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Installation, Operation & Maintenance Manual - 50 Hz
DMS Saber Series
Air Cooled Packaged Air Conditioners 7.5, 8.5, 10.0 to 12.5 TR
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 2
TABLE OF CONTENTS
GENERAL
Safety considerations ................................................................
Inspection ..................................................................................
Renewal parts ...........................................................................
Product nomenclature ...............................................................
3
3
3
4
INSTALLATION
Limitations ................................................................................ 4
Location .................................................................................... 5
Rigging and handling ................................................................ 5
Clearances ................................................................................ 5
Ductwork .................................................................................. 5
Fixed outdoor air intake damper................................................ 5
Condensate drain ...................................................................... 6
Compressors ............................................................................. 7
Filters ........................................................................................ 7
Service access .......................................................................... 7
Thermostat ............................................................................... 7
Power and control wiring .......................................................... 7
Optional electric heat ................................................................ 7
Phasing ..................................................................................... 8
Product data ............................................................................. 9
Dimensions and clearances (DMS 090, 100 & 120) .................. 10
Dimensions and clearances (DMS) 150...................................... 11
Drive and pulley data ................................................................ 12
Electrical data ........................................................................... 12
Fan performance data ............................................................... 13
Checking supply air cfm ............................................................ 14
SAFETY
Terminology ..............................................................................
Operational safety .....................................................................
Use and Operation ....................................................................
Adherence to warnings .............................................................
Staff training .............................................................................
Use of the unit ..........................................................................
Recommended safety practices ................................................
Applicable standards of EEC machinery directive .....................
14
14
15
15
15
15
15
16
OPERATION
Sound power ratings ................................................................
Volt free contact .......................................................................
Sequence of operations ............................................................
Cooling operation errors ...........................................................
High pressure limit switch .........................................................
Low pressure limit switch ..........................................................
Freezestat .................................................................................
Low ambient cooling .................................................................
Safety controls ..........................................................................
Compressor protection .............................................................
Flash codes ...............................................................................
Reset .........................................................................................
Electric heating sequence of operations ...................................
Heating operation errors ...........................................................
17
17
17
17
18
18
18
18
18
18
18
19
19
19
START UP
Restart check list .......................................................................
Operating instructions ...............................................................
Post start check list ...................................................................
Shut down .................................................................................
Belt drive blower .......................................................................
19
19
19
19
19
TROUBLE SHOOTING
Cooling trouble shooting guide ................................................. 20
Unit flash codes ........................................................................ 22
MAINTENANCE
Every month ..............................................................................
Every three months ...................................................................
Every six months .......................................................................
Every twelve months .................................................................
23
23
23
23
LIST OF FIGURES AND ILLUSTRATIONS
Typical unit configuration .......................................................... 3
Product nomenclature ............................................................... 4
Typical rigging ........................................................................... 5
Fixed outdoor air intake damper ............................................... 6
Condensate drain ...................................................................... 6
Loading points ........................................................................... 6
Typical field wiring .................................................................... 8
Dimensions and clearances (DMS 090, 100 & 120) .................. 10
Dimensions and clearances (DMS) 150...................................... 11
Belt adjustment ......................................................................... 14
Unit nameplate .......................................................................... 14
Motor nameplate ...................................................................... 14
Warnings ................................................................................... 15
LIST OF TABLES
Unit application data .................................................................
Loading Points ...........................................................................
Control wire sizes ......................................................................
Minimum cfm limitation ............................................................
Product data ..............................................................................
Drive and pulley data ................................................................
Electrical data ............................................................................
Fan performance data ...............................................................
Applicable standards of EEC machinery directive ......................
Sound power levels (DMS Saber units) .....................................
Unit flash codes ........................................................................
4
6
7
7
9
12
12
13
16
17
23
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 3
GENERAL
RENEWAL PARTS
YORK Saber units are single package air conditioners equipped
with optional factory installed electric heaters and designed for
outdoor installation on a rooftop or steel structure.
Refer to York USER’S MAINTENANCE and SERVICE
INFORMATION MANUAL. It is strongly suggested that only
genuine YORK Spare Parts are used to ensure efficient working
of the unit and safety.
The units are completely assembled on a rigid base frame. All
piping, refrigerant charge, and electrical wiring is factory installed
and tested. The units require electric power, duct connections
and drain piping connections at the point of installation.
The supplemental electric heaters have nickel-chrome elements
and utilize single point power connection.
SAFETY CONSIDERATIONS
Due to system pressure, moving parts and electrical components,
installation and servicing of air conditioning equipment can be
hazardous. Only qualified, trained, service personnel should
install, repair, maintain or service this equipment.
Observe all precautions in the literature, on labels and tags
accompanying the equipment whenever working on air
conditioning equipment. Be sure to follow all other safety
precautions that apply.
CAUTION
THIS PRODUCT MUST BE INSTALLED IN STRICT COMPLIANCE
WITH THE ENCLOSED INSTALLATION INSTRUCTIONS AND
ANY APPLICABLE LOCAL, STATE, AND NATIONAL CODES
INCLUDING, BUT NOT LIMITED TO, BUILDING, ELECTRICAL, AND
MECHANICAL CODES.
WARNING
IMPROPER INSTALLATION MAY CREATE A CONDITION WHERE
THE OPERATION OF THE PRODUCT COULD CAUSE PERSONAL
INJURY OR PROPERTY DAMAGE.
Wear safety glasses and work gloves, and follow all safety codes.
Use a quenching cloth and have a fire extinguisher available for
all brazing operations.
Installer should pay particular attention to the words :
NOTE, CAUTION and WARNING.
INSPECTION
NOTES are intended to clarify or make the installation easier.
As soon as a unit is received, it should be inspected for possible
damage during transit. If damage is evident, the extent of the
damage should be noted on the carrier’s freight bill.
CAUTIONS are given to prevent equipment damage.
WARNINGS are given to alert installer that personal injury and/
or equipment damage may result if installation procedure is not
handled properly.
TYPICAL UNIT CONFIGURATION
Figure 1: Typical Unit Configuration
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 4
NOMENCLATURE
INSTALLATION
LIMITATIONS
Read these instructions before continuing this appliance
installation. This is an outdoor combination heating and cooling
unit. The installer must assure that these instructions are made
available to the consumer and with instructions to retain them
for future reference.
These units must be installed in accordance with the applicable
national and local safety codes. (Refer to Unit Application Data
table).
If components are to be added to a unit to meet local codes,
they are to be installed at the dealer’s and/or the customer’s
expense. Size of unit for proposed installation should be based
on heat loss/heat gain calculation.
Table 1: Unit Application Data
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 5
LOCATION
WARNING
Use the following guidelines to select a suitable location for
these units :
BEFORE LIFTING A UNIT, MAKE SURE THAT ALL PANELS ARE IN
PLACE AND THAT ITS WEIGHT IS DISTRIBUTED EQUALLY ON
ALL CABLES SO IT WILL LIFT EVENLY.
1.
Unit are designed for outdoor installation only.
2.
Condenser coils must have an unlimited supply of air.
3.
