeds the cooling setpoint, the supply fan shall start (Unoccupied mode).
Heating Operation
There is a fixed 15-second delay between the engagement of each electric heat stage. Each electric heat
stage must be engaged for 1 minute (minimum ON timer) and each stage cannot be re-engaged for 1 minute
after being switched OFF (minimum OFF timer). These delays are built into the unit controller.
When the space temperature falls below the heating setpoint, electric heating shall be staged on to maintain
the space temperature. A proportional-integral control loop and built-in digital sequencer shall be used to
control up to 3 stages of electric heat. When the space temperature exceeds the heating setpoint, all electric
heat stages shall be staged OFF.
If the discharge air temperature exceeds 130°F, all electric heat stages shall be immediately disengaged,
regardless of the space temperature or the minimum ON timer. Electric heating shall remain disengaged until
the discharge air temperature falls below 110°F.
If the discharge air temperature falls below 55°F, all electric heat stages are immediately engaged. All electric
heat shall remain ON until the discharge air temperature rises above 57°F.
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature
conditions.
The outdoor air damper shall be closed if the discharge air temperature falls below 55°F and remain closed
until the discharge air rises above 57°F.
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds the space
cooling setpoint by more than 10°F. The damper shall remain at minimum position until the outdoor air
temperature drops to within 9°F of the cooling setpoint.
The outdoor air damper shall be controlled with a proportional control loop based upon the deviation from
setpoint. The outdoor air damper shall begin to modulate open from minimum position when the space
temperature exceeds the (space setpoint - 0.5°F). The outdoor air damper shall be fully open when the space
temperature rises 1.5°F above the setpoint. Except as noted in the paragraphs above, the outdoor air damper
shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the discharge air temperature exceeds 130°F, all electric heat stages shall be immediately disengaged,
regardless of other conditions. Electric heat shall remain locked out, until the discharge air temperature falls
below 110°F.
If the discharge air temperature falls below 55°F, all electric heat stages are immediately engaged. Normal unit
operation shall resume when the discharge air temperature exceeds 57°.
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F) DX cooling only
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
When the space temperature exceeds the cooling setpoint, the compressor shall be started. The compressor
shall run until the space temperature falls 0.5°F below the cooling setpoint. Compressor operation shall be
controlled with an integrated run timer such that once engaged, the compressor shall operate for a minimum of
2 minutes before disengaging. This run timer also provides a 3-minute minimum OFF time delay (anti shortcycle timer).
If the outdoor air temperature falls below 59°F, the compressor shall be disengaged when the minimum run
time of 2 minutes is complete. The compressor shall remain disengaged until the outdoor air temperature
exceeds 61°F AND the minimum off time of 3 minutes has elapsed.
If the discharge air temperature falls below 50°F OR the optional refrigerant low limit switch trips, the
compressor shall be immediately disengaged, regardless of the minimum run timer status. The compressor
shall remain disengaged until the low limit switch opens AND the discharge air temperature is above 52°F
AND the minimum off time of 3 minutes has elapsed.
Heating Operation
The supply fan shall be engaged when the space temperature falls below the heating setpoint (unoccupied
mode).
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature
conditions.
The outdoor air damper shall be closed if the discharge air temperature falls below 53°F and remain closed
until the discharge air rises above 55°F.
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds 68°F.
The outdoor air damper shall be controlled with a proportional control loop based upon the discharge air
temperature. The outdoor air damper shall begin to modulate open from minimum position when the discharge
air temperature exceeds 55°F and shall be fully open at 59°F. Except as noted in the paragraphs above, the
outdoor air damper shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the discharge air temperature falls below 53°F, the unit enters ventilation low limit mode. This shall drive the
outdoor air damper closed. This damper shall not open until the discharge air temperature exceeds 55°F.
If the discharge air temperature falls below 50°F, the unit enters refrigeration low limit mode. This shall
immediately disengage the compressor, regardless of the minimum on timer status. The compressor shall not
be allowed to operate until the discharge air temperature exceeds 52°F AND the minimum off time has
elapsed.
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G) DX Cooling with Electric Heat
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
When the space temperature exceeds the cooling setpoint, the compressor shall be started. The compressor
shall run until the space temperature falls 0.5°F below the cooling setpoint. Compressor operation shall be
controlled with an integrated run timer such that once engaged, the compressor shall operate for a minimum of
2 minutes before disengaging. This run timer also provides a 3-minute minimum OFF delay (anti short-cycle
timer).
If the outdoor air temperature falls below 59°F, the compressor shall be disengaged when the minimum run
time of 2 minutes is complete. The compressor shall remain disengaged until the outdoor air temperature
exceeds 62°F AND the minimum off time of 3 minutes has elapsed.
If the discharge air temperature falls below 52°F OR the optional refrigerant low limit switch trips OR electric
heat is engaged, the compressor shall be immediately disengaged, regardless of the minimum run timer
status. The compressor shall remain disengaged until the discharge air temperature rises above 52°F AND the
low limit switch opens AND electric heat is disengaged AND the minimum off time of 3 minutes has elapsed.
Heating Operation
There is a fixed 15-second delay between the engagement of each electric heat stage. Each electric heat
stage must be engaged for 1 minute (minimum ON timer) and each stage cannot be re-engaged for 1 minute
after being switched OFF (minimum OFF timer). These delays are built into the unit controller. Another built-in
timer prevents electric heat operation for 30 seconds after the compressor operation.
When the space temperature falls below the heating setpoint, electric heating shall be staged on to maintain
the space temperature. A proportional-integral control loop and built-in digital sequencer shall be used to
control up to 3 stages of electric heat. When the space temperature exceeds the heating setpoint, all electric
heat stages shall be staged OFF.
If the discharge air temperature exceeds 130°F, all electric heat stages shall be immediately disengaged,
regardless of the space temperature or the minimum ON timer. Electric heating shall remain disengaged until
the discharge air temperature falls below 110°F.
