Swastik Aircon

Swastik Aircon
Model Number Nomenclature
19XR
65
65
467
DJ
Description
19XR-High Efficiency
Hermetic Centrifugal
Liquid Chiller
S
52
Motor Voltage Code
52-(380V-3PH-50HZ)
55-(6300V-3PH-50HZ)
Cooler Size
30, 31, 32
35, 36, 37
40, 41, 42
45, 46, 47
50, 51, 52
55, 56, 57
60, 61, 62
65, 66, 67
70, 71, 72
75, 76, 77
80, 81, 82
85, 86, 87
Motor Efficiency Code
S JStandard Efficiency
H JHigh Efficiency
Motor Code
CD DC
CE DD
CL DE
CM DF
CN DG
CP DH
CQ DJ
Condenser Size
30, 31, 32
35, 36, 37
40, 41, 42
45, 46, 47
50, 51, 52
55, 56, 57
60, 61, 62
65, 66, 67
70, 71, 72
75, 76, 77
80, 81, 82
85, 86, 87
EH
EJ
EK
EL
EM
EN
EP
Compressor Code
First Digit Indicates Compressor Frame Size
Note:carrier is dedicated to continuous product development.Components list will vary to meet different demands
1
19XR
Features
Designed specifically for chlorine-free HFC-134a refrigerant (the environmentally
preferred HFC-134a refrigerant with zero-ozone-depletion potential)
Chlorine-free
HFC-134a
Chlorine-free HFC-134a
refrigerant protects the
ozone layer.
The positive pressure design reduces the chiller size by up to 35% compared
to low-pressure designs. The smaller size minimizes the need for valuable
mechanical room floor space. In addition, positive-pressure designs eliminate
the need for the costly low-pressure containment devices.
Key chiller components design uses advanced jet engine technology.
Reliability
Several safety measures
greatly improve
operating reliability of
chiller
Aerodynamically contoured impellers - Impellers that use high back sweep
main blades with low-rent and are smaller and lighter than profile intermediate
splitter blades are aerodynamically contoured to improve compressor full-load
and part-load operating efficiency.
Variable inlet guide vanes - The guide vanes are connected with air-water piping,
reducing installation craft-quality cable and controlled by a precise electronic
Efficiency
Key chiller components
design ensures high
efficiency of chiller with
advanced jet engine
technology
actuator. The vanes regulate inlet flow to provide high efficiency through a
wide operating range.
High performance tubing - Tubing with internally and externally enhanced fins
improves chiller performance by reducing the overall resistance to heat transfer.
The newly designed heat exchanger reduces refrigerant charge, cutting
expenses.
Convenience
LCD in English
simplifies the interaction
between
chiller and user
The AccuMeterTM system regulates refrigerant flow according to load conditions,
providing a liquid seal at all operating conditions and eliminating unintentional
hot gas bypass.
The optimized piping design reduces refrigerant flow pressure loss, ensuring
chiller efficiency.
2
19XR
Single-stage design - This increases product reliability by eliminating the
additional moving parts associated with multiple stage chillers.
Refrigerant-cooled oil cooler-Refrigerant cooling eliminates field water piping,
reducing installation expense.
Cooler and condenser are designed and manufactured in accordance with the
Standard of Pressure Vessel of China. The unit isolation valves make the heat
exchangers into a liquid containers and the pump out system is also provided
to output refrigerant, which provides ease of maintenance.
Mix-match capability - The chillers provide a complete line of compressors,
motors and heat exchangers, ensuring the best combination of chiller
components regardless of tonnage, lift, and efficiency specifications.
Water boxes are equipped with standard flanges, which facilitate the field
installation and protect temperature sensor.
International Chiller Visual Control (ICVC) -a large English LCD (liquid crystal
display) features 4 menu-specific soft keys. The default display offers all in one
glance review of key chiller operation data, simplifying the interaction between
chiller and user.
Direct digital Product Integrated Control (PIC II)- Automated controls test can
be executed prior to start-up to verify that the entire control system is functioning
properly. Carrier's PIC II integrates directly with the Carrier Comfort Network
(CCN) via dataport module, providing a system solution to controls applications.