Where a choice of location is possible, position the unit on
either north or east side of building.
CLEARANCES
4.
For ground level installation, use a level concrete slab. The
length and width should be at least 6 inches greater than the
unit base rails. Do not tie slab to the building foundation.
5.
Roof structures must be able to support the weight of
the unit and its options and/or accessories. Unit must be
installed on a solid level roof curb.
All units require certain clearances for proper operation and
service. Installer must make provisions for adequate ventilation
air in accordance with applicable provisions of the local building
codes. Refer to Dimensions and Clearances. Refer Figures 7
& 8 for the clearances required for servicing, and proper unit
operation.
6.
Maintain level tolerance to 1/2 inch maximum across the
entire length or width of the unit.
RIGGING AND HANDLING
Exercise care when moving the unit. Do not remove any
packaging until the unit is near the place of installation. Rig the
unit by attaching chain or cable slings to the round lifting holes
provided in the base rails. Spreaders, whose length exceeds
the largest dimension across the unit, MUST BE USED. Refer to
Figure 2. Units may also be moved or lifted with a forklift, from
the side only, provided that an accessory skid is used.
LENGTH OF FORKS MUST BE A MINIMUM OF 70”. Refer to the
Product Data Table 5 for unit weights.
WARNING
DO NOT PERMIT OVERHANGING STRUCTURES OR SHRUBS TO
OBSTRUCT OUTDOOR AIR DISCHARGE OUTLET
DUCTWORK
A closed return duct system should be used. This should not
preclude use of outdoor fresh air intake. The supply and return
air duct connections at the unit should be made with flexible
joints to minimize noise. The supply and return air duct systems
should be designed for the CFM and static requirements of the
job. They should NOT be sized to match the dimensions of the
duct connections on the unit.
WARNING
WHEN FASTENING DUCTWORK TO SIDE DUCT FLANGES ON
UNIT, INSERT SCREWS THROUGH DUCT FLANGES ONLY. DO NOT
INSERT SCREWS THROUGH CASING. OUTDOOR DUCTWORK
MUST BE INSULATED AND WATERPROOFED.
Refer to Dimensions and Clearances Figure 8 for information
concerning supply and return air duct openings.
FIXED OUTDOOR AIR INTAKE DAMPER
This damper is shipped inside the return air compartment. It is
completely assembled and ready for installation. Refer to the
Fixed Outdoor Damper Figure 3.
Gasketing and mounting screws are provided in a parts bag.
Adjusting the damper to the desired air flow may be done after
installation by opening or closing dampers with handle.
Figure 2: Typical Rigging
Damper provides maximum of 25% fresh air when fully opened.
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 6
FIGURE 3 : FIXED OUTDOOR AIR DAMPER
Figure 3: Fixed Outdoor Air Damper
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing compound
on male pipe threads. Install a condensate drain line from the
one-inch FPT female connection on the unit to an open drain.
NOTE : The condensate drain operates in a negative pressure
in the cabinet. The condensate drain line MUST be trapped to
provide proper drainage. See Figure 4.
FIGURE 5 : LOADING POINTS
Pa
Installation, Operation and Maintenance Manual : 036-1009(0606)
Figure 4: Recommended Drain Piping
Figure 5: Loading Points
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 7
COMPRESSORS
Units are shipped with factory adjusted compressor mountings
and ready for operation.
CAUTION
DO NOT LOOSEN COMPRESSOR MOUNTING BOLTS. REMOVE
COMPRESSOR SHIPPING BRACKETS BEFORE START-UP.
FILTERS
Two inch filters can be supplied with each unit. Filters must
always be installed ahead of the evaporator coil and must be
kept clean or replaced with same size and type. Dirty filters will
reduce the capacity of the unit and will result in frosted coils
or safety shutdown. Minimum filter area and required sizes are
shown in Product Data Table 4.
SERVICE ACCESS
The following removable panels provide access to all serviceable
components :
•
•
•
•
•
Compressor compartment
Electric Heat compartment
Blower compartment
Main control box
Filter compartment
Refer to the Dimensions and Clearances Figure 7 & 8 for location
of these access panels.
comply with local codes. Refer to the Dimensions and Clearances
Figures 7 & 8 for installation location.
If any of the wire supplied with the unit must be replaced,
replacement wire must be of the type shown on the wiring
diagram and the same minimum gauge as the replaced wire.
Electrical line must be sized properly to carry the load. Use
copper conductors only. Each unit must be wired with a separate
branch circuit fed directly from the meter panel and properly
fused.
Emergency stop button should be field installed as per wiring
diagram. The activator should be red in colour with a yellow
outline background, and should be easily accessible. The device
should be self latching type and contacts must be of positive
opening operation, certified to EN60947 - 5 - 1.
CAUTION
WHEN CONNECTING ELECTRICAL POWER AND CONTROL
WIRING TO THE UNIT, WATERPROOF TYPE CONNECTORS MUST
BE USED SO THAT WATER OR MOISTURE CANNOT BE DRAWN
INTO THE UNIT DURING NORMAL OPERATION. THE ABOVE
WATERPROOFING CONDITIONS WILL ALSO APPLY WHEN
INSTALLING A FIELD SUPPLIED DISCONNECT SWITCH.
Refer to Typical Wiring Diagram, Figure 6 and to the appropriate
unit wiring diagram for control circuit and power wiring
information.
THERMOSTAT
The room thermostat should be located on an inside wall
approximately 56 inches above the floor where it will not be
subject to drafts, sun exposure or heat from electrical fixtures
or appliances. Follow manufacturers instructions enclosed with
thermostat for general installation procedure. A minimum of
seven color coded insulated wires (#18 AWG) should be used to
connect thermostat to unit.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of the
National Electrical Code and/or local ordinances. The unit must
be electrically grounded in accordance with NEC and/or local
codes.
Table 2: Control Wire Sizes
OPTIONAL ELECTRIC HEAT
The factory installed heaters are wired for single point power
supply. Power supply need only be brought into the single point
terminal block and thermostat wiring to the low voltage terminal
strip located in the upper portion of the unit control box.
These heaters are located within the supply air chamber. Refer
to Figuress 7 & 8 for access panel location. Fuses are supplied by
the factory. Refer to Table 3 for minimum CFM limitations and to
Table 5 for electrical data.
Voltage tolerances, which must be maintained at the compressor
terminals, during starting and running conditions, are indicated
on the unit Rating Plate and the Unit Application Data table.
A fused disconnect switch should be field provided based on the
tabulated rating, with a short circuit capacity of 10K or more,
for the unit. The switch must be separate from all other circuits.
Wire entry at knockout openings require conduit fittings to
Table 3: Minimum CFM Limitation
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 8
Figure 6: Typical Field Wiring Schematic
PHASING
YORK Saber units are properly phased at the factory. Check for
proper compressor rotation. If the blower or compressors rotate
in the wrong direction at start up, the electrical connection to the
unit is mis-phased. Change the incoming line connection phasing
to obtain proper rotation.
