Installation, and Maintenance Manual
Water-Cooled Scroll Compressor Chillers
WGZ 030CW to WGZ 200CW, Packaged Water-Cooled Chiller
WGZ 030CA to WGZ 200CA, Chiller with Remote Condenser
30 to 200 Tons, 105 to 700 kW
60 Hz, R-410A
IMM WGZC
Group: Chiller
Part Number: 331975201
Effective: October 2008
Supercedes: June 2008
Table of Contents
r
Introduction.......................................3
Nomenclature........................................3
Installation .........................................4
Vibration Isolators................................. 6
Water Piping ....................................10
Flow Switch ........................................ 13
Glycol Solutions.................................. 13
Condenser Water Piping...................... 15
Pressure Drops.................................15
Refrigerant Piping...........................
Unit with Remote Condenser.............. 18
Factory-Mounted Condenser............... 23
Dimensions.......................................
Packaged Chillers................................ 24
Chillers with Remote Condenser......... 27
Physical Data....................................30
Packaged Chillers................................ 30
Chillers with Remote Condenser......... 33
Operating Limits ................................. 34
Components ........................................ 35
Wiring...............................................36
Unit Configuration..........................37
Electrical Data .................................38
18
24
Field Wiring Diagram ......................... 53
Control Panel Layout .......................... 55
Motor Protection Module....................55
Start-Up and Shutdown..................
Pre Start-up.......................................... 56
Start-up................................................ 56
Weekend or Temporary Shutdown...... 57
Start-up after Temporary Shutdown.... 57
Extended Shutdown ............................ 57
Start-up after Extended Shutdown...... 58
System Maintenance....................... 59
General................................................ 59
Electrical T erm inals.............................60
Compressor Lubrication ...................... 60
Sightglass and Moisture Indicator....... 60
Crankcase Heaters............................... 61
Optional Controls................................ 61
Phase/Voltage Monitor (Optional) ...... 61
Hot Gas Bypass (Optional) ................. 62
Maintenance Schedule.................... 63
System Service................................. 64
Troubleshooting Chart ........................ 66
Warranty Statement ....................... 67
56
Cover Picture: WGZ 200C, Nominal 200 ton chille
Manufactured in an ISO Certified facility
©2007 McQuay International. Illustrations and data cover the McQuay International product at the time of publication and we reserve the right to
make changes in design and construction at anytime without notice. ™® The following are trademarks or registered trademarks of their respective
companies: BACnet from ASHRAE;
International under a license granted by Echelon Corporation; Compliant Scroll from Copeland Corporation; ElectroFin from AST ElectroFin Inc.;
Modbus from Schneider Electric; FanTrol, MicroTech II, Open Choices, and SpeedTrol from McQuay International
LONMARK, LonTalk, LONWORKS, and the LONMARK logo are managed, granted and used by LONMARK
2 WGZ 030C through 200C IMM WGZC
Introduction
General Description
McQuay Type WGZ water chillers are designed for indoor installations and are available with water-cooled condensers
(Model WGZ-CW), or arranged for use with remote, air-cooled or evaporative condensers (Model WGZ-CA). Each
water-cooled unit is completely assembled and factory wired before evacuation, charging and testing. They consist of
hermetic scroll compressors, brazed-plate evaporators on Models WGZ 030 to 130( shell-and-tube on Models WGZ
150 to 200), water-cooled condenser (WGZ-CW), and complete refrigerant piping.
Units manufactured for use with remote condensers (Models WGZ-CA) have all refrigerant specialties factory-mounted
and connection points for refrigerant discharge and liquid lines.
Liquid line components that are included are manual liquid line shutoff valves, charging valves, filter-driers, liquid line
solenoid valves, sight glass/moisture indicators, and thermal expansion valves.
Other features include compressor crankcase heaters, and a MicroTech II microprocessor controller.
The electrical control center includes all equipment protection and operating controls necessary for dependable
automatic operation.
The compressors are not fused as standard, but can be protected by optional circuit breakers or fuses, or can rely on a
field-installed, fused disconnect switch for protection.
Nomenclature
W G Z 100 - C W
Water-Cooled
Global
Scroll Compressor
Inspection
When the equipment is received, all items should be carefully checked against the bill of lading to be sure of a
complete shipment. All units must be carefully inspected for damage upon arrival. All shipping damage must be
reported to the carrier and a claim must be filed with the carrier. The unit serial plate should be checked before
unloading the unit to be sure that it agrees with the power supply available. Physical damage to unit after acceptance is
not the responsibility of McQuay.
Note: Unit lifting weights are given in the physical data tables beginning on page
are given on page 6
W = Water-Cooled Condenser
A = Unit Less Condenser
Design V intage
Nominal Capacity (Tons)
5. Corner operating weights
IMM WGZC WGZ 030C through 200C 3
Installation
Note: Installation and maintenance are to be performed only by qualified personnel who are familiar with
local codes and regulations, and experienced with this type of equipment.
!
WARNING
Avoid contact with sharp edges. Personal injury can result
Handling
Every model WGZ-CW water chiller with water-cooled condensers is shipped with a full refrigerant charge. For
shipment, the charge is contained in the condenser and is isolated by the condenser liquid shutoff valve and the
compressor discharge valve common to a pair of compressors.
A holding charge is supplied in remote condenser models, WGZ-CA. The operating charge must be field supplied
and charged.
!
WARNING
If the unit has been damaged, allowing the refrigerant to escape, there can be danger of suffocation in the area since the
refrigerant will displace the air. Be sure to review Environmental Protection Agency (EPA) requirements if damage occurred.
Avoid exposing an open flame to the refrigerant
Moving the Unit The skid option is strongly recommended for ease of handling and to help prevent damage if a
crane is not available for rigging at site.
Figure 1, Lifting the Unit
SPREADER BARS MUST
BE USED FOR STABILITY
DURING LIFTING OF
ALL SIZE UNITS
(2) 2”
Lifting
Holes
Removable
Lifting
WGZ150-200C
UNIT SHOWN
331926901 REV. 0A
Bar
It is recommended that all moving and handling be performed with skids or dollies under the unit and that they not
be removed until the unit is in the final location. Never put the weight of the unit against the control box.
In moving, always apply pressure to the base on the skids only and not to the piping or other components. A long
bar will help move the unit easily. Avoid dropping the unit at the end of the roll.
If the unit must be hoisted, lift the unit from the removable lifting arms factory-bolted to each end of the unit
adjacent to the tube sheet by attaching cables or chains to the end of the arms. A spreader bar must be used to
protect the piping, control panel and other areas of the chiller (see
). The arms should be removed and discarded
after use.
4 WGZ 030C through 200C IMM WGZC
Do not attach slings to piping or equipment. Do not attempt to lift the unit by lifting points mounted on the
compressors. They are for lifting only the compressor should one need to be removed from the unit. Move unit in
the upright horizontal position at all times. Set unit down gently when lowering from the truck or rollers.
Table 1, Lifting Loads
Model
WGZ-C
WGZ 030
WGZ 035
WGZ 040
WGZ 045
WGZ 050
WGZ 055
WGZ 060
WGZ 070
WGZ 080
WGZ 090
WGZ 100
WGZ 115
WGZ 130
WGZ 150
WGZ 175
WGZ200
WGZ-CW Package Units (lbs.) WGZ CA Less Condenser Units (lbs)
L1 L2 L3 L4
606 633 599 573 2410 415 430 374 361
632 646 616 603 2496 442 445 392 390
639 659 630 611 2539 443 451 399 392
639 667 639 612 2558 444 460 407 393
655 689 664 631 2639 451 468 416 400
655 698 673 632 2658 451 476 425 402
655 712 688 633 2688 451 484 433 404
929 874 942 1001 3746 649 595 556 606
1066 927 1001 1151 4145 765 635 598 720
1076 849 1059 1343 4327 806 653 623 770
1059 781 1118 1515 4474 829 681 657 801
1054 802 1146 1506 4508 830 710 689 805
1055 828 1181 1505 4568 831 737 716 807
1684 1516 1602 1780 6581 1204 1142 1184 1249
1814 1528 1637 1943 6921 1245 1149 1198 1299
1829 1550 1677 1979 7036 1265 1178 1235 1326
Shipping
Weight
L1 L2 L3 L4
Shipping
Weight
1580
1670
1685
1704
1735
1754
1771
2406
2717
2851
2968
3035
3091
4779
4891
5004
See Figure 2 on the following page for location of lifting points.
Location
WGZ chillers are designed for indoor application and must be located in an area where the surrounding
ambient temperature is 40°F (4°C) or above. A good rule of thumb is to place units where ambient temperatures
are at least 5°F (3°C) above the leaving water temperature.
Because of the electrical control devices, the units should not be exposed to the weather. A plastic cover over
the control box is supplied as temporary protection during shipment. A reasonably level and sufficiently strong
floor is required for the water chiller. If necessary, additional structural members should be provided to transfer
the weight of the unit to the nearest beams.
Space Requirements for Connections and Servicing
The chilled water and condenser water (on units with a water-cooled condenser) piping enters and leaves the
unit from the right side when looking at the control panel. Left-hand condenser connections are an option. A
clearance of at least 3 feet (1219 mm), or more if codes require, should be provided beyond this piping and on
all other sides and ends of the unit for general servicing or for changing the compressors, if it ever becomes
necessary.
IMM WGZC WGZ 030C through 200C 5
On units equipped with a water-cooled condenser (Type WGZ-CW) clearance should also be provided for
cleaning or removal of condenser tubes on one end of the unit. The clearance for cleaning depends on the type
of apparatus used, but can be as much as the length of the condenser (10 feet, 3050 mm). Tube replacement
requires the tube length of 10 feet (3050 mm) plus one to two feet of workspace. This space can often be
provided through a doorway or other opening.
Allow a minimum of 4-foot clearance in front of the control panel.
Placing the Unit
The small amount of vibration normally encountered with the water chiller makes this unit particularly
desirable for basement or ground floor installations where the unit can be mounted directly to the floor. The
floor construction should be such that the unit will not affect the building structure, or transmit noise and
vibration into the structure.
Vibration Isolators
It is recommended that isolators be used on all upper level installations or in areas where vibration transmission
is a consideration.
Figure 2, Isolator Locations
4
LB
1
LF
Control Panel
RB
FRF
3
Wate r
Connections
2
A rubber anti-skid pad should be used under isolators if hold-down bolts are not used.
Installation of spring isolators requires flexible piping connections and at least three feet of flexible electrical
conduit to avoid straining the piping and transmitting vibration and noise.
Transfer the unit as indicated under “Moving the
Unit.” In all cases, set the unit in place and level with
a spirit level. When spring-type isolators are required,
install springs running under the main unit supports.
The unit should be set initially on shims or blocks at
the listed spring free height. When all piping, wiring,
flushing, charging, etc., is completed, the springs are
adjusted upward to loosen the blocks or shims that
are then removed.
Table 2, WGZ-CW Packaged, Mounting Weights & Vibration Mounting Location
Mounting Weights, Lbs
Unit
Size M1 M2 M3 M4 M1 M2 M3 M4
625.0 653.0 618.0 591.0
030
651.0 665.0 635.0 621.0
035
662.0 683.0 653.0 633.0
040
662.0 691.0 662.0 634.0
045
683.0 718.0 692.0 659.0
050
683.0 727.0 702.0 659.0
055
682.0 742.0 717.0 660.0
060
CP-1-28 CP-1-28 CP-1-28 CP-1-28
CP-1-28 CP-1-28 CP-1-28 CP-1-28
CP-1-28 CP-1-28 CP-1-28 CP-1-28
CP-1-28 CP-1-28 CP-1-28 CP-1-28
CP-1-28 CP-1-28 CP-1-28 CP-1-28
CP-1-28 CP-1-28 CP-1-28 CP-1-28
CP-1-28 CP-1-28 CP-1-28 CP-1-28
Spring-Flex Mountings R-I-S Mountings
M1 M2 M3 M4
RP3 RP3 RP3 RP3
Green Green Green Green
Green Green Green Green
Green Green Green Green
Green Green Green Green
Green Green Green Green
Green Green Green Green
Green Green Green Green
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
Continued next page
6 WGZ 030C through 200C IMM WGZC
WGZ-CW Packaged, Mounting Weights & Vibration Mounting Location, Continued
Unit
Size
Mounting Weights, Lbs Spring-Flex Mountings R-I-S Mountings
M1 M2 M3 M4 M1 M2 M3 M4
964.0 907.0 978.0 1038.0
070
1106.0 962.0 1039.0 1195.0
080
1121.0 884.0 1103.0 1399.0
090
1108.0 817.0 1169.0 1585.0
100
1102.0 839.0 1198.0 1574.0
115
1102.0 865.0 1234.0 1572.0
130
1886.0 1697.0 1794.0 1993.0
150
2033.0 1712.0 1835.0 2178.0
170
2047.0 1735.0 1877.0 2215.0
200
CP-1-31 CP-1-31 CP-1-31 CP-1-31
Gray Gray Gray Gray
CP-2-27 CP-2-27 CP-2-27 CP-2-27
Orange Orange Orange Orange
CP-2-27 CP-2-27 CP-2-27 CP-2-28
Orange Orange Orange Green
CP-2-27 CP-2-27 CP-2-27 CP-2-28
Orange Orange Orange Green
CP-2-27 CP-2-27 CP-2-27 CP-2-28
Orange Orange Orange Green
CP-2-27 CP-2-27 CP-2-27 CP-2-28
Orange Orange Orange Green
CP-2-32 CP-2-31 CP-2-31 CP-2-32
White Gray Gray White
CP-2-32 CP-2-31 CP-2-31 CP-2-32
White Gray Gray White
CP-2-32 CP-2-31 CP-2-31 CP-2-32
White Gray Gray White
M1 M2 M3 M4
RP4 RP4 RP4 RP4
Black Black Black Black
RP4 RP4 RP4 RP4
Black Black Black Black
RP4 RP4 RP4 RP4
Red Red Red Red
RP4 RP4 RP4 RP4
Red Red Red Red
RP4 RP4 RP4 RP4
Red Red Red Red
RP4 RP4 RP4 RP4
Red Red Red Red
RP4 RP4 RP4 RP4
Green Green Green Green
RP4 RP4 RP4 RP4
Green Green Green Green
RP4 RP4 RP4 RP4
Green Green Green Green
Table 3, WGZ-CA, Remote Condenser, Mounting Weights & Vibration Mounting Location
Unit Mounting Weights, Lbs Spring-Flex Mountings Spring-Flex Mountings
Size M1 M2 M3 M4 M5 M6 M1 M2 M3 M4 M5 M6
476 501 322 307 N/A N/A
030
511 516 337 334 N/A N/A
035
511 525 344 335 N/A N/A
040
512 538 353 336 N/A N/A
045
520 549 362 342 N/A N/A
050
519 561 371 343 N/A N/A
055
519 574 380 344 N/A N/A
060
738 651 509 577 N/A N/A
070
884 675 532 697 N/A N/A
080
937 690 552 749 N/A N/A
090
963 724 585 778 N/A N/A
100
957. 764 621 778 N/A N/A
115
956 804 655 779 N/A N/A
130
CP-1-27 CP-1-27 CP-1-25 CP-1-25
Orange Orange Red Red
CP-1-27 CP-1-27 CP-1-25 CP-1-25
Orange Orange Red Red
CP-1-27 CP-1-27 CP-1-25 CP-1-25
Orange Orange Red Red
CP-1-27 CP-1-27 CP-1-25 CP-1-25
Orange Orange Red Red
CP-1-27 CP-1-27 CP-1-25 CP-1-25
Orange Orange Red Red
CP-1-27 CP-1-27 CP-1-25 CP-1-25
Orange Orange Red Red
CP-1-31 CP-1-31 CP-1-28 CP-1-28
Gray Gray Green Green
CP-1-31 CP-1-31 CP-1-28 CP-1-28
Gray Gray Green Green
CP-1-31 CP-1-31 CP-1-28 CP-1-28
Gray Gray Green Green
CP-1-32 CP-1-31 CP-1-31 CP-1-31
White Gray Gray Gray
CP-1-32 CP-1-31 CP-1-31 CP-1-31
White Gray Gray Gray
CP-1-32 CP-1-31 CP-1-31 CP-1-31
White Gray Gray Gray
CP-1-32 CP-1-31 CP-1-31 CP-1-31
White Gray Gray Gray
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
M1 M2 M3 M4 M5 M6
RP3 RP3 RP3 RP3
Green Green Green Green
RP3 RP3 RP3 RP3
Green Green Green Green
RP3 RP3 RP3 RP3
Green Green Green Green
RP3 RP3 RP3 RP3
Green Green Green Green
RP3 RP3 RP3 RP3
Green Green Green Green
RP3 RP3 RP3 RP3
Green Green Green Green
RP3 RP3 RP3 RP3
Green Green Green Green
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
RP3 RP3 RP3 RP3
Gray Gray Gray Gray
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
IMM WGZC WGZ 030C through 200C 7
WGZ-CA, Remote Condenser, Mounting Weights & Vibration Mounting Location, Continued
Unit Mounting Weights, Lbs Spring-Flex Mountings Spring-Flex Mountings
Size M1 M2 M3 M4 M5 M6 M1 M2 M3 M4 M5 M6
821 793 763 931 968 1003
150
863 812 750 919 986 1047
170
875 831 784 947 1000 1057
200
CP-2-26 CP-2-26 CP-2-26 CP-2-27 CP-2-27 CP-2-27
Purple Purple Purple Orange Orange Orange
CP-2-26 CP-2-26 CP-2-26 CP-2-27 CP-2-27 CP-2-27
Purple Purple Purple Orange Orange Orange
CP-2-26 CP-2-26 CP-2-26 CP-2-27 CP-2-27 CP-2-27
Purple Purple Purple Orange Orange Orange
M1 M2 M3 M4 M5 M6
RP4 RP4 RP4 RP4 RP4 RP4
Black Black Black Black Black Black
RP4 RP4 RP4 RP4 RP4 RP4
Black Black Black Black Black Black
RP4 RP4 RP4 RP4 RP4 RP4
Black Black Black Black Black Black
Table 4, WGZ-CW, Packaged, Isolator Kit Numbers
Model Number 030-060 070 080 090-130 150-200
Spring-Flex 331987982 3319887983 350014861 350014895 331987984
R-I-S 350014853 350014849 350014849 350014845 350014843
Table 5, WGZ-CA, Remote Condenser, Isolator Kit Numbers
Model Number 030-055 060 070-080 090-130 150-200
Spring-Flex 350014838 331987985 331987985 350014894 331987986
R-I-S 350014887 350014887 350014853 350014853 331987954
Table 6, Spring Flex Isolator Dimensions
6.0
(152.4)
6.0
(152.4)
6.0
(152.4)
6.0
(152.4)
6.0
(152.4)
6.0
(152.4)
9.0
(228.6)
Dimensions
In. (mm)
4.7
(119.4)
4.7
(119.4)
4.7
(119.4)
4.7
(119.4)
4.7
(119.4)
4.7
(119.4)
7.7
(195.6)
2.7
(68.6)
2.7
(68.6)
2.7
(68.6)
2.7
(68.6)
2.7
(68.6)
2.7
(68.6)
2.7
(68.6)
(139.7)
(139.7)
(139.7)
(139.7)
(139.7)
(139.7)
(146.0)
Housing
CP-1
CP-1
CP-1
CP-1
CP-1
CP-1
CP-2
NOTE: CP-1 housing contains one spring. CP-2 housing contains two identical springs.
Spring
Color
Red
Purple
Orange
Green
Gray
White
Green
Max. Load
Each
Lbs. (kg)
450
(204)
600
(272)
750
(340)
900
(408)
1100
(498)
1300
(589)
1800
(815)
Defl.
In. (mm)
1.22
(30.9
1.17
(29.7)
1.06
(26.9)
1.02
(25.9)
0.83
(21.0)
0.74
(18.7)
1.02
(25.9)
A B C D E
7.5
(190.5)
7.5
(190.5)
7.5
(190.5)
7.5
(190.5)
7.5
(190.5)
7.5
(190.5)
10.2
(259.1)
Table 7, Neoprene-in-Shear Isolators
4.1
4.1
5.0
Dimensions
In. (mm)
0.56
(14.2)
0.56
(14.2)
0.56
(14.2)
0.25
(6.4)
0.25
(6.4)
0.25
(6.4)
Type
RP-3 Green
RP-3 Gray
R-4 Black
NOTE: (1) "D" is the mounting hole diameter.
Max. Load
Each
Lbs. (kg)
750
(339)
1100
(498)
1500
(679)
Defl.
In. (mm)
0.25
(6.4)
0.25
(6.4)
0.25
(6.4)
A B C D (1) E H L W
2.5
(63.5)
2.5
(63.5)
3.75
(95.3)
0.5
(12.7)
0.5
(12.7)
0.5
(12.7)
(104.1)
(104.1)
(127.0)
Housing
Part Number
5.5
226102B-00 226115A-00
5.5
226102B-00 226116A-00
5.5
226102B-00 226117A-00
5.5
226102B-00 226118A-00
5.5
226102B-00 226119A-00
5.5
226102B-00 226120A-00
5.75
226103B-00 (2) 226118A-00
1.75
(44.4)
1.75
(44.4)
1.6
(41.1)
5.5
(165)
5.5
(165)
6.5
(165.1)
3.4
(85.7)
3.4
(85.7)
4.6
(116.8)
Spring
Part Number
McQuay
Part Number
216397A-03
216397A-05
216398A-04
8 WGZ 030C through 200C IMM WGZC
Table 8, Spring Flex Mounting. CP-2
Table 9, Neoprene-in-Shear Mounting, RP-3
Table 10, Spring Flex Mounting, CP-1
Table 11, Neoprene-in-Shear, R4
IMM WGZC WGZ 030C through 200C 9
W
Water Piping
Vessel Drains at Start-up
Condensers are drained of water in the factory and are shipped with the condenser drain plugs in the
heads removed and stored in a bag in the control panel. Be sure to replace plugs prior to filling the
vessel with fluid.