3
19XR
Selection Table
19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR 19XR
3031 3131 3132 4040 4141 5051 5050 5555 5555 6565 6565 7071 7070 7070 7071 8080 7777 8585 8787
327CLS 336CMS 347CNS 356CPS 386CQS 385CQS 447DFS 447DGS 457DHS 467DHS 467DJS 476DJS 545EHS 555EKS 555ELS 585EMS 595ENS 595EPS 505EPS
Model
Nominal kW 1,055 1,231 1,406 1,582 1,758 1,934 2,110 2,285 2,461 2,637 2,813 3,059 3,164 3,516 3,868 4,218 4,571 4,922 5,274
Cooling
Chiller Capacity Tons 300 350 400 450 500 550 600 650 700 750 800 870 900 1000 1100 1200 1300 1400 1500
Full load
ikW/kW 0.199 0.191 0.192 0.190 0.191 0.181 0.191 0.189 0.192 0.182 0.184 0.174 0.177 0.178 0.177 0.175 0.176 0.174 0.170
Performance
Power
380V-3Ph-50Hz
Supply
234
268
299
334
349
400
431
472
479
516
530
558
369
404
484
521
576
601
690
745
817
830
896
919
968 1067 1176 1260 1402 1479 1547
685
693
851
904
904
904 1210 1210 1540 1540 1540 1540 1881 2073 2358 2358 3216 3277 3277
50.4 58.8 67.2 75.6
84
92.4 100.8 109.2 117.6 126 134.4 146.2 151.2 168.1 184.9 201.7 218.5 235.3 252.1
Power kW 208
626
685
735
801
854
897
Motor
Rated
A
Current
Locked Rotor
A
Current
Flow
I/s
Rate
Cooler Pressure kPa
Drop
Nozzle
mm
Size
Flow
Rate I/s
Cond- Pressure
kPa
enser Drop
Nozzle
Size mm
84.1
82 104.3 75.9 76.1 69.6 81.5 104.5 119.5 81.4 91.4 82.1 87.3 105.6 125.5 94.1 137 138.7 121.5
DN200
DN200
DN250
DN350 DN300
DN300
DN350
60.8 70.5 80.6 90.5 100.6 109.9 120.8 130.9 141.2 150.1 160.4 172.9 179.1 199.3 219.1 238.4 258.5 278 296.9
67
87.7 85.8 78.8 78.7 51.9 71.5 92.2 106
DN200
79.9 90.3 63.7 79.9 97.2 98.3 88.4 128.1 129.8 114.1
DN250
DN300
DN350 DN300 DN350
Length mm 4172 4172 4172 4365 4365 4460 4460 4980 4980 5000 5000 5156 5156 5156 5156 5200 5766 5810 5810
DimenWidth mm 1707 1707 1707 1908 1908 2054 2054 2054 2054 2124 2124 2426 2426 2426 2426 2711 2426 2711 2711
sions
Height mm 2073 2073 2073 2153 2153 2137 2207 2207 2207 2261 2261 2750 2985 2985 2985 3029 2985 3029 3029
Operating kg 6442 6594 6733 7804 8061 9143 9587 10325 10373 11633 11633 15134 17158 17221 17527 20109 19699 21621 22775
Weight Rigging kg 5985 6107 6210 6998 7188 8052 8532 9173 9221 10183 10183 13139 15239 15301 15533 17522 17296 18813 19650
R134a
Charge kg 277
308
308
381
413
522
522
617
617
694
694
907
907
907
907 1007 1157 1157 1270
Notes: 1. The above selection is made based on the In/Out temperature of CW being 12/7 oC, and that of CDW being 32/37oC; the
fouling factor of cooling water side being 0.0176m2oC/kW, and that of chilled water side being 0.044 m2 oC/kW.
2. Carrier will select specific models using computer on different requests for tonnage, lift, and efficiency. For details, please
contact local agencies.