CAUTION
UNITS ARE PROPERLY PHASED AT THE FACTORY. DO NOT
CHANGE THE INTERNAL WIRING TO MAKE THE BLOWER,
CONDENSER FAN, OR COMPRESSOR ROTATE CORRECTLY.
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 9
PRODUCT DATA
Table 4: Product Data
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 10
Clearances
inches
mm
Front (Compressor Access)
36
914
Back (Blower Fan Access)
36
914
Left (Filter Access)
30
762
Right (Condenser Coil)
36
914
Above (Condenser Air Discharge)
72
1829
Figure 7: DIMENSIONAL DATA AND CLEARANCES DMS 090, 100 & 120
DIMENSIONS AND CLEARANCES DMS 090, 100 & 120
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 11
Clearances
inches
mm
Front (Control Panel & Compressor Access)
36
914
Left (Filter Access)
30
762
Right (Condenser Coil)
36
914
Above (Condenser Air Discharge)
72
1829
Figure 8: DIMENSIONAL DATA AND CLEARANCES DMS 150
DIMENSIONS AND CLEARANCES : DMS 150
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 12
DRIVE AND PULLEY DATA
Low Static Drive Set
Pitch Diameter
Model
DMS
Motor
Pulley
Bush
Min
Max
Pitch Dia
Bush
Fan Pulley
mm
Centre
Distance
RPM Range
mm
Min
Max
mm
Belt Size
90
VAR 108 A1
1210 x 24 mm
78
102
SPA-180 1
1610 x 25 mm
180
628
822
490
1404
100
VAR 108 A1
1210 x 24 mm
78
102
SPA-170 1
1610 x 25 mm
170
665
870
490
1388
120
VAR 108 A1
1210 x 28 mm
78
102
SPA-170 1
1610 x 25 mm
170
665
870
490
1388
150
VAR 108 A1
1210 x 28 mm
78
102
SPA-200 1
2012 x 25 mm
200
566
740
495
1446
Centre
Distance
Belt Size
Standard Drive Set
Pitch Diameter
Model
DMS
Motor
Pulley
Bush
Min
Max
Fan Pulley
Pitch Dia
Bush
mm
RPM Range
mm
Min
Max
mm
90
VAR 108 A1
1210 x 24 mm
78
102
SPA-125 1
1610 x 25 mm
125
905
1183
435
1207
100
VAR 108 A1
1210 x 24 mm
78
102
SPA-132 1
1610 x 25 mm
132
857
1120
435
1207
120
VAR 108 A1
1210 x 28 mm
78
102
SPA-132 1
1610 x 25 mm
132
854
1120
435
1207
150
VAR 108 A1
1210 x 28 mm
78
102
SPA-150 1
1610 x 25 mm
150
754
986
495
1357
High Static Drive Set
Pitch Diameter
Model
DMS
Motor
Pulley
Bush
Min
Max
Fan Pulley
Pitch Dia
Bush
mm
Centre
Distance
RPM Range
mm
Min
Max
Belt Size
mm
90
VAR 108 A1
1210 x 28 mm
78
102
SPA-112 1
1610 x 25 mm
112
1010
1321
435
1180
100
VAR 108 A1
1210 x 28 mm
78
102
SPA-106 1
1610 x 25 mm
106
1067
1395
435
1180
120
VAR 108 A1
1210 x 28 mm
78
102
SPA-106 1
1610 x 25 mm
106
1067
1395
435
1180
150
VAR 108 A1
1210 x 28 mm
78
102
SPA-118 1
1610 x 25 mm
118
958
1253
495
1317
Table 5: Drive Pulley Data
ELECTRICAL DATA
380-415 V / 3 Ph / 50 Hz
Power Supply
Model
Compressors
RLA Each
DMS 090
DMS 100
DMS 120
DMS 150
12.7
14.3
16.4
11.6
LRA Each
98.0
130.0
130.0
80.0
Condenser
Fan Motors
Supply Blower Motor
Standard
FLA
FLA Each
2.3
2.3
2.3
4.3
Extended
3.6
3.6
4.9
6.6
4.9
4.9
6.6
8.6
Electric Heater
Minimum Circuit
Amperes
Maximum Fuse
Breaker Size
kW
Amperes
Amperes
Amperes
-
-
24.8
40
9.0
13.7
24.8
40
18.0
27.3
33.2
50
-
-
27.1
40
9.0
13.7
27.1
40
18.0
27.3
33.2
50
-
-
31.5
40
9.0
13.7
31.5
40
18.0
27.3
34.5
50
-
-
41.0
60
18.0
27.3
41.0
60
36.0
54.7
65.6
90
Table 6: Electrical Data
2.2
1.5
2.2
12 / 12
12 / 12
15 / 15
100
120
150
4
3
Tab;e 7: Fan Performance Data
3
2.2
1.5
12 / 12
90
kW
kW
Size
Optional
DMS
Standard
Motor
Fan
Model
733
6000 2831
602
4500 2124
644
544
3750 1770
5000 2360
961
4800 2265
756
3500 1652
831
686
3000 1416
4000 1888
845
4000 1888
697
3000 1416
753
637
2500 1180
3400 1604
732
3250 1534
889
824
769
903
826
780
728
809
780
728
705
RPM
1.66
1.05
0.81
0.53
784
703
664
615
952
897
1.85
1.20
0.94
0.63
833
757
723
681
1.92 1054
1.21
0.89
846
967
1.24
0.65
900
855
807
883
855
807
792
RPM
965
924
885
949
924
885
876
RPM
964
916
2.03
1.33
1.07
0.75
879
810
778
743
2.06 1105
1.36 1015
1.03
0.76
989
962
958
RPM
1026
989
962
980
2.21
1.47
1.19
0.88
924
860
832
805
2.21 1158
1.51 1076
1.16 1025
0.85
1.54 1090
1.11
0.86
0.61
RPM
1071
2.37
1.62
1.34
1.02
966
908
885
864
2.39 1211
1.66 1132
1.27 1081
0.93 1045
1.70 1144
1.22 1083
0.94 1053
0.70 1036
1.11
0.94 1053
0.70 1036
RPM
955
935
921
2.53 1009
1.78
1.49
1.16
2.58 1262
1.80 1184
1.37 1137
1.02 1109
1.84 1197
1.31 1140
1.04 1118
0.81 1108
1.20 1131
1.04 1118
0.81 1108
RPM
986
976
2.69 1049
1.95 1003
1.66
1.32
2.77 1312
1.94 1234
1.47 1193
1.13 1173
1.97 1245
1.41 1198
1.14 1181
0.92 1177
1.30 1191
1.14 1181
0.92 1177
RPM
-
2.88 1090
2.12 1048
1.83 1035
1.48 1029
2.95
2.05 1282
1.57 1249
1.25 1234
2.07 1293
1.51 1255
1.26 1242
1.05 1243
1.41 1249
1.26 1242
1.05 1243
RPM
-
-
3.07 1129
2.31 1093
2.01 1083
1.65 1082
-
2.15 1330
1.69 1304
1.37 1295
2.17
1.64 1311
1.39 1303
1.18 1307
1.54 1307
1.39 1303
1.18 1307
3.27
2.50
2.19
1.83
-
2.26
1.81
1.51
-
1.77
1.53
1.31
1.67
1.53
1.31
1.21
kW
2.00 [498]
1.09 1315
kW
1.80 [448]
0.96 1249
kW
1.60 [399]
0.84 1182
kW
1.40 [349]
0.73 1111
kW
1.20 [299]
0.62 1036
kW
1.00 [249]
1.01 1011
0.86
0.61
0.52
kW
0.80 [199]
1.39 1029
0.99
0.77
0.53
0.91
0.77
0.53
0.44
kW
0.60 [149]
0.86
0.66
0.46
0.78
0.66
0.46
0.37
kW
0.40 [100]
1.83 1004
1.11
0.78
0.54
1.13
0.75
0.55
0.37
0.67
0.55
0.37
0.30
kW
[50]
External Static Pressure in.wg. [Pa]
Area shaded in grey represent upsize motors
637
2500 1180
697
612
2250 1062
3000 1416
RPM
0.20
L/s
cfm
Air Flow
Rate
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 13
FAN PERFORMANCE & ADDITIONAL PRESSURE DROPS
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 14
CHECKING SUPPLY AIR CFM
The RPM of the supply air blower will depend on the required
CFM, the unit accessories or options and the static resistances
of both the supply and the return air duct systems. With this
information, the RPM for the supply air blower and the motor
pulley adjustment (turns open) can be determined from the Fan
Performance Data Tables.