General
Due to the variety of piping practices, it is advisable to follow the recommendations of local
authorities for code compliance. They can supply the installer with the proper building and safety
codes required for a safe and proper installation.
Basically, the piping should be designed with a minimum number of bends and changes in elevation
to keep system cost down and performance up. Other piping design considerations include:
1. All piping should be installed and supported to prevent the chiller connections from bearing any
strain or weight of the system piping.
2. Vibration eliminators to reduce vibration and noise transmission to the building.
3. Shutoff valves to isolate the unit from the piping system during unit servicing.
4. Manual or automatic air vent valves at the high points of the system. Drains should be placed at
the lowest points in the system.
5. Some means of maintaining adequate system water pressure (e.g., expansion tank or regulating
valve).
6. Temperature and pressure indicators located within 3 feet (0.9 meters) of the inlet and outlet of
the vessels to aid in unit servicing.
7. A strainer or some means of removing foreign matter from the water before it enters the pump is
recommended. It should be placed far enough upstream to prevent cavitation at the pump inlet
(consult pump manufacturer for recommendations). The use of a strainer will prolong pump life
and thus maintain system performance.
Important Note
A cleanable 40-mesh strainer must also be placed in the water line just prior to the inlet
of the evaporator on Models WGZ 030 to 130. A 20-mesh is satisfactory on Models WGZ
150 to 200. This will aid in preventing foreign material from entering and decreasing the
performance of the evaporator.
8. If the unit is used as a replacement chiller on a previously existing piping system, the system
should be thoroughly flushed prior to unit installation. Regular water analysis and chemical
water treatment on the evaporator and condenser is recommended immediately upon equipment
start-up.
9. In the event glycol is added to the water system, as an afterthought for freeze protection,
recognize that the refrigerant suction pressure will be lower, cooling performance less, and
water side pressure drop will be higher. If the percentage of glycol is large, or if propylene
glycol is used instead of ethylene glycol, the added pressure drop and loss of performance
could be substantial. Reset the freezestat and low leaving water alarm temperatures. The
freezestat is factory set to default at 36°F (2.2°C). Reset the freezestat setting to approximately
4° to 5°F (2.3° to 2.8°C) below the leaving chilled water setpoint temperature. See the section
titled “Glycol Solutions” for additional information concerning the use of glycol.
10. A preliminary leak check of the water piping should be made before filling the system.
10 WGZ 030C through 200C IMM
Note: A water flow switch or pressure differential switch must be mounted in the
A
evaporator outlet water line to signal that there is water flow before the unit will start.
Table 12, Typical Field Evaporator Water Piping, WGZ 030 to 130
Air
Vent
Strainer
Inlet
Isolation
Val ves
Flow
Outlet
P
Drain
Vibration
Eliminators
Switch
NOTE: Water piping must be supported independently from the unit.
Figure 3, Typical Field Evaporator Water Piping, WGZ 150 to 200
Liquid
Out
Drain
Vent
In
Vibration
Eliminator
Suction
Valved
Pressure
Gauge
Flow
Switch
Vibration
Eliminator
Balancing
Valve
Water
Strainer
Gate
Valve
Flow
Gate
Valve
Protect All Field Piping
Flow
gainst Freezing
NOTE: Inlet and outlet connections may be reversed on some units. Check unit
dimension drawing.
System Water Volume
It is important to have adequate water volume in the system to provide an opportunity for the chiller
to sense a load change, adjust to the change, and then stabilize. As the expected load change
becomes more rapid, a greater water volume is needed. The system water volume is the total
amount of water in the evaporator, air handling equipment, and associated piping. If the water
volume is too low, operational problems can occur including rapid compressor cycling, rapid
loading and unloading of compressors, erratic refrigerant flow in the chiller, improper motor
cooling, shortened equipment life and other undesirable occurrences.
For normal comfort cooling applications where the cooling load changes relatively slowly, a
minimum system volume of two to three minutes times the flow rate (GPM) is recommended. For
example, if the design chiller flow rate is 120 gpm, we recommend a system volume of 240 to 360
gallons.
For process applications where the cooling load can change rapidly, additional system water
volume is needed. A process example would be the quenching of hot metal objects. The load would
be very stable until the hot metal is dipped into the water tank. Then, the load would increase
drastically.
Since there are many other factors that can influence performance, systems can successfully operate
below these suggestions. However, as the water volume decreases below these guidelines, the
possibility of problems increases.
IMM WGZC WGZ 030C through 200C 11
W
Variable Chilled Water Flow
Reducing chilled water flow in proportion to load can reduce total system power consumption.
Certain restrictions apply to the amount and rate of flow change. The rate of flow change should
be a maximum of 10 percent of the change, per minute. Do not reduce flow lower than the part
load minimum flows listed on page
15.
Chilled Water Piping
The system water piping must be flushed thoroughly prior to making connections to the unit
evaporator. It is required that a 40-mesh strainer be installed in the return water line before the
inlet to the chiller. Lay out the water piping so the chilled water circulating pump discharges into
the evaporator inlet.
The return water line must be piped to the evaporator inlet connection and the supply water line
must be piped to the evaporator outlet connection. If the evaporator water is piped in the reverse
direction, a substantial decrease in capacity and efficiency of the unit will be experienced.
A flow switch must be installed in the horizontal piping of the supply (evaporator outlet) water
line to prove water flow before starting the unit.
Drain connections should be provided at all low points in the system to permit complete drainage
of the system. Air vents should be located at the high points in the system to purge air out of the
system. The evaporators are not equipped with vent or drain connections and provision must be
made in the entering and leaving chilled water piping for venting and draining.
Pressure gauges should be installed in the inlet and outlet water lines to the evaporator. Pressure
drop through the evaporator should be measured to determine water flow from the flow/pressure
drop curves beginning on page
return water lines.
Chilled water piping should be insulated to reduce heat loss and prevent condensation. Complete
unit and system leak tests should be performed prior to insulating the water piping. Insulation
with a vapor barrier would be the recommended type of insulation. If the vessel is insulated, the
vent and drain connections must extend beyond the proposed insulation thickness for
accessibility.
Chillers not run in the winter should have their water systems thoroughly drained if subject to
sub-freezing temperatures. If the chiller operates year-round, or if the system is not drained for
the winter, the chilled water piping exposed to sub-freezing ambient temperatures should be
protected against freezing by wrapping the lines with a heater cable. In addition, an adequate
percentage of glycol should be added to the system to further protect the system during low
ambient temperature periods. It should be noted that water piping that has been left drained is
subject to more corrosion than if filled with water. Use of a Vapor Corrosion Inhibitor (VCI) or
some other protection should be considered.
16. Vibration eliminators are recommended in both the supply and
Figure 4 Thermostat Well Location, WGZ 030 - 130
The chilled water sensor is factory installed in the leaving water
Suction
Circuit #1
Suction
Circuit #2
Leaving Chilled
Water Sensor
Liquid
Circuit #2
Liquid
Circuit #1
12 WGZ 030C through 200C IMM
connection on the evaporator. Care should be taken not to damage
the sensor cable or lead wires when working around the unit. It is
also advisable to check the lead wire before running the unit to be
sure that it is firmly anchored and not rubbing on the frame or any
other component. If the sensor is ever removed from the well for
servicing, care must be taken to not wipe off the heat-conducting
compound supplied in the well.
!
T
CAUTION
The thermostat bulb should not be exposed to water temperatures above 125°F (51.7°C)
since this will damage it.
Flow Switch
A water flow switch must be mounted in the leaving evaporator and condenser water lines to
prove adequate water flow before the unit can start. This will safeguard against slugging the
compressors on start-up. It also serves to shut down the unit in the event that water flow is
interrupted to guard against evaporator freeze-up.
Factory-mounted and wired evaporator and condenser flow switches are available as an option
If the optional factory flow switch is not supplied, a flow switch is available from McQuay under
part number 01750330. It is a “paddle” type switch and adaptable to any pipe size from 1 in. (25
mm) to 6 in. (152 mm) nominal. Certain flow rates are required to open the switch and are listed
Table 13. Wire from switch terminals Y and R to panel terminals 33 and 43 (chilled water) and
in
41 and 53 (condenser water). There is also a set of normally closed contacts on the switch that
could be used for an indicator light or an alarm to indicate when a “no flow” condition exists.
1. Apply pipe sealing compound to only the threads of the switch and screw unit into 1 in. (25 mm)
reducing tee. The flow arrow must be pointed in the correct direction.
2. Piping should provide a straight length before and after the flow switch of at least five times the
pipe diameter without any valves, elbows, or other flow restricting elements.
!
CAUTION
Make sure the arrow on the side of the switch is pointed in the direction of flow. The flow
switch is designed to handle the control voltage and should be connected according to the
wiring diagram
Table 13, Paddle-Type Flow Switch Flow Rates
No
No
inch 1 1/4 1 1/2 2 2 1/2 3 4 5 6 8 Pipe Size
mm 32 (2) 38 (2) 51 63 (3) 76 102 (4) 127 (4) 153 (4) 204 (5)
gpm 5.8 7.5 13.7 18.0 27.5 65.0 125.0 190.0 205.0
Lpm 1.3 1.7 3.1 4.1 6.2 14.8 28.4 43.2 46.6
gpm 3.7 5.0 9.5 12.5 19.0 50.0 101.0 158.0 170.0
gpm 13.3 19.2 29.0 34.5 53.0 128.0 245.0 375.0 415.0
Lpm 3.0 4.4 6.6 7.8 12.0 29.1 55.6 85.2 94.3
gpm 12.5 18.0 27.0 32.0 50.0 122.0 235.0 360.0 400.0
NOTES (x)
Min.
Adjst.
Max.
Adjst.
Flow
Flow Lpm 0.8 1.1 2.2 2.8 4.3 11.4 22.9 35.9 38.6
Flow
Flow Lpm 2.8 4.1 6.1 7.3 11.4 27.7 53.4 81.8 90.8
NOTES:
1. A segmented 3-inch paddle (1, 2, and 3 inches) is furnished mounted, plus a 6-inch paddle loose.
2. Flow rates for a 2-inch paddle trimmed to fit the pipe.
3. Flow rates for a 3-inch paddle trimmed to fit the pipe.
4. Flow rates for a 3-inch paddle.
5. Flow rates for a 6-inch paddle.
Glycol Solutions
Chiller capacity, flow rate, evaporator pressure drop, and power input for glycol solutions can be
calculated using the following formulas and reference to
propylene glycol.
1. Capacity, Capacity is reduced compared to that with plain water. To find the reduced value,
multiply the chiller’s capacity when using water by the capacity correction factor C to find
the chiller’s capacity when using glycol.
2. Flow, To determine evaporator gpm (or T) knowing T (or gpm) and capacity:
Table 14 for ethylene and Table 15 for
GPMGlycol
IMM WGZC WGZ 030C through 200C 13
24
CapacityGlycolx
TablesFromGCorrectionFlowx
W
For Metric Applications -- Determine evaporator lps (or T) knowing T (or lps)
and kW:
LpsGlycol
kW
Tx
18.4
TablesfromGCorrectionFlowx
3. Pressure Drop, To determine glycol pressure drop through the cooler, enter the water
pressure drop graph on page
15 at the actual glycol flow. Multiply the water pressure
drop found there by P to obtain corrected glycol pressure drop.
4. Power, To determine glycol system kW, multiply the water system kW by factor K.
Test coolant with a clean, accurate, glycol solution hydrometer (similar to that found in
service stations) to determine the freezing point. Obtain percent glycol from the freezing
point found in
Table 14 or Table 15. On glycol applications the supplier normally
recommends that a minimum of 25% solution by weight be used for protection against
corrosion or the use of additional inhibitors.
Note: The effect of glycol in the condenser is negligible. As glycol increases in
temperature, its characteristics have a tendency to mirror those of water.
Therefore, for selection purposes, there is no derate in capacity for glycol in the
condenser.
Table 14, Ethylene Glycol
Glycol
10 26 -3 0.991 0.996 1.013 1.070
20 18 -8 0.982 0.992 1.040 1.129
30 7 -14 0.972 0.986 1.074 1.181
40 -7 -22 0.961 0.976 1.121 1.263
50 -28 -33 0.946 0.966 1.178 1.308
Freezing Point Percent
°F °C
C (Capacity) K (Power) G (Flow)
P (Pressure
Drop)
Table 15, Propylene Glycol
Glycol
10 26 -3 0.987 0.992 1.010 1.068
20 19 -7 0.975 0.985 1.028 1.147
30 9 -13 0.962 0.978 1.050 1.248
40 -5 -21 0.946 0.971 1.078 1.366
50 -27 -33 0.929 0.965 1.116 1.481
Freezing Point Percent
°F °C
C (Capacity) K (Power) G (Flow)
P (Pressure
Drop)
!
CAUTION
Do not use automotive antifreeze. Industrial glycols must be used. Automotive antifreeze
contains inhibitors that causes plating on copper tubes. The type and handling of glycol used
must be consistent with local codes.
14 WGZ 030C through 200C IMM
Condenser Water Piping
Arrange the condenser water so the water enters the bottom connection of the condenser.
The condenser water will discharge from the top connection. Failing to arrange the
condenser water as stated above will negatively affect the capacity and efficiency.
Install pressure gauges in the inlet and outlet water lines to the condenser. Pressure drop
through the condenser should be measured to determine flow on the pressure drop/flow
curves on page
water lines. Install a 20-mesh strainer in the inlet piping to the condenser.
Water-cooled condensers can be piped for use with cooling towers, well water, or heat
recovery applications. Cooling tower applications should be made with consideration of
freeze protection and scaling problems. Contact the cooling tower manufacturer for
equipment characteristics and limitations for the specific application.
Head pressure control must be provided if the entering condenser water can fall below
60F. The WGZ condenser has two refrigerant circuits with a common condenser water
circuit. This arrangement makes head pressure control with discharge pressure actuated
control valves difficult.
If the tower water temperature cannot be maintained at a 60F minimum, or when pond,
lake, or well water that can fall below 60F (15C) is used as the condensing medium,
special discharge pressure control must be used. A water recirculating system with
recirculating pump as shown in
advantage of maintaining tube velocity to help prevent tube fouling. The pump should
cycle with the chiller.
Table 16, Recirculating Discharge Pressure Control System
17. Vibration eliminators are recommended in both the supply and return
Table 16 is recommended. This system also has the
Circuit #1
Inlet
Circuit #2
Inlet
Temperature
Control
Val ve
Condenser
Condenser
Water
Circuit #1
Outlet
Circuit #2
Outlet
Pressure Drops
The evaporator flow rates and pressure drops shown on the following page (Figure 5) are for full load
design purposes. The maximum flow rate and pressure drop are based on a 6-degree temperature drop.
Avoid higher flow rates with resulting lower temperature drops to prevent potential control problems
resulting from very small control bands and limited start up/shut off temperature changes.
The minimum flow and pressure drop is based on a full load evaporator temperature drop of 16-degrees.
Condenser pressure drops are shown in
IMM WGZC WGZ 030C through 200C 15
Figure 6 on page 17.
W
Figure 5, Evaporator Pressure Drop, WGZ 030C – WGZ 200C
)
Pressure Drop (ft of water)
WGZ-C
Model
030
035
040
045
050
055
060
070
080
090
100
115
130
150
175
200
Inch-Pound S.I. Inch-Pound S.I. Inch-Pound S.I.
GPM Ft. L/S kPa GPM Ft. L/S kPa GPM Ft. L/S kPa
45.0 4.7 2.8 14.1 72.0 11.0 4.5 32.9 120.0 27.6 7.6 82.4
51.9 4.9 3.3 14.6 83.0 11.4 5.2 34.0 138.3 28.5 8.7 85.4
61.1 5.1 3.9 15.2 97.8 11.8 6.2 35.4 163.0 29.7 10.3 88.8
68.2 5.2 4.3 15.5 109.1 12.1 6.9 36.1 181.8 30.2 11.5 90.4
76.7 5.8 4.8 17.2 122.6 13.4 7.7 40.1 204.4 33.6 12.9 100.6
84.6 6.1 5.3 18.1 135.4 14.1 8.5 42.2 225.6 35.4 14.2 105.9
90.8 6.6 5.7 19.7 145.2 15.6 9.2 46.5 242.0 39.2 15.3 117.1
106.3 3.7 6.7 10.9 170.0 8.6 10.7 25.6 283.4 21.2 17.9 63.3
117.5 4.3 7.4 12.8 187.9 10.0 11.9 29.9 313.2 25.0 19.8 74.9
132.1 4.5 8.3 13.3 211.3 10.5 13.3 31.3 352.1 26.1 22.2 78.1
146.6 4.9 9.3 14.6 234.6 11.4 14.8 34.1 391.1 28.7 24.7 85.8
169.3 4.5 10.7 13.5 270.9 10.5 17.1 31.4 451.5 26.4 28.5 78.9
188.1 4.2 11.9 12.6 301.0 9.8 19.0 29.5 501.6 24.7 31.6 73.9
219.9 5.0 15.0 351.8 12.8 38.3 586.4 35.5 106.1
254.0 7.2 21.5 406.3 18.5 55.3 677.2 51.4 153.6
282.2 8.6 25.7 451.4 22.0 65.8 752.4 61.0 182.3
Notes:
1. Minimum, nominal, and maximum flows are at a 16-degree F, 10-degree F, and 6-degree F chilled water temperature range
respectively and at ARI tons.
Minimum Flow Nominal Flow Maximum Flow
Flow Rate (GPM
16 WGZ 030C through 200C IMM
Figure 6, Condenser Pressure Drop, WGZ 030C – WGZ 200C
)
Pressure Drop (ft of water)
Flow Rate (GPM
Unit Model
WGZ030C 30 56.1 2.4 3.5 7.2 89.7 6.3 5.7 18.8 149.5 17.4 9.4 52.0
WGZ035C 35 64.9 3.4 4.1 10.2 103.8 8.6 6.5 25.7 173.0 23.9 10.9 71.4
WGZ040C 41 76.3 2.7 4.8 8.1 122.1 6.9 7.7 20.6 203.5 19.3 12.8 57.7
WGZ045C 46 85.3 3.6 5.4 10.8 136.5 9.2 8.6 27.5 227.5 25.7 14.4 76.8
WGZ050C 51 96.4 2.9 6.1 8.7 154.2 7.5 9.7 22.4 257.0 20.7 16.2 61.9
WGZ055C 57 105.8 3.8 6.7 11.4 169.2 9.7 10.7 29.0 282.0 26.8 17.8 80.1
WGZ060C 63 113.4 4.5 7.2 13.5 181.5 11.6 11.5 34.7 302.5 32.3 19.1 96.5
WGZ070C 71 132.8 4.1 8.4 12.3 212.4 10.4 13.4 31.1 354.0 29.0 22.3 86.7
WGZ080C 78 146.8 3.7 9.3 11.1 234.9 9.5 14.8 28.4 391.5 26.5 24.7 79.2
WGZ090C 88 165.0 3.4 10.4 10.2 264 8.8 16.7 26.3 440.0 24.5 27.8 73.2
WGZ100C 98 183.4 3.4 11.6 10.2 293.4 8.8 18.5 26.3 489.0 24.4 30.9 72.9
WGZ115C 113 211.7 4.8 13.4 14.3 338.7 12.3 21.4 36.8 564.5 34.1 35.6 101.9
WGZ130C 128 235.1 6.1 14.8 18.2 376.2 15.5 23.7 46.3 627.0 43.1 39.6 128.8
WGZ150C 147 274.9 6.2 17.3 18.5 439.8 15.8 27.7 47.2 733.0 43.8 46.2 130.9
WGZ170C 169 317.4 5.5 20.0 16.4 507.9 14.0 32.0 41.8 846.5 38.9 53.4 116.3
WGZ200C 188 352.7 7.4 22.3 22.1 564.3 18.8 35.6 56.2 940.5 52.3 59.3 156.3
Nom
Tons
Min. Flow & PD Nom. Flow & PD Max. Flow & PD
IP SI IP SI IP SI
GPM Ft. L/S kPa GPM Ft. L/S kPa GPM Ft. L/S kPa
IMM WGZC WGZ 030C through 200C 17
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Refrigerant Piping
Unit with Remote Condenser
General
Refrigerant piping, to and from the unit, should be sized and installed according to the
latest ASHRAE Handbook. It is important that the unit piping be properly supported with
sound and vibration isolation between tubing and hanger, and that the discharge lines be
looped at the condenser and trapped at the compressor to prevent refrigerant and oil from
draining into the compressors. Looping the discharge line also provides greater line
flexibility.
NOTE: Do not install any refrigerant piping underground.
The discharge gas valves, liquid line solenoids, filter-driers, moisture indicators, and
thermostatic expansion valves are all factory mounted as standard equipment with the
water chiller.
For remote condenser application (WGZ-CA) such as air-cooled or evaporative
condenser, the chillers are shipped with an R-410A holding charge. The unit is evacuated
in the factory to 500 microns before charging with the holding. The unit is leak tested
after charging and before shipment.
The liquid line has a shutoff valve upstream from the liquid line solenoid valve and a
copper tube cap to be brazed on this line after test to seal this line for shipment.
The discharge line has a ball valve installed between the compressor and the discharge
stub tube with a copper tube cap brazed on the line after test to seal it for shipment.
The discharge gas valves, liquid line solenoids, filter-driers, moisture indicators, and
thermostatic expansion valves are all factory-mounted as standard equipment with the
water chiller.
