Download Honeywell Q674J User's Manual

TRADELINE®
T874G Thermostats
and Q674F,J Subbases
for Heat Pump Systems
Installation Instructions for the Trained Service Technician.
Application
The T874G Thermostats and Q674F,J Subbases provide 24 to 30 Vac control of 2-stage heating and 1-stage cooling heat pump systems with automatic changeover. Stage 1
heat and cool anticipation is fixed voltage type; stage 2 heat
anticipation is adjustable (except as noted). See Table 1 for
specific T874G/Q674F,J combinations and specifications.
TABLE 1—THERMOSTAT/SUBBASE SPECIFICATIONS.
Thermostat/
Subbase
Model
Numbers
LED
Indication
Y594G1252
T874G1246/
Q674F1212
—
Thermostat/
Subbase
Package
Switching
Comments
See
Fig.
System
Fan
Changeover
AUX.HT.,
EM.HT.a
EM.HT.-OFFHEAT-AUTOCOOL
AUTOON
AUTO,
COOL
TRADELINE®
5
T874G1246/
Q674F1410
AUX.HT.,
EM.HT.a
EM.HT.b -OFFHEAT-AUTOCOOL
AUTOON
AUTO,
COOL
Separate W1 and Y1
terminals; TRADELINE ®
subbase.
6
Y594G1419
T874G1642/
Q674F1444
AUX.HT.,
EM.HT.,
CHECK
OFF-EM.HT.HEAT-AUTOCOOL
AUTOON
AUTO,
HEAT OR
COOL
7
Y594G1476c
T874G1741/
Q674F1477
SUPER TRADELINE®;
includes factory-installed
jumper across W1 and Y1;
fixed stage 2 heat anticipation.
Isolated CHECK LED
includes jumper for connecting
X2 terminal to X or R for
power.
Y594G1534d
T874G1824/
Q674F1477
Y594G1526
T874G1626/
Q674F1436
AUX.HT.,
EM.HT.
OFF-EM.HT.HEAT-AUTOCOOL
AUTOON
AUTO,
HEAT
TRADELINE®
8
—
T874D1165
or
T874E1016/
Q674F1543
(RED)e
OFF-EM.HT.HEAT-AUTOCOOL
AUTOON
AUTO
TRADELINE®subbase; exact
replacement for York model
no. 2TB04700524. Thermostat
not included; order separately.
9
Y594G1567
T874G1865/
Q674J1209
EM.HT.
EM.HT.AUTO-OFF
AUTOON
AUTO,
COOL
TRADELINE®; exact
replacement for York model
nos. 2TH11702424 and
6TH11702424.
10
Y594G1575c
T874G1873/
Q674J1225
EM.HT.
EM.HT.AUTO-OFF
AUTOON
AUTO,
COOL
TRADELINE®; exact
replacement for York model
nos. 2TH11702424 and
6TH11702424.
10
Y594G1633
T874G1972/
Q674F1584
AUX.HT.,
EM.HT.
OFF-EM.HT.HEAT-AUTOCOOL
AUTOON
AUTO,
HEAT OR
COOL
TRADELINE®
11
a
EM.HT. also shows compressor malfunction.
When switch is in EM. HT. position, the emergency heat will operate continuously until system switch is moved to another position.
c
Thermostat is white and subbase is gray.
d
Sold only in Australia; degrees C.
e
LED indicator is not labeled but may be connected per user's requirements. See Fig. 9.
b
J.H. • Rev. 7-94 •
M3375
• ©Honeywell Inc. 1994 • Form Number 69-0435—10
Operation
IMPORTANT: Thermostats are calibrated at the factory by
using subbases mounted at true level. Inaccurate subbase leveling will cause thermostat control deviation.
On a 2-stage heating thermostat, the two stages of heat
make sequentially as the temperature drops. Make refers to
the mercury switch initiating a call for heat or cool.
There are about 2° F [1° C] between stages so the
sec-ond stage makes only when the first stage cannot
handle the load. This 2° F [1° C] is referred to as the
interstage differential.