High speed drive accessories (containing a smaller blower pulley
and a shorter belt) are available for applications requiring the
supply air blower to produce higher CFM and/or higher static
pressures. Refer to the Drive and Pulley Data Table 6.
Figure 10: Unit Nameplate
Sr.#
Frame
Figure 9: Belt Adjustment
Note the following :
1.
The supply air CFM must be within the limitations shown in
the Unit Application Data Table 1.
2.
Pulleys can be adjusted in half turn increments.
3.
The tension on the belt should be adjusted as shown in the
Belt Adjustment Figure 9.
Start the supply air blower motor. Adjust the resistances in
both the supply and the return air duct systems to balance
the air distribution throughout the conditioned space. The
job specifications may require that this balancing be done by
someone other than the equipment installer.
WARNING
FAILURE TO PROPERLY ADJUST THE TOTAL SYSTEM AIR
QUANTITY CAN RESULT IN EXTENSIVE BLOWER DAMAGE
SAFETY
This section of the IOM covers Safety Aspects applicable to
the York DMS Saber Roof Top Air Conditioners. Adherence to
the instructions detailed hereunder, will ensure the safety of
the operators, prevent damage to the equipment and prevent
accidents.
IP
ICL
IC
S
54
F
41
1
V
¨ 220
Y 380
Y 460
Y 380-415
kW
1.1
1.1
1.1
1.1
QSX90L6B02
Ph
3
3
3
3
Hz
60
60
60
50
rpm
1110
1110
1125
935
A
5.4
3.1
3.2
3.3
Cos Ɏ
0.72
0.72
0.67
0.69
Figure 11: Motor Nameplate
TERMINOLOGY
The internal section of the unit adjacent to moving parts and
electrical parts or devices is considered as the ‘danger zone’.
Prior to gaining access to these parts, it is necessary to acquire
the proper tools to deactivate the safety devices. The operators
are responsible for transport, installation, start up, service and
maintenance, including cleaning and trouble shooting.
OPERATIONAL SAFETY
York DMS Saber Roof Top Packages Air Conditioners in
conformance to the highest standards of operational as well as
operator safety. Nevertheless, hazards may occur if the units
are used for purposes other than the designed use(s), Units are
operated by untrained staff and / or Units are not operated in
conformance with general standards prevalent in the industry.
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 15
OPERATION AND USE OF THE UNIT IN
CONFORMANCE WITH GENERAL STANDARDS AND
PROVISIONS
3.
Warnings against coming into contact with electrical parts.
YORK DMS Saber Roof Top Packaged Air Conditioners are
designed for and are able to cool, heat, filter air and operate in
the fan mode.
Any other use is considered not in conformity with general
provisions. The manufacturer is not responsible for any resulting
damages. All responsibility resulting from such non conformity
rests with the user.
In order to use the unit according to general provisions proper
instructions for installation, exercise and transport must be
observed.
Installation and start up of the unit must satisfy the national
codes and standards having legal validity in the country of
use. The user is responsible for compliance with standards.
Additionally, any type of work that may compromise safety
should be avoided. Arbitrary transformations or modifications to
the unit by the user or operator are not permitted and nullify the
warranty of the manufacturer. The manufacturer will also not be
responsible for any damages to the equipment, to property or to
personnel.
ADHERENCE OF THE USER / OPERATOR TO THE
WARNINGS AND OTHER INSTRUCTIONS
Clear signs are placed at appropriate locations on the unit
showing :
1.
Prohibition to repair or adjustments during motion.
CURRENT
All warnings and signs regarding the units must be absolutely
observed.
STAFF TRAINING
The unit should be started up and serviced (routine and
corrective maintenance) by authorized and trained staff only. This
staff must be informed about possible hazards regarding :
•
•
•
•
Electrical connections
Piping connections
Duct connections
Start up
These operations must be executed only by trained persons.
who, on behalf of the user, attend to control and to perform
extraordinary / ordinary maintenance of the unit. It is necessary
to establish and to respect the responsibilities for control and
maintenance to guaranty safety, without confusion.
USE OF THE UNIT
The unit must be started up only by means of proper safety
devices. The installer is obliged to install the unit according to
installation plans and conditions. Only authorized persons must
operate the unit.
DONT REPAIR OR
ADJUST DURING THE
MOVEMENT
2.
Obligation to turn off the power before opening the access
doors.
The staff in charge is obliged to immediately inform the user of
any changes that may compromise safety. For this reason it is
necessary to inspect for eventual anomalies or damages at least
once a week.
The user or operator must never dismount and deactivate safety
devices. If these have to be removed for maintenance, all safety
devices must be reinstalled at their correct location once the
maintenance is complete. For all operations of maintenance, the
power source must be locked out.
If it is necessary to undertake maintenance activities, the fan
must be switched off, isolated and allowed to run down.
RECOMMENDED SAFETY PRACTICES
TURN OFF POWER
BEFORE OPENING
This publication explains the proper use and installation
of equipment in order to warn operating and maintenance
personnel of the commonly recognized dangers associated
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 16
with this equipment. In addition to following the manufacturer’s
installation instructions, care must be taken to ensure compliance
with federal, state and local rules, regulations, codes and
standards.
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 17
OPERATION SOUND POWER RATINGS
COOLING SEQUENCE OF OPERATION
A sound power level is a measure of the total noise radiated by
the machine in all directions. It is a property of the machine and
is essentially independent of the measuring environment. Sound
power levels are useful to equipment manufacturers, buyers,
installers, and users for :
•
By setting the room thermostat fan switch to “ON” the supply air
blower will operate continuously.
•
•
Calculating the sound pressure level from a machine at a
given distance in a given environment.
