-
Installation, and Maintenance Manual IMM WGZ-2 Group: Chiller
Part Number: 331374401 Effective: October 2005 Supercedes: IOMM
WGZ-1
Water-Cooled Scroll Compressor Chillers
WGZ 030AW To WGZ 120AW, Packaged Water-Cooled Chiller
WGZ 030AA To WGZ 120AA, Chiller with Remote Condenser
30 to 120 Tons, 105 to 420 kW 60 Hz, R-22
-
2 WGZ 030A through 120A IMM WGZ-2
Table of Contents
Introduction........................................3 General
Description............................... 3 Nomenclature
........................................ 3 Inspection
.............................................. 3
Installation..........................................4
Vibration Isolators ................................. 6
Water Piping.....................................10 Flow
Switch......................................... 13 Glycol
Solutions.................................. 13 Condenser Water
Piping...................... 14 Minimum Flow Rates
.......................... 15 Water Pressure
Drop............................ 16
Refrigerant Piping ...........................18 Unit with
Remote Condenser .............. 18 Factory-Mounted
Condenser............... 22
Dimensional Data.............................23 Physical
Data....................................27
AW Water-Cooled................................ 27 AA Remote
Condenser ........................ 30 Operating
Limits.................................. 31
Components......................................... 32
Wiring ...............................................33 Unit
Configuration ..........................34 Electrical
Data..................................35
Field Wiring Diagram.......................... 41 Control Panel
Layout .......................... 44 Motor Protection
Module.................... 44
Start-Up and Shutdown .................. 45 Pre
Start-up.......................................... 45 Start-up
................................................ 45 Weekend or
Temporary Shutdown ...... 46 Start-up after Temporary Shutdown ....
46 Extended Shutdown............................. 46 Start-up after
Extended Shutdown ...... 47
System Maintenance........................ 48 General
................................................ 48 Electrical
Terminals............................. 49 Compressor
Lubrication...................... 49 Sight glass and Moisture
Indicator...... 49 Crankcase Heaters
............................... 50 Optional Controls
................................ 50 Phase/Voltage Monitor
(Optional) ...... 50 Hot Gas Bypass (Optional) .................
51
Maintenance Schedule .................... 52 System Service
................................. 53
Troubleshooting Chart......................... 55 Warranty
Statement ........................ 56
"McQuay" is a registered trademark of McQuay International ©2005
McQuay International
Illustrations and data cover McQuay International products at
the time of publication and we reserve the right to make changes in
design and construction at anytime without notice.
Manufactured in an ISO Certified facility
-
IMM WGZ-2 WGZ 030A through 120A 3
Introduction
General Description McQuay Type WGZ water chillers are designed
for indoor installations and are available with water-cooled
condensers (Model AW), or arranged for use with remote air-cooled
or evaporative condensers (Model AA). Each water-cooled unit is
completely assembled and factory wired before evacuation, charging
and testing. They consist of hermetic scroll compressors,
brazed-plate evaporator, water-cooled condenser (WGZ-AW), and
complete refrigerant piping.
Units manufactured for use with remote condensers (Models
WGZ-AA) 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 - A W
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 shipping and operating weights are given in the
physical data tables beginning on page 27.
Water-Cooled
Global
Scroll Compressor Nominal Capacity (Tons)
W = Water-Cooled CondenserA = Unit Less Condenser
Design Vintage
-
4 WGZ 030A through 100A IMM WGZ-2
RemovableLiftingBar
(2) 2”LiftingHoles
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-AW 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-AA.
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 Shipping skids are an option and if not
supplied, some means such as dollies or skids must be field
furnished to protect the unit from accidental damage and to permit
easy handling and moving.
Figure 1, Lifting the Unit
It is recommended that all moving and handling be performed with
skids or dollies under the unit when possible and that they not be
removed until the unit is in the final location.
-
IMM WGZ-2 WGZ 030A through 120A 5
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 Figure 1). The arms should be
removed and discarded after use. 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 Package Units (lbs. Less Condenser Units
(lbs)
Model L1 L2 L3 L4 Shipping Weight L1 L2 L3 L4
Shipping Weight
WGZ 030 564 616 655 715 2551 469 502 562 601 2134 WGZ 035 572
626 672 736 2606 473 507 576 617 2172 WGZ 040 584 641 695 764 2684
477 514 592 637 2219 WGZ 045 596 658 717 792 2763 486 525 610 659
2281 WGZ 050 604 668 739 817 2828 487 527 625 676 2315 WGZ 055 646
719 761 846 2973 526 577 643 705 2452 WGZ 060 800 892 855 953 3500
620 673 675 733 2701 WGZ 070 863 966 890 996 3716 673 735 700 764
2871 WGZ 080 900 1009 961 1077 3947 702 769 763 837 3071 WGZ 090
908 1021 1019 1145 4094 700 769 812 892 3172 WGZ 100 916 1031 1059
1191 4197 696 771 841 931 3238 WGZ 110 931 1046 1067 1196 4240 706
781 846 936 3268 WGZ 120 937 1050 1077 1211 4275 706 781 861 951
3298
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.
Note: Unit shipping and operating weights are given in Table 1
and in the physical data tables beginning on page 27.
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.
-
6 WGZ 030A through 100A IMM WGZ-2
Control Panel
WaterConnections
4
1
3
2
LB
LF
RB
FRF
On units equipped with a water-cooled condenser (Type WGZ-AW)
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 aperture. 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 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. 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.
Table 2, Weights & Vibration Mountings ARRANGEMENT WGZ-AW,
WITH WATER-COOLED CONDENSERS
Corner Weight Lbs (kg) Neoprene-In-Shear Mountings Spring-Flex
Mountings Unit Size
Opr. Wt. Lbs. (kg) 1 2 3 4 1 2 3 4 1 2 3 4
030 2692 (1219)
589 (267)
648 (294)
692 (314)
762 (345)
RP-3 Green
RP-3 Green
RP-3 Green
RP-3 Gray
CP-1 Green
CP-1 Green
CP-1 Green
CP-1 Green
035 2760 (1250)
599 (271)
661 (299)
713 (323)
787 (356)
RP-3 Green
RP-3 Green
RP-3 Green
RP-3 Gray
CP-1 Green
CP-1 Green
CP-1 Green
CP-1 Green
040 2866 (1298)
616 (279)
682 (309)
744 (337)
824 (373)
RP-3 Gray
RP-3 Gray
RP-3 Gray
RP-3 Gray
CP-1 Gray
CP-1 Gray
CP-1 Gray
CP-1 Gray
045 2966 (1344)