The LED indicators are light emitting diodes on the
subbase that light up when something specific happens
within the system. When an LED lights up, refer to the
following list for the meaning:
EM.HT.: Emergency heat is operating, which means
the system switch is at EM. HT.
AUX.HT.: Auxiliary heat is operating, which means
the weather is so cold that the heat pump can not
handle the load alone.
CHECK: System needs to be checked. See Heating/
Cooling System Instructions for specific meaning.
LEDs are not field replaceable or addable.
M3375
LOCATION
Install the thermostat about 5 ft [1.5 m] above the
floor in an area with good air circulation at average
temperature.
Do not install the thermostat where it can be affected
by:
• drafts, or dead spots behind doors and in corners.
• hot or cold air from ducts.
• radiant heat from sun or appliances.
• concealed pipes and chimneys.
• unheated (uncooled) areas such as an outside
wall behind the thermostat.
MOUNTING THE SUBBASE
The thermostat subbase can be mounted on a vertical
outlet box, horizontal outlet box or directly on the wall.
1. If you must mount the subbase on a vertical outlet
box, order 193121A (beige) or 202689A (gray) Adapter
Assembly. See Fig. 1. The assembly includes an adapter ring,
two screws and a cover plate to cover marks on the wall. Install
the ring and cover plate on the vertical outlet box.
For a wall installation, hold subbase in position and
mark holes for anchors. See Fig. 2. Obtain wall anchors
locally. Set subbase aside. Drill four 3/16 in. [5 mm] holes
and gently tap anchors into the holes until flush with the wall.
2. Run wires to the thermostat location. See wiring
diagrams, Figs. 5-11.
Recycling Notice
This control contains mercury in a sealed tube. Do not
place control in the trash at the end of its useful life.
If this control is replacing a control that contains mercury
in a sealed tube, do not place your old control in the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper disposal
of this control, or of an old control containing mercury in
a sealed tube.
Fig. 1—Installation of Q674 Subbase on outlet
box.
VERTICAL
OUTLET
1
BOX
Installation
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to
follow them could cause a hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
ADAPTER
RING
2
COVER
PLATE 2
MOUNTING
SCREWS (2)
SUBBASE
!
CAUTION
MOUNTING
SCREWS (2)
1. Disconnect power supply to prevent electrical shock or equipment damage.
2. To prevent interference with the thermostat
linkage, keep wire length to a minimum and
run wires as close as possible to the subbase.
3. Do not overtighten thermostat captive mounting screws because damage to subbase threads
can result.
4. Do not short across coil terminals on relay. This
may burn out the thermostat heat anticipator.
5. Never install more than one wire per terminal unless factory-supplied jumper with spade
terminal is used.
69-0435—10
HORIZONTAL
OUTLET
BOX
1
SUBBASE
MOUNTING
SCREWS (2)
1 NOT INCLUDED WITH UNIT.
2 ACCESSORY PARTS AVAILABLE (193121A).
2
M925
Fig. 2—Installation of Q674 Subbase on wall.
Fig. 3—Subbase components and leveling
procedure.
TOP MOUNTING HOLES (2)
WALL
WIRING
TERMINAL
WIRES THROUGH
WALL OPENING
SPIRIT LEVEL
THERMOSTAT
CABLE OPENING
WALL
ANCHORS
(2)
MOUNTING
HOLES
MOUNTING HOLES (2)
SUBBASE
M926
TO SPRING FINGER CONTACTS
ON THE THERMOSTAT
(UP TO 12)
MOUNTING
SCREWS (2)
IMPORTANT: Use 18 gauge, color-coded thermostat
cable for proper wiring.
POST (2) FOR
MOUNTING
THERMOSTAT
M927
Fig. 4—Wiring Connections.
FOR STRAIGHT
INSERTION–
STRIP 5/16 in. [8 mm]
3. Pull wires through the cover plate (if used) and
sub-base cable opening. See Fig. 3. Take care that wires
do not fall back into the wall opening.