•
Comparing the noise output from different machines.
•
Setting specifications for the maximum permitted noise from
a machine.
•
Comparing machines before and after modifications to
reduce the noise.
Sound power is measured in watts or picowatts, and sound
power levels are traditionally given in decibels (dB re 1pW). Refer
table 8 for sound power level of whole unit:
Table 8: Sound Power Levels (DMS SABER UNITS)
VOLT FREE CONTACT
All Saber units are supplied with volt free contact, Refer to
Electrical wiring schematic that are pasted inside the unit.
CAUTION
HOOK UP EMERGENCY SHUT - OFF BUTTON
CONTINUOUS BLOWER
INTERMITTENT BLOWER
With the room thermostat fan switch set to “AUTO” and the
system switch set to either the “AUTO” or “HEAT” settings, the
blower is energized whenever a cooling or heating operation is
requested. The blower is energized after any specified delay
associated with the operation. When energized, the indoor
blower has a minimum run time of 30 seconds. Additionally, the
indoor blower has a delay of 10 seconds between operations.
•
NO OUTDOOR AIR OPTIONS
When the thermostat calls for the first stage of cooling, the low
voltage control circuit from “R” to “Y1” and “G” is completed. For
first stage cooling, compressor #1, condenser fan motor will
energize. After completing the specified fan on delay for cooling,
the UCB will energize the blower motor.
When the thermostat calls for the second stage of cooling,
the low voltage control circuit from “R” to “Y2*” is completed.
Compressor # 2 is energized, provided it has not been locked
out. If there is an initial call for both stages of cooling, the UCB
will delay energizing compressor # 2 by 30 seconds in order to
avoid a power in rush. Once the thermostat has been satisfied, it
will de-energize Y1 and Y2*.
If the compressors have satisfied their minimum run times, the
compressors and condenser fan are de-energized. Otherwise,
the unit operates each cooling system until the minimum run
times for the compressors have been completed. Upon the final
compressor de-energizing, the blower is stopped following the
elapse of the fan off delay for cooling. To be available, a
compressor must not be locked out due to a high or low pressure
switch or freezestat trip and the anti short cycle delay (ASCD)
must have elapsed.
NOTE : 2nd stage of cooling is available only in DMS 150.
SEQUENCE OF OPERATIONS OVERVIEW
For these units, the thermostat makes a circuit between “R”
and “Y1” for the first stage of cooling. The call is passed to the
unit control board (UCB), which then determines whether the
requested operation is available and, if so, which components to
energize. For electric heat units, the UCB passes the call to the
electric heater. In both cases, when the “W1” call is sensed, the
indoor air blower is energized following a specified heating delay.
If at any time a call for both heating and cooling are present, the
heating operation will be performed. If operating, the cooling
system is halted as with a completion of a call for cooling
Heating always takes priority.
* Applicable only to DMS 150
COOLING OPERATION ERRORS
Each cooling system is monitored for operation outside of the
intended parameters. Errors are handled as described below. All
system errors override minimum run times for compressors.
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 18
HIGH PRESSURE LIMIT SWITCH
extend the minutes of compressor operation.
During cooling operation, if a high pressure limit switch opens,
the UCB will de-energize the associated compressor, initiate the
ASCD (anti short cycle delay), and, if the other compressor is
idle, stop the condenser fan. If the call for cooling is still present
at the conclusion of the ASCD, the UCB will re-energize the
halted compressor.
The defrost cycle will begin immediately following the elapse of
the minimum run time. When operating in low ambient mode,
the UCB will not lockout the compressors due to a freezestat
trip. However, a freezestat trip will de-energize the associated
compressor. If the call for cooling is still present at the end of
the ASCD and the freezestat has closed, the unit will resume
operation.
Should a high pressure switch open three times within two hours
of operation, the UCB will lock out the associated compressor
and flash a code (see Table 10). If the other compressor is
inactive, the condenser fan will be de-energized.
LOW PRESSURE LIMIT SWITCH
initial 30 seconds of a cooling system’s operation. For the
following 30 seconds, the UCB will monitor the low pressure
switch to ensure it closes. If the low pressure switch fails to close
after the 30 second monitoring phase, the UCB will de-energize
the associated compressor, initiate the ASCD, and, if the other
compressor is idle, stop the condenser fan.
Once the low pressure switch has been proven (closed during
the 30 second monitor period described above), the UCB will
monitor the low pressure limit switch for any openings. If the low
pressure switch opens for greater than 5 seconds, the UCB will
de-energize the associated compressor, initiate the ASCD, and,
if the other compressor is idle, stop the condenser fan. If the call
for cooling is still present at the conclusion of the ASCD, the UCB
will re-energize the halted compressor. Should a low pressure
switch open three times within one hour of operation, the UCB
will lock out the associated compressor and flash a code (table
10). If the other compressor is inactive, the condenser fan will be
de-energized.
SAFETY CONTROLS
The unit control board monitors the following inputs for each
cooling system :
1.
A suction line freezestat to protect against low evaporator
temperatures due to a low air flow or a low Installation,
return air temperature, (opens at 26 ± 5°F and resets at 38 ±
5°F).
2.
A high pressure switch to protect against excessive
discharge pressures due to a blocked condenser coil or a
condenser motor failure, (opens at 415 ± 15 psig and resets
at 280 ± 15 psig).
3.
A low pressure switch to protect against loss of refrigerant
charge, (opens at 35 ± 5 psig and resets at 60 ± 5 psig).
The above pressure switches are hard soldered to the unit.
The refrigeration systems are independently monitored and
controlled. On any fault, only the associated system will be
affected by any safety / preventive action.
The other refrigerant system will continue in operation unless it
is affected by the fault as well. The unit control board monitors
the temperature limit switch of electric heat units.
FREEZESTAT
COMPRESSOR PROTECTION
During cooling operation, if a freezestat opens, the UCB will deenergize the associated compressor, initiate the ASCD, and, if the
other compressor is idle, stop the condenser fan. If the call for
cooling is still present at the conclusion of the ASCD, the UCB will
reenergize the halted compressor. Should a freezestat open three
times within two hours of operation, the UCB will lock out the
associated compressor and flash a code (table 10). If the other
compressor is inactive, the condenser fan will be de-energized.
The compressors also have inherent (internal) protection. If there
is an abnormal temperature rise in a compressor, the protector
will open to shut down the compressor. The UCB incorporates
features to minimize compressor wear and damage.
LOW AMBIENT COOLING (OPTIONAL)
To determine when to operate in low ambient mode, the UCB
has a pair of terminals connected to a temperature activated
switch set at 50°F. When the low ambient switch is closed and
the thermostat is calling for cooling, the UCB will operate in the
low ambient mode.
Low ambient mode operates the compressors in this manner
: 10 minutes on, 5 minutes off. The indoor blower is operated
throughout the cycle. The 5 minute off period is necessary to
defrost the indoor coil. Low ambient mode always begins with
compressor operation. Compressor minimum run time may
An anti short cycle delay (ASCD) is utilized to prevent operation
of a compressor too soon after its previous run. Additionally,
a minimum run time is imposed any time a compressor is
energized.