632 (286)
702 (318)
773 (350)
860 (389)
RP-3 Gray
RP-3 Gray
RP-3 Gray
RP-3 Gray
CP-1 Gray
CP-1 Gray
CP-1 Gray
CP-1 Gray
050 3058 (1385)
644 (292)
718 (325)
802 (363)
894 (405)
RP-3 Gray
RP-3 Gray
RP-3 Gray
RP-3 Gray
CP-1 Gray
CP-1 Gray
CP-1 Gray
CP-1 Gray
055 3213 (1455)
688 (312)
772 (350)
826 (374)
927 (420)
RP-3 Gray
RP-3 Gray
RP-3 Gray
RP-3 Gray
CP-1 Gray
CP-1 Gray
CP-1 Gray
CP-1 Gray
060 3809 (1725)
853 (386)
959 (435)
940 (426)
1057 (479)
RP-4 Black
RP-4 Black
RP-4 Black
RP-4 Black
CP-1 White
CP-1 White
CP-1 White
CP-1 White
Continued next page
-
IMM WGZ-2 WGZ 030A through 120A 7
Corner Weight Lbs (kg) Neoprene-In-Shear Mountings Spring-Flex
Mountings Unit
Size Opr. Wt. Lbs. (kg) 1 2 3 4 1 2 3 4 1 2 3 4
070 4025 (1823)
916 (415)
1033 (468)
975 (442)
1100 (498)
RP-4 Black
RP-4 Black
RP-4 Black
RP-4 Black
CP-1 White
CP-1 White
CP-1 White
CP-1 White
080 4289 (1943)
958 (434)
1082 (490)
1056 (478)
1193 (540)
RP-4 Black
RP-4 Black
RP-4 Black
RP-4 Black
CP-2 Green
CP-2 Green
CP-2 Green
CP-2 Green
090 4484 (2031)
974 (441)
1103 (500)
1129 (511)
1278 (579)
RP-4 Black
RP-4 Black
RP-4 Black
RP-4 Black
CP-2 Green
CP-2 Green
CP-2 Green
CP-2 Green
100 4627 (2096)
989 (448)
1121 (508)
1170 (534)
1337 (606)
RP-4 Black
RP-4 Black
RP-4 Black
RP-4 Black
CP-2 Green
CP-2 Green
CP-2 Green
CP-2 Green
110 4670 (2120)
1010 (459)
1140 (518)
1178 (535)
1342 (609)
RP-4 Black
RP-4 Black
RP-4 Black
RP-4 Black
CP-2 Green
CP-2 Green
CP-2 Green
CP-2 Green
120 4705 (2136)
1015 (461)
1145 (520)
1195 (543)
1350 (613)
RP-4 Black
RP-4 Black
RP-4 Black
RP-4 Black
CP-2 Green
CP-2 Green
CP-2 Green
CP-2 Green
ARRANGEMENT WGZ-AA, FOR REMOTE CONDENSER
Corner Weight Lbs (kg) Neoprene-In-Shear Mountings Spring-Flex
Mountings Unit Size
Opr. Wt. Lbs. (kg) 1 2 3 4 1 2 3 4 1 2 3 4
030 2162 (979)
468 (212)
502 (227)
575 (260)
616 (279)
RP-3 Green
RP-3 Green
RP-3 Green
RP-3 Green
CP-1 Purple
CP-1 Purple
CP-1 Orange
CP-1 Orange
035 2204 (998)
472 (214)
507 (230)
590 (267)
634 (287)
RP-3 Green
RP-3 Green
RP-3 Green
RP-3 Green
CP-1 Purple
CP-1 Purple
CP-1 Orange
CP-1 Orange
040 2257 (1022)
477 (216)
514 (233)
609 (276)
657 (297)
RP-3 Green
RP-3 Green
RP-3 Green
RP-3 Green
CP-1 Purple
CP-1 Purple
CP-1 Orange
CP-1 Orange
045 2329 (1055)
487 (220)
526 (238)
633 (287)
684 (310)
RP-3 Green
RP-3 Green
RP-3 Green
RP-3 Green
CP-1 Purple
CP-1 Purple
CP-1 Orange
CP-1 Orange
050 2370 (1074)
488 (221)
528 (239)
650 (295)
704 (319)
RP-3 Green
RP-3 Green
RP-3 Green
RP-3 Green
CP-1 Purple
CP-1 Purple
CP-1 Orange
CP-1 Orange
055 2505 (1135)
526 (238)
578 (262)
668 (303)
734 (332)
RP-3 Green
RP-3 Green
RP-3 Green
RP-3 Green
CP-1 Purple
CP-1 Purple
CP-1 Orange
CP-1 Orange
060 2771 (1255)
619 (280)
674 (305)
707 (320)
770 (349)
RP-3 Green
RP-3 Green
RP-3 Gray
RP-3 Gray
CP-1 Orange
CP-1 Orange
CP-1 Green
CP-1 Green
070 2942 (1333)
672 (304)
736 (333)
732 (332)
801 (363)
RP-3 Green
RP-3 Green
RP-3 Gray
RP-3 Gray
CP-1 Orange
CP-1 Orange
CP-1 Green
CP-1 Green
080 3154 (1429)
702 (318)
771 (349)
801 (363)
880 (399)
RP-3 Green
RP-3 Gray
RP-3 Gray
RP-3 Gray
CP-1 Orange
CP-1 Green
CP-1 Green
CP-1 Gray
090 3271 (1482)
700 (317)
771 (349)
857 (388)
944 (427)
RP-3 Green
RP-3 Gray
RP-3 Gray
RP-3 Gray
CP-1 Orange
CP-1 Green
CP-1 Green
CP-1 Gray
100 3346 (1516)
697 (316)
773 (350)
890 (403)
987 (447)
RP-3 Green
RP-3 Gray
RP-3 Gray
RP-3 Gray
CP-1 Orange
CP-1 Green
CP-1 Green
CP-1 Gray
110 3375 (1532)
707 (320)
783 (355)
895 (406)
990 (449)
RP-3 Green
RP-3 Gray
RP-3 Gray
RP-3 Gray
CP-2 Green
CP-2 Green
CP-2 Green
CP-2 Green
120 3405 (1546)
707 320)
783 (355)
910 (413)
1005 (456)
RP-3 Green
RP-3 Gray
RP-3 Gray
RP-3 Gray
CP-2 Green
CP-2 Green
CP-2 Green
CP-2 Green
-
8 WGZ 030A through 100A IMM WGZ-2
Table 3, Spring Flex Isolators Dimensions
In. (mm) Housing Spring Color
Max. Load Each
Lbs. (kg)
Defl. In. (mm)
A B C D E
Housing Part Number
Spring Part Number
CP-1 Red 450 (204) 1.22 (30.9
7.5 (190.5)
6.0 (152.4)
4.7 (119.4)
2.7 (68.6)
5.5 (139.7) 226102B-00 226115A-00
CP-1 Purple 600 (272) 1.17
(29.7) 7.5
(190.5)6.0
(152.4)4.7
(119.4) 2.7
(68.6) 5.5
(139.7) 226102B-00 226116A-00
CP-1 Orange 750 (340) 1.06
(26.9) 7.5
(190.5)6.0
(152.4)4.7
(119.4) 2.7
(68.6) 5.5
(139.7) 226102B-00 226117A-00
CP-1 Green 900 (408) 1.02
(25.9) 7.5
(190.5)6.0
(152.4)4.7
(119.4) 2.7
(68.6) 5.5
(139.7) 226102B-00 226118A-00
CP-1 Gray 1100 (498) 0.83
(21.0) 7.5
(190.5)6.0
(152.4)4.7
(119.4) 2.7
(68.6) 5.5
(139.7) 226102B-00 226119A-00
CP-1 White 1300 (589) 0.74
(18.7) 7.5
(190.5)6.0
(152.4)4.7
(119.4) 2.7
(68.6) 5.5
(139.7) 226102B-00 226120A-00
CP-2 Green 1800 (815) 1.02
(25.9) 10.2
(259.1)9.0
(228.6)7.7
(195.6) 2.7
(68.6) 5.75
(146.0) 226103B-00 (2) 226118A-00
NOTE: CP-1 housing contains one spring. CP-2 housing contains
two identical springs.
Table 4, Neoprene-in-Shear Isolators Dimensions
In. (mm) Type Max. Load
Each Lbs. (kg)
Defl. In. (mm)
A B C D (1) E H L W
McQuay Part Number
RP-3 Green 750 (339) 0.25 (6.4)
2.5 (63.5)
0.5 (12.7)
4.1 (104.1)
0.56 (14.2)
0.25 (6.4)
1.75 (44.4)
5.5 (165)
3.4 (85.7) 216397A-03
RP-3 Gray 1100 (498) 0.25 (6.4)
2.5 (63.5)
0.5 (12.7)
4.1 (104.1)
0.56 (14.2)
0.25 (6.4)
1.75 (44.4)
5.5 (165)
3.4 (85.7) 216397A-05
R-4 Black 1500 (679) 0.25 (6.4)
3.75 (95.3)
0.5 (12.7)
5.0 (127.0)
0.56 (14.2)
0.25 (6.4)
1.6 (41.1)
6.5 (165.1)
4.6 (116.8) 216398A-04
Note (1) "D" is the mounting hole diameter.
-
IMM WGZ-2 WGZ 030A through 120A 9
Figure 3, Spring Flex Mounting. CP-2
Figure 4, Neoprene-in-Shear Mounting, RP-3
Figure 5, Spring Flex Mounting, CP-1
Figure 6, Neoprene-in-Shear, R4
-
10 WGZ 030A through 100A IMM WGZ-2
Water Piping
Vessel Drains at Start-up Condensers are drained of water in the
factory and are shipped with 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. 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.
-
IMM WGZ-2 WGZ 030A through 120A 11
Note: A water flow switch or pressure differential switch must
be mounted in the evaporator outlet water line to signal that there
is water flow before the unit will start.
Figure 7, Typical Field Evaporator Water Piping Air
Vent
FlowSwitch
VibrationEliminators
Drain
Outlet
Inlet
PIsolationValves
Strainer
NOTE: Water piping must be supported independently from the
unit.
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, we recommend a minimum system volume of
four minutes times the flow rate (GPM). For example, if the design
chiller flow rate is 120 gpm, we recommend a minimum system volume
of 480 gallons (120 gpm x 4 minutes).
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.
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.
-
12 WGZ 030A through 100A IMM WGZ-2
SuctionCircuit #1SuctionCircuit #2
LiquidCircuit #2LiquidCircuit #1
Leaving ChilledWater Sensor
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 on page 16. Vibration eliminators are recommended in
both the supply and 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.