If the discharge air temperature falls below 52°F, all electric heat stages are immediately engaged, unless the
compressor is operating. All electric heat shall remain ON until the discharge air temperature rises above
55°F.
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature
conditions.
The outdoor air damper shall be closed if the discharge air temperature falls below 52°F and remain closed
until the discharge air rises above 55°F.
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds 68°F.
The outdoor air damper shall be controlled with a proportional control loop based upon the deviation from
setpoint. The outdoor air damper shall begin to modulate open from minimum position when the space
temperature exceeds the (space setpoint - 0.5°F). The outdoor air damper shall be fully open when the space
temperature rises 1.5°F above the setpoint. Except as noted in the paragraphs above, the outdoor air damper
shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the discharge air temperature falls below 52°F, the unit enters low limit mode. This shall drive the outdoor air
damper closed and immediately disengage the compressor. All stages of electric heat shall be staged on by
the integral timer; however, electric heat staging shall be delayed for 30 seconds if the compressor was in
operation. Normal unit operation shall resume when the discharge air temperature exceeds 55°F.
If the optional refrigerant low limit switch closes, the unit enters refrigeration low limit mode. This shall
immediately disengage the compressor, regardless of the minimum on timer status. The compressor shall not
be allowed to operate until the low limit switch opens AND the minimum off time (3 minutes) has elapsed.
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H) DX Cooling with Wet Heat, Damper Control
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
When the space temperature exceeds the cooling setpoint, the compressor shall be started and the face &
bypass damper driven fully open (face position). The compressor shall run until the space temperature falls
0.5°F below the cooling setpoint. Compressor operation shall be controlled with an integrated run timer such
that once engaged, the compressor shall operate for a minimum of 2 minutes before disengaging. This run
timer also provides a 3-minute minimum OFF time delay (anti short-cycle timer).
If the outdoor air temperature falls below 59°F, the compressor shall be disengaged when the minimum run
time of 2 minutes is complete. The compressor shall remain disengaged until the outdoor air temperature
exceeds 61°F AND the minimum off time of 3 minutes has elapsed.
If the heating coil low limit switch closes OR the optional refrigerant low limit switch closes, OR the discharge
air temperature falls below 50°F, the compressor shall be immediately disengaged, regardless of the minimum
run timer status. The compressor shall remain disengaged until the heating coil low limit switch is open AND
the optional refrigerant low limit switch is open AND the discharge air temperature is above 52°F AND the
minimum off time of 3 minutes has elapsed.
Heating Operation
When the space temperature falls below the heating setpoint, a proportional-integral control loop shall position
the face and bypass damper to maintain the space temperature. When the space temperature exceeds the
heating setpoint, the face and bypass damper shall close (bypass).
If the discharge air temperature fall below 53°F, OR the heating coil low limit thermostat closes, the face and
bypass damper shall drive open (face). This damper shall return to normal control when the discharge air
temperature exceeds 55°F AND the low limit thermostat is opened.
Optional End-of-Cycle Valve Operation
A normally open, 2-position valve with return on power failure is optionally used for end-of-cycle (EOC) control.
When the space temperature falls below the heating setpoint, the EOC valve shall open. The EOC valve shall
remain open until the space temperature exceeds the heating setpoint by 2°F.
When the outdoor air temperature falls below 40°F or the heating coil low limit switch closes, the EOC valve
shall open, regardless of space conditions. This valve shall remain open until the outdoor air temperature rises
above 44°F AND the heating coil low limit switch is open.
If the discharge air temperature exceeds 130°F, the EOC valve shall be closed, regardless of other conditions.
The EOC valve shall remain closed until the discharge air temperature falls below 110°F.
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature
conditions.
The outdoor air damper shall be closed if the discharge air temperature falls below 53° OR the heating coil low
limit thermostat closes. This damper shall remain closed until the discharge air temperature rises above 55°F
AND the heating coil low limit thermostat is open.
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds 68°F OR
the room temperature falls more than below the heating setpoint.
The outdoor air damper shall be controlled with a proportional control loop based upon the discharge air
temperature. The outdoor air damper shall begin to modulate open from minimum position when the discharge
air temperature exceeds 55°F and shall be fully open at 59°F. Except as noted in the paragraphs above, the
outdoor air damper shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the discharge air temperature falls below 53°F OR the heating coil low limit thermostat closes, the unit enters
ventilation low limit mode. This shall drive the outdoor air damper closed and forces the face and bypass
damper fully open (face). These dampers shall return to normal control when the discharge air temperature
exceeds 55°F AND the heating coil low limit thermostat is open.
If the discharge air temperature falls below 50°F OR the heating coil low limit thermostat closes OR the
optional refrigerant low limit switch closes, the unit enters refrigeration low limit mode. This shall immediately
disengage the compressor, regardless of the minimum on timer status. The compressor shall not be allowed to
operate until the discharge air temperature exceeds 52°F AND the heating coil low limit thermostat is open
AND the optional refrigerant low limit switch is open AND the minimum off time has elapsed.
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Part Number 011-200001-003
Page 16
I) DX Cooling with Wet Heat, Valve Control
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
When the space temperature exceeds the cooling setpoint, the compressor shall be started. The compressor
shall run until the space temperature falls 0.5°F below the cooling setpoint. Compressor operation shall be
controlled with an integrated run timer such that once engaged, the compressor shall operate for a minimum of
2 minutes before disengaging. This run timer also provides a 3-minute minimum OFF time delay (anti shortcycle timer).
If the outdoor air temperature falls below 59°F, the compressor shall be disengaged when the minimum run
time of 2 minutes is complete. The compressor shall remain disengaged until the outdoor air temperature
exceeds 61°F AND the minimum off time of 3 minutes has elapsed.
If the heating coil low limit switch closes OR the optional refrigerant low limit switch closes, the compressor
shall be immediately disengaged, regardless of the minimum run timer status. The compressor shall remain
disengaged until the heating coil low limit switch is open AND the optional refrigerant low limit switch is open
AND the minimum off time of 3 minutes has elapsed.