The ASCD is initiated on unit start up and on any compressor
reset or lock out.
NOTE : 2nd stage of cooling is available only in DMS 150.
FLASH CODES
The UCB will initiate a flash code associated with errors within
the system. Refer to UNIT CONTROL BOARD FLASH CODES Table
10.
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 19
RESET
START UP (COOLING)
Remove the call for cooling, by raising thermostat setting higher
than the conditioned space temperature. This resets any pressure
or freezestat flash codes.
PRESTART CHECK LIST
ELECTRIC HEATING SEQUENCE OF OPERATIONS
1.
Check the electrical supply voltage being supplied. Be sure
that it is the same as listed on the unit nameplate.
The following sequence describes the operation of the electric
heat section. Two stage heating (Heaters MUST use a two stage
thermostat) :
2.
Set the room thermostat to the on position.
3.
Turn unit electrical power on.
4.
Set the room thermostat fan switch to on.
5.
Check indoor blower rotation. If blower rotation is in
the wrong direction. Refer to Phasing Section in general
information section. Check blower drive belt tension. Check
bearing lubrication. If it requires lubrication, grease it.
6.
Check the unit supply air (CFM).
7.
Measure evaporator fan motor amp draw.
a.
b.
Upon a call for first stage heat by the thermostat, the heater
contactor will be energized. After completing the specified
fan on delay for heating, the UCB will energize the blower
motor. If the second stage of heat is required, second heater
contactor will be energized. After completing the specified
fan on delay for heating, the UCB will energize the blower
motor.
The thermostat will cycle the electric heat to satisfy the
heating requirements of the conditioned space.
After installation has been completed :
8.
Set the room thermostat fan switch to off.
HEATING OPERATION ERRORS
9.
Turn unit electrical power off.
TEMPERATURE LIMIT
OPERATING INSTRUCTIONS
If the UCB senses zero volts from the high temperature limit,
the indoor blower motor is immediately energized. This limit is
monitored regardless of unit operation status, i.e. the limit is
monitored at all times. If the temperature limit opens three times
within one hour, it will lock on the indoor blower motor and a
flash code is initiated (See Table 10).
1.
Turn unit electrical power on.
2.
Set the room thermostat setting to lower than the room
temperature.
3.
First stage compressors will energize after the built in time
delay (five minutes).
SAFETY CONTROLS
4.
The second stage of the thermostat will energize second
stage compressor if needed.
The unit control board monitors the temperature limit switch
of electric heat units. The control circuit includes the following
safety controls :
POST START CHECK LIST
Temperature Limit Switch (AUTO)
This control is located inside the heater compartment and is
set to open at 120°F. It resets automatically. The limit switch
operates when a high temperature condition, caused by
inadequate supply air flow occurs, thus shutting down the heater
and energizing the blower.
•
RESET
1.
Verify proper system pressures for both circuits.
2.
Measure the temperature drop across the evaporator coil.
3.
Measure the system Amperage draw across all legs of 3
phase power wires.
4.
Measure the condenser fan amp draw.
SHUT DOWN
1.
Set the thermostat to highest temperature setting.
Remove the call for cooling, by raising thermostat setting higher
than the conditioned space temperature. This resets any pressure
or freezestat flash codes.
2.
Turn off the electrical power to the unit.
•
All units have belt drive single speed blower motors. The variable
pitch pulley on the blower motor can be adjusted to obtain the
desired supply air CFM.
FLASH CODES
The UCB will initiate a flash code associated with errors within
the system. Refer to UNIT CONTROL BOARD FLASH CODES Table
10.
BELT DRIVE BLOWER
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 20
TROUBLE SHOOTING
5.
If blower contactor is not pulled in, check for 24 volts at the
contactor coil. If 24 volts are present but it is not pulled in,
replace the contactor.
6.
Failing the above, if there is line voltage supplied at
contactor and it is pulled in, and the supply air blower motor
still does not operate, replace the motor.
7.
If 24 volts is not present at blower contactor, check that 24
volts is present at the UCB supply air blower motor terminal,
“FAN”. If 24 volts is present at the FAN, check for loose
wiring between the UCB and blower contactor.
8.
If 24 volts is not present at the “FAN” terminal, check for 24
volts from the room thermostat. If 24 volts are not present
from the room thermostat, check for the following :
COOLING TROUBLE SHOOTING GUIDE
WARNING
TROUBLESHOOTING OF COMPONENTS MAY REQUIRE OPENING
THE ELECTRICAL CONTROL BOX WITH THE POWER CONNECTED
TO THE UNIT. USE EXTREME CARE WHEN WORKING WITH LIVE
CIRCUITS! CHECK THE UNIT NAMEPLATE FOR THE CORRECT LINE
VOLTAGE AND SET THE VOLTMETER TO THE CORRECT RANGE
BEFORE MAKING ANY CONNECTIONS WITH LINE TERMINALS.
Troubleshooting of components may require opening the
electrical control box with the power connected to the unit. Use
extreme care when working with live circuits! Check the unit
nameplate for the correct line voltage and set the voltmeter
to the correct range before making any connections with line
terminals.
When not necessary, shut off all electric power to the unit prior
to any of the following maintenance procedures so as to prevent
personal injury.
9.
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING
CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND
DANGEROUS OPERATION, WHICH COULD CAUSE INJURY
TO PERSON AND/OR DAMAGE UNIT COMPONENTS. VERIFY
PROPER OPERATION AFTER SERVICING.
NOTE : 2nd stage of cooling is available only in DMS 150.
Turn the thermostat fan switch to the ON position. If the
supply air blower motor does not energize, go to Step 3.
2.
If the blower motor runs with the fan switch in the ON
position but will not run after the first compressor has
energized when the fan switch is in the AUTO position,
check the room thermostat for contact between R and G in
the AUTO position during calls for cooling.
3.
4.
If the supply air blower motor does not energize when the
fan switch is set to ON, check that line voltage is being
supplied to the blower contactor, and that the contactor is
pulled in. Check for loose wiring between the contactor and
the supply air blower motor.
If blower contactor is pulled in and voltage is supplied to
contactor, lightly touch the supply air blower motor housing.
If it is hot, the motor may be off on internal protection.
Cancel any thermostat calls and set the fan switch to AUTO.
Wait for the internal overload to reset. Test again when cool.
Proper operation of the room thermostat (contact
between R and G with the fan switch in the ON position
and in the AUTO position during operation calls),
b.
Proper wiring between the room thermostat and the
UCB, and
c.
Loose wiring from the room thermostat to the UCB.
If 24 volts is present at the room thermostat but not at the
UCB, check for proper wiring between the thermostat and
the UCB, i.e. that the thermostat G terminal is connected to
the G terminal of the UCB, and for loose wiring.
10. If the thermostat and UCB are properly wired, replace the
UCB.
On calls for cooling, the supply air blower motor is operating but
compressor # 1 is not (the room thermostat fan switch is in the
“AUTO” position).
1.