3. The above selection is made based on the voltage being 380V. For details, please contact local agencies.
4
19XR
Elecrical Date
Motor
Size
CDS
CES
CLS
CMS
CNS
CPS
CQS
Motor Electrical
Characteristics
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
Motor Motor Electrical
Characteristics
Size
EHS
EJS
EKS
ELS
EMS
ENS
EPS
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
380V Electrical Data
Max Ikw(kw)
199
219
243
267
295
323
360
Amps(A)
341
620
1952
374
620
1952
422
784
2461
449
694
2167
522
851
2660
551
904
2824
606
904
2824
380V Electrical Data
Max Ikw(kw)
603
646
692
746
809
876
931
Motor
Size
Amps(A)
DCS
DDS
DES
DFS
DGS
DHS
DJS
Motor
Size
1028
1889
5993
1102
2175
6903
1151
2082
6635
1256
2368
7531
1354
2368
7531
1512
3224
9973
1588
3293
10454
EHH
EJH
EKH
ELH
EMH
ENH
EPH
Motor Electrical
Characteristics
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
Motor Electrical
Characteristics
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
RLA
LRYA
LRDA
380V Electrical Data
Max Ikw(kw)
366
394
416
449
485
528
597
5
19XR
597
917
2990
643
974
2136
674
1197
3891
728
1199
3903
786
1332
4335
856
1483
4821
968
1365
4457
380V Electrical Data
Max Ikw(kw)
608
651
696
754
817
883
941
Notes: 1. Legend: RLA-Rated Load Amps, LRYA-Locked Rotor Y Amps, LRDA-Locked Rotor Delta Amps.
2. For other details, please contact local agencies.
Amps(A)
Amps(A)
61
338
65
397
70
426
75
467
81
465
88
586
94
586
Chiller Dimensions
Tube Removal
Clearance for
Either End
Motor Service
Clearance 1219mm
Recommended Overhead Service Clearance
915mm(Frame 3-4 Compressor)
1524mm(Frame 5 Compressor)
C
Min 362 mm
A
B
Service Clearance
Min 610 mm
Heat Exchanger Size
A-Length
mm(2 passes)
B-Width
mm
C-Height
mm
D-Tube Removal Space for Either End
mm
30 ~ 32
4172
1707
2073
3747
35 ~ 37
4693
1707
2073
4343
40 ~ 42
4365
1908
2153
3747
45 ~ 47
4885
1908
2153
4343
50 ~ 52
4460
2054
2207
3747
55 ~ 57
4980
2054
2207
4343
60 ~ 62
4480
2124
2261
3747
65 ~ 67
5000
2124
2261
4343
70 ~ 72
5156
2426
2985
4267
75 ~ 77
5766
2426
2985
4877
80 ~ 82
5200
2711
3029
4267
85 ~ 87
5810
2711
3029
4877
Notes: 1.A-length includes flanges with both cooler and condenser having two passes and nozzles being at the same end
(compressor end for standard units)
2. The above dimensions are based on the waterside pressure being 1.0Mpa. A-length will vary while the waterside pressure increases.
Starter Dimensions
(380V-3Ph-50Hz )
Starter Type
Rated Current(A)
Width(mm)
Depth(mm)
Height(mm)
Y- 620
620 ~ 950
950 ~ 1560
1000
1000
1000
600
600
800
2000
2000
2000
Y- Y- Notes: The wiring of starter enters and exits from the bottom.
6
19XR
Nozzle Dimensions
Frame 3
Frame 4-8
Drive End (Type A)
Compressor End (Type B)
For C of Cooler Waterbox: 5 in and 6 out
For R of condenser Water box:7 in and 8 out
For D of Cooler Waterbox: 3 in and 4 out
For S of condenser Water box:1 in and 2 out
(mm)
Heat Exchanger Size
Frame 3
30 ~ 32
35 ~ 37
Heat Exchanger Size
Frame 4
Frame 5
Frame 6
Frame 7
Frame 8
40 ~ 42
45 ~ 47
50 ~ 52
55 ~ 57
60 ~ 62
65 ~ 67
70 ~ 72
75 ~ 77
80 ~ 82
85 ~ 87
A
B
C
D
E
F
G
H
ØP
635
895
410
679
213
152
381
454
DN200
A
B
C
D
ØE
ØF
H
I
627
995
499
867
DN200
DN200
940
464
736
1168
482
850
DN200
DN250
997
489
788
1220
489
921
DN250
DN250
1048
521
1047
1555
807
1315
DN300
DN300
1213
610
1062
1620
757
1315
DN350
DN350
1356
678
Notes: 1. Nozzles of standard units are at the compressor end (Type B). Type A is also available on request.
2. The above dimensions are based on the waterside pressure being 1.0Mpa. Dimensions will vary while the waterside
pressure increases.