!
DANGER
Do not apply heat, such as a brazing torch, to a sealed unit, vessel, or component. Internal
gases can increase the internal pressure and cause a life-threatening explosion. Open the
system when heating. The short line between a valve and brazed end cap can be drilled to
vent it. Note that the valve may leak and the entire unit charge may be open to the cap.
It is important that the unit be kept tightly closed until the remote condenser is installed,
piped to the unit and the high side evacuated. NOTE: it is possible to maintain a positive
refrigerant pressure in the unit when a small leak is present. Therefore, add refrigerant to
the unit to achieve sufficient pressure to allow a good leak test and carefully leak test the
unit. Correct any leaks found.
When the field piping has been leak tested, evacuated, and is ready to charge, the unit
valves can be opened and the system charged.
Alternate method: an alternate method is to open up the unit to the field piping and to
pressure test, evacuate and charge the entire system together at one time. Many people
feel that this is a more straight-forward approach.
After the equipment is properly installed, leak tested, and evacuated, it can be charged
with R-410A, and run at design load conditions. Add charge until the liquid line sight
glass is clear, with no bubbles flowing to the expansion valve. Total operating charge will
depend on the air-cooled condenser used and volume of the refrigerant piping.
18 WGZ 030C through 200C IMM
NOTE: On WGZ-CA units (units with remote condensers), the installer is required to
record the refrigerant charge by stamping the total charge and the charge per circuit on
the serial plate in the appropriate blocks provided for this purpose.
The following discussion is intended for use as a general guide to the piping of air-cooled
condensers.
Discharge lines must be designed to handle oil properly and to protect the compressor
from damage that can result from condensing liquid refrigerant in the line during
shutdown. Total friction loss for discharge lines of 3 to 6 psi (20.7 to 41.4 kPa) is
considered good design. Careful consideration must be given for sizing each section of
piping to insure that gas velocities are sufficient at all operating conditions to carry oil. If
the velocity in a vertical discharge riser is too low, considerable oil can collect in the riser
and the horizontal header, causing the compressor to lose its oil and result in damage due
to lack of lubrication. When the compressor load is increased, the oil that had collected
during reduced loads can be carried as a slug through the system and back to the
compressor, where a sudden increase of oil concentration can cause liquid slugging and
damage to the compressor.
Any horizontal run of discharge piping should be pitched away from the compressor
approximately 1/8 inch (6.4 mm) per foot (meter) or more. This is necessary to move, by
gravity, any oil lying in the header. Oil pockets must be avoided because oil needed in the
compressor would collect at such points and the compressor crankcase can become
starved.
It is recommended that any discharge lines coming into a horizontal discharge header rise
above the centerline of the discharge header. This is necessary to prevent any oil or
condensed liquid from draining to the compressor heads when the compressor is not
running.
In designing liquid lines, it is important that the liquid reach the expansion valve without
flash gas since this gas will reduce the capacity of the valve. Because “flashing” can be
caused by a pressure drop in the liquid line, the pressure losses due to friction and
changes in static head should be kept to a minimum.
A check valve must be installed in the liquid line in all applications where the ambient
temperature can drop below the equipment room temperature. This prevents liquid
migration to the condenser, helps maintain a supply of refrigerant in the liquid line for
initial start-up, and keeps liquid line pressure high enough on “off” cycle to keep the
expansion valve closed.
On systems as described above, a relief valve or relief-type check valve, must be used in
the liquid line as shown in piping systems (shown in
and Its purpose is to relieve
dangerous hydraulic pressures that could be created as cool liquid refrigerant trapped in
the line between the check valve and the expansion or shutoff valve warms up. Install a
relief device in the hot gas piping at the condenser coil as shown in
and Figure 8. Install
a discharge check valve in the discharge line, in a horizontal run, close to the condenser.
Recommended Line Sizing
The following tables provide recommended line sizing for the field piping. Final design
should be based on ASHRAE design standards.
IMM WGZC WGZ 030C through 200C 19
W
Table 17, Equivalent Feet for Fittings
Fitting Type 7/8 1 1/8 1 3/8 1 5/8 2 1/8 2 5/8 3 1/8
Elbows
90º Standard 2.0 2.6 3.3 4.0 5.0 6.0 7.5
90º Long Radius 1.4 1.7 2.3 2.6 3.3 4.1 5.0
90º Street 3.2 4.1 5.6 6.3 8.2 10 12
45º Standard 0.9 1.3 1.7 2.1 2.6 3.2 4.0
45º Street 1.5 2.1 3.0 3.4 4.5 5.2 6.4
180º Bend 3.2 4.1 5.6 6.3 8.2 10 12
Tees
Full Size 1.4 1.7 2.3 2.6 3.3 4.1 5.0
Reducing 2.0 2.6 3.3 4.0 5.0 6.0 7.5
Valves
Globe Valve, Open 22 29 38 43 55 69 84
Gate Valve, Open 0.9 1.0 1.5 1.8 2.3 2.8 3.2
Angle Valve, Open 9.0 12 15 18 24 29 35
Table 18, Maximum Line Size for Oil Carry Up a Discharge Riser, R-410A
Unit Size
Line
Size (in.)
Unit Size
Line
Size (in.)
WGZ
030
1 5/8 1 5/8 2 1/8 2 1/8 2 1/8 2 1/8 2 1/8 2 1/8 2 5/8 2 5/8
WGZ
100
2 5/8 3 1/8 3 1/8 2 5/8 3 1/8 3 1/8
WGZ
035
WGZ
115
WGZ
040
WGZ
130
WGZ
045
WGZ
150
WGZ
050
WGZ
170
WGZ
055
WGZ
200
WGZ
060
WGZ
070
WGZ
080
Table 19, Recommended Liquid Line Size, R-410A
Unit Model
WGZ-CB
WGZ 030 7/8" 7/8 " 7/8 " 7/8 " 7/8 " 7/8 "
WGZ 035 7/8" 7/8 " 7/8 " 7/8 " 7/8 " 1 1/8 "
WGZ 040 7/8" 7/8 " 7/8 " 7/8 " 1 1/8 " 1 1/8 "
WGZ 045 7/8" 7/8 " 7/8 " 7/8 " 1 1/8 " 1 1/8 "
WGZ 050 7/8" 7/8 " 7/8 " 7/8 " 1 1/8 " 1 1/8 "
WGZ 055 7/8" 7/8 " 7/8 " 1 1/8” 1 1/8 " 1 1/8 "
WGZ 060 7/8" 7/8 “ 7/8 " 1 1/8 " 1 1/8 " 1 1/8 "
WGZ 070 1 1/8” 1 1/8” 1 1/8 " 1 1/8 " 1 1/8 " 1 1/8”
WGZ 080 1 1/8” 1 1/8 " 1 1/8 " 1 1/8” 1 1/8” 1 1/8”
WGZ 090 1 1/8” 1 1/8 " 1 1/8 " 1 1/8” 1 1/8” 1 1/8”
WGZ 100 1 1/8” 1 1/8 " 1 1/8 " 1 1/8” 1 1/8” 1 1/8”
WGZ 115 1 1/8” 1 1/8 " 1 1/8 " 1 1/8” 1 3/8” 1 3/8”
WGZ 130 1 1/8” 1 1/8 " 1 3/8” 1 1/8” 1 3/8” 1 3/8”
WGZ 150 1 3/8” 1 3/8” 1 1/8 " 1 3/8” 1 3/8” 1 3/8”
WGZ 170 1 3/8” 1 3/8” 1 1/8 " 1 3/8” 1 3/8” 1 3/8”
WGZ-200 1 3/8” 1 3/8” 1 1/8 " 1 3/8” 1 3/8” 1 3/8”
Connection
Size at Unit
(in.)
Up to Up to Up to Up to Up to
50 Equiv. Ft 75 Equiv. Ft 100 Equiv. Ft 125 Equiv. Ft 150 Equiv. Ft
Recommended Liquid Line Size (in.)
WGZ
090
20 WGZ 030C through 200C IMM
Table 20, Recommended Horizontal or Downflow Discharge Line Size, R-410A
Unit Model
AGZ-CB
WGZ 030 1 3/8" 1 1/8" 1 1/8" 1 1/8" 1 1/8" 1 1/8"
WGZ 035 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8"
WGZ 040 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8"
WGZ 045 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8"
WGZ 050 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8"
WGZ 055 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8"
WGZ 060 1 3/8" 1 3/8" 1 5/8” 1 5/8” 1 5/8” 1 5/8”
WGZ 070 1 3/8" 1 3/8" 1 5/8” 1 5/8” 1 5/8” 1 5/8”
WGZ 080 1 5/8” 1 5/8” 1 5/8” 1 5/8” 1 5/8” 1 5/8”
WGZ 090 1 5/8” 1 5/8” 1 5/8” 1 5/8” 1 5/8” 1 5/8”
WGZ 100 1 5/8” 1 5/8” 1 5/8” 1 5/8” 1 5/8” 1 5/8”
WGZ 115 1 5/8” 1 5/8” 1 5/8” 2 1/8" 2 1/8" 2 1/8"
WGZ 130 1 5/8” 1 5/8” 2 1/8" 2 1/8" 2 1/8" 2 1/8"
WGZ 150 2 1/8" 2 1/8" 2 1/8" 2 1/8" 2 1/8" 2 1/8"
WGZ 170 2 1/8" 2 1/8" 2 1/8" 2 1/8" 2 1/8" 2 1/8"
WGZ 200 2 1/8" 2 1/8" 2 1/8" 2 1/8" 2 1/8" 2 5/8"
Connection
Size
At Unit
Up to Up to Up to Up to Up to
50 Equiv. Ft 75 Equiv. Ft 100 Equiv. Ft 125 Equiv. Ft 150 Equiv. Ft
Recommended Discharge Line Sizes
T ypical Arrangement s
Figure 7 illustrates a typical piping arrangement involving a remote air-cooled condenser
located at a higher elevation than the compressor and receiver. This arrangement is commonly
encountered when the air-cooled condenser is on a roof and the compressor and receiver are on
grade level or in a basement equipment room.
Notice, in both illustrations, that the hot gas line is looped at the bottom and top of the vertical
run. This is done to prevent oil and condensed refrigerant from flowing back into the
compressor and causing damage. The highest point in the discharge line should always be
above the highest point in the condenser coil. It is advisable to include a purging vent at this
point to extract non-condensables from the system.
Figure 8 illustrates another very common application where the air-cooled condenser is located
on essentially the same level as the compressor and receiver. The discharge line piping in this
case is not too critical. The principal problem encountered with this arrangement is that there
is frequently insufficient vertical distance to allow free drainage of liquid refrigerant from the
condenser coil to the receiver.
The receiver is used when it is desired to have refrigerant storage capacity, in addition to the
pumpdown capability of the condenser.
IMM WGZC WGZ 030C through 200C 21
W
Figure 7, Condenser Above Compressor and Optional Receiver Installation
Check Valve
Relief Valve
Purge Valve
Condenser
h
c
t
i
P
Discharge Line
Loop
Relief Valve
(Vent to Outdoors
or to Condenser Side
of Liquid Line
Check Valve)
Preferred
Subcooler
Hook-up
Subcooler
To
Evap.
Receiver
Bypass
Check
Valve
Receiver
Figure 8, Condenser and Compressor on Same Level, Optional Receiver
Installation
The receiver shown is optional and not used on many installations. It is bypassed during
normal operation.
Relief Valve
(Vent to Outdoors
or to Condenser Side
of Liquid Line
Check Valve)
Preferred
Subcooler
Hook-up
Condenser
Subcooler
Relief Valve
To
Evap.
Receiver
Bypass
Receiver
Check Valve
h
c
t
i
P
Check
Valve
Check
Valve
Purge Valve
Discharge Line
22 WGZ 030C through 200C IMM
Factory-Mounted Condenser
Units with the standard water-cooled, factory-mounted condenser are provided with
complete refrigerant piping and full operating refrigerant charge at the factory.
There is a remote possibility on water-cooled units utilizing low temperature pond or
river water as a condensing medium, and if the water valves leak, that the condenser and
liquid line refrigerant temperature could drop below the equipment room temperature on
the “off” cycle. This problem only arises during periods when cold water continues to
circulate through the condenser and the unit remains off due to satisfied cooling load.
If this condition occurs:
1. Cycle the condenser pump off with the unit.
2. Check the liquid line solenoid valve for proper operation.
Relief Valve Piping
The ANSI/ASHRAE Standard 15, Safety Standard for Refrigeration Systems, specifies
that pressure relief valves on vessels containing Group 1 refrigerant (R-22) “shall
discharge to the atmosphere at a location not less than 15 feet (4.6 meters) above the
adjoining ground level and not less than 20 feet (6.1 meters) from any window,
ventilation opening or exit in any building.” The piping must be provided with a rain cap
at the outside terminating point and with a drain at the low point on the vent piping to
prevent water buildup on the atmospheric side of the relief valve. In addition, a flexible
pipe section should be installed in the line to eliminate any piping stress on the relief
valve(s).
The size of the discharge pipe from the pressure relief valve should not be less than the
size of the pressure relief outlet. When two or more vessels are piped together, the
common header and piping to the atmosphere should not be less than the sum of the area
of each of the lines connected to the header.
NOTE: Fittings should be provided to permit vent piping to be easily
disconnected for inspection or replacement of the relief valve.
Table 21, Relief Valve Piping
IMM WGZC WGZ 030C through 200C 23
W
Dimensions
C
Packaged Chillers
Figure 9, WGZ 030CW through WGZ 060CW
L4 / M4
L1 / M1
CIRCUIT 2
VENT
DRAIN
REF.
3.8
98
WGZ MODEL
NUMBER
WGZ030C
WGZ035C
WGZ040C
WGZ045C
WGZ050C
WGZ055C
WGZ060C
"A"
MICROTECH II US ER INTERFACE
CIRCUIT 1
" Y "
RELIEF VALVES
121.1
3075
134.6
3419
CHILLER WATER CONNECTION
SIZE (NOM) VICTAULIC
IN (MM) A IN (MM) X Y Z
2.5 (64) 107.4 (2728) 4 (102) 59.2 22.4 14.1
2.5 (64) 108.4 (2753) 4 (102) 59.9 22.8 14.2
2.5 (64) 109.8 (2789) 4 (102) 59.6 22.8 14.2
2.5 (64) 111.5 (2832 4 (102) 59.2 22.9 14.2
2.5 (64) 113.3 (2878) 4 (102) 59.0 23.3 14.2
2.5 (64) 115.0 (2921) 4 (102) 58.7 23.4 14.2
2.5 (64) 116.7 (2965) 4 (102) 58.0 23.6 14.3
CONTROL BOX
" X "
L3 / M3
WATER
CONNECTIONS
L2 / M2
CONTROL
CONNECTION
.88 KNOCKOUTS
ON OPPOSITE SIDE
REMOVABLE
DISC. HANDLE
POWER
CONNECTIONS
3.9
100
OUTLET
CONDENSER
INLET
9.7
246
.88 KNOCKOUTS
CONDENSER WATER
CONNECTION SIZE
(NOM) VICTAULIC
23.5
597
2.0
51
63.4
1609
20.0
508
" Y "
12.4
314
" Z "
.875 DIA MOUNTING HOLES (4)
CENTER OF GRAVITY
32.8
832
30.1
763
OUTLET
29.0
737
32.0
813
INLET
40.0
1016
13.3
338
EVAPORATOR
REMOVE BRKT.
FOR SHIPPING
ONLY
8.0
204
WGZ030C-060
44.9
1139
29.2
742
14.0
354
Packaged Unit
331929701
24 WGZ 030C through 200C IMM
Figure 10, WGZ 070CW through WGZ 130CW
W
L1 / M1 L2 / M2
CIRCUIT 2
MICROTECH II USER INTERFACE
CIRCUIT 1
"A"
CONTROL BOX
VENT
DRAIN
"T"
RELIEF VALVES
121.1
3075
"L"
" X "
L3 / M3L4 / M4
INLET
EVAPORATOR
OUTLET
14.2
361
WATER
CONNECTIONS
CONTROL
CONNECTION
.88 KNOCKOUTS
ON OPPOSITE SIDE
REMOVABLE
DISC. HANDLE
4.0
CONNECTIONS
102
OUTLET
CONDENSER
INLET
POWER
" Y "
.88 KNOCKOUTS
40.2
1021
"W"
32.3
821
23.5
597
10.0
253
REMOVE BRKT.
FOR SHIPPING
ONLY
57.6
1462
32.8
834
17.9
454
WGZ070-130C
Packaged Chiller
331929801
2.0
51
"H"
20.0
508
14.5
369
13.0
330
" Z "
29.0
737
.875 DIA MOUNTING HOLES (4)
32.0
813
40.0
1016
WGZ MODEL
NUMBER
WGZ070C
WGZ080C
WGZ090C
WGZ100C
WGZ115C
WGZ130C
MAXIMUM OVERALL
DIMENSIONS
IN (MM)
“L” “W” “H”
143.3
(3639)
149.6
(3799)
149.4
(3795)
149.4
(3795)
149.4
(3795)
149.4
(3795)
35.0
(889)
35.0
(889)
35.0
(889)
35.0
(889)
35.0
(889)
35.0
(889)
65.5
(1664)
65.5
(1664)
65.5
(1664)
65.5
(1664)
65.5
(1664)
65.5
(1664)
CHILLER
WATER
CONNECTION
IN(MM)
VICTAULIC
SIZE (NOM)
3 (76)
3 (76)
3 (76)
3 (76)
3 (76)
3 (76)
“A”
114.9
(2918)
115.3
(2930)
117.1
(2975)
118.0
(2997)
121.6
(3088)
124.7
(3167)
CONDENSER
WATER
CONNECTION
IN(MM)
VICTAULIC
SIZE (NOM)
4 (102)
4 (102)
4 (102)
4 (102)
4 (102)
4 (102)
“T”
8.0
(203)
14.3
(363)
14.1
(359)
14.1
(359)
14.1
(359)
14.1
(359)
CENTER OF GRAVITY
“X” “Y” “Z”
62.4 28.6 15.0
64.8 29.3 15.1
67.7 29.6 16.1
69.7 29.9 17.1
68.8 30.2 17.1
67.8 30.4 17.1
IMM WGZC WGZ 030C through 200C 25
W
Figure 11, WGZ 150CW through WGZ 200CW
W
23.5
596
EVAPORATOR
OUTLET
77.2
1961
EVAPORATOR
INLET
1.3
34
CIRCUIT 2
CIRCUIT 1
VENT
VENT
" Y "
145.1
3685
170.2
4322
RELIEF VALVES
" X "
DRAIN
10.9
276
DRAIN
MICROTECH II USER INTERFACE
4.0
102
CONDENSER
14.2
361
OUTLET
INLET
CONTROL
CONNECTION
.88 KNOCKOUTS
ON OPPOSITE SIDE
REMOVABLE
DISC HANDLE
POWER
CONNECTIONS
77.7
1973
.88 KNOCKOUT
17.0
23.5
597
2.0
51
432
5.0
127
15.5
394
41.2
1046
36.5
927
T.B . D .
33.8
859
13.3
" Z "
337
29.0
737
.875 DIA MOUNTING HOLES (4)
32.0
813
40.0
1016
REMOVE BRKT.
FOR SHIPPING
ONLY
36.9
938
EVAP
INLET/
OUTLET
18.3
464
9.6
243
WGZ150CW-200C
Packaged Chiller
331929901
WGZ MODEL
NUMBER
WGZ150C
WGZ170C
WGZ200C
CHILLER WATER
CONNECTION SIZE
(NOM) VICTAULIC
CONDENSER WATER
CONNECTION SIZE
(NOM) VICTAULIC
CENTER OF GRAVITY
IN (MM) IN (MM) X Y Z
8 (203) 5 (127) 68.7 38.6 14.9
8 (203) 5 (127) 66.3 38.3 15.0
8 (203) 5 (127) 66.6 38.7 15.1
26 WGZ 030C through 200C IMM
T
20.2
512
Chillers with Remote Condenser
Figure 12, WGZ 030CA through WGZ 060CA
" A "
INLET
25.9
657
CIRCUIT 2
OUTLET
27.4
696
41.5
1054
6.0
152
WGZ MODEL
NUMBER
WGZ030CA 2.5 (64) 21.6 (550) 4 (102) 67.3 22.8 13.3
WGZ035CA 2.5 (64) 20.6 (523) 4 (102) 68.3 23.8 13.4
WGZ040CA 2.5 (64) 19.2 (488) 4 (102) 67.9 23.9 13.5
WGZ045CA 2.5 (64) 17.5 (444) 4 (102) 67.3 24.0 13.5
WGZ050CA 2.5 (64) 15.8 (400) 4 (102) 67.2 24.5 13.5
WGZ055CA 2.5 (64) 14.0 (356) 4 (102) 66.6 24.6 13.5
WGZ060CA 2.5 (64) 12.3 (312) 4 (102) 66.1 24.7 13.6
38.2
971
MICROTECH II USER INTERFACE
CIRCUIT 1
137.0
3480
CHILLER WATER CONNECTION
30.3
770
87.9
2234
98.8
2509
11. 4
289
" Y "
" X "
12.3
312
10.4
263
1.38 DISCHARGE
CONNECTIONS
.88 LIQUID
CONNECTIONS
CONNECTIONS
REMOVABLE
DISC. HANDLE
POWER
.88 KNOCKOUTS
23.5
597
2.0
51
20.0
508
CONNECTION
.88 KNOCKOUTS
ON OPPOSITE SIDE
INLET
OUTLET
6.0
152
" Z "
ISOLATOR HOLES (4)
40.0
1016
CONTROL
34.0
864
CONDENSER WATER
SIZE (NOM) VICTAULIC
CONNECTION SIZE
(NOM) VICTAULIC
CENTER OF GRAVITY
IN (MM) A IN (MM) X Y Z
30.0
762
EVAPORATOR
60.0
1524
REMOVE BRKT.