If compressor # 1 does not energize on a call for cooling,
check for line voltage at the compressor contactor 1, and
that the contactor is pulled in. Check for loose wiring
between the contactor and the compressor.
2.
If compressor contactor 1 is pulled in and voltage is
supplied, lightly touch the compressor housing. If it is hot,
the compressor may be off on inherent protection. Cancel
any calls for cooling and wait for the internal overload to
reset. Test again when cool.
3.
If compressor contactor 1 is not pulled in, check for 24 volts
at the coil. If 24 volts are present and contactor is not pulled
in, replace the contactor.
4.
Failing the above, if voltage is supplied at compressor
contactor 1, it is pulled in, and the compressor still does not
operate, replace the compressor.
5.
If 24 volts is not present at compressor contactor 1, check
for 24 volts at the UCB terminal, C1. If 24 volts is present,
check for loose wiring between C1 and the compressor
contactor.
6.
If 24 volts is not present at the C1 terminal, check for 24
volts from the room thermostat at the UCB Y1 terminal. If 24
* On calls for cooling, if the compressors are operating but the
supply air blower motor does not energize after a short delay
(the room thermostat fan switch is in the “AUTO” position).
1.
a.
* Applicable only to DMS 150
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 21
volts is not present from the room thermostat, check for the
following :
7.
8.
•
24 volts at the thermostat Y1 terminal.
•
Proper wiring between the room thermostat and the
UCB, i.e. Y1 to Y1, Y2 to Y2.
•
Loose wiring from the room thermostat to the UCB.
If 24 volts is present at the UCB Y1 terminal, the compressor
may be out due to an open high pressure switch, low
pressure switch, or freezestat. Check for 24 volts at the
HPS1, LPS1, and FS1 terminals of the UCB. If a switch has
opened, there should be a voltage potential between the
UCB terminals, e.g. if LPS1 has opened, there will be a 24
volt potential between the LPS1 terminals.
3.
If compressor contactor 2 is not pulled in, check for 24 volts
at the compressor contactor coil. If 24 volts is present and
compressor contactor is not pulled in, replace the contactor.
4.
Failing the above, if voltage is supplied at compressor
contactor 2, and it is pulled in, and the compressor still does
not operate, replace the compressor.
5.
If 24 volts is not present at compressor contactor 2, check
for 24 volts at the UCB terminal, C2. If 24 volts are present,
check for loose wiring between C2 and the compressor
contactor.
6.
If 24 volts is not present at the C2 terminal, check for 24
volts from the room thermostat at the UCB Y2 terminal. If 24
volts is not present from the room thermostat, check for the
following :
If 24 volts is present at the UCB Y1 terminal and none of
the protection switches have opened, the UCB may have
locked out the compressor for repeat trips. The UCB should
be flashing an alarm code. If not, press and release the
ALARMS button on the UCB. The UCB will flash the last five
alarms on the LED. If the compressor is locked out, cancel
any call for cooling. This will reset any compressor lock outs.
If 24 volts is present at the UCB Y1 terminal and none of the
switches are open and the compressor is not locked out, the
UCB may have the compressor in an ASCD. Check the LED
for an indication of an ASCD cycle. The ASCD should time
out within 5 minutes. Press and release the TEST button to
reset all ASCDs.
24 volts at the thermostat Y2 terminal.
•
Proper wiring between the room thermostat and the
UCB, i.e. Y1 to Y1, Y2 to Y2.
•
Loose wiring from the room thermostat to the UCB.
7.
If 24 volts is present at the UCB Y2 terminal, the compressor
may be out due to an open high pressure switch, low
ressure switch, or freezestat. Check for 24 volts at the HPS2,
LPS2, and FS2 terminals of the UCB. If a switch has opened,
there should be a voltage potential between the UCB
terminals, e.g. if LPS2 has opened, there will be 24 volts of
potential between the LPS2 terminals.
8.
If 24 volts is present at the UCB Y2 terminal and none of
the protection switches have opened, the UCB may have
locked out the compressor for repeat trips. The UCB should
be flashing a code. If not, press and release the ALARMS
button on the UCB. The UCB will flash the last five alarms
on the LED. If the compressor is locked out, remove any
call for cooling at the thermostat or by disconnecting the
thermostat wiring at the Y2 UCB terminal. This will reset any
Installation, compressor lock outs.
NOTE : While the above step will reset any lockouts,
compressor # 1 may be held off for the ASCD. See the next
step.
9.
•
10. If none of the above corrected the error, test the integrity of
the UCB. Disconnect the C1 terminal wire and jumper it to
the Y1 terminal. DO NOT jump the Y1 to C1 terminals. If the
compressor engages, the UCB has faulted.
11. If none of the above correct the error, replace the UCB.
* On calls for the second stage of cooling, the supply air blower
motor and compressor # 1 are operating but compressor # 2 is
not (the room thermostat fan switch is in the “AUTO” position).
NOTE : While the above step will reset any lock outs,
compressor # 1 will be held off for the ASCD, and
compressor # 2 may be held off for a portion of the ASCD.
See the next step.
NOTE : 2nd stage of cooling is available only in DMS 150.
9.
1.
2.
Compressor # 2 will not energize simultaneously with
compressor #1 if a call for both stages of cooling is received.
The UCB delays compressor # 2 by 30 seconds to prevent
a power surge. If after the delay compressor # 2 does
not energize on a second stage call for cooling, check for
line voltage at the compressor contactor 2, and that the
contactor is pulled in. Check for loose wiring between the
contactor and the compressor.
If compressor contactor 2 is pulled in and voltage is
supplied, lightly touch the compressor housing. If it is hot,
the compressor may be off on inherent protection. Cancel
any calls for cooling and wait for the internal overload to
reset. Test again when cool.
* Applicable only to DMS 150
If 24 volts is present at the UCB Y2 terminal and none of the
switches are open and the compressor is not locked out, the
UCB may have the compressor in an ASCD. Check the LED
for an indication of an ASCD cycle. The ASCD should time
out within 5 minutes. Press and release the TEST button to
reset all ASCDs.
10. The UCB can be programmed to lock out compressor
operation during free cooling and in low ambient conditions.
These options are not enabled by default. Local distributors
can test the UCB for this programming.
11. If none of the above corrected the error, test the integrity of
the UCB. Disconnect the C2 terminal wire and jumper it to
the Y2 terminal. DO NOT jump the Y2 to C2 terminals. If the
compressor engages, the UCB has faulted.
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 22
12. If none of the above correct the error, replace the UCB.
* On a call for cooling, the supply air blower motor and
compressor # 2 are operating but compressor # 1 is not (the
room thermostat fan switch is in the “AUTO” position).
NOTE : 2nd stage of cooling is available only in DMS 150.
1.
Compressor # 2 is energized in place of compressor # 1
when compressor # 1 is unavailable for cooling calls. Check
the UCB for alarms indicating that compressor # 1 is locked
out. Press and release the ALARMS button if the LED is not
flashing an alarm.
2.
Check for line voltage at the compressor contactor 1,
and that the contactor is pulled in. Check for loose wiring
between the contactor and the compressor.