7
19XR
Typical Piping and Wiring
1 Air Switch
2 Freestanding Compressor Motor Starter
3
Compressor Motor Terminal Box
4 Oil Pump Controller
6 Vents
7 Pressure Gauges
8
Chilled Water Pump
9 Cooling Water Pump
11 Cooling Water Pump Starter 12 Cooling Tower Fan Starter
Line
1#
13 Air Switch
5 Control Panel
10 Chilled Water Pump Starter
14 Oil Pump Switch
Purpose
Specification
Main power to Starter:
380V AC: 3 phases, 1 neutral, and 1grounding
Or 6300V AC: 3 phases, 1 grounding (medium voltage)
4#
To Cooling Tower Fan Starter:
5#
To Cooling Tower Water Pump Starter: 2 control lines (optional)
6#
To Chilled Water Pump Starter:
2 control lines (optional)
7#
To Oil Heater Contactor:
115V AC: 2 power lines, 1 grounding
8#
To Oil Pump Contactor:
380V AC power line, 3 phases 5A
#
To Lube System Power Panel:
8 control shielding lines, 600V, 80oC, grounding in starter
#
To Motor:
380V AC: 6 leads (Minimum ampacity per conductor = 0.721 x RLA), 2 grounding
9
10
2 control lines (optional)
Or 6300V AC: 3 leads, 1 grounding (medium voltage)
Piping and Wiring Requirements:
1. The installer must get all pipes and wires in place and mark the ends.
2. Filter must be installed in cooling water and chilled water pipes.
3. Thermometer (0-50oC) and pressure gauge (0~1Mpa or 2MPa) must be installed at inlet and outlet of the pipes.
4. The installer must install the relief valve vent to outdoors with a steel pipe.(outer diameter 42mm, thickness 4mm)
5. It is suggested that an oxygen content monitor be installed in the machine room for safety, which will give an alarm when
the oxygen content is less than 19.5%.
8
19XR
Types of Base Isolation
Location Of Isolator
Condenser Center
Accessory
Soleplate
Cooler Center
Standard Isolation
Support
Plate
See Note # 1
Tube Sheet
Support Plate
Jacking Screw
See Note#2
Elastomeric Pad
Level Base Line
Jacking Screw(s)
THK(25)H.R.S.
Soleplate
See Note#3
Soleplate
Leveling Pad
Leveling Pad(s)
View X-X
Simplified Isolation
Notes:
Tube Sheet
Support Plate
1. Accessory soleplate package includes 4 soleplates,
Elastomeric Pad
2. Jacking Screws should be removed after the grout
16 jacking screws, and 16 leveling pads.
has set
3. Thickness of grout will vary, depending on the
amount necessary to level chiller.
View Y-Y
Heat Exchanger Size
Frame 3
Frame 4
Frame 5
Frame 6
Frame 7
Frame 8
30~32
35~37
40~42
45~47
50~52
55~57
60~62
65~67
70~72
75~77
80~82
85~87
A
3931
4451
3931
4451
3931
4451
3931
4451
4620
5230
4620
5230
B
1632
1632
1829
1829
1969
1969
2070
2070
2400
2400
2686
2686
C
92
92
92
92
92
92
92
92
176
176
176
176
D
387
387
387
387
387
387
387
387
559
559
559
559
9
19XR
E
229
229
229
229
229
229
229
229
406
406
406
406
F
540
540
540
540
540
540
540
540
711
711
711
711
G
464
464
464
464
464
464
464
464
635
635
635
635
H
254
254
254
254
254
254
254
254
432
432
432
432
J
178
178
178
178
178
178
178
178
356
356
356
356
Option Specifications
Waterside Pressure of condenser:
the standard pressure is 1.0Mpa. 2.0Mpa is also available if necessary.
Waterside Pressure of cooler:
the standard pressure is 1.0Mpa. 2.0Mpa is also available if necessary.
Spring Isolator:
the standard isolator is made of elastomeric rubber. Spring Isolator is also available for further
isolation if necessary.
Noise Reduction Covering for Vent-pipe:
this helps reduce the noise by 1~2dB (A)
(For details, please contact local agencies.)