FOR SHIPPING
ONLY
6.0
151
16.5
419
LIQUID
CONNECTIONS
EVAP. AND
DISCHARGE
CONNECTIONS
2.0
51
WGZ030-060CA
REMOTE CONDENSER UNI
331929711
IMM WGZC WGZ 030C through 200C 27
W
Figure 13, WGZ 070CA through WGZ 130CA
.
21.0
95.0
21.0
2.0
51
533
CIRCUIT 2
2413
CIRCUIT 1
533
M3M4
L3L4
30.0
762
EVAP WATER
CONNECTIONS
L1
2.0
51
M1 M2
%%c.75
19
ISOLATOR HOLES IN THE
BOTTOM OF THE BASE
CIRCUIT 1CIRCUIT 2
MICROTECH II USER INTERFACE
" Y "
" T "
INLET
"A "
137.0
3480
CONTROL BOX
" X "
32.3
L2
23.5
597
2.0
51
REMOVABLE
DISC. HANDLE
152
12.3
312
6.0
CONNECTIONS
23.2
588
POWER
.88 KNOCKOUTS
20.0
508
821
6.0
152
" Z "
ISOLATOR HOLES (4)
30.0
762
34.0
864
40.0
1016
15.5
394
CONNECTION
.88 KNOCKOUTS
ON OPPOSITE SIDE
INLET
OUTLET
60.0
1524
4.0
101
2.0
51
WGZ070-130CA
Unit less condenser
331929811
CONTROL
EVAPORATOR
REMOVE BRKT
FOR SHIPPING
ONLY
LIQUID
CONNECTIONS
EVAP. AND
DISCHARGE
CONNECTIONS
52.0
1322
OUTLET
27.3
694
12.4±.25
316±6.35
38.2
971
89.2
2266
98.8
2509
13.3
338
DISCHARGE CONNECTIONS "B"
LIQUID CONNECTIONS "C"
18.5
469
WGZ
MODEL
NUMBER
CHILLER WATER
CONNECTION SIZE
(NOM) VICTAULIC
IN (MM) A IN (MM) B DISC. C LIQ.
WGZ070C 3 (76) 14.1 (359) 4 (102) 1.38 OD 1.13 OD N/A 71.5 29.3 14.9
WGZ080C 3 (76) 13.7 (348) 4 (102) 1.62 OD 1.13 OD 6.3 (161) 74.9 30.1 15.0
WGZ090C 3 (76) 11.9 (303) 4 (102) 1.62 OD 1.13 OD 6.6 (167) 75.7 30.4 15.1
WGZ100C 3 (76) 11.0 (280) 4 (102) 1.62 OD 1.13 OD 6.6 (167) 75.2 30.6 15.2
WGZ115C 3 (76) 7.5 (190) 4 (102) 1.62 OD 1.13 OD 6.6 (167) 73.8 30.8 15.2
WGZ130C 3 (76) 4.4 (111) 4 (102) 1.62 OD 1.13 OD 6.6 (167) 72.6 30.9 15.3
COND.
WATER
CONN. SIZE
VICTAULIC
REFRIGERANT
PIPING
CONNECTION SIZE
T
LEFT
OVERHANG
CENTER OF GRAVITY
(IN.)
X Y
Z
28 WGZ 030C through 200C IMM
Figure 14, WGZ 150CA through WGZ 200CA
21.0
2.0
51
533
L4
54.0
1372
CIRCUIT 2
M5
1473
58.0
CIRCUIT 1
21.0
533
M4M6
L3
30.0
762
2.0
L1
51
CIRCUIT 2
M1 M3
.75
19
ISOLATOR HOLES IN THE
BOTTOM OF THE BASE
CIRCUIT 1
M2
CONTROL BOX
L2
3.0
76
" Y "
154.0
3912
" X "
MICROTECH II
USER INTERFACE
REMOVABLE
DISC. HANDLE
POWER
CONNECTIONS
(QTY 3)
2.0
51
.88 KNOCKOUTS
35.5
902
2.0
51
12.0
305
5.0
127
12.0
305
5.0
127
" Z "
ISOLATOR HOLES (6)
30.0
762
34.0
864
40.0
1016
75.0
1905
2.0
51
CONTROL
CONNECTION
.88 KNOCKOUTS
ON OPPOSITE SIDE
REMOVE BRKT.
FOR SHIPPING
ONLY
LIQUID
CONNECTIONS
4.0
101
23.2
588
6.0
152
33.9
862
42.1
1069
106.5
2705
119. 3
3030
1.62 O.D. DISCHARGE
CONNECTIONS
CIRCUIT 1 CIRCUIT 2
CHILLER WATER
WGZ MODEL
NUMBER
CONNECTION SIZE
(NOM) VICTAULIC
IN (MM) X Y Z
WGZ150C 8 (203) 79.1 43.2 15.3
WGZ170C 8 (203) 80.1 43.6 15.4
WGZ200C 8 (203) 79.7 44.0 15.4
OUTLETINLET
74.7
1898
CENTER OF GRAVITY
1.38 O.D. LIQUID
CONNECTIONS
24.9
631
34.2
867
17.4
443
14.5
368
DISCHARGE
2.3
CIRCUIT 1
60
EVAPORATOR
INLET/OUTLET
3.6
90
13.4
340
DISCHARGE
7.9
CIRCUIT 2
200
WGZ150-200CA
REMOTE CONDENSER UNIT
331929911
IMM WGZC WGZ 030C through 200C 29
W
Physical Data
Packaged Chillers
Table 22, WGZ 030CW – WGZ 055CW
WGZ UNIT SIZE 30 35 40 45 50 55
Unit capacity @ ARI tons, (kW) 30.0 (105.5) 34.6 (121.7) 40.7 (143.1) 45.5 (160.0) 51.4 (180.8) 56.4 (198.4)
No. Circuits 2 2 2 2 2 2
COMPRESSORS
Nominal Tons 7.5 7.5 9 9 10 10 12 12 13 13 13 15
Number Per Circuit 2 2 2 2 2 2 2 2 2 2 2 2
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, Circuit #1 in Lead 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 23 / 50 / 73 / 100
Staging, Circuit #2 in Lead 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 27 / 50 / 77 / 100
Oil Charge per Compressor oz., (l) 85 (2.5) 110 (3.3) 110 (3.3) 110 (3.3) 110 (3.3) 110 (3.3)
CONDENSER
Number 1 1 1 1 1 1
No. Refrigerant Circuits 2 2 2 2 2 2
Diameter, in., (mm) 10 (254) 10 (254) 10 (254) 10 (254) 10 (254) 10 (254)
Tube Length, in., (mm) 120 (3048) 120 (3048) 120 (3048) 120 (3048) 120 (3048) 120 (3048)
Design W.P.PSIG, (kPa):
Refrigerant Side 500 (3447) 500 (3447) 500 (3447) 500 (3447) 500 (3447) 500 (3447)
Water Side 232 (1599) 232 (1599) 232 (1599) 232 (1599) 232 (1599) 232 (1599)
Pump-Out Capacity, lb., (kg) (3) 245.8 (111.7) 245.8 (111.7) 228.2 (103.7) 228.2 (103.7) 205.4 (93.4) 205.4 (93.4)
Conn.In & Out, in, (mm) Victaulic 4 (102) 4 (102) 4 (102) 4 (102) 4 (102) 4 (102)
Relief Valve, Flare In., (mm) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9)
Purge Valve, Flare In., (mm) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7)
Vent & Drain, in. (mm) NPT ¼ (6.4) ¼ (6.4) ¼ (6.4) ¼ (6.4) ¼ (6.4) ¼ (6.4)
Liquid Subcooling Integral Integral Integral Integral Integral Integral
EVAPORATOR, BRAZED-PLATE
Number 1 1 1 1 1 1
No. Refrigerant Circuits 2 2 2 2 2 2
Water Volume, gallons, (l) 1.9 (7.1) 2.2 (8.3) 2.4 (9.1) 2.9 (11.0) 3.4 (12.8) 3.7 (14.0)
Refrig. Side D.W.P. Psig, (kPa) 450 (3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102)
Water Side D.W.P,. psig, (kPa) 653 (4500) 653 (4500) 653 (4500) 653 (4500) 653 (4500) 653 (4500)
Conn. In & Out, in. (mm) Victaulic 2.5 (65) 2.5 (65) 2.5 (65) 2.5 (65) 2.5 (65) 2.5 (65)
Relief Valve, Flare in., (mm) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9)
Vent & Drain Field Field Field Field Field Field
UNIT DIMENSIONS
Length In., (mm) 136.0 (3455) 136.0 (3455) 136.0 (3455) 136.0 (3455) 136.0 (3455) 136.0 (3455)
Width In., (mm) 32.8 (832) 32.8 (832) 32.8 (832) 32.8 (832) 32.8 (832) 32.8 (832)
Height In., (mm) 63.4 (1609) 63.4 (1609) 63.4 (1609) 63.4 (1609) 63.4 (1609) 63.4 (1609)
UNIT WEIGHTS
Operating Weight, lb., (kg) 2486 (1128) 2572 (1167) 2631 (1193) 2650 (1202) 2752 (1248) 2771 (1257)
Shipping Weight, lb., (kg) 2410 (1093) 2496 (1132) 2539 (1152) 2558 (1160) 2639 (1197) 2658 (1206)
Cir # 1,Opn. Charge, lb.,(kg) R410a 45 (20.5) 45 (20.5) 47 (21.4) 47 (21.4) 47 (21.4) 50 (22.7)
Cir # 2,Opn. Charge, lb.,(kg) R410a 45 (20.5) 45 (20.5) 47 (21.4) 47 (21.4) 47 (21.4) 50 (22.7)
Notes:
1. Certified in accordance with ARI Standard 550/590-2003.
2. 90% Full R-410a at 90°F (32°C) per unit.
30 WGZ 030C through 200C IMM
Table 23, WGZ060CW - WGZ100CW
WGZ UNIT SIZE 60 70 80 90 100
Unit capacity @ ARI tons, (kW) (1) 60.5 (212.8) 70.8 (249.0) 78.3 (275.4) 88.0 (309.5) 97.8 (344.0)
No. Circuits 2 2 2 2 2
COMPRESSORS
Nominal Tons 15 15 15/20 15/20 20 20 20 26 26 26
Number per Circuit4 2 2 2 2 2 2 2 2 2 2
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead 25 / 50 / 75 / 100 22 / 50 / 72 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100
Staging, 4 Stages, Circuit #2 in Lead 25 / 50 / 75 / 100 22 / 50 / 72 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100
Oil Charge, per compressor oz. (l) 110 (3.3)
CONDENSER
Number 1 1 1 1 1
No. Refrigerant Circuits 2 2 2 2 2
Diameter, in. (mm) 10 (254) 14 (356) 14 (356) 14 (356) 14 (356)
Tube Length, in. (mm) 120 (3048) 120 (3048) 120 (3048) 120 (3048) 120 (3048)
Design W.P., psig (kPa):
Refrigerant Side 500 (3447) 500 (3447) 500 (3447) 500 (3447) 500 (3447)
Water Side 232 (1599) 232 (1599) 232 (1599) 232 (1599) 232 (1599)
No. of Passes 2 2 2 2 2
Pump-Out Capacity lb., (kg) (3) 205.4 (93.4) 415.1 (188.7) 397.5 (180.7) 371.1 (168.7) 344.7 (156.7)
Conn. In & Out, in., (mm) Victaulic 4 (102) 4 (102) 4 (102) 4 (102) 4 (102)
Relief Valve, Flare in., (mm) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9)
Purge Valve, Flare in. (mm) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7)
Vent & Drain, in. (mm) NPT ¼ (6.4) ¼ (6.4) ¼ (6.4) ¼ (6.4) ¼ (6.4)
Liquid Subcooling Integral Integral Integral Integral Integral
EVAPORATOR, BRAZED-PLATE
Number 1 1 1 1 1
No. Refrigerant Circuits 2 2 2 2 2
Water Volume, gallons (l) 4.2 (15.9) 6.4 (24.3) 6.6 (24.9) 7.5 (28.4) 8.0 (30.2)
Refrigerant Side D.W.P., psig, (kPa) 450 (3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102)
Water Side D.W.P., psig, (kPa) 653 (4500) 653 (4500) 653 (4500) 653 (4500) 653 (4500)
Conn. In & Out, in. (mm) Victaulic 2.5 (65) 3 (76) 3 (76) 3 (76) 3 (76)
Relief Valve, Flare in., (mm) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9)
Vent & Drain Field Field Field Field Field
UNIT DIMENSIONS
Length, in. (mm) 136.0 (3455) 143.3 (3639) 149.6 (3799) 149.4 (3795) 149.4 (3795)
Width, in. (mm) 32.8 (832) 35.0 (889) 35.0 (889) 35.0 (889) 35.0 (889)
Height, in. (mm) 63.4 (1609) 65.5 (1664) 65.5 (1664) 65.5 (1664) 65.5 (1664)
UNIT WEIGHTS
Operating Wt, lb., (kg) 2801 (1271) 3887 (1763) 4302 (1951) 4507 (2044) 4678 (2122)
Shipping Wt, lb. (kg) 2688 (1219) 3746 (1699) 4145 (1880) 4327 (1963) 4474 (2029)
Cir # 1,Opn. Charge, lb, (kg) R410a 50 (22.7) 74 (34.1) 80 (36.4) 80 (36.4) 90 (40.9)
Cir # 2,Opn. Charge, lb.,(kg) R410a 50 (22.7) 74 (34.1) 80 (36.4) 80 (36.4) 90 (40.9)
110 (3.3)
158 (4.7)
Notes:
1. Certified in accordance with ARI Standard 550/590-2003.-
2. Units WGZ030 to 130 have two parallel compressors per circuit. Units WGZ150 to 200 have three parallel compressors per circuit.
3. 90% Full R-410a at 90°F (32°C) per unit.
110 (3.3)
158 (4.7)
158 (4.7)
158
(4.7)
230
(6.8)
230 (6.8)
IMM WGZC WGZ 030C through 200C 31
W
Table 24, WGZ115CW - WGZ200CW
WGZ UNIT SIZE 115 130 150 170 200
Unit capacity @ ARI. tons, (kW) (1) 112.9 (397.1) 125.4 (441.0) 146.6 (515.6) 169.3 (595.4) 188.1 (661.5)
No. Circuits 2 2 2 2 2
COMPRESSORS
Nominal Tons 26/30 26/30 30 30 26 26 26 30 30 30
Number Per Circuit 2 2 2 2 3 3 3 3 3 3
CAPACITY REDUCTION STEPS - PERCENT OF COMPRESSOR DISPLACEMENT
Staging, 4 Stages, Circuit #1 in Lead 22 / 50 / 72 / 100 25 / 50 / 75 / 100
Staging, 4 Stages, Circuit #2 in Lead 22 / 50 / 72 / 100 25 / 50 / 75 / 100
Oil Charge, per compressor oz. (l)
CONDENSER
Number 1 1 1 1 1
No. Refrigerant Circuits 2 2 2 2 2
Diameter, in. (mm) 14 (356) 14 (356) 16 (406.4) 16 (406.4) 16 (406.4)
Tube Length, in. (mm) 120 (3048) 120 (3048) 144 (3658) 144 (3658) 144 (3658)
Design W.P., psig (kPa):
Refrigerant Side 500 (3447) 500 (3447) 500 (3447) 500 (3447) 500 (3447)
Water Side 232 (1599) 232 (1599) 232 (1599) 232 (1599) 232 (1599)
Pump-Out Capacity lb., (kg) (3) 344.7 (156.7) 344.7 (156.7) 572.3 (260.1) 508.9 (231.3) 508.9 (231.3)
Water Conn In & Out, in., (mm) (4) 4 (102) 4 (102) 5 (127) 5 (127) 5 (127)
Relief Valve, Flare in., (mm) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9)
Purge Valve, Flare in. (mm) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7)
Vent & Drain, in. (mm) FPT ¼ 6.4) ¼ 6.4) ¼ 6.4) ¼ 6.4) ¼ 6.4)
Liquid Subcooling Integral Integral Integral Integral Integral
EVAPORATOR, BRAZED-PLATE
Number 1 1 1 1 1
No. Refrigerant Circuits 2 2 2 2 2
Water Volume, gallons (l) 8.5 (32.1) 10.5 (39.7) 57.6 (218.0) 56.9 (215.4) 56.9 (215.4)
Refrigerant Side D.W.P., psig, (kPa) 450 (3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102)
Water Side D.W.P., psig, (kPa) 653 (4500) 653 (4500) 150 (1034) 150 (1034) 150 (1034)
Water Conn.In & Out, in. (mm) Victaulic 3 (76) 3 (76) 8 (203) 8 (203) 8 (203)
Relief Valve, Flare in., (mm) ⅝ (15.9) ⅝ (15.9)
Drain & Vent size, in. (mm) Field Field ½ (12.7) ½ (12.7) ½ (12.7)
UNIT DIMENSIONS
Length, in. (mm) 149.4 (3795) 149.4 (3795) 170.2 (4322)
Width, in. (mm) 35.0 (889) 35.0 (889) 36.5 (927) 36.5 (927) 36.5 (927)
Height, in. (mm) 65.5 (1664) 65.5 (1664) 77.7 (1973) 77.7 (1973) 77.7 (1973)
UNIT WEIGHTS
Operating Wt, lb., (kg) 4712 (2137) 4772 (2165) 7370 (3343)
Shipping Wt, lb. (kg) 4508 (2045) 4568 (2072) 6581 (2985) 6921 (3139) 7036 (3192)
Cir #1, Op. Charge, lb., (kg) R-410a 100 (45.5) 100 (45.5) 150 (68.2) 150 (68.2) 150 (68.2)
Cir #2, Op. Charge, lb., (kg) R-410a 100 (45.5) 100 (45.5) 150 (68.2) 150 (68.2) 150 (68.2)
230 (6.8 )/
213 (6.3)
230 (6.8 )/
213 (6.3)
213 (6.3) 230 (6.8) 230 (6.8) 213 (6.3) 213 (6.3)
17 / 33 / 50 / 67
/ 83 / 100
17 / 33 / 50 / 67
83 / 100
SHELL-AND-TUBE
15 / 33 / 48 / 67 /
81 / 100
19 / 33 / 52 / 67
86 /100
170.2 (4322)
7758 (3519)
17 / 33 / 50 / 67 /
83 / 100
17 / 33 / 50 / 67 /
83 / 100
170.2 (4322)
7873 (3571)
Notes:
1. Certified in accordance with ARI Standard 550/590-2003.
2. Units WGZ030 to 130 have two parallel compressors per circuit, units WGZ150 to 200 have three parallel compressors per circuit.
3. 90% Full R-410a at 90°F (32°C) per unit.