Heating Operation
When the space temperature falls below the heating setpoint, a proportional-integral control loop shall position
the heating valve to maintain the space temperature. When the space temperature exceeds the heating
setpoint, the heating valve shall be closed.
If the discharge air temperature exceeds 130°F, the heating valve shall be driven closed, regardless of other
conditions. This valve shall remain closed until the discharge air temperature falls below 110°F.
In heating mode, if the discharge air temperature falls below 53°F OR the heating coil low limit thermostat
closes, the heating valve shall be driven open. This valve shall remain open until the discharge air temperature
rises above 55°F AND the low limit thermostat opens.
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature
conditions.
The outdoor air damper shall be closed if the discharge air temperature falls below 53°F AND the space
temperature is below the cooling setpoint. This damper shall remain closed until the discharge air temperature
rises above 55°F.
The outdoor air damper shall be closed when the heating coil low limit thermostat closes. This damper shall
remain closed until the low limit thermostat opens.
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds 68°F.
The outdoor air damper shall be controlled with a proportional control loop based upon the discharge air
temperature. The outdoor air damper shall begin to modulate open from minimum position when the discharge
air temperature exceeds 55°F and shall be fully open at 59°F. Except as noted in the paragraphs above, the
outdoor air damper shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the discharge air temperature falls below 53°F with the space temperature below the cooling setpoint OR the
heating coil low limit thermostat closes, the unit enters ventilation low limit mode. This shall drive the outdoor
air damper closed. This damper shall not open until the discharge air temperature exceeds 55°F AND the
heating coil low limit thermostat is open.
If the discharge air temperature falls below 50°F OR the heating coil low limit thermostat closes, the unit enters
refrigeration low limit mode. This shall immediately disengage the compressor, regardless of the minimum on
timer status. The compressor shall not be allowed to operate until the discharge air temperature exceeds 52°F
AND the heating coil low limit thermostat opens AND the minimum off time has elapsed.
7/1/03
Part Number 011-200001-003
Page 17
J) Damper Controlled Chilled Water Cooling with Electric Heat
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
When the space temperature exceeds the cooling setpoint, a proportional-integral control loop shall position
the face & bypass damper to maintain the space temperature. When the space temperature falls below the
cooling setpoint, the face & bypass damper shall close (bypass).
The face and bypass damper shall be driven closed (full bypass) if the discharge air temperature falls below
55°F OR the low limit thermostat closes. The damper shall remain closed until the discharge air temperature
exceeds 57°F AND the low limit thermostat opens.
Heating Operation
There is a fixed 15-second delay between the engagement of each electric heat stage. Each electric heat
stage must be engaged for 1 minute (minimum ON timer) and each stage cannot be re-engaged for 1 minute
after being switched OFF (minimum OFF timer). These delays are built into the unit controller.
When the space temperature falls below the heating setpoint, electric heating shall be staged on to maintain
the space temperature. The face & bypass damper shall fully open (face) when an electric heat stage is
engaged. A proportional-integral control loop and built-in digital sequencer shall be used to control up to 3
stages of electric heat. When the space temperature exceeds the heating setpoint, all electric heat stages
shall be staged OFF.
If the discharge air temperature falls below 52°F, all electric heat stages are immediately. All electric heat shall
remain ON until the discharge air temperature rises above 55°F.
If the discharge air temperature exceeds 130°F, all electric heat stages shall be immediately disengaged,
regardless of the space temperature or the minimum ON timer. Electric heating shall remain disengaged until
the discharge air temperature falls below 110°F.
End-of-Cycle Valve Operation (Optional)
A normally closed, 2-position valve with return on power failure is optionally used as a cooling end-of-cycle
(EOC) valve. This valve prevents radiant effects from overcooling the space when the face & bypass damper
is in the full bypass position. The EOC valve shall open when the face & bypass damper is commanded to
open.
The EOC valve shall be closed whenever the discharge air temperature falls below 55°F OR the coil low limit
thermostat closes. The valve shall remain closed until the discharge air temperature exceeds 57°F AND the
low limit thermostat opens.
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature
conditions.
The outdoor air damper shall be closed in low limit conditions (See Safeties).
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall be closed if the space temperature rises more than 3°F above the cooling
setpoint. The damper will not open until the space temperature falls within 2°F of the cooling setpoint.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds 68°F
The outdoor air damper shall be controlled with a proportional control loop based upon the deviation from
setpoint. The outdoor air damper shall begin to modulate open from minimum position when the space
temperature exceeds the (space setpoint - 0.5°F). The outdoor air damper shall be fully open when the space
temperature rises 1.5°F above the setpoint. Except as noted in the paragraphs above, the outdoor air damper
shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the low limit thermostat trips OR the discharge air temperature falls below 55°F, the unit enters low limit
mode. This shall drive the outdoor air damper closed. In cooling mode, this shall force the face & bypass
damper into full bypass position and the optional EOC valve shall close. If the discharge air temperature falls
below 52°F, the all stages of electric heat shall be engaged.
Electric heat shall return to normal control when the discharge air temperature exceeds 55°F.Normal unit
operation shall resume when the discharge air temperature exceeds 57°F and the low limit thermostat opens.
7/1/03
Part Number 011-200001-003
Page 18
K) Valve Controlled Chilled Water Cooling with Electric Heat
Fan Operation
The supply fan shall run continuously in the occupied and tenant (unoccupied) override modes. The fan shall
cycle with calls for cooling or heating in the unoccupied mode.
Cooling Operation
When the space temperature exceeds the cooling setpoint, a proportional-integral control loop shall position
the control valve to maintain the space temperature. When the space temperature falls below the cooling
setpoint, the control valve shall be closed.
The chilled water valve shall be driven closed when the discharge air temperature falls below 55°F OR the coil
low limit thermostat closes. The valve shall remain closed until the discharge air temperature exceeds 57°F
AND the coil low limit thermostat opens.