Dimension Selection
for Selected Model
19XR Centrifugal Chillers can be configured according to customers' requirements. Dimensions
of chiller, piping and base correspond to the heat exchanger and can be identified in the table
listed in the catalog. Take as an example 19XR4142386CQS, of which the size of cooler and
condenser is 41 and 42 respectively:
See Chiller Dimension Table on Page 6, the Heat Exchanger 40~42 Line for length, width, height of the chiller as follows:
Heat Exchanger Size
A-Length
mm
B-Width
mm
C-Height
mm
D-Tube Removal Space
mm
40 ~ 42
4365
1908
2153
3747
See Nozzle Dimensions Table on Page 7, the Heat Exchanger 40~42 Line for dimensions of main nozzles and flanges as follows:
Heat Exchanger Size
A
B
C
D
40 ~ 42
627
995
499
867
ØE
DN200
ØF
DN200
H
I
940
464
See Base Dimensions Table on Page 9, the Heat Exchanger 40~42 Line for base dimensions as follows:
Heat Exchanger Size
C
D
E
F
G
A
B
H
J
92
178
40 ~ 42
3931
1829
387
10 19XR
229
540
464
254
Microprocessor
Controls
Microprocessor controls provide the safety, interlock, and indications necessary to operate the chiller in a
safe and efficient manner. In addition, the program logic ensures proper starting, stopping, and recycling of
the chiller and provides a communication link to the Carrier Comfort Network (CCN).
The microprocessor control on each Carrier centrifugal system is factory mounted, wired, and tested to
ensure machine protection and efficient capacity control.
Control system
Safety cutouts
Display
LCD with Language Pre-programmed for Chinese
Bearing Oil High Temperature*
Chiller Operation Status Message
Component Test and Diagnostic Check
Motor High Temperature*+
Power-On
Programmable Recycle Allows Chiller to Recycle at
Refrigerant (Condenser) High Pressure*+
Pre-Start Diagnostic Check
Refrigerant (Cooler) Low Pressure*+
Compressor Motor Amps
Lube Oil Low Pressure
Pre-Alarm Alert++
Compressor (Refrigerant) Discharge Temperature*
Alarm
CCN Compatible
Under Voltage**
Contact for Remote Alarm
Primary and Secondary Status Message
Over Voltage**
Safety Shutdown Messages
Individual Start/Stop Schedules for Local and CCN
Oil Pump Motor Overload
Elapsed Time (Hours of Operation)
Cooler and Condenser Water Flow
Chiller Input kW
Optimum Loads for Decreased Operating Costs
Menu-Driven Keypad Interface for Status Display, Set
Point Control, and System Configuration
Operation Modules
Recall of Up to 25 Alarm/Alert Messages with
Diagnostic Help
Two Chiller Lead/Lag with Third Chiller Standby is
Standard in the PIC II Software
Optional Soft Stop Unloading Closes Guide Vanes to
Unload the Motor to the Configured Amperage Level
Prior to Stopping
Motor Overload+
Motor Acceleration Time
Intermittent Power Loss
Compressor Starter Faults
Compressor Surge Protection*
Low Level Ground Fault
Low Level-phase to phase and phase to ground
Capacity Control
Leaving Chilled Water Control
Entering Chilled Water Control
Soft Loading Control by Temperature or Load
Ramping
Guide Vane Actuator Module
Hot Gas Bypass Valve
Power (Demand) Limiter
Interlocks
Manual/Automatic Remote Start
Starting/Stopping Sequence
Pre-lube/Post-Lube
Notes:
Pre-Flow/Post-Flow
These can be configured by users to provide alert indication at user-defined limit.
Compressor Starter Run Interlock
Override Protection: Causes compressor to first unload and then, if necessary, shut down.
Will not require manual reset or cause an alarm if auto-restart after power failure is enabled.
By display code only.
Pre-Start Check of Safeties and Alerts
Low Chilled Water (Load) Recycle
Monitor/Number Compressor Starts and Run Hours
Manual Reset of Safeties
11 19XR
Wiring
!"
Field
19XR Typical Field Wiring With Free-Standing Starter (380V-3Ph-50HZ)
12 19XR
!
!"
!"
!
13 19XR
Field Wiring
19XR Typical Field Wiring With Free-Standing Starter (Medium Voltage)
14 19XR
15 19XR
Field Wiring Specifications
General
1. Starters shall be designed and manufactured in accordance with Carrier Engineering Requirement Z-415.
2. All field-supplied conductors, devices, and the field-installation wiring, termination of conductors and devices, must
be in compliance with all applicable codes and job specifications.
3. The routing of field-installed conduit and conductors and the location of field-installed devices must not interfere with
equipment access or the reading, adjusting, or servicing of any component.