32 WGZ 030C through 200C IMM
Chillers with Remote Condenser
Table 25, WGZ030CA - WGZ055CA
WGZ UNIT SIZE 30 35 40 45 50 55
Tons, (kW), 44°F LWT, 125°F SDT 26.6 (93.5) 30.5 (107.3) 35.2 (123.8) 39.8 (139.9) 45.8 (161.0) 50.3 (176.8)
No. Circuits 2 2 2 2 2 2
COMPRESSORS
Nominal Tons 7.5 7.5 9 9 10 10 12 12 13 13 13 15
Number per Circuit 2 2 2 2 2 2 2 2 2 2 2 2
Staging, Circuit #1 in Lead 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 23 / 50 / 73 / 100
Staging, Circuit #2 in Lead 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 27 / 50 / 77 / 100
Oil Charge, per comp. oz, (l) 85 (2.5) 110 (3.3) 110 (3.3) 110 (3.3) 110 (3.3) 110 (3.3)
EVAPORATOR, BRAZED PLATE
No. Refrigerant Circuits 2 2 2 2 2 2
Water Volume, gallons, (l) 1.9 (7.1) 2.2 (8.3) 2.4 (9.1) 2.9 (11.0) 3.4 (12.8) 3.7 (14.0)
Refrig. Side D.W.P. Psig, (kPa) 450 (3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102)
Water Side D.W.P. Psig, (kPa) 653 (4500) 653 (4500) 653 (4500) 653 (4500) 653 (4500) 653 (4500)
Inlet & Outlet, in., (mm) (1) 2.5 (65) 2.5 (65) 2.5 (65) 2.5 (65) 2.5 (65) 2.5 (65)
Relief Valve, Flare in., (mm) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9)
Drain & Vent Field Field Field Field Field Field
UNIT DIMENSIONS
Length In., (mm) 137.0 (3480) 137.0 (3480) 137.0 (3480) 137.0 (3480) 137.0 (3480) 137.0 (3480)
Width In., (mm) 34.0 (864) 34.0 (864) 34.0 (864) 34.0 (864) 34.0 (864) 34.0 (864)
Height In., (mm) 60.0 (1524) 60.0 (1524) 60.0 (1524) 60.0 (1524) 60.0 (1524) 60.0 (1524)
UNIT WEIGHTS
Operating Weight, lb., (kg) 1606 (728) 1698 (770) 1715 (778) 1738 (788) 1773 (804) 1795 (814)
Shipping Weight, lb., (kg) 1580 (717) 1670 (758) 1685 (764) 1704 (773) 1735 (787) 1754 (796)
Holding charge/ circuit, lb. (kg) 10.0 (4.5) 10.0 (4.5) 10.0 (4.5) 10.0 (4.5) 10.0 (4.5) 10.0 (4.5)
Table 26, WGZ060CA - WGZ100CA
WGZ UNIT SIZE 60 70 80 90 100
Tons, (kW) 44°F LWT, 125°F SDT 53.9 (189.5) 61.3 (215.7) 68.6 (242.0) 77.7 (273.3) 86.6 (304.5)
No. Circuits 2 2 2 2 2
COMPRESSORS
Nominal Tons 15 15 15/20 15/20 20 20 20 26 26 26
Number Per Circuit 2 2 2 2 2 2 2 2 2 2
Staging, Circuit #1 in Lead 25 / 50 / 75 / 100 22 / 50 / 72 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100
Staging, Circuit #2 in Lead 25 / 50 / 75 / 100 22 / 50 / 72 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100
Oil Charge, per compressor oz. (l) 110 (3.3)
EVAPORATOR, BRAZED PLATE
No. Refrigerant Circuits 2 2 2 2 2
Water Volume, gallons (l) 4.2 (15.9) 6.4 (24.3) 6.6 (24.9) 7.5 (28.4) 8.0 (30.2)
Refrigerant Side D.W.P., psig, (kPa) 450 (3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102)
Water Side D.W.P., psig, (kPa) 653 (4500) 653 (4500) 653 (4500) 653 (4500) 653 (4500)
Inlet & Outlet, in. (mm) (2) 2.5 (63) 3 (76) 3 (76) 3 (76) 3 (76)
Relief Valve, Flare in., (mm) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9)
Drain & Vent Field Field Field Field Field
UNIT DIMENSIONS
Length, in. (mm) 137.0 (3480) 137.0 (3480) 137.0 (3480) 137.0 (3480) 137.0 (3480)
Width, in. (mm) 34.0 (864) 34.0 (864) 34.0 (864) 34.0 (864) 34.0 (864)
Height, in. (mm) 60.0 (1524) 60.0 (1524) 60.0 (1524) 60.0 (1524) 60.0 (1524)
UNIT WEIGHTS
Operating Wt, lb., (kg) 1816 (824) 2474 (1122) 2787 (1264) 2928 (1328) 3050 (1383)
Shipping Wt, lb. (kg) 1771 (803) 2406 (1091) 2717 (1232) 2851 (1293) 2968 (1346)
Holding charge/ circuit, lb. (kg) 10.0 (4.5) 15 (6.8) 15 (6.8) 15 (6.8) 15 (6.8)
Notes:
1. Condenser and field piping not included.
110 (3.3)
158 (4.7) 158 (4.7)
230
230 (6.8)
IMM WGZC WGZ 030C through 200C 33
W
Table 27, WGZ115CA – WGZ200CA
WGZ UNIT SIZE 115 130 150 170 200
Tons, (kW)44°F LWT, 125°F SDT 100.1 (352.2) 111.4 (391.7) 129.9 (456.8) 150.2 (528.3) 170.6 (599.8)
No. Circuits 2 2 2 2 2
COMPRESSORS
Nominal Tons 26/30 26/30 30 30 26 26 26 30 30 30
Number Per Circuit 2 2 2 2 3 3 3 3 3 3
Staging, Circuit #1 in Lead 22 / 50 / 72 / 100 25 / 50 / 75 / 100
Staging, Circuit #2 in Lead 22 / 50 / 72 / 100 25 / 50 / 75 / 100
Oil Charge, per compressor oz. (l)
EVAPORATOR, BRAZED PLATE------------------------------------------------
No. Refrigerant Circuits 2 2 2 2 2
Water Volume, gallons (l) 8.5 (32.1) 10.5 (39.7) 57.6 (218.0) 56.9 (215.4) 56.9 (215.4)
Refrigerant Side D.W.P., psig,
Water Side D.W.P., psig, (kPa) 653 (4500) 653 (4500) 150 (1034) 150 (1034) 150 (1034)
Water Connections:
In & Out, in. (mm), victaulic 3 (76) 3 (76) 8 (203) 8 (203) 8 (203)
Relief Valve, Flare in., (mm) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9) ⅝ (15.9)
Drain & Vent Field Field ½ (12.7) ½ (12.7) ½ (12.7)
UNIT DIMENSIONS
Length, in. (mm) 137.0 (3480) 137.0 (3480) 154.0 (3912) 154.0 (3912) 154.0 (3912)
Width, in. (mm) 34.0 (864) 34.0 (864) 34.0 (864) 34.0 (864) 34.0 (864)
Height, in. (mm) 60.0 (1524) 60.0 (1524) 75.0 (1905) 75.0 (1905) 75.0 (1905)
UNIT WEIGHTS
Operating Wt, lb., (kg) 3120 (1415) 3194 (1449) 5279 (2395) 5385 (2443) 5498 (2494)
Shipping Wt, lb. (kg) 3035 (1377) 3091 (1402) 4779 (2168) 4891 (2219) 5004 (2270)
Holding charge/ circuit, lb. (kg) 15 (6.8) 15 (6.8) 20 (9.1) 20 (9.1) 20 (9.1)
Notes:
1. Condenser and field piping not included
230 (6.8 )
213 (6.3)
450 (3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102)
213 (6.3) 230 (6.8) 230 (6.8) 213 (6.3) 213 (6.3)
17 / 33 / 50 / 67 /
83 / 100
17 / 33 / 50 / 67 /
83 / 100
SHELL-AND-TUBE
15 / 33 / 48 / 67 /
81 / 100
19 / 33 / 52 / 67 /
86 / 100
17 / 33 / 50 / 67 /
83 / 100
17 / 33 / 50 / 67 /
83 / 100
Operating Limits
Equipment room temperature limits, operating or standby: 32F to 104F (0C to 40C)
Maximum allowable condenser water pressure is 232 psig (1599 kPa).
Maximum design saturated discharge temperature is 140°F (60°C).
Maximum allowable water temperature to cooler in a non-operating cycle is 100°F (37.8°C). Maximum
entering water temperature for operating cycle is 90°F (32.2°C) (during system changeover from heating to
cooling cycle).
Minimum leaving water temperature from the cooler without freeze protection is 40°F (4.4°C).
Minimum entering tower condenser water temperature is 60°F (15.6°C).
For remote air-cooled condensers, the temperature difference between the saturated discharge temperature
and the outside air temperature (TD) must be between 15 and 35 degrees F and the saturated discharge
temperature cannot exceed 135F.
34 WGZ 030C through 200C IMM
Components
Figure 15, Compressor Locations
423
1
Evaporator
Evaporator and
Condenser
Connections
Circuit 2 Circuit 1
Control Panel
NOTE: Models WGZ 150 to 200 add a #5 compressor to circuit #1 and a #6 compressor to
circuit #2.
Table 28, Major Components
WGZ-C
Unit
Size
30
35
40
45
50
55
60
70
80
90
100
115
130
150
170
200
System #1 System #2 Expansion Valve
Comp. #1 Comp. #3 Comp. #2 Comp. #4
ZP90KCE ZP90KCE ZP90KCE ZP90KCE ACH130-90DQ C1010-47 OZE-20-GA-BP15 OZE-20-GA-BP15
ZP103KCE ZP103KCE ZP103KCE ZP103KCE ACH130-102DQ C1010-47 OZE-20-GA-BP15 OZE-20-GA-BP15
ZP120KCE ZP120KCE ZP120KCE ZP120KCE ACH130118DQ C1010-57 OZE-20-GA-BP15 OZE-20-GA-BP15
ZP137KCE ZP137KCE ZP137KCE ZP137KCE ACH130-138DQ C1010-57 OZE-25-GA-BP15 OZE-25-GA-BP15
ZP154KCE ZP154KCE ZP154KCE ZP154KCE ACH130-158DQ C1010-70 OZE-25-GA-BP15 OZE-25-GA-BP15
ZP154KCE ZP154KCE ZP182KCE ZP182KCE ACH130-178DQ C1010-70 OZE-25-GA-BP15 OZE-35-GA-BP15
ZP182KCE ZP182KCE ZP182KCE ZP182KCE ACH130-198DQ C1010-70 OZE-35-GA-BP15 OZE-35-GA-BP15
ZP182KCE ZP235KCE ZP182KCE ZP235KCE ACH250-122DQ C1410-88 OZE-35-GA-BP15 OZE-35-GA-BP15
ZP235KCE ZP235KCE ZP235KCE ZP235KCE ACH350-126DQ C1410-98 OZE-50-GA-BP15 OZE-50-GA-BP15
ZP235KCE ZP235KCE ZP295KCE ZP295KCE ACH350-142DQ C1410-113 OZE-50-GA-BP15 OZE-50-GA-BP15
ZP295KCE ZP295KCE ZP295KCE ZP295KCE ACH350-152DQ C1410-128 OZE-50-GA-BP15 OZE-50-GA-BP15
ZP295KCE ZP385KCE ZP295KCE ZP385KCE ACH350-182DQ C1410-128 OZE-60-GA-BP15 OZE-60-GA-BP15
ZP385KCE ZP385KCE ZP385KCE ZP385KCE ACH350-210DQ C1410-128 OZE-60-GA-BP15 OZE-60-GA-BP15
(3) ZP295KCE (3) ZP295KCE EV34191111/9NS C1612-156 SEHI100-30-S SEHI100-30-S
(3) ZP295KCE (3) ZP385KCE EV34191212/7NS C1612-186 SEHI100-30-S SEHI100-30-S
(3) ZP385KCE (3) ZP385KCE EV34191212/7NS C1612-186 SEHI100-30-S SEHI100-30-S
Evap.
Vessel
Size
Cond.
Vessel
Size
System #1 System #2
IMM WGZC WGZ 030C through 200C 35
Wiring
Field Wiring, Power
The WGZ “C” vintage chillers are supplied standard with compressor contactors and power terminal block,
designed for multi-point power supply to the unit, no compressor circuit breakers. Available options are:
Single-point connection to power block with compressor circuit breakers
Single-point connection to disconnect switch with compressor circuit breakers
High short circuit current rating with single-point disconnect switch
Multi-point connection to disconnect switch, no compressor circuit breakers
A factory installed control circuit transformer is standard. Optionally, a field-installed control power source
can be wired to the unit.
Wiring and conduit selections must comply with the National Electrical Code and/or local requirements.
An open fuse indicates a short, ground, or overload. Before replacing a fuse or restarting a compressor, the
trouble must be found and corrected. Tables in the Electrical Data section (page
information on recommended wire sizes.
Unit power inlet wiring must enter the control box through the right side. A 7/8-inch pilot knockout is
provided. (Refer to control panel picture on page
NOTE: Use only copper supply conductors. Terminations are sized for copper only.
55 for general location of power inlet.)
Field Wiring, Control
A factory-mounted control transformer supplies the correct control circuit voltage.
The transformer power leads are connected to the power block PB1 or disconnect switch DS1.
38) give specific
Interlock Wiring, Condenser Pump Starter or Air Cooled Condenser Fan Starter
Provisions are made for interlocking a condenser pump starter, tower fans, a tower bypass valve, or up to
eight air-cooled condenser fan contactors to be controlled by the MicroTech II unit controller. Condenser
fan operation can also be controlled by pressure switches supplied with the condenser. Coil voltage must be
115 volts with a maximum of 20 VA.
An evaporator and condenser (water-cooled units only) flow switch is necessary on all units. It is also
advisable to wire a chilled water pump interlock in series with the flow switch for additional freeze
protection.
Control wiring must enter the control box through a 7/8-inch knockout provided on the panel upper left
side.
Ambient Air Sensor
Units with a remote air-cooled condenser will have an outdoor air sensor furnished with the unit, inside the
control panel and wired to the correct terminals. It must be installed outdoors in a location that will give the
true outdoor temperature that the condenser coils will see. Splicing of the sensor lead may be required. The
sensor must be installed for the unit to operate.
Optional Remote Interface Panel
The box containing the optional remote interface panel will have installation instructions, IOM- MT II
Remote, in it.
36 WGZ 030C through 200C IMM WGZC
Unit Configuration
WGZ 030CW to 130CW have two refrigerant circuits, two tandem scroll compressors (total of four), a
single two-circuited brazed plate evaporator, a single two-circuited water-cooled condenser,
interconnecting refrigerant piping and a control panel with associated sensors and transducers. Models
WGZ 150CW to 200CW have two trio-compressors (total of 6) and a shell-and-tube evaporator.
Table 29, Schematic Piping Diagram (One of Two Circuits)
Chilled
Wate r
LWT
Evaporator
S
Legend:
T
T
Temperature Sensor
P
T
Pressure Transducer
P
Pressure (High Pressure Cutout)
1
T
T
P
CV
Condenser
S
F-D
S
T
SP
1
Comp
#1
Relief Valve
Schrader Fitting
Thermal Expansion Valve
Comp
#2
T
S
Condenser
Wate r
NOTE: Standard condenser
connections are on the
control panel end.
Temperataure Sensor, Leaving
LWT
Chilled Water Control
S
Solenoid Valve
F-D
Filter-Drier
Sight Glass / Moisture Indicator
CV
Charging Valve
Angle Valve
Ball Valve
IMM WGZC WGZ 030C through 200C 37
W
Electrical Data
Table 30, Compressor Amp Draw
WGZ
Unit
Volts
Size
208 29.5 29.5 - 29.5 29.5 - 22.4 22.4 - 22.4 22.4 - 195 195 - 195 195 -
230 29.5 29.5 - 29.5 29.5 - 20.0 20.0 - 20.0 20.0 - 195 195 - 195 195 -
030
460 14.7 14.7 - 14.7 14.7 - 12.0 12.0 - 12.0 12.0 - 95 95 - 95 95 -
575 12.2 12.2 - 12.2 12.2 - n/a n/a - n/a n/a - 80 80 - 80 80 -
208 30.1 30.1 - 30.1 30.1 - 25.0 25.0 - 25.0 25.0 - 225 225 - 225 225 -
230 30.1 30.1 - 30.1 30.1 - 23.2 23.2 - 23.2 23.2 - 225 225 - 225 225 -
035
460 16.7 16.7 - 16.7 16.7 - 12.0 12.0 - 12.0 12.0 - 114 114 - 114 114 -
575 12.2 12.2 - 12.2 12.2 - n/a n/a - n/a n/a - 80 80 - 80 80 -
208 33.3 33.3 - 33.3 33.3 - 28.6 28.6 - 28.6 28.6 - 239 239 - 239 239 -
230 33.3 33.3 - 33.3 33.3 - 25.6 25.6 - 25.6 25.6 - 239 239 - 239 239 -
040
460 17.9 17.9 - 17.9 17.9 - 12.8 12.8 - 12.8 12.8 - 125 125 - 125 125 -
575 12.8 12.8 - 12.8 12.8 - n/a n/a - n/a n/a - 80 80 - 80 80 -
208 48.1 48.1 - 48.1 48.1 - 30.5 30.5 - 30.5 30.5 - 245 245 - 245 245 -
230 48.1 48.1 - 48.1 48.1 - 28.0 28.0 - 28.0 28.0 - 245 245 - 245 245 -
045
460 18.6 18.6 - 18.6 18.6 - 14.4 14.4 - 14.4 14.4 - 125 125 - 125 125 -
575 14.7 14.7 - 14.7 14.7 - 12.0 12.0 - 12.0 12.0 - 100 100 - 100 100 -
208 51.3 51.3 - 51.3 51.3 - 36.0 36.0 - 36.0 36.0 - 300 300 - 300 300 -
230 51.3 51.3 - 51.3 51.3 - 32.8 32.8 - 32.8 32.8 - 300 300 - 300 300 -
050
460 23.1 23.1 - 23.1 23.1 - 16.8 16.8 - 16.8 16.8 - 150 150 - 150 150 -
575 19.9 19.9 - 19.9 19.9 - 13.6 13.6 - 13.6 13.6 - 109 109 - 109 109 -
208 51.3 51.3 - 55.8 55.8 - 36.0 36.0 - 44.0 44.0 - 300 300 - 340 340 -
230 51.3 51.3 - 55.8 55.8 - 32.8 32.8 - 40.0 40.0 - 300 300 - 340 340 -
055
460 23.1 23.1 - 26.9 26.9 - 16.8 16.8 - 20.0 20.0 - 150 150 - 173 173 -
575 19.9 19.9 - 23.7 23.7 - 13.6 13.6 - 16.0 16.0 - 109 109 - 26.9 26.9 -
208 55.8 55.8 - 55.8 55.8 - 44.0 44.0 - 44.0 44.0 - 340 340 - 340 340 -
230 55.8 55.8 - 55.8 55.8 - 40.0 40.0 - 40.0 40.0 - 340 340 - 340 340 -
060
460 26.9 26.9 - 26.9 26.9 - 20.0 20.0 - 20.0 20.0 - 173 173 - 173 173 -
575 23.7 23.7 - 23.7 23.7 - 16.0 16.0 - 16.0 16.0 - 132 132 - 132 132 -
208 55.8 73.9 - 55.8 73.9 - 44.0 54.4 - 44.0 54.4 - 340 505 - 340 505 -
230 55.8 73.9 - 55.8 73.9 - 40.0 49.6 - 40.0 49.6 - 340 505 - 340 505 -
070
460 26.9 30.4 - 26.9 30.4 - 20.0 24.8 - 20.0 24.8 - 173 225 - 173 225 -
575 23.7 24.6 - 23.7 24.6 - 16.0 20.0 - 16.0 20.0 - 132 180 - 132 180 -
208 73.9 73.9 - 73.9 73.9 - 54.4 54.4 - 54.4 54.4 - 505 505 - 505 505 -
230 73.9 73.9 - 73.9 73.9 - 49.6 49.6 - 49.6 49.6 - 505 505 - 505 505 -
080
460 30.4 30.4 - 30.4 30.4 - 24.8 24.8 - 24.8 24.8 - 225 225 - 225 225 -
575 24.6 24.6 - 24.6 24.6 - 20.0 20.0 - 20.0 20.0 - 180 180 - 180 180 -
208 73.9 73.9 - 89.1 89.1 - 54.4 54.4 - 64.8 64.8 - 505 505 - 544 544 -
230 73.9 73.9 - 89.1 89.1 - 49.6 49.6 - 58.4 58.4 - 505 505 - 544 544 -
090
460 30.4 30.4 - 41.9 41.9 - 24.8 24.8 - 29.6 29.6 - 225 225 - 272 272 -
575 24.6 24.6 - 32.1 32.1 - 20.0 20.0 - 23.2 23.2 - 180 180 - 218 218 -
208 89.1 89.1 - 89.1 89.1 - 64.8 64.8 - 64.8 64.8 - 544 544 - 544 544 -
230 89.1 89.1 - 89.1 89.1 - 58.4 58.4 - 58.4 58.4 - 544 544 - 544 544 -
100
460 41.9 41.9 - 41.9 41.9 - 29.6 29.6 - 29.6 29.6 - 272 272 - 272 272 -
575 32.1 32.1 - 32.1 32.1 - 23.2 23.2 - 23.2 23.2 - 218 218 - 218 218 -
Rated Load Amps Per Compressor Rated Load Amps Per Compressor Locked Rotor Amps
Standard Unit w/o Ext. OL's Optional Unit with Ext. OL's Across-The-Line Starting
Circuit 1 Circuit 2 Circuit 1 Circuit 2 Circuit 1 Circuit 2
No.1 No.3 No.5 No.2 No.4 No.6 No.1 No.3 No.5 No.2 No.4 No.6 No.1 No.3 No.5 No.2 No.4 No.6
38 WGZ 030C through 200C IMM
Table 30, Compressor Amp Draw, Continued
WGZ
Unit
Volts
Size
208 89.1 109.6 - 89.1 109.6 - 64.8 86.3 - 64.8 86.3 - 544 599 - 544 599 -
230 89.1 109.6 - 89.1 109.6 - 58.4 78.0 - 58.4 78.0 - 544 599 - 544 599 -
115
460 41.9 54.5 - 41.9 54.5 - 29.6 39.0 - 29.6 39.0 - 272 310 - 272 310 -
575 32.1 49.4 - 32.1 49.4 - 23.2 31.2 - 23.2 31.2 - 218 239 - 218 239 -
208 109.6 109.6 - 109.6 109.6 - 83.2 86.3 - 83.2 86.3 - 599 599 - 599 599 -
230 109.6 109.6 - 109.6 109.6 - 75.2 78.0 - 75.2 78.0 - 599 599 - 599 599 -
130
460 54.5 54.5 - 54.5 54.5 - 37.6 39.0 - 37.6 39.0 - 310 310 - 310 310 -
575 49.4 49.4 - 49.4 49.4 - 30.4 31.2 - 30.4 31.2 - 239 239 - 239 239 -
208 89.1 89.1 89.1 89.1 89.1 89.1 64.8 64.8 64.8 64.8 64.8 64.8 544 544 544 544 544 544
230 89.1 89.1 89.1 89.1 89.1 89.1 58.4 58.4 58.4 58.4 58.4 58.4 544 544 544 544 544 544
150
460 41.9 41.9 41.9 41.9 41.9 41.9 29.6 29.6 29.6 29.6 29.6 29.6 272 272 272 272 272 272
575 32.1 32.1 32.1 32.1 32.1 32.1 23.2 23.2 23.2 23.2 23.2 23.2 218 544 218 218 218 218
208 89.1 89.1 89.1 109.6 109.6 109.6 64.8 64.8 64.8 86.3 86.3 86.3 544 544 544 599 599 599
230 89.1 89.1 89.1 109.6 109.6 109.6 58.4 58.4 58.4 78.0 78.0 78.0 544 544 544 599 599 599
170
460 41.9 41.9 41.9 54.5 54.5 54.5 29.6 29.6 29.6 39.0 39.0 39.0 272 272 272 310 310 310
575 32.1 32.1 32.1 49.4 49.4 49.4 23.2 23.2 23.2 31.2 31.2 31.2 218 544 218 239 239 239
208 109.6 109.6 109.6 109.6 109.6 109.6 86.3 86.3 86.3 86.3 86.3 86.3 599 599 599 599 599 599
230 109.6 109.6 109.6 109.6 109.6 109.6 78.0 78.0 78.0 78.0 78.0 78.0 599 599 599 599 599 599
200
460 54.5 54.5 54.5 54.5 54.5 54.5 39.0 39.0 39.0 39.0 39.0 39.0 310 310 310 310 310 310
575 49.4 49.4 49.4 49.4 49.4 49.4 31.2 31.2 31.2 31.2 31.2 31.2 239 239 239 239 239 239
NOTES:
1. Compressor RLA values are for wire sizing purposes only and do not reflect normal operating current draw.
2. External compressor overloads only available on packaged water-cooled units, except Models WGZ 030CW – 040CW @ 575V
Rated Load Amps Per Compressor Rated Load Amps Per Compressor Locked Rotor Amps
Standard Unit w/o Ext. OL's Optional Unit with Ext. OL's Across-The-Line Starting
Circuit 1 Circuit 2 Circuit 1 Circuit 2 Circuit 1 Circuit 2
No.1 No.3 No.5 No.2 No.4 No.6 No.1 No.3 No.5 No.2 No.4 No.6 No.1 No.3 No.5 No.2 No.4 No.6
Table 31, Maximum Fuse Size
Maximum Fuse Size
WGZ
Unit
Size
030
035
040
045
Voltage
3-Phase
208 150 110 90 90 70 70
230 150 100 90 90 60 60
460 70 60 45 45 35 35
575 60 N/A 35 35 N/A N/A
208 150 125 90 90 80 80
230 150 110 90 90 70 70
460 80 60 50 50 35 35
575 60 N/A 35 35 N/A N/A
208 175 150 100 100 90 90
230 175 125 100 100 80 80
460 90 60 50 50 40 40
575 60 N/A 40 40 N/A N/A
208 250 150 150 150 90 90
230 250 125 150 150 90 90
460 90 70 60 60 45 45
575 70 60 45 45 35 35
Power Supply Power Supply Power Supply Power Supply
without Ext. OL's with Ext. OL's Without Ext. OL's With External OL's
Single Point Multiple Point
Total Unit Total Unit Circ.#1 Circ.#2 Circ.#1 Circ.#2
IMM WGZC WGZ 030C through 200C 39
Table 31, Maximum Fuse Size, Continued
WGZ
Unit Size
050
055
060
070
080
090
100
115
130
150
170
200
NOTE :"Maximum Fuse Sizes" are selected at approximately 225% of the largest compressor RLA, plus 100% of all other loads.