Chilled Water Sensor Figure 8, Thermostat Well Location
The chilled water sensor is factory installed in the leaving
water 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.
CAUTION The thermostat bulb should not be exposed to water
temperatures above 125°F
(51.7°C) since this will damage it.
-
IMM WGZ-2 WGZ 030A through 120A 13
Flow Switch A water flow switch must be mounted in the leaving
evaporator and condenser water line 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. 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
minimum flow rates are required to close the switch and are listed
in Table 5. Electrical connections in the unit control center
should be made at terminals 33 and 43 (chilled water) and 41 and 53
(condenser water). The normally open contacts of the flow switch
should be wired between these two terminals. 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. 3. Trim flow switch paddle if needed to
fit the pipe diameter. Make sure paddle does not
hang up in pipe.
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 (see wiring
diagram inside control box door). Incorrect installation will cause
improper operation and possible
evaporator damage.
Table 5, Flow Switch Flow Rates inch 2 2 1/2 3 4 5 6 Pipe Size
mm 51 63 76 102 (125) (150) gpm 13.7 17.9 24.2 35.3 48.6 60.3 Flow
Lpm 51.8 67.8 91.6 134.0 184.0 228.0 gpm 9.4 12.1 16.4 27.0 37.4
46.8
Minimum Adjustment No
Flow Lpm 35.6 45.8 62.1 102.0 142.0 177.0 gpm 56.4 71.3 89.0
118.0 178.0 245.0 Flow Lpm 214.0 270.0 337.0 446.0 674.0 927.0 gpm
47.4 59.2 72.5 105.0 160.0 225.0
Maximum Adjustment No
Flow Lpm 179.0 224.0 274.0 397.0 606.0 852.0
Glycol Solutions When using a glycol solution, the chiller
capacity, flow rate, evaporator pressure drop, and chiller power
input can be calculated using the following formulas and reference
to Table 6 for ethylene glycol and Table 7 for 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 ΔT) knowing ΔT (or gpm)
and capacity:
TablesFromGCorrectionFlowxT
CapacityGlycolxGPMGlycol
Δ=
24
-
14 WGZ 030A through 100A IMM WGZ-2
For Metric Applications -- Determine evaporator lps (or ΔT)
knowing ΔT (or lps) and kW:
TablesfromGCorrectionFlowxTx
kWLpsGlycolΔ
=18.4
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 6 or Table 7. 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 6, Ethylene Glycol Freezing Point Percent
Glycol °F °C C (Capacity) K (Power) G (Flow) P (Pressure
Drop)
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
Table 7, Propylene Glycol Freezing Point Percent
Glycol °F °C C (Capacity) K (Power) G (Flow) P (Pressure
Drop)
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
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.
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 17. Vibration eliminators are recommended in both
the supply and return water lines. Install a 20-mesh strainer in
the inlet piping to the condenser.
-
IMM WGZ-2 WGZ 030A through 120A 15
Circuit #1 Outlet
Condenser
TemperatureControlValve
CondenserWater
Circuit #2 Outlet
Circuit #1 Inlet
Circuit #2 Inlet
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 60°F. 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 for some reason the tower
water temperature cannot be maintained at a 60°F minimum, or when
pond, lake, or well water that can fall below 60°F (15°C) is used
as the condensing medium, special discharge pressure control must
be used. A water recirculating system with recirculating pump as
shown in Figure 9 is recommended. This system also has the
advantage of maintaining tube velocity to help prevent tube
fouling. The pump should cycle with the chiller. Figure 9,
Recirculating Discharge Pressure Control System
Minimum Flow Rates Design Full Load Chilled Water Flows The
evaporator flow rates and pressure drops shown on the following
page 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.
Minimum Flows for Variable Flow Pumping Systems This design full
load minimum flow is not to be confused with the part load minimum
flow rate that must be maintained for chillers operating in primary
variable flow pumping systems. As chiller load drops, the flow rate
for this pumping system also reduces. See the following table for
the minimum part load flow rates. Other design practices for
variable flow systems requiring a range of evaporator flow rates
can be found on page 11.
These minimum flow rates assume that flow will be reduced
proportionally to the cooling load.
Table 8, Minimum Part Load Flow Rates WGZ Model 030 035 040 045
050 055 060 070 080 090 100 110 120
Minimum Part Load Flow 30 34 38 43 47 53 58 67 74 83 91 102
113
-
16 WGZ 030A through 100A IMM WGZ-2
Water Pressure Drop Figure 10, Evaporator Water Pressure Drop,
WGZ 030A through 120A
30 40 50 60 70 80 90 100 200 300 400 500 600
2
3
4
5
6
7
8
910
20
30
40
Flow Rate (GPM)
Pres
sure
Dro
p (ft
of w
ater
)Flow Rate (L/s)
1.9 2.5 3.2 3.8 4.4 5.0 5.7 6.3 12.6 18.9 25.2 31.5 37.9
6
12
18
24
2730
9
21
15
60
90
120Pressure D
rop (kPa)44.2
700
WGZ 030
1 3
WGZ 080
WGZ 040
WGZ 050
WGZ 035
WGZ 045
WGZ 055WGZ 070
WGZ 090
WGZ 060
WGZ 100 - 120
Minimum Flow Nominal Flow Maximum Flow Inch-Pound S.I.
Inch-Pound S.I. Inch-Pound S.I.
WGZ Model
GPM Ft. L/S kPa GPM Ft. L/S kPa GPM Ft. L/S kPa 030 56.9 2.66
3.59 7.96 94.8 7.40 5.98 22.11 158.0 20.55 9.97 61.43 035 62.8 3.25
3.96 9.71 104.7 9.02 6.61 26.97 174.5 25.07 11.01 74.93 040 72.2
2.83 4.55 8.45 120.3 7.85 7.59 23.46 200.5 21.80 12.65 65.17 045
79.6 3.43 5.02 10.26 132.6 9.54 8.37 28.51 221.0 26.49 13.94 79.18
050 87.5 3.02 5.52 9.02 145.8 8.38 9.20 25.05 243.0 23.28 15.33
69.58 055 97.7 3.77 6.17 11.26 162.9 10.46 10.28 31.27 271.5 29.06
17.13 86.85 060 107.3 3.38 6.77 10.11 178.8 9.39 11.28 28.07 298.0
26.09 18.80 77.97 070 122.4 3.45 7.72 10.31 204.0 9.58 12.87 28.64
340.0 26.62 21.45 79.56 080 140.4 3.92 8.86 11.72 234.0 10.89 14.76
32.56 390.0 30.26 24.61 90.45 090 154.4 3.95 9.74 11.81 257.4 10.97
16.24 32.80 429.0 30.48 27.07 91.11 100 168.7 3.55 10.64 10.62
281.1 9.87 17.73 29.50 468.5 27.41 29.56 81.94 110 191.2 4.56 12.06
13.64 318.6 12.68 20.10 37.89 531.0 35.21 33.50 105.26 120 211.0
5.56 13.31 16.61 351.6 15.44 22.18 46.15 586.0 42.89 36.97
128.19
Note: Minimum, nominal, and maximum flows are at a 16°F, 10°F,
and 6°F chilled water temperature range respectively and at ARI
tons. See previous page.
-
IMM WGZ-2 WGZ 030A through 120A 17
Figure 11, Condenser Water Pressure Drop, WGZ 030AW through
120AW
30 40 50 60 70 80 90 100 200 300 400 500 600
2
3
4
5
6
7
8
910
20
30
40
50
60
70
Flow Rate (GPM)
Pres
sure
Dro
p (ft
of w
ater
)
Flow Rate (L/s)
1.9 2.5 3.2 3.8 4.4 5.0 5.7 6.3 12.6 18.9 25.2 31.5 37.9
6
12
18
24
2730
9
21
15
60
90
120
150
180
210Pressure D
rop (kPa)44.2
700
WGZ 030, 035
WGZ 040, 045
WGZ 050, 055 WGZ 090
WGZ 080
WGZ 070
WGZ 060
WGZ 100 - 120
Minimum Flow Nominal Flow Maximum Flow
Flow Rate Pressure Drop Flow Rate Pressure Drop Flow Rate
Pressure Drop WGZ Model gpm L/s ft. kPa gpm L/s ft. kPa gpm L/s ft.