Heating Operation
There is a fixed 15-second delay between the engagement of each electric heat stage. Each electric heat
stage must be engaged for 1 minute (minimum ON timer) and each stage cannot be re-engaged for 1 minute
after being switched OFF (minimum OFF timer). These delays are built into the unit controller.
When the space temperature falls below the heating setpoint, electric heating shall be staged on to maintain
the space temperature. A proportional-integral control loop and built-in digital sequencer shall be used to
control up to 3 stages of electric heat. When the space temperature exceeds the heating setpoint, all electric
heat stages shall be staged OFF.
All electric heat stages shall be immediately engaged when the discharge air temperature falls below 52°F.
Electric heat shall remain engaged until the discharge air temperature rises above 55°F.
If the discharge air temperature exceeds 130°F, all electric heat stages shall be immediately disengaged,
regardless of the space temperature or the minimum ON timer. Electric heating shall remain disengaged until
the discharge air temperature falls below 110°F.
Outdoor Air Damper Control
The outdoor air damper shall be closed in the unoccupied mode, regardless of the space temperature
conditions.
The outdoor air damper shall be closed in low limit conditions (See Safeties).
The outdoor air damper shall be closed if the space temperature falls more than 3°F below the heating
setpoint. The damper will not open until the space temperature rises within 2°F of the heating setpoint.
The outdoor air damper shall be closed if the space temperature rises more than 3°F above the cooling
setpoint. The damper will not open until the space temperature falls within 2°F of the cooling setpoint.
The outdoor air damper shall close to minimum position when the outdoor air temperature exceeds 68°F
The outdoor air damper shall be controlled with a proportional control loop based upon the deviation from
setpoint. The outdoor air damper shall begin to modulate open from minimum position when the space
temperature exceeds the (space setpoint - 0.5°F). The outdoor air damper shall be fully open when the space
temperature rises 1.5°F above the setpoint. Except as noted in the paragraphs above, the outdoor air damper
shall not close beyond minimum position during occupied operation.
Safeties - Low Limit Conditions
If the low limit thermostat trips OR the discharge air temperature falls below 55°F, the unit enters low limit
mode. This shall drive the outdoor air damper closed. In cooling mode, this shall force the cooling valve
closed. If the discharge air temperature falls below 52°F, all stages of electric heat shall be engaged.
Electric heat shall return to normal control when the discharge air temperature exceeds 55°F.Normal unit
operation shall resume when the discharge air temperature exceeds 57°F AND the low limit thermostat opens.
7/1/03
Part Number 011-200001-003
Page 19
7) Typical Unit Wiring
A) Control Diagram, 2-pipe Damper Control
2
BLU
OAT
VIO
DAT
BLU
VIO
ORN
BRN
ORN
7
C/O SW
RED
2
VIO/2
1
YEL
3
BLK
BLU
LL
(Optional)
COM
AO1
DI2
CBC3
RED
24H
24G
GND
C1
NO1
C2
NO2
C3
NO3
COM
DI1
S-LK
S-LK
C4
NO4
C5
NO5
LON
LON
C6
NO6
V1C
OUTDOOR
AIR DAMPER
FACE & BYPASS
DAMPER
(Optional)
T1
4-20 +
0-10V+
T2
-
RED
ORN
5
6
BRN
RED
24 V
WHT
4-20mA
BRN
Fdbck
BLK
COM
RED
ORN
BLU
VIO
RED
ORN
YEL
BLK
GRA
YEL
BLK
GRA
BRN
WHT
BLK
V2C
1
2
3
4
FROM CONTROL BOX
6
7
8
9
10
11
12
3
4
5
RED
WHT
BLK
BRN
24 V (hot)
1
FR-Coil
24 V (gnd)
2
3
4
5
6
7
8
9
4
C1 (MN-04)
C2 (MN-06)
NO2 (MN-07)
C3 (MN-08)
NO3 (MN-09)
C4 (MN-10)
NO4 (MN-11)
C5 (MN-12)
NO5 (MN-13)
C6 (MN-14)
VIO
RED
BLK
BRN
YEL
WHT
VIO
BRN
YEL
WHT
VIO
BLU
ORN
GRA
BLU
ORN
GRA
HR1
(Optional)
NO6 (MN-15)
AO2 (MN-21)
FB ACTUATOR
4-20 Ma
COM1
24VAC
COM2
AO1 (MN-23)
OA ACTUATOR
WHT
BLK
RED
CBC2
5
Optional Day/Night Relay
Coil is Field Connected
TC1
See
Note 3
S-Link
1
OR
3
2
4
See Note1
LON
DI1 (MN-26)
MN-S4
COM (MN-25)
Optional Day/Night Relay
See Note1
Optional Time Clock
BRN
3
2
5
TC1
1
RED
DI2 (MN-24)
COM (MN-25)
Dual-Mount
Unit Sensor
MN-S4
S-LK
S-LK
5
6
7
8
9
Part Number 011-200001-003
S-LK(MN-28)
OAT
UI3 (MN-20)
1
2
3
4
Optional
C/O Switch
ORN
CBC3
RED
BLK
FR1
NO1 (MN-05)
S-LK(MN-27)
CBC1
7/1/03
3
4
5
OAC
1
2
YEL
2
(COM)
7
MN RELAY OUTPUTS
Optional Time Clock
1
2
ORN
4
BLK
3
Ladder Logic
(24V)
8
CBC2
BLU/1
VIO/2
ORN/3
BRN
BLK
EOC
RED
BLU
VIO
BRN
BRN
BLK
1
2
3
BRN
GRN
1
RED
BLU/1
WHT
RED
BLU
ORN
YEL
R
WHT
11
UI2
COM
UI3
AO2
I/A SERIES
1
ORN/3
UI1
COM
BLU
MN 200
RAT
CBC2
COM (MN-19)
3
NOTES
1: Time Clock and Day/Night Relay Contacts are:
OPEN for Occupied Mode
CLOSED for Unoccupied Mode.