Voltage
3-Pha
208 250 175 150 150 110 110
230 250 150 150 150 100 100
460 110 80 70 70 50 50
575 100 70 60 60 40 40
208 250 200 150 175 115 125
230 250 175 150 175 100 125
460 125 90 70 80 50 60
575 110 70 60 70 40 50
208 250 225 175 175 125 125
230 250 200 175 175 125 125
460 125 100 80 80 60 60
575 110 80 70 70 50 50
208 350 250 200 200 150 150
230 350 225 200 200 150 150
460 150 110 90 90 70 70
575 125 90 70 70 60 60
208 350 250 225 225 175 175
230 350 250 225 225 150 150
460 150 125 90 90 80 80
575 125 100 80 80 60 60
208 400 300 225 250 175 200
230 400 250 225 250 150 175
460 175 125 90 125 80 90
575 150 110 80 100 60 70
208 450 300 250 250 200 200
230 450 300 250 250 175 175
460 200 150 125 125 90 90
575 150 110 100 100 70 70
208 500 400 300 300 250 250
230 500 350 300 300 225 225
460 250 175 150 150 110 110
575 200 125 125 125 90 90
208 500 400 350 350 250 250
230 500 350 350 350 250 250
460 250 175 175 175 125 125
575 250 150 150 150 100 90
208 600 450 350 350 250 250
230 600 400 350 350 225 225
460 300 200 175 175 125 125
575 225 150 125 125 90 90
208 700 500 350 450 250 350
230 700 450 350 450 225 300
460 350 225 175 225 125 150
575 300 175 125 200 90 125
208 700 600 450 450 350 350
230 700 500 450 450 300 300
460 350 250 225 225 150 150
575 350 200 200 200 125 125
Power Supply Power Supply Power Supply Power Supply
without Ext. OL's with Ext. OL's Without Ext. OL's With External OL's
Total Unit Total Unit Circ.#1 Circ.#2 Circ.#1 Circ.#2
Single Point Multiple Point
40 WGZ 030C through 200C IMM WGZC
Table 32, Wire Sizing Amps, Single Point Power
WGZ
Unit
Size
030
035
040
045
050
055
060
070
080
090
Minimum Circuit Ampacity
Volts
208 126 95 3 #1 3 #3
230 126 85 3 #1 3 #4
460 63 51 3 #6 (Note 1) 3 #6 (Note 1
575 52 N/A 3 #6 (Note 1 -- --
208 128 106 3 #1 3 #2
230 128 99 3 #1 3 #3
460 71 51 3 #6 (Note 1 3 #6 (Note 1
575 52 N/A 3 #6 (Note 1 -- --
208 142 120 3 1/0 3 #1
230 142 109 3 1/0 3 #2
460 76 55 3 #6 (Note 1 3 #6 (Note 1
575 55 N/A 3 #6 (Note 1 -- --
208 205 130 3 4/0 3 #1
230 205 118 3 4/0 3 #1
460 79 62 3 #4 3 #6 (Note 1
575 63 51 3 #6 (Note 1 3 #6 (Note 1
208 218 153 3 4/0 3 2/0
230 218 140 3 4/0 3 1/0
460 98 72 3 #3 3 #4
575 85 58 3 #4 3 #6 (Note 1
208 228 171 3 4/0 3 2/0
230 228 156 3 4/0 3 2/0
460 107 79 3 #2 3 #4
575 93 63 3 #3 3 #6 (Note 1
208 237 187 3 250 3 3/0
230 237 170 3 250 3 2/0
460 114 85 3 #2 3 #4
575 101 68 3 #2 3 #4
208 278 211 3 300 3 4/0
230 278 192 3 300 3 3/0
460 122 96 3 #1 3 #3
575 103 77 3 #2 3 #4
208 314 232 3 400 3 250
230 314 211 3 400 3 4/0
460 129 106 3 #1 3 #2
575 105 85 3 #2 3 #4
208 348 255 3 500 3 250
230 348 231 3 500 3 250
460 155 116 3 2/0 3 #1
575 122 92 3 #1 3 #3
Single Point
Power Supply
Without Ext
OL's (Note #3)
(MCA)
Single Point
Power Supply
With Ext OL's
(Note #3)
Power Supply Power Supply
Field
Wire
Quantity
Without External OL's With External Overloads
Continued next page.
Wire Gauge
75C
Field Wire
Quantity
Wire Gauge
75C
IMM WGZC WGZ 030C through 200C 41
32, Wire Sizing Amps, Single Point Power, Continued
Minimum Circuit Ampacity (MCA) Power Supply Power Supply
WGZ
Unit
Size
Volts
Single Point
Power Supply
Without Ext OL's
(Note #3)
Single Point
Power Supply
With Ext OL's
(Note #3)
Field Wire
Quantity
Wire Gauge
75C
Field Wire
Quantity
Wire Gauge
75C
Without External OL's With External Overloads
208 379 276 3 500 3 300
100
230 379 248 3 500 3 250
460 178 126 3 3/0 3 #1
575 136 99 3 1/0 3 #3
208 427 324 6 (2) 4/0 3 400
115
230 427 292 6 (2) 4/0 3 400
460 208 147 3 4/0 3 1/0
575 176 117 3 3/0 3 #1
208 467 367 6 (2) 250 3 500
130
230 467 332 6 (2) 250 3 400
460 233 166 3 250 3 2/0
575 210 133 3 4/0 3 1/0
208 557 405 6 (2) 300 6 (2) 4/0
150
230 557 365 6 (2) 300 3 500
460 262 185 3 300 3 3/0
575 201 145 3 4/0 3 1/0
208 624 475 6 (2) 400 6 (2) 250
170
230 624 429 6 (2) 400 6 (2) 4/0
460 303 216 3 350 3 4/0
575 257 171 3 300 3 2/0
208 685 540 6 (2) 500 6 (2) 300
200
230 685 486 6 (2) 500 6 (2) 250
460 341 244 3 500 3 250
575 309 195 3 350 3 3/0
NOTES:
1. Field wire size must be #4 AWG if High Interrupt Switch or HSCCR is ordered
2. Unit wire sizing amps (MCA) are equal to 125% of the largest compressor-motor RLA plus 100% of RLA of all other loads in the circuit.
3. Single point power supply requires a single fused disconnect to supply electrical power to the unit.
4. Multiple point power supply requires two independent power supplies, each with separate fused disconnects. The control circuit will be
wired to Circuit #1 from the factory).
42 WGZ 030C through 200C IMM WGZC
Table 33, Wire Sizing, Multi-point Power
WGZ
Unit
Size
030
035
040
045
050
055
060
070
080
090
100
115
Volts
208 67 67 51 51 3 #4 #4 3 #6 #6
230 67 67 45 45 3 #4 #4 3 #8 #8
460 33 33 27 27 3 #10 #10 3 #10 #10
575 28 28 N/A N/A 3 #10 #10 3 -- --
208 68 68 57 57 3 #4 #4 3 #6 #6
230 68 68 53 53 3 #4 #4 3 #6 #6
460 38 38 27 27 3 #8 #8 3 #10 #10
575 28 28 N/A N/A 3 #10 #10 3 -- --
208 75 75 65 65 3 #4 #4 3 #6 #6
230 75 75 58 58 3 #4 #4 3 #6 #6
460 41 41 29 29 3 #8 #8 3 #10 #10
575 29 29 N/A N/A 3 #10 #10 3 -- --
208 109 109 69 69 3 #2 #2 3 #4 #4
230 109 109 63 63 3 #2 #2 3 #6 #6
460 42 42 33 33 3 #8 #8 3 #10 #10
575 33 33 27 27 3 #10 #10 3 #10 #10
208 116 116 81 81 3 #1 #1 3 #4 #4
230 116 116 74 74 3 #1 #1 3 #4 #4
460 52 52 38 38 3 #6 #6 3 #8 #8
575 45 45 31 31 3 #8 #8 3 #10 #10
208 116 126 81 99 3 #1 #1 3 #4 #3
230 116 126 74 90 3 #1 #1 3 #4 #3
460 52 61 38 45 3 #6 #6 3 #8 #8
575 45 54 31 36 3 #8 #6 3 #10 #8
208 126 126 99 99 3 #1 #1 3 #3 #3
230 126 126 90 90 3 #1 #1 3 #3 #3
460 61 61 45 45 3 #6 #6 3 #8 #8
575 54 54 36 36 3 #6 #6 3 #8 #8
208 149 149 112 112 3 1/0 1/0 3 #2 #2
230 149 149 102 102 3 1/0 1/0 3 #2 #2
460 65 65 51 51 3 #6 #6 3 #6 #6
575 55 55 41 41 3 #6 #6 3 #8 #8
208 167 167 123 123 3 2/0 2/0 3 #1 #1
230 167 167 112 112 3 2/0 2/0 3 #2 #2
460 69 69 56 56 3 #4 #4 3 #6 #6
575 56 56 45 45 3 #6 #6 3 #8 #8
208 167 201 123 146 3 2/0 4/0 3 #1 1/0
230 167 201 112 132 3 2/0 4/0 3 #2 1/0
460 69 95 56 67 3 #4 #3 3 #6 #4
575 56 73 45 53 3 #6 #4 3 #8 #6
208 201 201 146 146 3 4/0 4/0 3 1/0 1/0
230 201 201 132 132 3 4/0 4/0 3 1/0 1/0
460 95 95 67 67 3 #3 #3 3 #4 #4
575 73 73 53 53 3 #4 #4 3 #6 #6
208 227 227 173 173 3 4/0 4/0 3 2/0 2/0
230 227 227 156 156 3 4/0 4/0 3 2/0 2/0
460 111 111 79 79 3 #2 #2 3 #4 #4
575 94 94 63 63 3 #3 #3 3 #6 #6
Minimum Circuit Ampacity (MCA)
Without Ext OL's With External OL's Wire Gauge, 75C Wire Gauge,75C
Circuit
No.1
Circuit
No.2
Circuit
No.1
Circuit
No.2
Continued next page.
Power Supply
Without External OL's
Field
Wire
Quantity
Circuit
No.1
Circuit
No.2
Power Supply
With External OL's
Field
Wire
Quantity
Circuit
No.1
Circuit
No.2
IMM WGZC WGZ 030C through 200C 43
Table 34, Wire Sizing, Multi-point Power, Continued
WGZ
Volts
Unit
Size
208 247 247 195 195 3 250 250 3 3/0 3/0
230 247 247 176 176 3 250 250 3 3/0 3/0
130
460 123 123 88 88 3 #1 #1 3 #3 #3
575 112 112 71 71 3 #2 #2 3 #4 #4
208 290 290 211 211 3 350 350 3 4/0 4/0
230 290 290 190 190 3 350 350 3 3/0 3/0
150
460 137 137 97 97 3 1/0 1/0 3 #3 #3
575 105 105 76 76 3 #2 #2 3 #4 #4
208 290 357 211 281 3 350 500 3 4/0 300
230 290 357 190 254 3 350 500 3 3/0 250
170
460 137 178 97 127 3 1/0 3/0 3 #3 #1
575 105 161 76 102 3 #2 2/0 3 #4 #2
208 357 357 281 281 3 500 500 3 300 300
230 357 357 254 254 3 500 500 3 250 250
200
460 178 178 127 127 3 3/0 3/0 3 #1 #1
575 161 161 102 102 3 2/0 2/0 3 #2 #2
NOTES
1. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of the other compressor RLA's...
2. Multiple Point power supply requires a separate fused disconnect for each circuit to supply electrical power to the unit.
3. External Compressor Overload option is only available with packaged units with water-cooled condenser....
Minimum Circuit Ampacity (MCA)
Without Ext OL's With External OL's
Circuit
No.1
Circuit
No.2
Circuit
No.1
Circuit
No.2
Quantity
Power Supply
Without External OL's
Field
Wire
Wire Gauge, 75C Wire Gauge,75 C
Circuit
No.1
Circuit
No.2
Power Supply
With External OL's
Field
Wire
Quantity
Circuit
No.1
Circuit
No.2
44 WGZ 030C through 200C IMM WGZC
Table 35, Single Point Connection Sizing, Without External Overloads
Factory-Installed HSCCR
Disconnect Switch
(Circuit Breaker)
Switch
Size [2]
Connection [3] Wire
Range - CU
Factory-Installed, Molded
Case Disconnect Switch
Switch
Size [2]
WGZ
Unit
Size
030
035
040
045
050
055
060
070
080
090
100
115
130
Factory-Installed
Power Block
Volts
Power Block or Bus
Bar Lugs
Size [2]
208 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
230 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
460 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
230 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
460 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
230 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
460 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
230 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
460 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
230 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
460 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
230 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
460 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
230 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
460 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
575 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
208 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
230 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
460 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
575 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
208 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
230 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
460 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
575 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
208 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
230 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
460 175 (1) 2/0 - #14 400 (2) 500- 3/0 250 (1) 350 - #4
575 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
208 380 (1) 500 - #4 800 (4) 500- 250 600 (2) 500- 3/0
230 380 (1) 500 - #4 800 (4) 500- 250 600 (2) 500- 3/0
460 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
575 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
208 760 (2) 500 - #4 800 (2) 500- #1 (Note #1) 600 (2) 500- 3/0
230 760 (2) 500 - #4 800 (2) 500- #1 (Note #1) 600 (2) 500- 3/0
460 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
575 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
208 760 (2) 500 - #4 800 (4) 500- 250 600 (2) 500- 3/0
230 760 (2) 500 - #4 800 (4) 500- 250 600 (2) 500- 3/0
460 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
575 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
Connection
Wire Range –
CU [3]
Continued next page.
Connection [3]
Wire Range - CU
IMM WGZC WGZ 030C through 200C 45
Single Point Connection Sizing, Without External Overloads, Continued
Factory-Installed
WGZ
Unit
Size
150
170
200
NOTES:
Volts
Power Block or Bus
See Note below
208 760 (2) 500 - #4 n/a -- 800 (4) 500- 250
230 760 (2) 500 - #4 n/a -- 800 (4) 500- 250
460 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
575 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
208 760 (2) 500 - #4 n/a -- 800 (4) 500- 250
230 760 (2) 500 - #4 n/a -- 800 (4) 500- 250
460 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
575 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
208 760 (2) 500 - #4 n/a -- 800 (4) 500- 250
230 760 (2) 500 - #4 n/a -- 800 (4) 500- 250
460 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
575 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
Power Block
Bar Lugs
Size [2]
Connection
Wire Range –
CU [3]
1. The disconnect has special lugs
2. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of the other
compressor RLA's.
3. Single Point power supply requires a single fused disconnect to supply electrical electrical power to the unit
4. External Compressor Overload Option is only available with Packaged Units with Water Cooled Condenser.
5. “Size" is the maximum amperage rating for the terminals or the main electrical device.
6. "Connection" is the range of wire sizes that the terminals on the electrical device will accept.
Factory-Installed HSCCR
Disconnect Switch
Circuit Breaker
Switch
Size [2]
Connection [3]
Wire Range - CU
Factory-Installed Disconnect
Switch Molded Case
Switch
Size [2]
Connection [3]
Wire Range - CU
Table 36, Single Point Connection Sizing, With External Overloads-
Factory Installed HSCCR
Disconnect Switch Circuit
Switch
Size [2,5]
Breaker
Connection
Wire Range
CU [6]
WGZ
Unit
Size
030
035
040
045
050
Volts
208 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
230 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
460 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
575 n/a - n/a - n/a -
208 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
230 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
460 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
575 n/a - n/a - n/a -
208 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
230 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
460 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
575 n/a - n/a - n/a -
208 380 (1) 500 - #4 250 (2) 500- #1 250 (1) 350 - #4
230 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
460 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 380 (1) 500 - #4 400 (2) 500- #4 (Note #1) 250 (1) 350 - #4
230 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
460 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
Power Block or
Continued next page.
Factory Installed
Power Block
Bus Bar Lugs
Size [2,5])
Connection
Wire Range CU
[6]
Factory Installed
Disconnect Switch Molded
Switch
Size [2,5]
Case
Connection
Wire Range – CU
[6]
46 WGZ 030C through 200C IMM WGZC
Factory Installed HSCCR
Disconnect Switch
(Circuit Breaker)
Switch
Size [2,5]
Connection
Wire Range
CU [6]
Factory Installed, Molded
Case Disconnect Switch
Switch
Size [2,5]
Connection
Wire Range
CU [6]
WGZ
Unit
Size
055
060
070
080
090
100
115
130
150
170
200
NOTES:
Factory Installed
Power Block
Volts
208 380 (1) 500 - #4 400 (2) 500- #4 (Note #1) 250 (1) 350 - #4
230 380 (1) 500 - #4 400 (2) 500- #4 (Note #1) 250 (1) 350 - #4
460 175 (1) 2/0 - #14 250 (1) 350 - #4 100 (1) 1/0 - #10
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
230 380 (1) 500 - #4 400 (2) 500- #4 (Note #1) 250 (1) 350 - #4
460 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
230 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
460 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
230 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
460 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
575 175 (1) 2/0 - #14 150 (1) 350 - #4 100 (1) 1/0 - #10
208 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
230 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
460 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
575 175 (1) 2/0 - #14 250 (1) 350 - #4 100 (1) 1/0 - #10
208 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
230 380 (1) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
460 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
575 175 (1) 2/0 - #14 250 (1) 350 - #4 125 (1) 3/0- #3
208 760 (2) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
230 760 (2) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
460 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
575 380 (1) 500 - #4 250 (1) 350 - #4 125 (1) 3/0- #3
208 760 (2) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
230 760 (2) 500 - #4 600 (2) 500- 3/0 400 (2) 500- 3/0
460 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
575 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
208 760 (2) 500 - #4 800 (2) 500- #1 (Note #1) 600 (2) 500- 3/0
230 760 (2) 500 - #4 800 (4) 500- 250 600 (2) 500- 3/0
460 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
575 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
208 760 (2) 500 - #4 800 (4) 500- 250 600 (2) 500- 3/0
230 760 (2) 500 - #4 800 (2) 500- #1 (Note #1) 600 (2) 500- 3/0
460 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
575 380 (1) 500 - #4 400 (2) 500- #4 (Note #1) 250 (1) 350 - #4
208 760 (2) 500 - #4 n/a -- 600 (2) 500- 3/0
230 760 (2) 500 - #4 800 (4) 500- 250 600 (2) 500- 3/0
460 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
575 380 (1) 500 - #4 400 (2) 500- 3/0 250 (1) 350 - #4
Power Block or
Bus Bar Lugs
Size [2,5])
Connection
Wire Range CU
[6]
1. The disconnect has special lugs.
2. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of the other
compressor RLA's.
3. Single Point power supply requires a single fused disconnect to supply electrical power to the unit
4. External Compressor Overload Option is only available with Packaged Units with Water Cooled
Condenser.
5. “Size" is the maximum amperage rating for the terminals or the main electrical device.
6. "Connection" is the range of wire sizes that the terminals on the electrical device will accept.