4. Secure the cover plate (if used) and subbase with the
screws provided. Do not fully tighten the subbase screws.
5. Level the subbase using a spirit level, as shown in
Fig. 3, and firmly tighten subbase mounting screws.
The subbase mounting holes provide for minor out-oflevel adjustments.
FOR WRAPAROUND–
STRIP 7/16 in. [11 mm]
BARRIER
SUBBASE TERMINAL SCREW
M928
1. Connect the system wires to the subbase as shown
in Figs. 5-11. A letter code located near each terminal is
for identification. The terminal barrier permits straight or
conventional wraparound wiring connection. See Fig. 4.
2. Firmly tighten each terminal screw.
3. Fit wires as close as possible to the subbase. Push
excess wire back into the hole.
4. Plug hole with nonflammable insulation to prevent drafts from affecting the thermostat.
IMPORTANT: An incorrectly leveled subbase will cause
the temperature control to deviate from set point.
WIRING THE SUBBASE
All wiring must comply with local electrical codes and
ordinances. Follow equipment manufacturer wiring instructions when available. To wire subbase, proceed as follows:
3
69-0435—10
Fig. 5—Internal schematic and typical wiring diagram for Y594G1252 (T874G1246/Q674F1212); auto
changeover in cooling.
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
H1 ANTICIPATOR
R
2
RTD1
L1
(HOT)
OTD1
FAN
SWITCH
L2 1
3
EHR1
AUTO
RTD2
2
FALL
H1
ON
W3
4
ODT2
W2
H2
ANTICIPATOR
EHR2
RTD3
5
H2
FALL
6
AUX. HEAT
LED (GRN)
SYSTEM
SWITCH
RTD1
X
OFF
SYSTEM
MONITOR
8
COOL
9
RISE
EM. HEAT
LED (RED)
AUTO
C1
ANTICIPATOR
CHANGEOVER
FAN
RELAY
L
G
HEAT
RD
COOL
CHANGEOVER VALVE
EM. HT.
10
EM. HEAT
RELAY
O
RISE
C1
E
LACO
COMPRESSOR
CONTACTOR
CHP
Y
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
W3 TERMINAL ON SELECT MODELS.
M1589
Fig. 6—Internal schematic and typical wiring diagram for T874G1246/Q674F1410. Separate W1 and Y1
terminals can be jumpered together to form Y terminal.
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
W3
W1 RELAY
W3 RELAY
W1
2
H1
FALL
H1 ANTICIPATOR
B RELAY
FAN SWITCH
B
3
FAN RELAY
AUTO
G
4
L1
(HOT)
ON
R
5
AUX. HEAT RELAY
H2
ANTICIPATOR
6
FALL
AUX. HEAT
LED (GREEN)
OFF
EM. HT.
H2
X
3
HEAT
8
9
CO
C1 ANTICIPATOR
EM. HT.
LED (RED)
AUTO
COOL
L
E
RISE
10
RISE
O
C1
2
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
ON SOME MODELS, Y TERMINAL MAY BE LABELED Y1.
3
EMERGENCY HEAT RUNS CONTINUOUSLY WHEN SWITCH IN IN EM. HT. POSITION.
69-0435—10
COMPRESSOR
FAULT
COOL
CHANGEOVER
VALVE
EM. HT.
RELAY
COMPRESSOR
CONTACTOR
Y
4
L2
1
W2
SYSTEM
SWITCH
M5987A
Fig. 7—Internal schematic and typical wiring diagram for Y594G1419 (T874G1642/Q674F1444),
Y594G1476 (T874G1741/Q674F1477) and Y594G1534 (T874G1824/Q674F1477 sold only in Australia); auto
changeover in heating and cooling; fixed anticipation. CHECK LED has isolated terminals. Factoryinstalled W1-Y1 jumper is equivalent to Y terminal.