Holiday switch is built into factory mounted time clock.
3: Wall T'stat LON terminals are not factory connected.
These may be field connected and these terminals
are not polarity sensitive.
4: End of Cycle Valve (EOC) spring returns to the
Normally Open position. Output NO6 applies
24VAC to close the valve.
LL
2
1
RAT
UI1 (MN-16)
DAT
COM (MN-17)
UI2 (MN-18)
Page 20
B) Control Diagram, 2-pipe Valve Control
DAT
OAT
11
COM
AO1
C/O SW
LL
ORN/3
BLU/1
3
BLK
BLU
2
VIO/2
(Optional)
1
R
7
COM
UI3
AO2
2
I/A SERIES
UI1
COM
UI2
RAT
1
MN 200
C)
CBC2
Ladder Logic
CBC3
24H
24G
GND
C1
NO1
C2
NO2
C3
DI2
COM
NO3
C4
DI1
S-LK
S-LK
NO4
C5
NO5
LON
LON
C6
NO6
1
(24V)
(COM)
MN RELAY OUTPUTS
GRN
3
2
4
C1 (MN-04)
NO1 (MN-05)
C2 (MN-06)
NO2 (MN-07)
C3 (MN-08)
NO3 (MN-09)
C4 (MN-10)
NO4 (MN-11)
C5 (MN-12)
NO5 (MN-13)
C6 (MN-14)
NO6 (MN-15)
AO2 (MN-21)
2
3
4
RED
BLU
VIO
BRN
Controlling
Valve
V2C
24 V
1
4-20mA
2
3
4
5
6
COM
CBC2
BLU/1
VIO/2
ORN/3
BLU
VIO
RED
ORN
YEL
RED
ORN
YEL
BLK
GRA
BRN
BLK
GRA
WHT
BLK
5
6
DI1 (MN-26)
See
Note 3
COM (MN-25)
S-Link
LON
Optional C/O Switch
MN-S4
DI2 (MN-24)
COM (MN-25)
7
8
9
10
11
12
OA ACTUATOR
4-20 mA
COM
Optional Occupancy Control
See Note1
1
2
3
4
CONTROLLING VALVE
4-20 mA
COM
24 VAC
V1C
1
HR1
(Optional)
24 VAC
AO1 (MN-23)
Optional
Occupancy Input
FR1
Dual-Mount
Unit Sensor
S-LK(MN-27)
MN-S4
S-LK
S-LK
S-LK(MN-28)
OUTDOOR
AIR DAMPER
OAC
24 V
4-20mA
1
2
3
COM
4
5
RED
WHT
BLK
BRN
OAT
UI3 (MN-20)
3
FROM CONTROL BOX
7/1/03
24 V (gnd)
1
2
3
4
5
6
7
8
9
2
1
CBC3
CBC1
24 V (hot)
FR-Coil
COM (MN-19)
LL
RED
BLK
BRN
YEL
RED
BLK
BRN
YEL
WHT
VIO
BLU
WHT
VIO
BLU
ORN
GRA
ORN
GRA
1
2
3
4
5
6
7
8
9
Part Number 011-200001-003
RAT
NOTES
UI1 (MN-16)
DAT
COM (MN-17)
UI2 (MN-18)
1: Timeclock, Day/Night Relay & Pneu. SW Contacts are:
OPEN for Occupied Mode
CLOSED for Unoccupied Mode.
Holiday switch is built into factory mounted time clock.
2: Water valve actuator must be configured for 4-20 mA
operation.
3: Wall T'stat LON terminals are not factory connected.
These may be field connected and these terminals are
not polarity sensitive.
Page 21
C) Control Diagram, 4-pipe, Damper Control
Ladder Logic
CBC2
6
(24V)
(COM)
MN RELAY OUTPUTS
OAT
DAT
7
11
LL
ORN/3
BLU/1
3
2
Optional
Occupancy Input
VIO/2
COM
DI1
S-LK
S-LK
LON
LON
1
See Note1
See Note 4
CW
EOC
V1C
1
2
HW
EOC
3
4
See Note 5
RED
BLU
VIO
BRN
Face/Bypass
DAMPER
V2C
1
2
3
4
24 V
4-20mA
COM
5
6
RED
ORN
YEL
BLK
GRA
BRN
R
UI2
COM
UI3
AO2
COM
AO1
DI2
2
I/A SERIES
RAT
1
MN 200
UI1
COM
CBC3
24H
24G
GND
C1
NO1
C2
NO2
C3
NO3
C4
NO4
C5
NO5
C6
NO6
1
GRN
3
2
C1 (MN-04)
NO1 (MN-05)
C2 (MN-06)
NO2 (MN-07)
C3 (MN-08)
NO3 (MN-09)
C4 (MN-10)
NO4 (MN-11)
C5 (MN-12)
NO5 (MN-13)
C6 (MN-14)
NO6 (MN-15)
CBC2
4
VIO
RED
ORN
YEL
BLK
GRA
WHT
BLK
10
11
12
HT EOC
AO1 (MN-23)
4-20 mA
24 VAC
COM
OA ACTUATOR
4-20 mA
COM
24 VAC
5
Optional Occupancy Control
1
2
3
4
5
6
7
8
9
CW EOC
FB ACTUATOR
AO2 (MN-21)
CBC2
BLU/1
VIO/2
ORN/3
BLU
FR1
DI1 (MN-26)
COM (MN-25)
See
Note 3
S-Link
LON
MN-S4
S-LK(MN-27)
MN-S4
S-LK
S-LK
S-LK(MN-28)
OUTDOOR
AIR DAMPER
OAC
24 V
4-20mA
1
2
COM
3
4
5
RED
WHT
BLK
BRN
Dual-Mount
Unit Sensor
FROM CONTROL BOX
7/1/03
FR-Coil
24 V (gnd)
1
2
3
4
5
6
7
8
9
COM (MN-19)
3
CBC3
CBC1
24 V (hot)
OAT
UI3 (MN-20)
RED
BLK
BRN
YEL
WHT
RED
BLK
BRN
YEL
WHT
VIO
BLU
ORN
GRA
VIO
BLU
ORN
GRA
1
2
3
4
5
6
7
8
9
Part Number 011-200001-003
LL
2
1
NOTES
1: Time Clock and Day/Night Relay Contacts are:
OPEN for Occupied Mode
CLOSED for Unoccupied Mode.