kPa
030 56.9 3.59 2.66 7.96 94.8 5.98 7.40 22.11 158.0 9.97 20.55
61.43 035 62.8 3.96 3.25 9.71 104.7 6.61 9.02 26.97 174.5 11.01
25.07 74.93 040 72.2 4.55 2.83 8.45 120.3 7.59 7.85 23.46 200.5
12.65 21.80 65.17 045 79.6 5.02 3.43 10.26 132.6 8.37 9.54 28.51
221.0 13.94 26.49 79.18 050 87.5 5.52 3.02 9.02 145.8 9.20 8.38
25.05 243.0 15.33 23.28 69.58 055 97.7 6.17 3.77 11.26 162.9 10.28
10.46 31.27 271.5 17.13 29.06 86.85 060 107.3 6.77 3.38 10.11 178.8
11.28 9.39 28.07 298.0 18.80 26.09 77.97 070 122.4 7.72 3.45 10.31
204.0 12.87 9.58 28.64 340.0 21.45 26.62 79.56 080 140.4 8.86 3.92
11.72 234.0 14.76 10.89 32.56 390.0 24.61 30.26 90.45 090 154.4
9.74 3.95 11.81 257.4 16.24 10.97 32.80 429.0 27.07 30.48 91.11 100
168.7 10.64 3.55 10.62 281.1 17.73 9.87 29.50 468.5 29.56 27.41
81.94 110 191.2 12.06 4.56 13.64 318.6 20.10 12.68 37.89 531.0
33.50 35.21 105.26 120 211.0 13.31 5.56 16.61 351.6 22.18 15.44
46.15 586.0 36.97 42.89 128.19
-
18 WGZ 030A through 100A IMM WGZ-2
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.
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-AA) such as air-cooled or
evaporative condenser, the chillers are shipped with an R-22
holding charge. Some special order units may have R-407c
refrigerant. The unit is evacuated in the factory to 500 microns
before charging with a holding charge of R-22 (407c) refrigerant.
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.
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
-
IMM WGZ-2 WGZ 030A through 120A 19
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 run refrigerant piping underground.
After the equipment is properly installed, leak tested, and
evacuated, it can be charged with R-22, 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.
NOTE: On WGZ-AA 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 Figure 12 and Figure 13). 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. A relief device is also
recommended in the hot gas piping at the condenser coil as shown in
Figure 12 and Figure 13.
Install a discharge check valve in the discharge line, in a
horizontal run, close to the condenser.
-
20 WGZ 030A through 100A IMM WGZ-2
Typical Arrangements Figure 12 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 13 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 WGZ-2 WGZ 030A through 120A 21
Condenser
Relief Valve
Check Valve
Purge Valve
Discharge Line
Loop
Receiver
ReceiverBypass
ToEvap.
PreferredSubcoolerHook-up
Relief Valve(Vent to Outdoorsor to Condenser Sideof Liquid
LineCheck Valve)
Pitch
CheckValve
Subcooler
Condenser
Relief Valve
Check Valve
Purge Valve
Relief Valve(Vent to Outdoorsor to Condenser Sideof Liquid
LineCheck Valve)
Pitch
CheckValve
Discharge Line
Receiver
ReceiverBypass
ToEvap.
PreferredSubcoolerHook-up
CheckValve
Subcooler
Figure 12, Condenser Above Compressor and Optional Receiver
Installation
Figure 13, 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.
-
22 WGZ 030A through 100A IMM WGZ-2
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.
Figure 14, Relief Valve Piping
-
IMM WGZ-2 WGZ 030A through 120A 23
Dimensional Data WGZ-AW Water-Cooled Figure 15, WGZ 030AW
through WGZ 055AW
L
A
121.43085
(4) .875" (22 mm)
Inlet
Outlet
OutletInlet
H
W
Y
1.538
29711
1.538
13.25337
8204
14354
27.8707
52.41331
Z
X
Condenser
Evaporator
12.3311
20508
Control Connection
Evaporator
Power Connections(2) .875" (22 mm)
Mounting Holes
Door Swing Recommendedfor Servicing
38965
36915
4.5114
MicroTech II User Interface
Relief Valves(1) Each End
T
Maximum Overall Dimensions
in (mm)
Chilled Water Connection
in. (mm) Victaulic
Condenser Water
Connections in. (mm) Victaulic
Center of Gravity WGZ Model Number
L W H Size A Size T X Y Z
030 134.1 (3406) 32
(813) 63.5
(1613) 3”
(76) 114.3 (2903)
4 (102)
3.0 (76.2)
62.9 (1596)
26.8 (680)
13.4 (340)
035 134.1 (3406) 32
(813) 63.5
(1613) 3”
(76) 115.2 (2926)
4 (102)
3.0 (76.2)
63.3 (1607)
26.9 (682)
13.4 (340)
040 134.1 (3406) 32
(813) 63.5
(1613) 3”
(76) 116.5 (2959)
4 (102)
3.0 (76.2)
63.7 (1618)
26.9 (682)
13.4 (340)
045 134.1 (3406) 32
(813) 63.5
(1613) 3”
(76) 117.8 (2992)
4 (102)
3.0 (76.2)
64.1 (1627)
27.1 (688)
13.4 (340)
050 134.1 (3406) 32
(813) 63.5
(1613) 3”
(76) 119.1 (3025)
4 (102)
3.0 (76.2)
64.6 (1640)
27.1 (688)
13.4 (340)
055 134.1 (3406) 32
(813) 63.5
(1613) 3”
(76) 121.0 (3073)
4 (102)
3.0 (76.2)
63.6 (1614)
27.3 (693)
13.3 (338)
See NOTES on the bottom of page 24.
-
24 WGZ 030A through 100A IMM WGZ-2
Figure 16, WGZ-060AW through WGZ-120AW
H
W
9.8248
18458
33.5852
58.11476
121.13075
13.25337
1.538 737
1.538
A
X
Y
Z
(4) .875" (22 mm)
Inlet
Outlet
Outlet
InletCondenser
Diameter Mounting Holes
Evaporator
T
Evaporator
7.7196
L
Control Connection
Power Connections
15382
20508
(2) .875" (22 mm)
Door SwingClearance Recommendedfor Servicing
38965
36915
4.5114
MicroTech II User Interface
Relief Valves(1) Each End
Maximum Overall Dimensions
in (mm)
Chiller Water Connection
in. (mm) Victaulic
Condenser Water Connections
in. (mm) Victaulic
Center of Gravity WGZ Model Number
L W H Size A Size T X Y Z
060 144.2 (3663) 32
(813) 66
(1676) 3
(76) 117.3 (2980)
5 (127)
10.3 (263)
61.0 (1549)
30.5 (775)
13.4 (340)
070 148.2 (3764) 32
(813) 66
(1676) 3
(76) 119.5 (3036)
5 (127)
14.4 (367)
60 (1525)
31.6 (804)
13.4 (340)
080 148.2 (3764) 32
(813) 66
(1676) 3
(76) 122.6 (3114)
5 (127)
14.4 (367)
61.1 (1553)
32.8 (834)
13.4 (340)
090 149 (3785) 32
(813) 66
(1676) 3
(76) 126.6 (3216)
5 (127)
15.3 (388)
62.7 (1591)
33.2 (843)
13.4 (340)
100 149 (3785) 32
(813) 66
(1676) 3
(76) 128.9 (3274)
5 (127)
15.3 (388)
63.6 (1614)
33.0 (839)
13.4 (340)
110 149 (3785) 32
(813) 66
(1676) 3
(76) 128.9 (3274)
5 (127)
15.4 (390)
63.3 (1608)
33.6 (854)
13.4 (340)
120 149 (3785) 32
(813) 66
(1676) 3
(76) 128.9 (3274)
5 (127)
15.4 (390)
61.2 (1555)
34.2 (870)
13.4 (340)
NOTES 1. Allow a minimum of three feet (one meter) service
clearance on all four sides of the unit. Allow sufficient space at
one end for
tube cleaning or replacement.