THERMOSTAT
SUBBASE
1
CHANGEOVER
(HEAT)
FAN
SWITCH
W3
H1
ANTICIPATOR
FAN RELAY
G
ON
3
R
AUX. HEAT
RELAY
4
FALL
1
L2
L1
(HOT)
W3 RELAY
AUTO
2
FALL
SYSTEM COMPONENTS
W2
H2
EM. HT.
RELAY
5
E
H2 ANTICIPATOR
AUX.
HT. LED
(GREEN)
H1
FALL
6
CHANGEOVER
(COOL)
SYSTEM
SWITCH
8
OFF
9
EM. HT.
RISE
COMPRESSOR
FAULT
X1
CHECK
LED (RED)
X2
HEAT
EM. HT.
LED (RED)
AUTO
10
C1
ANTICIPATOR
X
COOL
COOL CHANGEOVER
RELAY
O
C1
RISE
B
11
W1 RELAY
HEAT CHANGEOVER
RELAY
W1
2
COMPRESSOR
CONTACTOR
Y1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
W1 - Y1 JUMPER IS Y TERMINAL; REMOVE JUMPER WHEN W1 RELAY IS USED.
5
M1230A
69-0435—10
Fig. 8—Internal schematic and typical wiring diagram for Y594G1526 (T874G1626/Q674F1436); auto
changeover in heating.
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
L2
(HOT) L1
1
R
ODT 1
H1 ANTICIPATOR
2
FALL
RTD 1
H1
EHR 1
3
ODT 2
AUTO
4
EHR 2
ON
H2
ANTICIPATOR
5
H2
RTD 2
FAN SWITCH
W2
RTD 3
RTD 1
AUX. HEAT
LED (GREEN)
FALL
X
SYSTEM
SWITCH
EM. HT.
LED (RED)
COMPRESSOR
FAILURE
RD
OFF
L
7
EM. HT.
FALL
CHANGEOVER
8
HEAT
G
AUTO
B
FAN RELAY
HEAT
CHANGEOVER
VALVE
COOL
9
EM. HT.
RELAY
E
C1
ANTICIPATOR
10
EHT1
CHP
LACO
Y
COMPRESSOR
CONTACTOR
C1
1
RISE
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
M1592A
Fig. 9—Internal schematic and typical wiring diagram for T874D1165, T874E1016/Q674F1543. Exact
replacement for York model no. 2TB04700524.
THERMOSTAT
SYSTEM COMPONENTS
SUBBASE
HEAT RELAY 1
1
H1
FALL
W1
FAN
SWITCH
HEAT RELAY 2
AUTO
H1 ANTICIPATOR
L1
(HOT)
L2
1
W2
ON
R
4
LED
(RED)
H2
X
H2
ANTICIPATOR
FALL
6
8
EM. HEAT RELAY
E
SYSTEM
SWITCH
OFF
FAN RELAY
G
C1
RISE
EM. HT.
9
COMPRESSOR
CONTACTOR 2
HEAT
Y2
AUTO
10
C2 ANTICIPATOR
69-0435—10
C2
COMPRESSOR
CONTACTOR 1
COOL
C1 ANTICIPATOR
RISE
2
B
Y1
11
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
LED IS NOT LABELED. JUMPER W2 TO X FOR AUXILIARY HEAT INDICATION. JUMPER E TO X FOR
EMERGENCY HEAT INDICATION. CONNECT SYSTEM MONITOR TO X TO IDENTIFY WHEN SYSTEM
NEEDS TO BE CHECKED.
6
M2982A
Fig. 10—Internal schematic and typical wiring diagram for Y594G1567 (T874G1865/Q674J1209) and
Y594G1575 (T874G1873/Q674J1225); auto changeover in cooling. Exact replacement for York model
nos. 2TH11702424 and 6TH11702424.
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
O
FALL
2
H1
COOL CHANGEOVER VALVE
FAN
SWITCH
H1 ANTICIPATOR
G
AUTO
3
FAN RELAY
ON
L1
(HOT)
R
4
L2
H2 ANTICIPATOR
FALL
5
1
W
AUX. HEAT RELAY
H2
6
SYSTEM
SWITCH
RISE
X
CO
EM. HEAT RELAY
8
EM. HT.