Holiday switch is built into factory mounted time clock.
3: Wall T'stat LON terminals are not factory connected.
These may be field connected and these terminals
are not polarity sensitive.
4: Heating End of Cycle Valve (EOC) spring returns to
the Normally Open position. Output NO6 applies
24VAC to close the valve.
5: Cooling EOC Valve spring returns to the Normally
Closed position. Output NO5 applies 24 VAC to
open this valve.
RAT
UI1 (MN-16)
DAT
COM (MN-17)
UI2 (MN-18)
Page 22
D) Control Diagram, 4-pipe, Valve Control
CBC2
RED
2
7
BLU
OAT
VIO
DAT
BLU
VIO
ORN
ORN
WHT
BRN
WHT
LL
ORN/3
1
2
ORN
VIO/2
YEL
Cooling VLV
RED
G0
BRN
G
BLU (OPN)
Y1
VIO (CLS)
Y2
1
ORN
2
3
499 OHM
4
OUTDOOR
AIR DAMPER
BLU/1
VIO
BRN
VIO/2
ORN/3
BLU
RED
VIO
RED
ORN
YEL
ORN
YEL
BLK
BLK
5
6
BRN
GRA
BRN
GRA
WHT
4-20mA
RED
BLK
1
2
WHT
3
4
5
FROM CONTROL BOX
24 V (gnd)
2
3
4
5
6
7
8
9
7/1/03
4
5
6
1
7
8
10
11
12
OR
AO1
DI2
COM
DI1
3
Ladder Logic
(24V)
8
NO1 (MN-05)
NO2 (MN-07)
C3 (MN-08)
NO3 (MN-09)
NO2
C4 (MN-10)
NO4 (MN-11)
C3
NO3
C5 (MN-12)
NO5 (MN-13)
BLK
NO1
C2
C4
NO4
S-LK
C5
S-LK
LON
NO5
C6
LON
NO6
2
C6 (MN-14)
BLU
VIO
4
AO2 (MN-21)
2
TC1
1
4-20 Ma
COM1
COM (MN-22)
24VAC
5
OA ACTUATOR
AO1 (MN-23)
WHT
BLK
RED
Optional Time Clock
See
Note 3
S-Link
DI1 (MN-26)
COM (MN-25)
MN-S4
Optional Holiday Switch
or Day/Night Relay
MN-S4
Optional Time Clock
5
CW OPEN
CW CLOSE
HOT WATER VALVE
4
3
FR1
NO6 (MN-15)
CBC2
See Note1
BRN
(COM)
7
MN RELAY OUTPUTS
C2 (MN-06)
LON
3
2
9
RED
WHT
S-LK(MN-27)
ORN
RED
Dual-Mount
Unit Sensor
S-LK
S-LK
S-LK(MN-28)
OAT
UI3 (MN-20)
COM (MN-19)
3
LL
2
1
BLK
BRN
RAT
CBC3
CBC1
1
Optional Day/Night Relay
Coil is Field Connected
2
3
OAC
BRN
Fdbck
BLK
COM
24 V (hot)
FR-Coil
1
BRN
RED
24 V
COM
1
C1 (MN-04)
GRN
GND
C1
CBC2
ORN
3
4
RED
BLU
BRN
1
2
V2C
G
UI3
AO2
CBC3
RED
BRN
24G
V1C
Heating VLV
G0
Y
UI2
COM
24H
RED
YEL
BLU/1
3
COM
R
11
BLU
I/A SERIES
1
UI1
MN 200
RAT
RED
6
RED
BLK
RED
BLK
BRN
BRN
YEL
WHT
YEL
WHT
VIO
VIO
BLU
ORN
BLU
ORN
GRA
GRA
UI1 (MN-16)
1
DAT
COM (MN-17)
UI2 (MN-18)
2
3
4
5
6
7
8
9
Part Number 011-200001-003
NOTES
1: Time Clock and Day/Night Relay Contacts are:
OPEN for Occupied Mode
CLOSED for Unoccupied Mode.
Holiday switch is built into factory mounted time clock.
3: Wall T'stat LON terminals are not factory connected.
These may be field connected and these terminals are
not polarity sensitive.
Page 23
E) Control Diagram, DX with Electric Heat
Ladder Logic
DAT
CBC2
11
V1C
1
2
3
4
SEE POWER
DIAGRAM FOR
ELECTRIC HEAT
WIRING DETAIL.