3.
If compressor contactor 1 is pulled in and voltage is supplied
at the contactor 1, lightly touch the compressor housing. If
it is hot, the compressor may be off on inherent protection.
Cancel any calls for cooling and wait for the internal
overload to reset. Test again when cool.
4.
5.
6.
7.
8.
9.
If compressor contactor 1 is not pulled in, check for 24 volts
at the coil. If 24 volts is present and compressor contactor 1
is not pulled in, replace the contactor.
Failing the above, if voltage is supplied at compressor
contactor 1, and it is pulled in, and the compressor still does
not operate, replace the compressor.
If 24 volts is not present at compressor contactor, check for
24 volts at the UCB terminal, C1. If 24 volts is present, check
for loose wiring between C1 and the compressor contactor
1.
If 24 volts is not present at the C1 terminal, check for 24
volts from the room thermostat at the UCB Y1 terminal. If 24
volts are not present at the UCB Y1 terminal, the UCB may
have faulted. Check for 24 volts at the Y1 ECON terminal. If
24 volts is not present at Y1 “ECON”, the UCB has faulted.
The UCB should de-energize all compressors on a loss of
call for the first stage of cooling, i.e. a loss if 24 volts at the
Y1 terminal.
IIf 24 volts are present at the UCB Y1 terminal, the
compressor may be out due to an open high-pressure
switch, low-pressure switch, or freezestat. Check for 24
volts at the HPS1, LPS1, and FS1 terminals of the UCB. If a
switch has opened, threshold be a voltage potential between
the UCB terminals, e.g. if LPS1 has opened, there will be a
24- volt potential between the LPS1 terminals.
* NOTE : While the above step will reset any lock outs,
compressor # 2 will be held off for the ASCD, and
compressor # 1 may be held off for a portion of the ASCD.
See the next step.
10. If 24 volts is present at the UCB Y1 terminal and none of the
switches are open and the compressor is not locked out, the
UCB may have the compressor in an ASCD. Check the LED
for an indication of an ASCD cycle. The ASCD should time
out within 5 minutes. Press and release the TEST button to
reset all ASCDs.
11. If 24 volts is present at the UCB Y1 terminal and the
compressor is not out due to a protective switch trip, repeat
trip lock out, or ASCD, the economizer terminals of the UCB
may be improperly wired. Check for 24 volts at the Y1 “OUT”
terminal of the UCB. If 24 volts is present, trace the wiring
from Y1 “OUT” for incorrect wiring. If 24 volts is not present
at the Y1 “OUT” terminal, the UCB must be replaced.
12. If none of the above corrected the error, test the integrity of
the UCB. Disconnect the C1 terminal wire and jumper it to
the Y1 terminal. DO NOT jump the Y1 to C1 terminals. If the
compressor engages, has faulted.
13. If none of the above correct the error, replace the UCB.
UNIT FLASH CODES
Various flash codes are utilized by the unit control board (UCB) to
aid in troubleshooting. Flash codes are distinguished by the short
on and off cycle used (approximately 200 ms on and 200 ms off).
To show normal operation, the control board flashes a 1 second
on, 1 second off heartbeat during normal operation. This is to
verify that the UCB is functioning correctly.
Do not confuse this with an error flash code. To prevent
confusion, a 1-flash, flash code is not used. Current alarms are
flashed on the UCB LED. Pressing and releasing the ALARMS
button on the UCB can check the alarm history. The UCB will
cycle through the last five (5) alarms, most recent to oldest,
separating each alarm flash code by approximately 2 seconds.
In some cases, it may be necessary to “zero” the ASCD for the
compressors in order to perform troubleshooting.
To reset all ASCDs for one cycle, press and release the UCB TEST
button once. See page 23 for table 10, Unit Flash Codes.
If 24 volts is present at the UCB Y1 terminal and none of
the protection switches have opened, the UCB may have
locked out the compressor for repeat trips. The UCB should
be flashing a code. If not, press and release the ALARMS
button on the UCB. The UCB will flash the last five alarms on
the LED. If the compressor is locked out, remove any call for
cooling. This will reset any compressor lock outs.
* Applicable only to DMS 150
Installation, Operation & Maintenance Manual # 036-1009(0608)
Page 23
UNIT FLASH CODES
EVERY SIX MONTHS
In addition to the maintenance done every three months :
•
The condenser coils should be cleaned by spraying water
over it at low pressure or with a brush while ensuring that
the fins are not damaged.
•
Check all electrical connections and tighten them if required.
•
Clean all accessible electrical panels of dirt and dust. Before
cleaning the control panels, ENSURE that the electrical
power to the unit is switched off.
EVERY TWELVE MONTHS
In addition to the maintenance done every six months :
Table 10: Unit Flash Codes
MAINTENANCE
The Saber Packaged Air Conditioners are premium quality
machines with very low maintenance requirements. Compressors
used in Saber Packaged Units are of hermetic reciprocating
type and are charged with the correct amount of refrigerant and
lubricating oil. Unless there is a leak in the system, no topping up
is generally required. All bearings used in the fan shaft, fan motor
and evaporator fan motor are permanently lubricated for life.
Lubrication is therefore not a part of the periodic maintenance
schedule.
EVERY MONTH
•
Remove the filters and blow compressed air over them to
get rid of loose dust. Visually inspect the filter conditions,
replace them with new ones of same sizes if required.
•
Saber Packaged Air Conditioners are provided with a
specially designed drain pan, for proper maintenance check
and clean blockages at drain connections if any.
EVERY THREE MONTHS
In addition to the monthly maintenance above, check the belt
tension of evaporator fan. A correct tension is indicated when
the belt has a relaxation of approximately 10 mm to 13 mm when
pressed lightly with a finger.
•
Use a proper cleaning cloth to clean fan blades and motors.
•
Ensure that the unit is working properly by checking, current,
voltages, pressures and temperatures.
•
Check the earthing or grounding of the unit.
•
Check the exterior of the unit for any signs of corrosion.
Even though it is highly unlikely, if any corrosion that is seen,
should be removed by proper sanding the surface. Repaint
the unit with proper touch up paint, available from York.
•
Check the unit for any unusual vibrations or noise, locate the
cause and rectify it by changing mounts, base isolators etc.,
as required.
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Our triple bottom line of sustainability that is, economic prosperity, environmental stewardship and social
responsibility impacts each and every aspect of our business. York products are now a premier brand
manufactured by Johnson Controls. The acquisition of York, gives us a unique insight into designing HVAC
products that match your exact requirements. We provide solutions for today's most critical concerns energy efficiency, refrigerant alternatives and indoor air quality.
Johnson Controls has a wide range of York products for residential, light commerial and commercial
applications. Our offering includes package & split air conditioners and heat pumps. In addition, Johnson
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Installation, Operation & Maintenance Manual # 036-1009(0608)
Supersedes IOM 036-1009(0606)
50 Hz
We reserve the right to change in part or in whole the specifications
without prior notice.
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P.O. Box 31065, API World Tower, Sheikh Zayed Road
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Tel +9714 3326050 Fax +9714 3326074