4. Equipment installation and all starting and control devices, must comply with details in equipment submittal drawings
and literature.
5. Contacts and switches are shown in the position they would with the circuit deenergized and the chiller shut down.
6. WARNING - Do not use aluminum conductors.
7. Installer is responsible for any damage caused by improper wiring between starter and machine.
Power Wiring to Starter
1. Circuit breaker is to be used to disconnect power to starter.
2. Unit-mounted starter power conductor rating must meet minimum nameplate voltage and compressor motor RLA.
3. Lug adapters may be required if installation conditions dictate that conductors be sized beyond the minimum ampacity
required.
4. Flexible conduit should be used for the last few feet of the power conductor to start enclosure to provide unit vibration
isolation.
5. Compressor motor and controls must be grounded by using equipment-grounding lugs provided inside unit mounted
starter enclosure.
6. Unit-mounted starters with "Rated Load Amps" (RLA) greater than 700 RLA (Benshaw) or 935 RLA (Cutler Hammer)
require the assembly and the installation of a "Top Hat" (located inside enclosure) to provide the required wire
bending space for incoming power leads.
Control Wiring
1. Field supplied control conductors should be at least 1 mm2 or larger.
2. Optional ice build start/terminate device contacts, optional remote start/stop device contacts and optional spare
safety device contacts, must have 24 VAC rating. MAX current is 60 MA, nominal current is 10 MA. Switches with
gold plated bifurcated contacts are recommended.
3. Remove jumper wire between J2-1 and J2-2 before connecting auxiliary safeties between these terminals.
4. ISM contact outputs can control cooler and condenser pump and tower fan motor contactor coil loads (VA) rated 5
Amps at 115 VAC up to 3 Amps at 277 VAC. Do not use starter control transformer as the power source for contactor
coil loads.
5. Do not route control wiring carrying 30 v or less within a conduit which has wires carrying 50 v or higher or along side
wires carrying 50 v or higher.
6. Control wiring between free-standing starter and power panel must be separate shielded cables with minimum rating
of 600 v, 80°C ground shield at starter.
7. If optional oil pump circuit breaker is not supplied within the starter enclosure as shown, it must be located within sight
of the chiller with wiring routed to suit.
16 19XR
Power Wiring Between Free-Standing Starter and Compressor Motor
1. Low voltage (600 v or less) compressor motors have (6) 5/8 terminal studs (lead connectors not supplied by
Carrier). Either 3 or 6 conductors must be run between compressor motor and starter, depending on the type of
motor starter employed. If only 3 leads are utilized, jumper motor terminals as follows : 1 to 6, 2 to 4, and 3 to 5.
Center to center distance between terminals is 8mm.Compressor motor starter must have nameplate stamped as
to conform with Carrier Engineering Requirement Z-415.
2. Medium voltage [over 600 volts] compressor motors have (3) terminals. Connections are 9/16-threaded
stud. Compressor motor starter must have nameplate stamped as to conform with Carrier Engineering
requirement "Z-415."
3. Power conductor rating must meet compressor motor RLA.
When (3) conductors are used:
Minimum ampacity per conductor = 1.25 x compressor RLA
When (6) conductors are used:
Minimum ampacity per conductor = 0.721 x compressor RLA
4. When more than one conduit is used to run conductors from starter to compressor motor terminal box, three leads
from each phase (conductor) must be in each conduit to prevent excessive heating (e.g., conductors to motor
terminals 1, 2, & 3 in one conduit, and those to 4, 5, & 6 in another).
5. Compressor motor power conductors may enter terminal box through top, bottom or right side using holes cut by
contractor to suit conduit. Flexible conduit should be used for the last few feet to the terminal box for unit vibration
isolation.
6. Compressor motor frame should be grounded in accordance with the National Electrical Code (NFPA-70) and applicable
codes. Means for grounding compressor motor is a #4 AWG-500 MCM pressure connector, supplied and located in
the lower left side corner of the compressor motor terminal box.
7. Do not allow motor terminals to support weight of wire cables. Use cable supports and strain relieves as required.
8. Use backup wrench when tightening lead connectors to motor terminal studs. Torque to 45 lb-ft max.
9. Motor terminals and wire connectors must be insulated with insulation putties and tapes attached to chillers to
prevent moisture condensing and electrical arc.
17 19XR
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