V2C
1
2
3
4
5
6
(HR3)
(HR1)
(HR2)
OUTDOOR
AIR DAMPER
OAC
24 V
4-20mA
1
2
COM
3
4
5
RED
BLU
VIO
BRN
RED
ORN
YEL
BLK
GRA
BRN
CBC2
BLU/1
VIO/2
ORN/3
BLU
VIO
RED
ORN
YEL
BLK
GRA
WHT
BLK
FROM CONTROL BOX
DX-Coil
1
2
3
4
5
6
7
8
9
S-LK
S-LK
LON
LON
See Note1
7
8
9
10
11
12
24H
24G
GND
C1
NO1
C2
NO2
C3
NO3
C4
NO4
C5
NO5
C6
NO6
1
GRN
3
2
CBC2
9
10
(24V)
C1 (MN-04)
NO1 (MN-05)
C2 (MN-06)
NO2 (MN-07)
C3 (MN-08)
NO3 (MN-09)
C4 (MN-10)
NO4 (MN-11)
C5 (MN-12)
NO5 (MN-13)
C6 (MN-14)
NO6 (MN-15)
8
CBC3
(COM)
MN RELAY OUTPUTS
AO1 (MN-23)
7
FR1
HR1
HR2
HR3
DX1
OA ACTUATOR
4-20 mA
COM
24 VAC
Optional Occupancy Control
DI1 (MN-26)
COM (MN-25)
S-Link
LON
MN-S4
RED
WHT
BLK
BRN
CBC1
24 V (hot)
FR-Coil
24 V (gnd)
1
2
3
4
5
6
Optional
Occupancy Input
R
COM
UI3
AO2
COM
AO1
DI2
COM
DI1
OAT
I/A SERIES
UI1
COM
UI2
MN 200
RAT
CBC3
CBC3
RED
BLK
BRN
YEL
WHT
VIO
BLU
ORN
RED
BLK
BRN
YEL
WHT
VIO
BLU
ORN
GRA
GRA
Dual-Mount
Unit Sensor
S-LK(MN-27)
MN-S4
S-LK
S-LK
S-LK(MN-28)
1
2
3
4
5
6
7
8
9
OAT
UI3 (MN-20)
COM (MN-19)
RAT
UI1 (MN-16)
DAT
COM (MN-17)
UI2 (MN-18)
NOTES
1: Time Clock and Day/Night Relay Contacts are:
OPEN for Occupied Mode
CLOSED for Unoccupied Mode.
Holiday switch is built into factory mounted time clock.
3: Wall T'stat LON terminals are not factory connected. These may be field
connected and these terminals are not polarity sensitive.
7/1/03
Part Number 011-200001-003
Page 24
DISC1
L1
FR1
115/265 V
1
3
FR1
2
1
N
3
GND
3
To Remote
Condenser
7
1
MAX
HIGH
TRAN3
4
24VAC
3
To Remote
Condenser
DX1
2
3 WIRE
POWER
CABLE
FAN
MOTOR
LOW
3
SPEED BOARD
LOW
24Vac
MED
5
11
14
SW2
5
HIGH
FR1
1
2
3
FU2
GND
3
DX1
MAX
TRAN3
4
DX1
1
7
208/230 V
L2
SEE UNIT WIRING DIAGRAM
TRAN1 FOR TRAN1 WIRING DETAIL.
3
FR1
GND
To Remote
Condenser
DX1
2
SEE UNIT WIRING DIAGRAM
FOR TRAN3 WIRING DETAIL.
2
1
3
DX1
7
1
EC FAN
MOTOR
1
4
3
SPEED BOARD
LOW
24Vac
MED
5
11
HIGH
FAN
MOTOR
1
3
SW2
HIGH
LOW
CBC1
FU2
2
3
SW1
FU1
FR1
4
FR1
9
5 PIN
RECEPTACLE
ON MOTOR
4
CBC1
1
24VAC
2
2
LOW
24VAC
L1
TRAN1
208/230 V
16 PIN
RECEPTACLE
ON MOTOR
3
SEE CONTROL DIAGRAM
FOR HARNESS WIRING
SW1
FU1
12
MAX
4
SEE UNIT WIRING DIAGRAM
FOR TRAN1 WIRING DETAIL.
2
7
1
MAX
DISC1
To Remote
Condenser
DX1
SW2
1
L2
3
1
4
2
DISC1
2
1
N
GND
SEE UNIT WIRING DIAGRAM
FOR TRAN3 WIRING DETAIL.
L1
FR1
HIGH
DX1
2
DX1
3
12
MAX
3 WIRE
POWER
CABLE
SEE CONTROL DIAGRAM
FOR HARNESS WIRING
4
115/265 V
2
2
1
FR1
TRAN1
FU1
CBC1
TRAN1
4
CBC1
SEE CONTROL DIAGRAM
FOR HARNESS WIRING
L1
SW1
24VAC
DISC1
SW1
FU1
SEE CONTROL DIAGRAM
FOR HARNESS WIRING
F) Typical Power Diagrams
16 PIN
RECEPTACLE
ON MOTOR
14
5
SW2
MAX
HIGH
4
LOW
2
9
EC FAN
MOTOR
3
2
1
7/1/03
Part Number 011-200001-003
5 PIN
RECEPTACLE
ON MOTOR
Page 25
8) Parts List
A) Standard Control Parts
24H
24G
GND
C1
NO1
C2
NO2
C3
NO3
C4
NO4
C5
NO5
C6
NO6
1
I/A SERIES
2
R
MN 200
Program ID Label
UI1
COM
UI2
COM
UI3
AO2
COM
AO1
DI2
COM
DI1
S-LK
S-LK
LON
LON
PGM: RC2CIINTr0
SO: 1000000
3
°F
73.9 °C%
4
AUTO
I
5
0
6
Figure 4
Ref.
1
2
3
4
5
6
Not shown
Not shown
Not shown
Description
Connection Jumper Comb
MNL200 Unit Controller
MN-S4 Dual Mount Thermostat
Day/Night Relay
24V, 7Day Timeclock
Discharge, Room, or Outdoor
Air Temperature Sensor
Fan Relay
Outdoor Air Damper Actuator
Face & Bypass Damper
Actuator
P/N
UV0427
UV0391
UV0395
112000
UV0400
UV0401
112000
103209
103208
B) Instructions for Ordering Replacement Controllers
When ordering a replacement controller, it is necessary to provide information to determine which
control program must be loaded into the controller. The factory can determine which program is needed
from the complete unit model number and serial number; however, for quickest service, please provide
the control program name (PGM) and original sales order (SO) number listed on the program ID label of
the original unit controller. See figure 4 for the location of this label.
7/1/03
Part Number 011-200001-003
Page 26
9) Troubleshooting Chart
Symptom
Check
Unit in Occupied Mode?
Unit in Unoccupied Mode?
Discharge Air Temp. Input
Fan Runs
Continuously
Space Temp & Setpoints
Sensor Values & Locations
Controller NO1 Output
Fan Relay
Unit in Unoccupied Mode?