IMM WGZC WGZ 030C through 200C 47
Figure 16, Multi- Point Connection Sizing, Without External Overloads
Power Terminal Block Factory Installed Disconnect
WGZ
Unit
Volts
Size
Size (1)
208 175 #14 - 2/0 175 #14 - 2/0
230 175 #14 - 2/0 175 #14 - 2/0
030
460 175 #14 - 2/0 175 #14 - 2/0
575 175 #14 - 2/0 175 #14 - 2/0
208 175 #14 - 2/0 175 #14 - 2/0
230 175 #14 - 2/0 175 #14 - 2/0
035
460 175 #14 - 2/0 175 #14 - 2/0
575 175 #14 - 2/0 175 #14 - 2/0
208 175 #14 - 2/0 175 #14 - 2/0
230 175 #14 - 2/0 175 #14 - 2/0
040
460 175 #14 - 2/0 175 #14 - 2/0
575 175 #14 - 2/0 175 #14 - 2/0
208 175 #14 - 2/0 175 #14 - 2/0
230 175 #14 - 2/0 175 #14 - 2/0
045
460 175 #14 - 2/0 175 #14 - 2/0
575 175 #14 - 2/0 175 #14 - 2/0
208 175 #14 - 2/0 175 #14 - 2/0
230 175 #14 - 2/0 175 #14 - 2/0
050
460 175 #14 - 2/0 175 #14 - 2/0
575 175 #14 - 2/0 175 #14 - 2/0
208 175 #14 - 2/0 175 #14 - 2/0
230 175 #14 - 2/0 175 #14 - 2/0
055
460 175 #14 - 2/0 175 #14 - 2/0
575 175 #14 - 2/0 175 #14 - 2/0
208 175 #14 - 2/0 175 #14 - 2/0
230 175 #14 - 2/0 175 #14 - 2/0
060
460 175 #14 - 2/0 175 #14 - 2/0
575 175 #14 - 2/0 175 #14 - 2/0
208 175 #14 - 2/0 175 #14 - 2/0
230 175 #14 - 2/0 175 #14 - 2/0
070
460 175 #14 - 2/0 175 #14 - 2/0
575 175 #14 - 2/0 175 #14 - 2/0
208
230
080
460
575
208
230
090
460
575
-Circuit #1 Circuit #2 Circuit #1 Circuit #2
Power Block or
Bus Bar Lugs
Connection (2)
Wire Range
175 (1) 2/0 - #14 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
Power Block or
Bus Bar Lugs
Size (1)
Connection (2)
Wire Range
Molded Case Molded Case
Switch
Size (1)
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
125 (1) 3/0- #3 125 (1) 3/0- #3
125 (1) 3/0- #3 125 (1) 3/0- #3
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
125 (1) 3/0- #3 125 (1) 3/0- #3
125 (1) 3/0- #3 125 (1) 3/0- #3
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
125 (1) 3/0- #3 250 (1) 350 - #4
125 (1) 3/0- #3 250 (1) 350 - #4
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
250 (1) 350 - #4 250 (1) 350 - #4
250 (1) 350 - #4 250 (1) 350 - #4
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
250 (1) 350 - #4 250 (1) 350 - #4
250 (1) 350 - #4 250 (1) 350 - #4
100 (1) 1/0 - #10 100 (1) 1/0 - #10
100 (1) 1/0 - #10 100 (1) 1/0 - #10
Connection (2)
Wire Range -
Copper
Continued next page.
Switch
Size (1)
Connection (2)
Wire Range -
Copper
48 WGZ 030C through 200C IMM WGZC
Figure 17, Multi- Point Connection Sizing, Without External Overloads, Continued
Power Terminal Block Factory Installed Disconnect
WGZ
Unit
Volts
Size
Size (1)
208
230
100
460
575
208
230
115
460
575
208
230
130
460
575
208
230
150
460
575
208
230
170
460
575
208
230
200
460
575
NOTES:
1. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of the other compressor RLA's.
2. Multiple-Point power supply requires a separate fused disconnect for each circuit to supply electrical power to the unit
3 . External Compressor Overload Option is only available with packaged units with water cooled condenser. -
5. "Size" is the maximum amperage rating for the terminals or the main electrical device.
6. "Connection" is the range of wire sizes that the terminals on the electrical device will accept.
-Circuit #1 Circuit #2 Circuit #1 Circuit #2
Power Block or
Bus Bar Lugs
Connection (2)
Wire Range
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 125 (1) 3/0- #3
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
380 (1) 500 - #4 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
380 (1) 500 - #4 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
175 (1) 2/0 - #14 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 125 (1) 3/0- #3
380 (1) 500 - #4 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
380 (1) 500 - #4 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
175 (1) 2/0 - #14 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 125 (1) 3/0- #3
380 (1) 500 - #4 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
380 (1) 500 - #4 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
175 (1) 2/0 - #14 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 250 (1) 350 - #4
380 (1) 500 - #4 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
380 (1) 500 - #4 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
Power Block or
Bus Bar Lugs
Size (1)
Connection (2)
Wire Range
Molded Case Molded Case
Switch
Size (1)
Connection (2)
Wire Range -
Copper
Switch
Size (1)
Connection (2)
Wire Range -
Copper
IMM WGZC WGZ 030C through 200C 49
Table 37, Multi- Point Connection Sizing, With External Overloads
NOTE: (x) indicates note number.
Power Terminal Block Factory Installed Disconnect Switch
WGZ
Unit
Size
030
035
040
045
050
055
060
070
080
090
Volts
208
230
460
575
208
230
460
575
208
230
460
575
208
230
460
575
208
230
460
575
208
230
460
575
208
230
460
575
208
230
460
575
208
230
460
575
208
230
460
575
Power Block
-Circuit #1 -Circuit #2 Circuit.#1 Circuit.#2
or Bus Bar
Lug Size (1)
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
n/a - n/a - n/a - n/a -
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
n/a - n/a - n/a - n/a -
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
n/a - n/a - n/a - n/a -
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 125 (1) 3/0- #3
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 125 (1) 3/0- #3
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 125 (1) 3/0- #3
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 125 (1) 3/0- #3
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 125 (1) 3/0- #3
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
Connection
(2)
Wire Range
Power Block
or Bus Bar
Lugs Size (1)
Connection
(2)
Wire Range
Switch
Size (1)
Molded Case Molded Case
Wire Range - Copper
Continued next page.
Connection (2)
Switch
Size (1)
Connection (2)
Wire Range - Copper
50 WGZ 030C through 200C IMM WGZC
Table 38, Multi- Point Connection Sizing, With External Overloads, Continued
Power Terminal Block Factory Installed Disconnect Switch
WGZ
Unit
Volts
Size
208
230
100
460
575
208
230
115
460
575
208
230
130
460
575
208
230
150
460
575
208
230
170
460
575
208
230
200
460
575
NOTES:
1. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of the other compressor RLA's.
2. Multiple Point power supply requires a separate fused disconnect for each circuit to supply electrical power to the unit
3. External Compressor Overload Option is only available with Packaged Units with Water Cooled Condenser.
-Circuit #1 -Circuit #2 Circuit.#1 Circuit.#2
Power
Block or
Bus Bar
Lugs
Size (1)
380 (1) 500 - #4 380 (4) (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
380 (1) 500 - #4 380 (4) (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 125 (1) 3/0- #3
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 100 (1) 1/0 - #10
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 400 (2) 500- 3/0
380 (1) 500 - #4 380 (1) 500 - #4 250 (1) 350 - #4 400 (2) 500- 3/0
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 100 (1) 1/0 - #10 125 (1) 3/0- #3
380 (1) 500 - #4 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
380 (1) 500 - #4 380 (1) 500 - #4 400 (2) 500- 3/0 400 (2) 500- 3/0
380 (1) 500 - #4 380 (4) (1) 500 - #4 250 (1) 350 - #4 250 (1) 350 - #4
175 (1) 2/0 - #14 175 (1) 2/0 - #14 125 (1) 3/0- #3 125 (1) 3/0- #3
Connection
(2)
Wire Range
Power Block or
Bus Bar Lugs
Size (1)
Connection
(2)
Wire Range
Molded Case Molded Case
Switch
Size (1)
Connection (2)
Wire Range -
Copper
Switch
Size (1)
Connection (2)
Wire Range -
Copper
IMM WGZC WGZ 030C through 200C 51
Notes for “Electrical Data Single Point” Power:
1. If a separate 115V power supply is used for the control circuit, then the wire sizing amps is 10 amps
for all unit sizes.
2. Recommended power lead wire sizes for 3 conductors per conduit are based on 100% conductor
ampacity in accordance with NEC. Vo ltage drop has not been included. Therefore, it is recommended
that power leads be kept short. All terminal block connections must be made with copper wire.
3. The recommended power lead wire sizes are based on an ambient temperature of 86°F (30°C).
Ampacity correction factors must be applied for other ambient temperatures. Refer to the National
Electrical Code Handbook.
4. Must be electrically grounded according to national and local electrical codes.
Voltage Limitations:
1. Within 10 percent of nameplate rating
2. Voltage unbalance not to exceed 2% with a resultant current unbalance of 6 to 10 times the voltage
unbalance per NEMA MG-1, 1998 Standard. This is an important restriction that must be adhered to.
Notes for “Field Wiring Data”
1. Requires a single disconnect to supply electrical power to the unit. This power supply must either be
fused or use a circuit breaker.
2. All field wiring to unit power block or optional non-fused disconnect switch must be copper.
3. All field wire size values given in table apply to 75°C rated wire per NEC.
Supplemental Overloads Option
Supplemental overloads option is used to reduce the required electrical service size and wire sizing to the
water cooled version of WGZ chillers. The overloads reduce the electrical ratings for the compressor
because water-cooled duty is less severe than air cooled duty. The overload option is only available for
models with water-cooled condensers (not WGZ-CA models with air-cooled condensers).
Standard Panel Ratings (kA)
Voltage
208-230
460
575
WGZ 030-035 WGZ 040-090 WGZ 100-200
5 10 10
5 5 10
5 5 10
WGZ-C Model Size
Optional Panel Ratings (kA)
Voltage
208-230
460
575
NOTE High Short Circuit Current Rating (HSCCR) provides all panel components rated per above table
and is so labeled. High Interrupt Disconnect Switch provides for only a disconnect switch with the rating,
and the panel has no special labeling.
Options, Single-Point Power Connection Only
High Short Circuit Current
Rating
100 100
65 65
25 25
High Interrupt
Disconnect Switch
52 WGZ 030C through 200C IMM WGZC
Field Wiring Diagram
A
A
A
Figure 18, WGZ 030CW – 200CW Field Wiring Diagram
3 PHASE
POWER
SUPPLY
NOTE: ALL FIELD WIRING TO BE
INSTALLED AS NEC CLASS 1
WIRING SYSTEM WITH CONDUCTOR
RATED 600 VOLTS
FIELD
SUPPLIED
OPTION
120VAC
CONTROL POWER
BELL
FACTORY SUPPLIED ALARM
FIELD WIRED
ALARM BELL RELAY
TIME
CLOCK
AUTO
ON
MANUAL
UTO
ON
MANUAL
NOR. OPEN PUMP AUX. CONTACTS (OPTIONAL)
NOR. OPEN PUMP AUX. CONTACTS (OPTIONAL)
4-20MA FOR
EVAP. WATER RESET
(BY OTHERS)
4-20MA FOR
DEMAND LIMIT
(BY OTHERS)
LESS
EVAPORATOR
ONLY
REMOTE STOP
SWITCH
(BY OTHERS)
ICE MODE SWITCH
(BY OTHERS)
CHW FLOW SWITCH
---MANDATORY–(BY OTHERS)
CDW FLOW SWITCH
---MANDATORY–(BY OTHERS)
ALARM
OPTION
DISCONNECT
(BY OTHERS)
N
CHW PUMP RELAY (BY OTHERS)
TOWER FAN #1 COIL (BY OTHERS)
TOWER FAN #2 COIL (BY OTHERS)
OFF
OFF
UNIT MAIN
TERMINAL BLOCK
FUSED CONTROL
CIRCUIT TRANSFORMER
OPTION
DISCONNECT
(BY OTHERS)
(BY OTHERS)
120 VAC 1.0 AMP MAX
CDW PUMP RELAY (BY OTHERS)
120 VAC 1.0 AMP MAX
120 VAC 1.0 AMP MAX
120 VAC 1.0 AMP MAX
+
-
+
-
COOLING TOWER BYPASS
(BY OTHERS)
COOLING TOWER BYPASS
(BY OTHERS)
LIQUID LINE #1 SOLENOID
24 VAC 1.5 AMP MAX.
LIQUID LINE #2 SOLENOID
24 VAC 1.5 AMP MAX.
HOT GAS BYPASS #1 SOLENOID
24 VAC 1.0 AMP MAX.
HOT GAS BYPASS #2 SOLENOID
24 VAC 1.0 AMP MAX.
10A
FUSE
GND LUG
120 VAC
TB1
CONTROLLER
J15-NO8
TB3-90
TB1-12
J16-NO9
TB3-91
TB1-12
J16-NO10
TB3-92
TB2
TB3
TO COMPRESSOR(S)
AND FAN MOTORS
TB1-20
1
2
11
14
CONTROL
CIRCUIT
FUSE
N
120 VAC
120 VAC
N
120 VAC
N
120 VAC
10
15
40
53
42
60
43
55
33
44
41
54
49
50
51
52
78
77
80
79
62
65
63
65
67
70
68
70
120 VAC
GND
IF REMOTE STOP
897
CONTROL IS USED,
REMOVE LEAD 897
FROM TERM. 40 TO 53.
GND
N
N
24 VAC
N
24 VAC
N
24 VAC
N
24 VAC
N
0-10 VDC
0-10 VDC
LARM BELL
RELAY
COM NO
BELL
12
LARM BELL OPTION
FIELD WIRING FOR WGZ030-200C
PACKAGE/ WITH CONDENSER
WITH MICROTECH CONTROLLER
DWG. 330538901 REV.0D
IMM WGZC WGZ 030C through 200C 53
Figure 19, WGZ 030CA – 200CA Field Wiring Diagram (Remote Condenser)
SCO
A
A
DI
3 PHASE
POWER
SUPPLY
NOTE: ALL FIELD WIRING TO BE
INSTALLED AS NEC CLASS 1
WIRING SYSTEM WITH CONDUCTOR
RATED 600 VOLTS
FIELD
SUPPLIED
OPTION
120VAC
CONTROL POWER
FACTORY SUPPLIED ALARM
TIME
CLOCK
FIELD WIRED
ALARM BELL RELAY
AUTO
ON
MANUAL
AUTO
ON
MANUAL
DEMAND LIMIT
REMOTE STOP
SWITCH
(BY OTHERS)
ICE MODE
SWITCH
(BY OTHERS)
CHW FLOW SWITCH
---MANDATORY–-
(BY OTHERS)
ALARM BELL
OPTION
NOTE: CONDENSER
FAN MOTORS CAN ALSO
BE CONTROLLED BY
PRESSURE SWITCHES
ON THE CONDENSER.
FIELD WIRING FOR WGZ030-200C
(REMOTE CONDENSER)
WITH MICROTECH CONTROLLER
DWG. 330539001 REV.0D
NNECT
(BY OTHERS)
DISCONNECT
(BY OTHERS)
N
OFF
OFF
NOR. OPEN PUMP AUX.
CONTACTS (OPTIONAL)
4-20MA FOR
CHW RESET
(BY OTHERS)
4-20MA FOR
(BY OTHERS)
COOLING TOWER BYPASS
COOLING TOWER BYPASS
UNIT MAIN
TERMINAL BLOCK
FUSED CONTROL
CIRCUIT
TRANSFORMER
OPTION
10A
FUSE
(BY OTHERS)
CHW PUMP RELAY
(BY OTHERS)
120 VAC 1.0 AMP MAX
+
-
+
-
(BY OTHERS)
(BY OTHERS)
FAN MOTOR #1 COIL (BY OTHERS)
120 VAC 1.0 AMP MAX.
FAN MOTOR #2 COIL (BY OTHERS)
120 VAC 1.0 AMP MAX.
FAN MOTOR #3 COIL (BY OTHERS)
120 VAC 1.0 AMP MAX.
FAN MOTOR #4 COIL (BY OTHERS)
120 VAC 1.0 AMP MAX.
FAN MOTOR #5 COIL (BY OTHERS)
120 VAC 1.0 AMP MAX.
FAN MOTOR #6 COIL (BY OTHERS)
120 VAC 1.0 AMP MAX.
FAN MOTOR #7 COIL (BY OTHERS)
120 VAC 1.0 AMP MAX.
FAN MOTOR #8 COIL (BY OTHERS)
120 VAC 1.0 AMP MAX.
GND LUG
120 VAC
TB1
11
14
10
15
TB2
52
TB3
78
77
80
79
CONTROLLER
J15-NO8
TB3-90
TB1-12
J16-NO9
TB3-91
J16-NO10
TB3-92
J16-NO11
TB3-93
J18-NO13
TB3-94
J22-NO16
TB3-95
J22-NO17
TB3-96
J22-NO18
TB3-97
TO COMPRESSOR(S)
AND FAN MOTORS
TB1-20
1
2
CONTROL
CIRCUIT
FUSE
N
120 VAC
120 VAC
GND
IF REMOTE STOP
40
53
42
60
43
55
33
44
37
49
50
38
51
CONTROL IS USED,
897
REMOVE LEAD 897
FROM TERM. 40 TO 53.
GND
GND
N
0-10 VDC
0-10 VDC
N
120 VAC
N
120 VAC
120 VAC
120 VAC
120 VAC
120 VAC
120 VAC
120 VAC
COM NO
BELL
12
LARM BELL OPTION
LARM BELL
RELAY
54 WGZ 030C through 200C IMM WGZC
Control Panel Layout
Table 39, Typical Control Panel, 4-Compressor Unit w/ Optional Disconnect Switch
Microtech
Controller
(2) Circuit
Mechanical
Hi-Pressure
Switch Relays
(3) 120V/24V
Transformers
LineV/120V
Control
Transformer
Switches
7/8-in. KO for
control wiring
(4) Compressor
Circuit Breakers
(4) Compressor
Contactors
Location for
Optional External
Overloads
1. Additional space provided in the upper right section for extra components required for optional
multiple point power connection.
Control
Transformer
Fuses, Primary
Control
Transformer
Fuse, Secondary
Optional
Disconnect Switch
KO for Power
Wiring
Grounding
Lug
2. Front door has opening on top for access to the MicroTech II controller for viewing display and
making keypad entries without opening the panel door.
Motor Protection Module
The motor protection system consists of an external control module, located on each compressor,
connected to a series of thermistors located in the motor windings and the compressor discharge port. If
the windings experience an over-temperature condition or the discharge temperature is excessive, the
module will trip and shut off the compressor for a 30-minute time delay.
IMM WGZC WGZ 030C through 200C 55
Start-Up and Shutdown
Complete operating instructions are contained in Operating Manual OM WGZC-Current.
Pre Start-up
1. The chilled-water system should be flushed and cleaned. Proper water treatment is required to prevent
corrosion and organic growth.
2. With main disconnect open, check all electrical connections in control panel and starter to be sure
they are tight and provide good electrical contact. Although connections are tightened at the factory,
they can loosen enough in shipment to cause a malfunction.
3. Check and inspect all water piping. Make sure flow direction is correct and piping is made to correct
connection on evaporator and condenser.
4. Open all water flow valves to the condenser and evaporator.
5. Flush the cooling tower and system piping to be sure the system is clean. Start evaporator pump and
manually start condenser pump and cooling tower. Check all piping for leaks. Vent the air from the
evaporator and condenser water circuit, as well as from the entire water system. The cooler circuit
should contain clean, treated, non-corrosive water.
6. Check to see that the evaporator water thermostat sensor is securely installed.
7. Making sure control stop switch S1 is open (off) and pumpdown switches PS1 and PS2 are on
“manual pumpdown,” place the main power and control disconnect switches to “on.” This will
energize the crankcase heaters. Wait a minimum of 12 hours before starting the unit.
8. Check compressor oil level. Prior to start-up, the oil level should cover at least one-third of the oil
sight glass located in the equalizing line between the compressors or on the compressor.
9. Check water pressure drop across evaporator and condenser, and see that water flow is correct
(beginning on page
10. Check the actual line voltage to the unit to make sure it is the same as called for on the compressor
nameplate, within + 10%, and that phase voltage unbalance does not exceed 3%. Verify that adequate
power supply and capacity is available to handle load.
11. Make sure all wiring and fuses are of the proper size. Also make sure that all interlock wiring is
completed per McQuay diagrams.
12. Verify that all mechanical and electrical inspections by code authorities have been completed.
13. Make sure all auxiliary load and control equipment is operative and that an adequate cooling load is
available for initial start-up.
75H15) per the design flow rates.
Start-up
1. Open the compressor discharge shutoff valves until backseated. Always replace valve seal caps.
2. Open the two manual liquid line shutoff valves.
3. Check to see that the unit circuit breakers are in the “off” position.
4. Check to see that the pumpdown switches, PS1 and PS2, are in the “manual pumpdown” position and
the control system switch S1 is in the “off” position.
5. Put the main power and control circuit disconnects to the “on” position.
6. Verify crankcase heaters have operated for at least 12 hours prior to start-up. Crankcase should be
warm to the touch.
7. Check that the MicroTech II controller is set to the desired chilled water temperature.
8. Start the system auxiliary equipment for the installation by turning on the time clock, ambient
thermostat and/or remote on/off switch and water pumps.
9. Check resets of all equipment protection controls.
56 WGZ 030C through 200C IMM WGZC
10. Switch on the unit circuit breakers.
11. Set pumpdown switches PS1 and PS2 to “auto” for restart and normal operation.
12. Start the system by setting the system switch S1 to on.
13. After running the unit for a short time, check the oil level in each compressor crankcase, rotation of
condenser fans (if any), and check for flashing in the refrigerant sight glass.