-
IMM WGZ-2 WGZ 030A through 120A 25
2. Allow two additional inches in width for the optional
disconnect switch handle. WGZ-AA Remote Condenser Figure 17,
Dimensions, WGZ 030AA – WGZ 055AA
121.43085
L A
X
B C D F
"G" Disch. System #2 "G" Disch. System #1
"E" Liquid System #2 "E" Liquid System #1
Inlet
Outlet
Power Connections(2) - .875 (22 mm)
Evaporator
Control Connection
(4) - .875 (22 mm)
13.8350
27.8707
52.41331
24.1613
"G" Disch Conn
12.5318
20508
4.5114
H
Y
"E" Liquid Conn
W
1.538
29737
1.538
Z
Mounting Holes
Door SwingClearance
Recommendedfor Servicing
38965
36915
MicroTech II User Interface
T
Refrigerant Piping Connections Maximum Overall Dimensions
In. (mm)
Evaporator Connection
In. (mm) Victaulic
System #1 System #2 Connection Size Center of Gravity WGZ
Model
L W H Size A Liquid
F Discharge
C Liquid
D Discharge
B Liquid
E Discharge
G T X Y Z
030 125.4 (3186) 32
(813) 63.5
(1613) 3
(76) 114.3 (2903)
54.6 (1386)
39.2 (996)
53.7 (1363)
43.3 (1101)
.875 (22)
1.125 (29)
2.0 (51)
66.0 (1677)
31.0 (788)
14.0 (356)
035 125.4 (3186) 32
(813) 63.5
(1613) 3
(76) 115.2 (2926)
54.6 (1386))
39.2 (996)
53.7 (1363)
43.3 (1101)
.875 (22)
1.125 (29)
2.0 (51))
66.5 (1689)
31.2 (792)
14.0 (356)
040 125.4 (3186) 32
(813) 63.5
(1613) 3
(76) 116.5 (2959)
54.6 (1386)
39.2 (996)
53.7 (1363)
43.3 (1101)
.875 (22)
1.125 (29)
2.0 (51)
67.0 (1702)
31.3 (796)
14.0 (356)
045 125.4 (3186) 32
(813) 63.5
(1613) 3
(76) 117.8 (2992)
54.6 (1386)
39.2 (996)
53.7 (1363))
43.3 (1101)
.875 (22)
1.125 (29)
2.0 (51))
67.4 (1712)
31.5 (801
13.9 (354)
050 125.4 (3186) 32
(813) 63.5
(1613) 3
(76) 119.1 (3025)
54.6 (1386)
39.2 (996)
53.7 (1363)
43.3 (1101)
.875 (22)
1.125 (29)
2.0 (51)
68.0 (1728)
31.7 (804)
13.9 (354
055 125.4 (3186) 32
(813) 63.5
(1613) 3
(76) 121.0 (3073
60.9 (1546)
44.6 (1132)
47.4 (1203)
38.0 (964)
.875 (22)1.125 (29)
1.125 (29) 1.375 (35)
2.0 (51))
66.6 (1692)
31.8 (809)
13.8 (351)
See NOTES on the bottom of page 24.
-
26 WGZ 030A through 100A IMM WGZ-2
Figure 18, Dimensions WGZ 060AA – 120AA
H
W
9.8248
18458
33.5852
58.11476
121.13075
13.25337
1.538 737
1.538
A
X
Y
Z
(4) .875" (22 mm)
Inlet
Outlet
Outlet
InletCondenser
Diameter Mounting Holes
Evaporator
T
Evaporator
7.7196
L
Control Connection
Power Connections
15382
20508
(2) .875" (22 mm)
Door SwingClearance Recommendedfor Servicing
38965
36915
4.5114
MicroTech II User Interface
Relief Valves(1) Each End
Maximum Overall Dimensions
in (mm)
Chiller Water Connection
in. (mm) Victaulic
Condenser Water Connections
in. (mm) Victaulic Center of Gravity WGZ Model
Number L W H Size A Size T X Y Z
060 144.2 (3663) 32
(813) 66
(1676) 3
(76) 117.3 (2980)
5 (127)
10.3 (263)
61.0 (1549)
30.5 (775)
13.4 (340)
070 148.2 (3764) 32
(813) 66
(1676) 3
(76) 119.5 (3036)
5 (127)
14.4 (367)
60 (1525)
31.6 (804)
13.4 (340)
080 148.2 (3764) 32
(813) 66
(1676) 3
(76) 122.6 (3114)
5 (127)
14.4 (367)
61.1 (1553)
32.8 (834)
13.4 (340)
090 149 (3785) 32
(813) 66
(1676) 3
(76) 126.6 (3216)
5 (127)
15.3 (388)
62.7 (1591)
33.2 (843)
13.4 (340)
100 149 (3785) 32
(813) 66
(1676) 3
(76) 128.9 (3274)
5 (127)
15.3 (388)
63.6 (1614)
33.0 (839)
13.4 (340)
110 149 (3785) 32
(813) 66
(1676) 3
(76) 128.9 (3274)
5 (127)
15.4 (390)
63.3 (1608)
33.6 (854)
13.4 (340)
120 149 (3785) 32
(813) 66
(1676) 3
(76) 128.9 (3274)
5 (127)
15.4 (390)
61.2 (1555)
34.2 (870)
13.4 (340)
Notes: 1. Allow a minimum of 3 ft (1 meter) service clearance on
all 4 sides of the unit. Allow sufficient space on one end for
condenser tube
cleaning and replacement. Allow 4 ft clearance in front of the
control panel. 2. Allow two additional inches in width for optional
disconnect switch.
-
IMM WGZ-2 WGZ 030A through 120A 27
Physical Data
AW Water-Cooled Table 9, WGZ 030AW – WGZ 055AW
WGZ UNIT SIZE 030 035 040 045 050 055 Unit capacity @ ARI
conditions tons, (kW) (1) 31.6 (111.1) 34.9 (122.7) 40.1 (141) 44.2
(155) 48.6 (171) 54.3 (191)
No. Circuits 2 2 2 2 2 2 COMPRESSORS (2) Nominal Tons 7.5 9 9 9
10 10 13 10 13 13 13 15 Number 2 2 2 2 2 2 2 2 2 2 2 2 Unloading
Steps, % 27 / 50 / 77 25 / 50 / 75 25 / 50 / 75 28 / 50 / 78 25 /
50 / 75 27 / 50 / 77 Oil Charge per Compressor oz., (l) 140 (4.1)
140 (4.1) 140 (4.1) 140 (4.1) 140 (4.1) 140 (4.1) 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 450
(3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102) Water
Side 232 (1599) 232 (1599) 232 (1599) 232 (1599) 232 (1599) 232
(1599) No. of Passes 2 2 2 2 2 2 Pump-Out Capacity, lb., (kg) (3)
279 (126.6) 273 (123.8) 260 (117.9) 253 (114.8) 240 (108.9) 234
(106.1) Connections: Water In & Out, in, (mm) Victaulic 4 (102)
4 (102) 4 (102) 4 (102) 4 (102) 4 (102) Relief Valve, Flare In.,
(mm) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7) 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) FPT ½ (12.7) ½ (12.7) ½ (12.7)
½ (12.7) ½ (12.7) ½ (12.7) Liquid Subcooling Integral Integral
Integral Integral Integral Integral EVAPORATOR Number 1 1 1 1 1 1
No. Refrigerant Circuits 2 2 2 2 2 2 Water Volume, gallons, (l) 3.9
(14.7) 4.3 (16.4) 5 (18.9) 5.7 (21.4) 6.3 (23.9) 7.2 (27.3) 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) 363 (2503) 363
(2503) 363 (2503) 363 (2503) 363 (2503) 363 (2503) Water
Connections: Inlet & Outlet, in., (mm) Victaulic 3 (76) 3 (76)
3 (76) 3 (76) 3 (76) 3 (76) Drain & Vent (NPT INT.) Field Field
Field Field Field Field UNIT DIMENSIONS Length In., (mm) 134.1
(3406) 134.1 (3406) 134.1 (3406) 134.1 (3406) 134.1 (3406) 134.1
(3406)Width In., (mm) 32 (813) 32 (813) 32 (813) 32 (813) 32 (813)
32 (813) Height In., (mm) 63.5 (1613) 63.5 (1613) 63.5 (1613) 63.5
(1613) 63.5 (1613) 63.5 (1613) UNIT WEIGHTS Operating Weight, lb.,
(kg) 2691 (1223) 2760 (1252) 2864 (1299) 2966 (1345) 3058 (1387)
3213 (1457)Shipping Weight, lb., (kg) 2641 (1198) 2696 (1223) 2772
(1257) 2853 (1294) 2918 (1324) 3063 (1389)Cir # 1,Opn. Charge, lb.,
(kg) R-22 50 (599) 50 (22.5) 47 (21.3) 46 (20.8) 44 (20.0) 45
(20.2) Cir # 2,Opn. Charge, lb., (kg) R-22 50 (599) 50 (22.5) 47
(21.3) 46 (20.8) 44 (20.0) 45 (20.2)
Notes: 1. Certified in accordance with ARI Standard 550/590-98.
2. All units have two parallel compressors per circuit. 3. 80% Full
R-22 at 90°F (32°C) per unit.
