McQuay WGZ 030CA Installation Manual
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
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