Wall 'stat Fan Icon OFF?
Wall 'stat Fan Icon ON?
Fan Won't Run
Controller NO1 Output
Fan Relay
Fan Motor
Discharge Air Temp. Input
Space Too Warm
(Heat Mode)
Sensor Values & Locations
Water Coil Low Limit Switch
Outdoor Air Temp. Input
Heating Valve
Heating Control Relay
(Electric Heat)
Discharge Air Temp. Input
Space Too Warm
(Cool Mode)
Sensor Values & Locations
Water Coil Low Limit Switch
Outdoor Air Temp. Input
Changeover (Aquastat)
Refrigerant Low Limit (Optional)
Cooling/Heating Valve(s)
Adequate Cooling Capacity
Room Air Sensor
Space Too Cool
(Cool Mode)
Sensor Values & Locations
Cooling Valve Operation
Discharge Air Temp Input
Space Too Cool
(Heat Mode)
Outdoor Air
Damper Won't
Close
Sensor Values & Locations
Cooling/Heating Valve(s)
Adequate Heating Capacity
Unit in Occupied Mode?
Damper Actuator
Unit in Occupied Mode?
Discharge Air Temp. Input
Outdoor Air
Damper Won't
Open
Water Coil Low Limit Switch
Outdoor Air Temp. Input
Space Temperature Input
Explanation
Fan runs continuously in Occupied and Tenant Override Modes.
Shut down is delayed 1 minute on transition to unoccupied mode.
Fan is forced on when DAT exceeds 130°F or when DAT falls below DAT low limit setpoint. Fan is
locked-on until DAT is between the low limit setpoint and 110°F. The fan is also engaged if the DAT
sensor fails.
Fan operates with call for cooling or heating. If a conditioning mode is NOT available, the unit will run
the fan. For example, on a heating only unit, the supply fan will be engaged when the space
temperature exceeds the unoccupied cooling setpoint.
Verify that the room, outdoor, and discharge air temperature sensors are installed in the correct
locations and that they are operating normally.
NO1 is energized (24 VAC) with a call for the fan.
NO1 energizes the fan relay. Check the wiring and relay contacts.
The fan operates only with calls for heating or cooling.
If the fan icon is not ON, the controller is not calling for the fan. Check the setpoints, space
conditions, and occupancy modes.
If the fan icon is ON, the controller has engaged the fan output.
If the fan icon is ON, 24 VAC should be on the NO1 terminal. If no voltage is present, Make sure that
there is continuity between the controller NO1 pin and the subbase.
Verify that the fan relay coil is connected to NO1 and neutral. When the controller engages the fan, a
nominal 24V is applied across the coil of the fan relay. Check the fan motor wiring and relay contacts.
Refer to the unit wiring diagram; check the fan motor wiring.
When the DAT falls below the DAT low limit setpoint or the DAT sensor fails, heat is engaged. Where
applicable:
Heating Valve is Opened.
Electric Heat is Engaged.
Face & Bypass damper driven to full face position.
Outdoor air damper is closed.
Verify that the room, outdoor, and discharge air temperature sensors are installed in the correct
locations and that they are operating normally.
When the water coil low limit switch trips, it shorts the OAT sensor input to signal the low limit
condition. If the switch trips or the OAT sensor fails, heat is engaged as described above.
Check the heating valve operation - HEATING VALVE MUST BE PIPED FOR NORMALLY OPEN
OPERATION.
Refer to the unit wiring diagram. Check for a stuck contact on the electric heat control relays.
When the DAT falls below the DAT low limit setpoint or the DAT sensor fails, cooling is disabled.
Where applicable:
Cooling Valve is Closed.
Face & Bypass damper driven to full bypass position.
Compressor is disabled.
Outdoor air damper is closed.
Verify that the room, outdoor, and discharge air temperature sensors are installed in the correct
locations and that they are operating normally.
When the water coil low limit switch trips, it shorts the OAT sensor input to signal the low limit
condition. If the switch trips or the OAT sensor fails, the outdoor air damper is closed.
On 2-pipe cooling and heating units the changeover switch closes when the water supply falls below
63°F. Is this switch installed so that it properly detects the supply water temperature?
Compressor operation is disabled when the RLL switch closes.
Does the cooling valve open? Is the heating valve closed?
Is chilled water available at correct temperature and flow rate? Is compressor operation disabled?
Check the location and operation of the room (return) air temperature (RAT) sensor or the wall 'stat.
The RAT must be disconnected when the wall 'stat is mounted in the space and used to detect space
temperature.
Verify that the room, outdoor, and discharge air temperature sensors are installed in the correct
locations and that they are operating normally.
Verify cooling valve operation.
Heating is disabled when the DAT input exceeds 130°F or the DAT sensor fails. Heating remains
disabled until the DAT falls below 110°F.
Verify that the room, outdoor, and discharge air temperature sensors are installed in the correct
locations and that they are operating normally.
Does the heating valve open? Is the cooling valve closed?
Is hot water/steam available at correct temperature and flow rate?
Outdoor air damper will open to minimum position in occupied mode and tenant override modes.
Measure the control signal to the actuator. The actuator will drive fully closed with a signal of 4 mA or
less. The actuator will drive fully open with a signal of 20 mA. Verify that the outdoor air/ return air
dampers can turn without binding.
The outdoor air damper is closed during unoccupied mode.
When the DAT falls below the DAT low limit setpoint or the DAT sensor fails, the Outdoor air damper
is closed.
When the water coil low limit switch trips, it shorts the OAT sensor input to signal the low limit
condition. If the switch trips or the OAT sensor fails, the damper closes.
If the space temperature falls more than 3°F below the heating setpoint, the outdoor air damper
closes. The damper shall remain closed until the space temperature is within 2° of the heating
setpoint.
On chilled water units, if the space temperature rises more than 3°F above the cooling setpoint the
outdoor air damper will close. The damper shall remain closed until the space temperature is within
2° of the cooling setpoint.