-
28 WGZ 030A through 100A IMM WGZ-2
Table 10, WGZ-060AW - WGZ-100AW WGZ UNIT SIZE 060 070 080 090
100 Unit capacity @ ARI conditions tons, (kW) (1) 59.6 (209) 68.0
(239) 78.0 (274) 84.4 (297) 93.7 (330)
No. Circuits 2 2 2 2 2 COMPRESSORS (2) Nominal Tons 15 15 15 20
20 20 20 25 25 25 Number (2) 2 2 2 2 2 2 2 2 2 2 Unloading Steps, %
25 / 50 / 75 28 / 50 / 78 25 / 50 / 75 27 / 50 / 77 25 / 50 / 75
Oil Charge, per compressor oz. (l) 140 (4.1) 140 (4.1) 148 (4.3)
148 (4.3) 200 (5.9) 200 (5.9 200 (5.9CONDENSER Number 1 1 1 1 1 No.
Refrigerant Circuits 2 2 2 2 2 Diameter, in. (mm) 14 (356) 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 450 (3102) 450 (3102) 450 (3102) 450 (3102) 450
(3102) 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) 481
(218.2) 462 (209.6) 449 (203.7) 429 (194.6) 409 (185.5)
Water Connections, Victaulic: Water In & Out, in., (mm) (4)
5 (127) 5 (127) 5 (127) 5 (127) 5 (127) Relief Valve, Flare in.,
(mm) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7) 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 ½ (12.7) ½ (12.7) ½ (12.7) ½ (12.7) ½
(12.7) Liquid Subcooling Integral Integral Integral Integral
Integral EVAPORATOR Number 1 1 1 1 1 No. Refrigerant Circuits 2 2 2
2 2 Water Volume, gallons (l) 8.1 (30.7) 9.2 (34.9) 10.8 (40.7)
12.8 (48.3) 13.9 (52.5) Refrigerant Side D.W.P., psig, (kPa) 450
(3102) 450 (3102) 450 (3102) 450 (3102) 450 (3102)
Water Side D.W.P., psig, (kPa) 363 (2503) 363 (2503) 363 (2503)
363 (2503) 363 (2503) Water Connections, Victaulic: In & Out,
in. (mm) 3 (76) 3 (76) 3 (76) 3 (76) 3 (76) Drain & Vent, Field
Field Field Field Field UNIT DIMENSIONS Length, in. (mm) 144.2
(3663) 146.7 (3726) 146.7 (3726) 149 (3784) 149 (3784) Width, in.
(mm) 32 (813) 32 (813) 32 (813) 32 (813) 32 (813) Height, in. (mm)
66 (1676) 66 (1676) 66 (1676) 66 (1676) 66 (1676) UNIT WEIGHTS
Operating Wt, lb., (kg) 3809 (1728) 4025 (1826) 4289 (1945) 4478
(2031) 4627 (2099) Shipping Wt, lb. (kg) 3590 (1628) 3806 (1726)
4037 (1831) 4178 (1895) 4287 (1945) Cir # 1,Opn. Charge, lb.,(kg)
R-22 87 (39.3) 84 (37.9) 82 (37.0) 76 (34.3) 76 (34.3) Cir # 2,Opn.
Charge, lb.,(kg) R-22 87 (39.3) 84 (37.9) 82 (37.0) 76 (34.3) 76
(34.3)
Notes: 1. Certified in accordance with ARI Standard 550/590-98.
2. All units have two parallel compressors per circuit. 3. 80% Full
R-22 at 90°F (32°C) per unit.
-
IMM WGZ-2 WGZ 030A through 120A 29
Table 11, WGZ 110 AW - 120 AW WGZ UNIT SIZE 110 120 Unit
capacity @ ARI conditions tons, (kW) (1) 106.2 (373) 117.2
(411)
No. Circuits 2 2 COMPRESSORS (2) Nominal Tons 25 30 30 30 Number
(2) 2 2 2 2 Unloading Steps 27 / 50 / 77 25 / 50 / 75 Oil Charge,
per compressor oz. (l) 200 (5.9 200 (5.9 200 (5.9 200
(5.9)CONDENSER Number 1 1 No. Refrigerant Circuits 2 2 Diameter,
in. (mm) 14 (356) 14 (356) Tube Length, in. (mm) 120 (3048) 120
(3048) Design W.P., psig (kPa): Refrigerant Side 450 (3102) 450
(3102) Water Side 232 (1599) 232 (1599) No. of Passes 2 2 Pump-Out
Capacity lb., (kg) (3) 409 (185.5) 409 (185.5)
Water Connections, Victaulic: Water In & Out, in., (mm) (4)
5 (127) 5 (127) Relief Valve, Flare in., (mm) ½ (12.7) ½ (12.7)
Purge Valve, Flare in. (mm) ½ (12.7) ½ (12.7) Vent & Drain, in.
(mm) FPT ½ (12.7) ½ (12.7) Liquid Subcooling Integral Integral
EVAPORATOR Number 1 1 No. Refrigerant Circuits 2 2 Water Volume,
gallons (l) 13.9 (52.5) 13.9 (52.5) Refrigerant Side D.W.P., psig,
(kPa) 450 (3102) 450 (3102)
Water Side D.W.P., psig, (kPa) 363 (2503) 363 (2503) Water
Connections, Victaulic: In & Out, in. (mm) 3 (76) 3 (76) Drain
& Vent, Field Field UNIT DIMENSIONS Length, in. (mm) 149 (3785)
149 (3785) Width, in. (mm) 32 (813) 32 (813) Height, in. (mm) 66
(1677) 66 (1677) UNIT WEIGHTS Operating Wt, lb., (kg) 4828 (2190)
5010 (2273) Shipping Wt, lb. (kg) 4488 (2036) 4670 (2118) Cir
#1,Opn. Charge, lb., (kg) R-22 85 (39) 85 (39) Cir #2,Opn. Charge,
lb., (kg) R-22 85 (39) 85 (39)
Notes: 1. Certified in accordance with ARI Standard 550/590-98.
2. All units have two parallel compressors per circuit. 3. 80% Full
R-22 at 90°F (32°C) per unit.
-
30 WGZ 030A through 100A IMM WGZ-2
AA Remote Condenser Table 12, WGZ-030AA - WGZ-055AA WGZ UNIT
SIZE 030 035 040 045 050 055 Cap @ 44°F LWT , 125°F SDT tons,
(kW)
29 (103) 31.6 (112) 36.6 (130) 40.7 (144) 44.7 (158) 49.8
(177)
No. Circuits 2 2 2 2 2 2 COMPRESSORS Nominal Tons 7.5 9 9 9 10
10 13 10 13 13 13 15 Number (Note 1) 2 2 2 2 2 2 2 2 2 2 2 2
Unloading Steps, % 27 / 50 / 77 25 / 50 / 75 25 / 50 / 75 28 / 50 /
78 25 / 50 / 75 27 / 50 / 77 Oil Charge, per compressor oz, (l) 140
(4.1) 140 (4.1) 140 (4.1) 140 (4.1) 140 (4.1) 140 (4.1)
Discharge Valve In., (mm) 1.125 (28) 1.125 (28) 1.125 (28) 1.125
(28) 1.125 (28) 1.125 (28) 1.375 (35) EVAPORATOR No. Refrigerant
Circuits 2 2 2 2 2 2 Water Volume, gallons, (l) 3.9 (14.7) 4.3
(16.4) 5 (18.9) 5.7 (21.4) 6.3 (23.9) 7.2 (27.3) 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) 363 (2503) 363
(2503) 363 (2503) 363 (2503) 363 (2503) 363 (2503) Water
Connections, Victaulic: Inlet & Outlet, in., (mm) (1) 3 (76) 3
(76) 3 (76) 3 (76) 3 (76) 3 (76) Drain & Vent Field Field Field
Field Field Field UNIT DIMENSIONS Length In., (mm) 122.4 (3109)
122.4 (3109) 122.4 (3109) 122.4 (3109) 122.4 (3109) 123.4 (3134)
Width In., (mm) 32 (813) 32 (813) 32 (813) 32 (813) 32 (813) 32
(813) Height In., (mm) 63.5 (1613) 63.5 (1613) 63.5 (1613) 63.5
(1613) 63.5 (1613) 63.5 (1613) UNIT WEIGHTS Operating Weight, lb.,
(kg) 2169 (983) 2211 (1002) 2263 (1025) 2335 (1058) 2376 (1076)
2510 (1137) Shipping Weight, lb., (kg) 2248 (1018) 2285 (1035) 2331
(1056) 2392 (1084) 2424 (1098) 2558 (1159) Holding Charge, lb.,
(kg) R-22 Per Circuit 6.0 (2.7) 6.1 (2.8) 6.4 (2.9) 6.6 (3) 7.0
(3.2) 9.7 (4.4)
Table 13, WGZ-060AA - WGZ-100AA WGZ UNIT SIZE 060 070 080 090
100 Cap @ 44°F LWT , 125°F SDT tons, (kW) 54.9 (195) 62.1 (220)
73.0 (256) 80.0 (281) 87.5 (307)
No. Circuits 2 2 2 2 2 COMPRESSORS Nominal Horsepower 15 15 15
20 20 20 20 25 25 25 Number (3) 2 2 2 2 2 2 2 2 2 2 Unloading
Steps, % 25 / 50 / 75 28 / 50 / 78 25 / 50 / 75 27 / 50 / 77 25 /
50 / 75 Oil Charge oz 140 (4.1) 140 (4.1) 148 (4.3) 148 (4.3) 148
(4.3) 148 (4.3) 200 (5.9) 200 (5.9) 200 (5.9)EVAPORATOR No.