EM. HEAT
LED (RED)
AUTO
B
9
COMPRESSOR
CONTACTOR
OFF
C1 ANTICIPATOR
RISE
Y
10
1
C1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
M5723
Fig. 11—Internal schematic and typical wiring diagram for Y594G1633 (T874G1972/Q674F1584); auto
changeover in heating and cooling.
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
1
FALL
H1 ANTICIPATOR
O
FAN SWITCH
COOL CHANGEOVER
VALVE
AUTO
2
G
ON
B RELAY
H1
FAN RELAY
B
4
L1
(HOT)
R
6
SYSTEM
SWITCH
H2
ANTICIPATOR
L2
E
OFF
L
EM. HT.
H2 FALL
HEAT
1
EM. HT. RELAY
EM. HT.
LED (RED)
AUTO
X
RISE
COOL
8
C1
AUX. HEAT
LED (GREEN)
AUX. HEAT RELAY
9
W2
C1 ANTICIPATOR
Y
10
COMPRESSOR
CONTACTOR
11
CO
RISE
1
12
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
7
M5986
69-0435—10
MOUNTING THE THERMOSTAT
1. Remove the thermostat cover by pulling the bottom edge of the cover away from the base until it snaps
free of the retaining posts.
The current draw must be measured with the thermostat removed and the power on.
Do not short across primary control terminals. This
may burn out the heat anticipator.
1. Connect an ac ammeter of appropriate range between the heating terminals of the subbase as follows:
• Stage 1: between W1 and RH or R.
• Stage 2: between W2 and RH or R.
2. Move the system switch to HEAT or AUTO, and
set the temperature to call for heat.
3. After one minute, read the ammeter and record
the reading.
4. After mounting the thermostat, set the adjustable
heat anticipator to match the readings measured in step 3.
NOTE: The cover is hinged at the top and must be
removed by pulling out at the bottom.
2. Carefully remove and discard the foam packing insert that protects the mercury switches during shipment.
3. If thermostat is being used with a Q674 Subbase
that has LED indication, and the thermostat set point
scale does not have preprinted designations (EM.HT.,
CHECK, etc.), install the desired preprinted insert
packed with the subbase. Push both thermostat set
point levers to the far ends of the thermostat. Use index
finger to gently pull out the set point scale a fraction of
an inch. Insert the desired preprinted insert into the
recessed area behind the set point scale. Make sure
insert is completely seated in recessed area and reposition set point levers to the desired positions.
4. Turn over the thermostat base and note the spring
fingers that engage the subbase contacts. Make sure the
spring fingers are not bent flat, preventing proper electrical contact with the subbase.
5. Set any adjustable heat anticipator indicators to
the respective current setting of each stage. See Setting
the Heat Anticipator section.
6. Note the tabs along the top inside edge of the
thermostat base. The tabs fit into the subbase notches.
Mount the thermostat base on the subbase and tighten
the captive mounting screws. See Fig. 12.
7. Place the upper edge of the thermostat cover on
the thermostat base and swing the cover downward until
it engages with the retaining posts on the base.
TEMPERATURE SETTING
Move the heating and the cooling levers to the desired
positions. The minimum differential between heating and
cooling set points is 4° or 6° F [2° or 3° C], depending
on model; the setting levers are designed so they
cannot be set closer together than 4° or 6° F [2° or 3°
C], depending on the model.
SUBBASE SETTING
!
The Q647F1410 will run the EM. HT. relay
constantly when the system is in the EM. HT.
position. A cycling stat or limit must be provided external to the T874 to control the EM.
HT. relay.
System switching positions control thermostat operation as follows:
OFF: Both the heating and cooling systems are off.
HEAT: Heating system is controlled by the thermostat. Cooling system is off.
COOL: The cooling system is controlled by the
thermostat. Heating system is off.
EM.HT.: Emergency heat relay is energized. The cooling system is off. When the heat pump is inoperable,
switch to EM. HT. setting. The Q674F1410 Subbase
will run EM. HT. relay continuously until the switch
position is changed. All other subbases will cycle
the EM. HT. relay according to room temperature
via the T874 mercury switch.