14. After system performance has stabilized, it is necessary that the “Compressorized Equipment
Warranty Form” (Form No. 206036A) be completed to establish commencement of the warranty
period. Be sure to list the pressure drop across both vessels. This form is shipped with the unit and
after completion should be returned to the McQuayService Department through your sales
representative.
Weekend or Temporary Shutdown
Move pumpdown switches PS1 and PS2 to the “manual pumpdown” position. After the compressors have
pumped down, turn off the chilled water pump. Note: With the unit in this condition, it will not restart
until these switches are turned back on. The unit has one-time pumpdown. It is important that the
compressors pump down before the water flow to the unit is interrupted to avoid freeze-up in the
evaporator.
Leave S1 on and power to the unit so that the crankcase heaters will remain energized.
Start-up after Temporary Shutdown
1. Start the water pumps.
2. With the control system switch S1 in the “on” position, move the pumpdown switches PS1 and PS2
to the “auto pumpdown” position.
3. Observe the unit operation for a short time, noting unusual sounds or possible cycling of compressors.
4. Check compressor crankcase heaters.
Extended Shutdown
1. Close the manual liquid line shutoff valves.
2. After the compressors have pumped down, turn off the water pumps.
3. Turn off all power to the unit.
4. Move the control service switch S1 to the “off” position.
5. Close the discharge shutoff valves on the compressor(s) and the liquid outlet valves at the condenser.
6. Tag all opened disconnect switches to warn against start-up before opening the compressor suction
and discharge valves.
7. Drain all water from the unit evaporator, condenser, and chilled water piping if the unit is to be shut
down during the winter and exposed to below freezing temperatures. Do not leave the vessels or
piping open to the atmosphere over the shutdown period.
IMM WGZC WGZ 030C through 200C 57
Start-up after Extended Shutdown
1. Inspect all equipment to see that it is in satisfactory operating condition.
2. Remove all debris that has collected on the surface of the condenser coils (remote condenser models)
or check the cooling tower, if present.
3. Open the compressor discharge valves until backseated. Always replace valve seal caps.
4. Open the manual liquid line shutoff valves.
5. Check circuit breakers. They must be in the “off” position.
6. Check to see that the pumpdown switches PS1 and PS2 are in the “manual shutdown” position and
the control system switch S1 is in the “off” position.
7. Put the main power and control circuit disconnects to the “on” position.
8. Allow the crankcase heaters to operate for at least 12 hours prior to start-up.
9. Start the chilled water pump and purge the water piping as well as the evaporator in the unit.
10. Start the system auxiliary equipment for the installation by turning on the time clock, ambient
thermostat and/or remote on/off switch.
11. Check that the MicroTech II controller is set to the desired chilled water temperature.
12. Check resets of all equipment protection controls.
13. Switch the unit circuit breakers to “on.”
14. Start the system by setting the system switch S1 to “on.”
CAUTION
Most relays and terminals in the control center are powered when S1 is closed and the
control circuit disconnect is on. Therefore, do not close S1 until ready for start-up or
serious equipment damage can occur.
15. Set pumpdown switches PS1 and PS2 to the “auto pumpdown” position for restart and normal
operation.
16. After running the unit for a short time, check the oil level in the compressor oil sight glass or in the
compressor's equalizing lines for flashing indicating possible refrigerant in the oil (see Maintenance
section beginning on page
76H59).
58 WGZ 030C through 200C IMM WGZC
System Maintenance
General
To provide smooth operation at peak capacity and to avoid damage to package components, a program of
periodic inspections should be set up and followed. The following items are intended as a guide to be
used during inspection and must be combined with sound refrigeration and electrical practices to provide
trouble-free performance.
The liquid line sight glass/moisture indicator on all circuits must be checked to be sure that the glass is
full and clear and that the moisture indicator indicates a dry condition. If the indicator shows that a wet
condition exists or if bubbles show in the glass, even with a full refrigerant charge, the filter-drier element
must be changed.
Water supplies in some areas can tend to foul the water-cooled condenser to the point where cleaning is
necessary. The fouled condenser will be indicated by an abnormally high condenser approach temperature
(saturated discharge temperature minus leaving condenser water temperature) and can result in nuisance
trip-outs. To clean the condenser, mechanical cleaning or a chemical descaling solution should be used
according to the manufacturer’s directions.
Systems with remote air-cooled condensers require periodic cleaning of the finned surface of the
condenser coil.
Cleaning can be accomplished by using a cold water spray, brushing, vacuuming, or high-pressure air. No
tools should be used that could damage the coil tubes or fins.
The compressor oil level must be checked periodically to be sure that the level is at the center of the oil
sightglass located in the compressor's equalizing line or on the compressor itself. Low oil level can cause
inadequate lubrication and if oil must be added, use oils referred to in the following “Compressor
Lubrication” section.
A pressure tap has been provided on the liquid line downstream of the filter-drier and solenoid valve but
before the expansion valve. An accurate subcooled liquid pressure and temperature can be taken here. The
pressure read here could also provide an indication of excessive pressure drop through the filter-drier and
solenoid valve due to a clogging filter-drier. Note: A normal pressure drop through the solenoid valve is
approximately 3 psig (20.7 kPa) at full load conditions.
!
CAUTION
Warranty may be affected if wiring is not in accordance with specifications. A blow n fuse or
tripped protector indicates a short ground or overload. Before replacing fuse or restarting
compressor, the trouble must be found and corrected. It is important to have a qualified control
panel electrician service this panel. Unqualified tampering with the controls can cause serious
damage to equipment and void the warranty.
IMM WGZC WGZ 030C through 200C 59
!
DANGER
The panel is always energized to ground even when the system switch is off. To de-
energize the complete panel including crankcase heaters, pull the main unit disconnect.
Failure to do so can result in severe personal injury or death.
If motor or compressor damage is suspected, do not restart until qualified service personnel have checked
the unit.
Electrical Terminals
!
WARNING
To avoid injury from electric shock hazard, turn off all power and perform lockout and tag-
out of source before continuing with the following service. Note that the unit might be
powered from multiple sources.
All power electrical terminals should be re-tightened every six months, as they tend to loosen due to
normal heating and cooling of the wire.
Compressor Lubrication
The oil level should be watched carefully upon initial start-up and regularly thereafter.
All tandem and triple compressors on WGZ units come equipped with oil equalization lines connecting
the crankcase of each set of compressors in each refrigerant circuit. This allows the oil to move from one
compressor crankcase to the other during normal operation, and balance between the two when the
compressors are off. The oil sight glass is located in the equalization line on one circuit of the WGZ 070
and both circuits of WGZ 080 through WGZ 100. All other models have the oil sight glass in the
compressor body. In either case, the oil level should be 1/4 to 1/3 of the glass.
The units are factory-charged with lubricant and one of the following lubricants must be used if lubricant
is to be added to the system:
Copeland Ultra 22 CC
Mobil EAL Arctic 22 CC
ICI EMKARATE RL RL 32CF
Since POEs are very hygroscopic, they will quickly absorb moisture if exposed to air. Pump the lubricant
into the unit through a closed transfer system. Avoid overcharging the unit.
Oil can be added to the Copeland compressor through the oil fill hole in the crankcase. Special equipment is
required to add oil and the work should be done by qualified refrigeration technicians with the proper training
and equipment.
Sightglass and Moisture Indicator
The refrigerant sight glasses should be observed periodically. A monthly observation should be adequate. A
clear glass of liquid indicates that there is adequate refrigerant charge in the system to provide proper feed
through the expansion valve. The sight glass should be clear when:
Ambient temperature is above 75F (23C)
Both compressors on a circuit are running
All fans on a circuit are running
Bubbling refrigerant in the sight glass may occur at other conditions and may indicate that the system is short
of refrigerant charge. Refrigerant gas flashing in the sight glass could also indicate an excessive pressure drop
in the line, possibly due to a clogged filter-drier or a restriction elsewhere in the system. An element inside the
sight glass indicates what moisture condition corresponds to a given element color. If the sight glass does not
indicate a dry condition after about 12 hours of operation, the unit should be pumped down and the filterdriers changed.
60 WGZ 030C through 200C IMM WGZC
If the system is suspected of being short of refrigerant, a qualified service technician with EPA
certification should be contacted to thoroughly check out the unit and add refrigerant if
necessary.
Crankcase Heaters
The compressors are equipped with crankcase heaters. The function of the heater is to keep the
temperature in the crankcase high enough to prevent refrigerant from migrating to the
crankcase and condensing in the oil during off-cycle. When a system is to be started up
initially, the power to the heaters should be turned on for at least 12 hours before the
compressors are started. The crankcase should be up to about 80°F (26.7°C) before the system
is started up, to minimize lubrication problems or liquid slugging of compressor on start-up.
If the crankcase is cool (below 80°F) (26.7°C) and the oil level in the sight glass is full to top,
allow more time for oil to warm before starting the compressor.
The crankcase heaters are on whenever power is supplied to the unit and the compressor is not
running.
Optional Controls
Phase/Voltage Monitor (Optional)
The phase/voltage monitor is a device that provides protection against three-phase electrical
motor loss due to power failure conditions, phase loss, and phase reversal. Whenever any of
these conditions occur, an input relay is deactivated, disconnecting power to the thermostatic
control circuit. The compressor does a rapid shutdown pump down.
The input relay remains deactivated until power line conditions return to an acceptable level.
Trip and reset delays have been provided to prevent nuisance tripping due to rapid power
fluctuations.
When three-phase power has been applied, the input relay should close and the “run light”
should come on. If the relay does not close, perform the following tests.
1. Check the voltages between L1-L2, L1-L3, and L2-L3. These voltages should be
approximately equal and within +10% of the rated three-phase line-to-line voltage.
2. If these voltages are extremely low or widely unbalanced, check the power system to
determine the cause of the problem.
3. If the voltages are good, turn off the power and inter-change any two of the supply power
leads at the disconnect switch.
This may be necessary, as the phase/voltage monitor is sensitive to phase reversal. Turn on the
power. The relay should now close after the appropriate delay.
Factory settings are as follows:
Voltage Setting, set at nameplate voltage.
Trip Delay Time, 2 seconds
Restart Delay Time, 60 seconds
IMM WGZC WGZ 030C through 200C 61
Hot Gas Bypass (Optional)
This option allows passage of discharge gas to the evaporator, permitting operation at lower
loads than available with compressor unloading. It also keeps the velocity of refrigerant gas
high enough for proper oil return at light load conditions.
The pressure regulating valve is a Sporlan® SHGBE-8 and factory set to begin opening at 69
psig and can be changed by changing the pressure setting. The adjustment range is 0 to 100
psig. To raise the pressure setting, remove the cap on the bulb and turn the adjustment screw
clockwise. To lower the setting, turn the screw counterclockwise. Do not force the adjustment
beyond the range it is designed for, as this will damage the adjustment assembly. The
regulating valve opening point can be determined by slowly reducing the system load while
observing the suction pressure. When the bypass valve starts to open, the refrigerant line on the
evaporator side of the valve will begin to feel warm to the touch.
!
WARNING
The hot gas line can become hot enough to cause personal injury in a very short
time; care should be taken during valve checkout
62 WGZ 030C through 200C IMM WGZC
Maintenance Schedule
I. Compressor
A. Performance Evaluation (Log & Analysis) * O
B. Motor
Meg. Windings
Ampere Balance (within 10%)
Terminal Check (tight connections, porcelain clean)
Motor Cooling (check temperature)
C. Lubrication System
Oil Level
Oil Appearance (clear color, quantity)
Oil change if indicated by oil analysis
II. Controls
A. Operating Controls
Check Settings and Operation
B. Protective Controls
Test Operation of:
Alarm Relay X
Pump Interlocks X
High and Low Pressure Cutouts X
III. Condenser
B. Test Water Quality X
C. Clean Condenser Tubes (or as required) X
D. Eddycurrent Test - Tube Wall Thickness X
E. Seasonal Protection X
IV. Evaporator
B. Test Water Quality X
C. Clean Evaporator Tubes (or as required) X
D. Eddycurrent Test - Tube Wall thickness (or as required) X
E. Seasonal Protection X
V. Expansion Valves
A. Performance Evaluation (Superheat Control) X
VI. Compressor - Chiller Unit
A. Performance Evaluation O
B. Leak Test:
Compressor Fittings and Terminal
Piping Fittings
Vessel Relief Valves
C. Vibration Isolation Test X
D. General Appearance:
Paint
Insulation
VII. Starter(s)
A. Examine Contactors (hardware and operation) X
B. Verify Overload Setting and Trip X
C. Test Electrical Connections X
VIII. Optional Controls
A. Hot Gas Bypass (verify operation) X
X
X
X
X
O X
O
X
X
X
X
X
X
X
Key: O = Performed by in-house personnel X = Performed by service personnel
IMM WGZC WGZ 030C through 200C 63
System Service
Service on this equipment is to be performed only by qualified refrigeration personnel. Causes
for repeated tripping of equipment protection controls must be investigated and corrected.
Disconnect all power before doing any service inside the unit or serious personal injury or death
can occur.
NOTE: Anyone servicing this equipment must comply with the requirements set forth by the
EPA concerning refrigerant reclamation and venting.
Filter-Driers
To change the filter-drier, pump the unit down (with the compressor running) by closing the manual
liquid line shutoff valve(s). The unit will start pumping down until it reaches the low-pressure cutoff
setting of 58 psi.
Close the discharge valve. Remove the refrigerant in the liquid line with a recovery unit to EPA
required pressure. Remove and replace the filter-drier(s). Evacuate the lines through the liquid line
manual shutoff valve(s) to remove noncondensables that may have entered during filter replacement.
A leak check is recommended before returning the unit to operation.
!
DANGER
Liquid Line Solenoid Valve
The liquid line solenoid valve(s), which are responsible for automatic pumpdown during normal unit
operation, do not normally require any maintenance. However, in the event of failure they can require
replacement of the solenoid coil or of the entire valve assembly.
The solenoid coil can be removed from the valve body without opening the refrigerant piping by
moving pumpdown switch(es) PS1 and PS2 to the “manual” position.
The coil can then be removed from the valve body by simply removing a nut or snap-ring located at
the top of the coil. The coil can then be slipped off its mounting stud for replacement. Be sure to
replace the coil on its mounting stud before returning pumpdown switch(es) PS1 and PS2 to the “auto
pumpdown” position.
To replace the entire solenoid valve, follow the steps for changing a filter-drier.
Thermostatic Expansion Valve
The expansion valve is responsible for allowing the proper amount of refrigerant to enter the
evaporator regardless of cooling load. It does this by maintaining a constant superheat. (Superheat is
the difference between refrigerant temperature as it leaves the evaporator and the saturation
temperature corresponding to the evaporator pressure). All WGZ chillers are factory set for between
8°F and 12°F (4.4°C to 6.7°C) superheat at full load.
To increase the superheat setting of the valve, remove the cap at the bottom of the valve to expose the
adjustment screw. Turn the screw clockwise (when viewed from the adjustment screw end) to increase
the superheat and counterclockwise to reduce superheat. Allow time for system rebalance after each
superheat adjustment.
The expansion valve, like the solenoid valve, should not normally require replacement, but if it does,
the unit must be pumped down by following the steps involved when changing a filter-drier.
64 WGZ 030C through 200C IMM WGZC
If the problem can be traced to the power element only, it can be unscrewed from the valve
body without removing the valve, but only after pumping the unit down.
Table 40, Thermostatic Expansion Valve
!
CAUTION
Adjustment of expansion valve should only be performed by a qualified service
technician. Failure to do so can result in improper unit operation.
Note: Superheat will vary with compressor unloading, but should be approximately as follows:
between 8°F and 12°F (4.4°C and 6.7°C) at full load; between 6°F and 10°F at part load.
Water-cooled Condenser
The condenser is of the shell-and-tube type with water flowing through the tubes and
refrigerant in the shell. External finned copper tubes are rolled into steel tube sheets and to the
center dividing tube sheet. Integral subcoolers are incorporated on all units. All condensers are
equipped with 500 psig (3104 kPa) relief valves. Normal tube cleaning procedures can be
followed.
Evaporator
The evaporator is a sealed, brazed-stainless steel plate unit. Normally no service work is
required on the evaporator.
IMM WGZC WGZ 030C through 200C 65
Troubleshooting Chart
PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS
1. Close switch
2. Check electrical circuits and motor
winding for shorts or grounds.
Investigate for possible overloading.
Replace fuse or reset breakers after fault
is corrected.
3. Overloads are auto reset. Check unit
closely when unit comes back on line.
4. Repair or replace.
5. Determine type and cause of shutdown
and correct it before resetting protection
switch.
6. None. Wait until unit calls for cooling.
7. Repair or replace coil.
8. Check motor for opens, short circuit, or
burnout.
9. Check all wire junctions. Tighten all
terminal screws.
1. Check superheat setting of expansion
valve.
2. Relocate, add or remove hangers.
3. Replace.
1. Readjust temperature control or water
regulating valve. Investigate ways to
increase water supply.
2. Clean.
3. EPA purge the noncondensables.
4. Remove excess refrigerant.
5. Open valve.
6. Check condenser rating tables against
the operation.
7. Check condenser rating tables against
the operation.
1. Check condenser control operation.
2. Check for leaks. Repair and add charge.
3. See corrective steps for low suction
pressure below.
4. Check condenser rating table against the
operation.
5. Check condenser rating tables against
the operation.
1. Reduce load or add additional
equipment.
2. Check remote bulb. Regulate superheat.
1. Check for leaks. Repair and add charge.
2. Clean chemically.
3. Replace cartridge(s).
4. Clean strainers.
5. Check and reset for proper superheat.
Replace if necessary.
6. Check means for regulating condensing
temperature.
7. See corrective steps for failure of
compressor to unload.
8. Adjust flow.
1. Clean.
2. Check crankcase heater. Reset
expansion valve for higher superheat.
Check liquid line solenoid valve
operation.
3. Add oil.
4. Adjust thermal expansion valve.
Compressor Will
Not Run
Compressor
Noisy or Vibrating
High Discharge
Pressure
Low Discharge
Pressure
High Suction
Pressure
Low Suction
Pressure
Little or No Oil
Pressure
1. Main switch, circuit breakers open.
2. Fuse blown.
3. Thermal overloads tripped or fuses
blown.
4. Defective contactor or coil.
5. System shut down by equipment
protection devices.
6. No cooling required.
7. Liquid line solenoid will not open.
8. Motor electrical trouble.
9. Loose wiring.
1. Flooding of refrigerant into crankcase.
2. Improper piping support on suction or
liquid line.
3. Worn compressor.
1. Condenser water insufficient or
temperature too high.
2. Fouled condenser tubes (water-cooled
condenser). Clogged spray nozzles
(evaporative condenser). Dirty tube and
fin surface (air cooled condenser).
3. Noncondensables in system.
4. System overcharge with refrigerant.
5. Discharge shutoff valve partially closed.
6. Condenser undersized (air-cooled).
7. High ambient conditions.
1. Faulty condenser temp. regulation.
2. Insufficient refrigerant in system.
3. Low suction pressure.
4. Condenser too large.
5. Low ambient conditions.
1. Excessive load.
2. Expansion valve overfeeding.
1. Lack of refrigerant.
2. Evaporator dirty.
3. Clogged liquid line filter-drier.
4. Clogged suction line or compressor
suction gas strainers.
5. Expansion valve malfunctioning.
6. Condensing temperature too low.
7. Compressor will not unload.
8. Insufficient water flow.
1. Clogged suction oil strainer.
2. Excessive liquid in crankcase.
3. Low oil level.
4. Flooding of refrigerant into crankcase.
66 WGZ 030C through 200C IMM WGZC
PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS
1. Check for leaks and repair. Add
refrigerant.
2. Check riser sizes.
3. Check pitch of lines and refrigerant
velocities.
1. Check supply voltage for excessive line
drop.
2. Replace compressor-motor.
3. Check all connections and tighten.
4. See corrective steps for high discharge
pressure.
5. Check Supply voltage. Notify power
company. Do not start until fault is
corrected.
6. Provide ventilation to reduce heat.
1. Add facilities so that conditions are within
allowable limits.
2. Open valve.
1. Reset to 42°F (6°C) or above.
2. Adjust flow.
3. See “Low Suction Pressure.”
Compressor
Loses Oil
Motor Overload
Relays or Circuit
Breakers Open
Compressor
Thermal Switch
Open
Freeze Protection
Opens
1. Lack of refrigerant.
2. Velocity in risers too low (A-C only).
3. Oil trapped in line.
1. Low voltage during high load conditions.
2. Defective or grounded wiring in motor or
power circuits.
3. Loose power wiring.
4. High condensing temperature.
5. Power line fault causing unbalanced
voltage.
6. High ambient temperature around the
overload relay
1. Operating beyond design conditions.
2. Discharge valve partially shut.
1. Thermostat set too low.
2. Low water flow.
3. Low suction pressure.
W arranty Statement
Limited Warranty
Consult your local McQuay Representative for warranty details. Refer to Form 933-43285Y.
To find your local McQuay Representative, go to www.mcquay.com.
IMM WGZC WGZ 030C through 200C 67
68 WGZ 030C through 200C IMM WGZC
This document contains the most current product information as of this printing. For the most up-todate product information, please go to
0Hwww.mcquay.com.
All McQuay equipment is sold pursuant to McQuay’s Standard Terms and Conditions of Sale and
Limited Product Warranty. Consult your local McQuay Representative for warranty details. Refer to
Form 933-43285Y. To find your local McQuay Representative, go to www.mcquay.com.
(800) 432-1342 www.mcquay.com IMM WGZC (10/08)
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