Refrigerant Circuits 2 2 2 2 2 Water Volume, gallons (l) 8.1 (30.7
9.2 (34.9) 10.8 (40.7) 12.8 (48.3) 13.9 (52.5) Refrigerant Side
D.W.P., psig, (kPa) 450 (3102) 450 (3102) 450 (3102) 450 (3102) 450
(3102)
Water Side D.W.P., psig, (kPa) 363 (2503) 363 (2503) 363 (2503)
363 (2503) 363 (2503)
Water Connections: Inlet & Outlet, in. (mm) (2) 3 (76) 3
(76) 3 (76) 3 (76) 3 (76) Drain & Vent Field Field Field Field
Field UNIT DIMENSIONS Length, in. (mm) 140 (3556) 142.5 (3620)
142.5 (3620) 144.75 (3677) 144.75 (3677) Width, in. (mm) 32 (813)
32 (813) 32 (813) 32 (813) 32 (813) Height, in. (mm) 66 (1676) 66
(1676) 66 (1676) 66 (1676) 66 (1676) UNIT WEIGHTS Operating Wt,
lb., (kg) 2784 (1261) 2953 (1338) 3164 (1433) 3280 (1486) 3345
(1515) Shipping Wt, lb. (kg) 2833 (1283) 3001 (1359) 3198 (1449)
3295 (1493) 3238 (1468) Holding Charge, lb. (kg) R-22 10.0 (4.5)
10.5 (4.7) 11.1 (5) 11.8 (5.4) 12.3 (5.6) Notes:
1. All units have two compressors per circuit in parallel. 2.
Condenser and field piping not included
-
IMM WGZ-2 WGZ 030A through 120A 31
Table 14, WGZ-100AA – WGZ-120AA WGZ UNIT SIZE 110 120 Cap @ 44°F
LWT , 125°F SDT tons, (kW) 99.1 (348) 109.2 (384)
No. Circuits 2 2 COMPRESSORS Nominal Horsepower 25 30 30 30
Number (3) 2 2 2 2 Unloading Steps, % 27 / 50 / 77 25 / 50 / 75 Oil
Charge oz 200 (5.9) 200 (5.9) 200 (5.9) 200 (5.9)EVAPORATOR No.
Refrigerant Circuits 2 2 Water Volume, gallons (l) 13.9 (52.5) 13.9
(52.5) Refrigerant Side D.W.P., psig, (kPa) 450 (3102) 450
(3102)
Water Side D.W.P., psig, (kPa) 363 (2503) 363 (2503)
Water Connections: Inlet & Outlet, in. (mm) (2) 3 (76) 3
(76) Drain & Vent Field Field UNIT DIMENSIONS Length, in. (mm)
144.8 (3677) 144.8 (3677) Width, in. (mm) 32 (813) 32 (813) Height,
in. (mm) 66 (1676) 66 (1676) UNIT WEIGHTS Operating Wt, lb., (kg)
3345 (1515) 3405 (1544) Shipping Wt, lb. (kg) 3238 (1468) 3298
(1495) Cir #1 Hldg Chg, lb. (kg) R-22Per Circuit 15 (6.8) 15
(6.8)
Notes: 1. Victaulic 2. Condenser and field piping not included
3. All units have two compressors per circuit in parallel.
Operating Limits • Maximum allowable condenser water pressure is
232 psig (1599 kPa). • Maximum allowable cooler water pressure is
363 psig (2509 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 30 degrees F and the saturated discharge
temperature cannot exceed 125°F.
-
32 WGZ 030A through 100A IMM WGZ-2
Components Figure 19, Compressor Locations
4 2 3 1
Circuit 2 Circuit 1 Control Panel
EvaporatorEvaporator andCondenserConnections
Table 15, Major Components System #1 System #2 Expansion Valve
Unit
Size Comp. #1 Comp. #3 Comp. #2 Comp. #4
Evap. Vessel
Size
Cond. Vessel
Size System #1 System #2
030 ZR90K3 ZR90K3 ZR11M3 ZR11M3 AC250-70DQ C1010-046
OVE-20-CP100 OVE-20-CP100035 ZR11M3 ZR11M3 ZR11M3 ZR11M3 AC250-78DQ
C1010-046 OVE-20-CP100 OVE-20-CP100040 ZR12M3 ZR12M3 ZR12M3 ZR12M3
AC250-90DQ C1010-058 OVE-20-CP100 OVE-20-CP100045 ZR12M3 ZR12M3
ZR16M3 ZR16M3 AC250-102DQ C1010-058 OVE-30-CP100 OVE-30-CP100050
ZR16M3 ZR16M3 ZR16M3 ZR16M3 AC250-114DQ C1010-070 OVE-30-CP100
OVE-30-CP100055 ZR16M3 ZR16M3 ZR19M3 ZR19M3 AC250-130DQ C1010-070
OVE-30-CP100 Y929-VCP100 060 ZR19M3 ZR19M3 ZR19M3 ZR19M3
AC250-146DQ C1410-078 Y929-VCP100 Y929-VCP100 070 ZR19M3 ZR19M3
ZR250KC ZR250KC AC250-166DQ C1410-090 OVE-40-CP100 OVE-40-CP100080
ZR250KC ZR250KC ZR250KC ZR250KC AC250-194DQ C1410-098 OVE-40-CP100
OVE-40-CP100090 ZR250KC ZR250KC ZR300KC ZR300KC AC250-230DQ
C1410-110 OVE-55-CP100 OVE-55-CP100100 ZR300KC ZR300KC ZR300KC
ZR300KC AC250-250DQ C1410-122 OVE-55-CP100 OVE-55-CP100110 ZR300KC
ZR300KC ZR380KC ZR380KC AC250-250DQ C1410-122 OVE-55-CP100
OVE-70-CP100120 ZR380KC ZR380KC ZR380KC ZR380KC AC250-250DQ
C1410-122 OVE-70-CP100 OVE-70-CP100
-
IMM WGZ-2 WGZ 030A through 120A 33
Wiring Field Wiring, Power The WGZ “A” vintage chillers are
built standard with compressor contractors and power terminal
block, designed for single power supply to the unit. Optional power
connections include a non-fused disconnect switch mounted in the
control box or multi-point power connection.
A factory installed control circuit transformer is standard.
Optionally, a field-installed control power source can be wired to
the unit.
Circuit breakers for backup compressor short circuit protection
are standard on all units.
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
35) give specific information on recommended wire sizes.
Unit power inlet wiring must enter the control box (right side)
through a patch plate provided for field terminating conduit.
(Refer to control panel dimension drawings for general location of
power inlet and components.)
NOTE: Use only copper conductors in main terminal block.
Terminations are sized for copper only.
Field Wiring, Control A factory-mounted control transformer is
provided to supply the correct control circuit voltage.
The transformer power leads are connected to the power block PB1
or disconnect switch DS1.
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.
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.
-
34 WGZ 030A through 100A IMM WGZ-2
Unit Configuration
The chiller unit has 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.