AUTO: Thermostat automatically changes between heat
and cool modes, depending on the indoor temperature.
Fig. 12—Mounting thermostat on subbase.
THERMOSTAT
MOUNTING SLOTS (2)
THERMOSTAT
MOUNTING POST (2)
OL
CO
50
AT
HE
50
60
70
60
70
CAUTION
80
80
SUBBASE
Fan switching positions control fan operation as follows:
ON: Fan operates continuously.
AUTO: Fan operates with heating or cooling equipment as controlled by the thermostat.
THERMOSTAT
M936
CAPTIVE MOUNTING
SCREWS (2)
To switch positions, use thumb or index finger to
slide the lever to the desired position. Switch lever must
stop in detent over the desired function indicator mark
for proper circuit operation.
Setting
SETTING THE HEAT ANTICIPATOR
On models with adjustable anticipation, set each adjustable anticipator to match the primary control current
draw. If the primary control nameplate has no rating or if
further adjustment is necessary, use the following procedure to determine the current draw for each stage.
69-0435—10
8
Checkout
Calibration
HEATING
Move the system switch on the Q674 Subbase to
HEAT. Move the heating set point lever on the T874
Thermostat about 10° F [6° C] above room temperature. Both stages of heating and fan should start. Move
the set point lever about 10° F [6° C] below room
temperature. Heating and fan should shut off.
THERMOSTAT
T874 Thermostats are accurately calibrated at the
factory. They do not have provision for field calibration.
CAUTION
THERMOMETER
1. Remove thermostat cover by pulling the bottom
edge of the cover away from the base until it snaps free
from the retaining posts.
2. Set the cover on a table near an accurate thermometer.
3. After allowing 10 or 15 minutes for stabilization,
compare the readings. If they are the same, replace the
cover and put the system into operation. If they are
different, recalibrate the thermostat thermometer, step 4.
4. Insert a small screwdriver in the thermometer shaft
(Fig. 13) and turn it until the thermometers read the
same. When the thermometer is calibrated, replace the
cover and place the system into operation.
Do not operate cooling if the outdoor temperature is below 50° F [10° C]. Refer to manufacturer recommendations.
NOTE: Hand heat will offset the thermometer reading.
After making each adjustment, wait 10 or 15 minutes
for the thermometer to stabilize before comparing.
NOTE: To prevent compressor short cycling, a minimum
off-timer may be included to provide a five-minute time
delay before turning on the compressor after the thermostat last turned off the compressor, or after the system
first received power. This delay protects the compressor.
COOLING
!
Move the system switch on the Q674 Subbase to
COOL. Move the cooling set point lever on the T874
Thermostat about 10° F [6° C] below room temperature. Cooling and fan should start (see CAUTION).
Move the cooling set point lever about 10° F [6° C]
above room temperature. Cooling and fan should stop.
Fig. 13—Thermometer calibration.
EMERGENCY HEAT
Change the system switch to EM. HT. The EM. HT.
LED will come on. The Q674F1410 Subbase starts the
electric strip heater(s) when put in the EM. HT. position
(see CAUTION in Subbase Setting section). All other
subbases will be tested by moving the set point lever
about 10° F [6° C] above room temperature. The electric
strip heater(s) will come on. Reset the set point lever
about 10° F [6° C] below room temperature. The electric
strip heater will de-energize. The EM. HT. LED remains
on until the system switch is moved to another position.
FAN
Move the subbase system switch to OFF, and the fan
switch to ON. The fan should run continuously. When
the fan switch is in the AUTO position, the fan operates
with the heating or cooling equipment.
M5070
9
69-0435—10
69-0435—10
10
11
69-0435—10
Home and Building Control
Honeywell
1985 Douglas Drive North
Golden Valley, Minnesota 55422
69-0435–10
Printed in U.S.A.
Home and Building Control
Honeywell Limited—Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9