Figure 20, Schematic Piping Diagram (One of Two Circuits)
Comp#2
Comp#1
Condenser CondenserWater
EvaporatorChilledWater
S
F-D
T
S S
CV
SP
P1
LWT
T
T
Legend:
Temperature Sensor
Pressure Transducer
Pressure (High Pressure Cutout)
Temperataure Sensor, LeavingChilled Water Control
TT
TP
P1
LWT
Relief Valve
Schrader Fitting
Thermal Expansion Valve
Sight Glass / Moisture Indicator
Charging Valve
TS
CV
SSolenoid Valve
F-D Filter-Drier
Angle Valve
Ball Valve
-
IMM WGZ-2 WGZ 030A through 120A 35
Electrical Data
Table 16, Compressor Amp Draw, WGZ 030 - WGZ 120 Standard With
External OL's Locked Rotor Amps
Rated Load Amps Rated Load Amps Across-The-Line Per Compressor
Per Compressor Per Compressor
( 2 Compr./Circuit) ( 2 Compr./Circuit) ( 2 Compr./Circuit)
WGZ Unit Size
Voltage Freq. (Hertz)
Circuit 1 Circuit 2 Circuit 1 Circuit 2 Circuit 1 Circuit 2 208
23.7 29.9 23.2 26.4 189 232 230 23.7 29.9 21.6 24.0 189 232 460
12.5 15.3 11.2 12.0 99 125
030
575
60
9.1 11.6 8.8 9.6 74 100 208 29.9 29.9 26.4 26.4 232 232 230 29.9
29.9 24.0 24.0 232 232 460 15.3 15.3 12.0 12.0 125 125 035
575
60
11.6 11.6 9.6 9.6 100 100 208 33.6 33.6 29.6 29.6 278 278 230
33.6 33.6 27.2 27.2 278 278 460 16.5 16.5 13.6 13.6 127 127 040
575
60
13.7 13.7 11.2 11.2 100 100 208 33.6 41.0 29.6 34.4 278 350 230
33.6 41.0 27.2 31.2 278 350 460 16.5 21.8 13.6 15.2 127 158 045
575
60
13.7 17.3 11.2 12.8 100 125 208 41.0 41.0 34.4 34.4 350 350 230
41.0 41.0 31.2 31.2 350 350 460 21.8 21.8 15.2 15.2 158 158 050
575
60
17.3 17.3 12.8 12.8 125 125 208 41.0 48.1 34.4 40.8 350 425 230
41.0 48.1 31.2 36.8 350 425 460 21.8 23.7 15.2 18.4 158 187 055
575
60
17.3 21.2 12.8 15.2 125 148 208 48.1 48.1 40.8 40.8 425 425 230
48.1 48.1 36.8 36.8 425 425 460 23.7 23.7 18.4 18.4 187 187 060
575
60
21.2 21.2 15.2 15.2 148 148 208 48.1 73.1 40.8 56.8 425 505 230
48.1 73.1 36.8 51.2 425 505 460 23.7 30.1 18.4 24.0 187 225 070
575
60
21.2 24.4 15.2 148 180 208 73.1 73.1 56.8 56.8 505 505 230 73.1
73.1 51.2 51.2 505 505 460 30.1 30.1 24.0 24.0 225 225 080
575
60
24.4 24.4 19.2 19.2 180 180 208 73.1 78.9 56.8 63.2 505 500 230
73.1 78.9 51.2 57.6 505 500 460 30.1 38.5 24.0 28.8 225 250 090
575
60
24.4 30.8 19.2 23.2 180 198 208 78.9 78.9 63.2 63.2 500 500 230
78.9 78.9 57.6 57.6 500 500 460 38.5 38.5 28.8 28.8 250 250 100
575
60
30.8 30.8 23.2 23.2 198 198 208 78.9 100 63.2 80.8 500 640 230
78.9 100 57.6 72.8 500 640 460 38.5 48.7 28.8 36.8 250 310 110
575
60
30.8 39.0 23.2 29.6 198 248 208 100 100 80.8 80.8 640 640 230
100 100 72.8 72.8 640 640 460 48.7 48.7 36.8 36.8 310 310 120
575
60
39.0 39.0 29.6 29.6 248 248 NOTES: 1. Compressor RLA values are
for wire sizing purposes only and do not reflect normal operating
current draw. 2. External Overloads only available on Units with
Single Power Supply and Water Cooled Condensers
-
36 WGZ 030A through 100A IMM WGZ-2
Table 17, Wire Sizing Amps, WGZ 030 - WGZ 120 Minimum Circuit
Ampacity (MCA) (1)
Single Point Single Point Multiple Point Power Supply (2) Power
Supply (2) Power Supply (3)
WGZ Unit Size
Voltage Freq. (Hertz) Without Ext OL's With Ext OL's Circuit 1
Circuit 2
208 115 106 54 68 230 115 97 54 68 460 60 49 29 35
030
575
60
45 39 21 27 208 128 112 68 68 230 128 102 68 68 460 66 51 35
35
035
575
60
50 41 27 27 208 143 126 76 76 230 143 116 76 76 460 71 58 38
38
040
575
60
59 48 31 31 208 160 137 76 93 230 160 125 76 93 460 83 61 38
50
045
575
60
67 51 31 39 208 175 146 93 93 230 175 133 93 93 460 93 65 50
50
050
575
60
74 54 39 39 208 190 161 93 109 230 190 145 93 109 460 97 72 50
54
055
575
60
82 60 39 48 208 205 173 109 109 230 205 156 109 109 460 101 78
54 54
060
575
60
90 65 48 48 208 261 209 109 165 230 261 189 109 165 460 115 91
54 68
070
575
60
97 74 48 55 208 311 241 165 165 230 311 218 165 165 460 128 102
68 68
080
575
60
104 82 55 55 208 324 256 165 178 230 324 232 165 178 460 147 113
68 87
090
575
60
118 91 55 70 208 336 269 178 178 230 336 245 178 178 460 164 122
87 87
100
575
60
131 99 70 70 208 383 308 178 225 230 383 279 178 225 460 187 141
87 110
110
575
60
150 113 70 88 208 425 343 225 225 230 425 309 225 225 460 207
156 110 110
120
575
60
166 126 88 88 NOTES: 1. Unit wire sizing amps are equal to 125%
of the largest compressor-motor RLA plus 100% of RLA of all other
loads in the
circuit including control transformer. 2. Single point power
supply requires a single fused disconnect to supply electrical
power to the unit. 3. Multiple point power supply requires two
independent power circuits with separate fused disconnects. (Two
compressor
circuits, control circuit will be wired to Circuit #1 from the
factory)
-
IMM WGZ-2 WGZ 030A through 120A 37
Table 18, Fuse Sizing, WGZ 030 - WGZ 120 Recommended Fuse Size
(1) Maximum Fuse Size (2)
Single Point without OL’s
Single Point- with/OL's
Power Supply Power Supply
Multiple Point Power Supply
Multiple Point Power Supply
WGZ Unit Size
Voltage 3-Phase
Freq. (Hertz)
Total Unit Total Unit Cir. 1 Cir. 2
Single Point without OL’sPower Supply
Total Unit
Single Point-with OL's
Power Supply
Total Unit Cir. 1 Cir. 2
208 125 125 70 90 125 125 70 90 230 125 125 70 90 125 125 70 90
460 70 70 40 45 70 70 40 45
030
575
60
50 50 25 35 50 50 25 35 208 125 125 90 90 150 125 90 90 230 125
125 90 90 150 125 90 90 460 70 60 45 45 80 60 45 45
035
575
60
50 50 35 35 60 50 35 35 208 175 150 100 100 175 150 100 100 230
175 125 100 100 175 125 100 100 460 80 70 50 50 80 70 50 50
040
575
60
70 60 40 40 70 60 40 40 208 200 150 100 125 200 150 100 125 230
200 150 100 125 200 150 100 125 460 100 70 50 70 100 70 50 70
045
575
60
80 60 40 50 80 60 40 50 208 200 175 125 125 200 175 125 125 230
200 150 125 125 200 150 125 125 460 110 70 70 70 110 70 70 70
050
575
60
90 60 50 50 90 60 50 50 208 225 200 125 150 225 200 125 150 230
225 175 125 150 225 175 125 150 460 110 90 70 70 110 90 70 70
055
575
60
100 70 50 60 100 70 50 60 208 225 200 150 150 250 200 150 150
230 225 175 150 150 250 175 150 150 460 125 90 70 70 125 90 70
70
060
575
60
110 70 60 60 110 70 70 70 208 300 250 150 200 300 250 150 225
230 300 225 150 200 300 225 150 225 460 125 110 70 80 125 110 70
90
070
575
60
110 90 60 70 110 90 70 70 208 350 250 200 200 350 250 225 225
230 350 250 200 200 350 250 225 225 460 150 125 80 80 150 125 90
90
080
575
60
125 100 70 70 125 100 70 70 208 400 300 200 250 400 300 225 250
230 400 250 200 250 400 250 225 250 460 175 125 80 110 175 125 90
125
090
575
60
125 110 70 80 125 110 70 90 208 400 300 250 250 400 300 250 250
230 400 300 250 250 400 300 250 250 460 200 150 110 110 200 150 125
125
100
575
60
150 110 80 80 150 110 90 90 208 450 350.0 250 300 500 350.0 250
350 230 450 350.0 250 300 500 350.0 250 350 460 225 150.0 110
125