McQuay WGS190AW User Manual

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Operating Manual

OM WGS-5

Group: Chiller

Part Number: 331373701

Effective: November 2008

Supersedes: OM WGS-4

Water-Cooled Screw Compressor Chillers

WGS 130AW to WGS 190AW, Packaged Water-Cooled Chiller

WGS 130AA to WGS 190AA, Chiller with Remote Condenser

120 to 200 Tons, 420 to 700 kW

R-134a, 60 Hz

Software Version WGSD30101H

Table of Contents

Questions and Answers:

S
Shari SchultzAug 22, 2025
What to do if motor overload relays or circuit breakers open in McQuay Chiller?
- P
  Phillip Graham MDAug 22, 2025
  If the motor overload relays or circuit breakers are open on your McQuay Chiller, consider these potential causes: * Check for low voltage during high load conditions, and examine the supply voltage for excessive line drop. * Inspect for defective or grounded wiring in the motor or power circuits. Replace the compressor-motor if necessary. * Ensure all power wiring connections are tight. * Address high condensing temperature by following corrective steps for high discharge pressure. * Check the supply voltage for a power line fault causing unbalanced voltage. Notify the power company and do not start the chiller until the fault is corrected. * Provide ventilation to reduce heat if there's a high ambient temperature around the overload relay.
A
Andrew ReynoldsAug 26, 2025
What causes low discharge pressure in a McQuay Chiller?
- S
  Stephanie MolinaAug 26, 2025
  If the McQuay Chiller has low discharge pressure, here are a few things to check: * Examine the condenser control operation for faulty temperature regulation. * Check for leaks and add refrigerant if there is insufficient refrigerant in the system. * Refer to the corrective steps for low suction pressure. * Compare the condenser rating table against the operation if the condenser is too large. * Check the condenser rating tables against the operation if there are low ambient conditions.
M
mariahadamsAug 28, 2025
What should I do if my McQuay WGS190AW Chiller has low suction pressure?
- D
  Danny SmithAug 28, 2025
  If your McQuay Chiller is experiencing low suction pressure, consider the following: * Check for refrigerant leaks and add refrigerant if necessary. * Clean the evaporator chemically if it's dirty. * Replace the cartridge(s) if the liquid line filter-drier is clogged. * Check and reset the expansion valve for proper superheat, replacing it if necessary. * Check the means for regulating condensing temperature if the condensing temperature is too low. * Refer to the corrective steps for failure of the compressor to unload. * Adjust the flow if there is insufficient water flow.
C
Christine SparksAug 30, 2025
Why is my McQuay WGS190AW Chiller compressor noisy or vibrating?
- M
  maria40Aug 31, 2025
  If your McQuay Chiller's compressor is noisy or vibrating, here's what you can check: * Examine the superheat setting of the expansion valve to prevent refrigerant flooding into the compressor. * Relocate, add, or remove hangers to ensure proper piping support on the suction or liquid line. * If the compressor is worn, consider replacing it.
B
Benjamin QuinnSep 2, 2025
What causes little or no oil pressure in a McQuay WGS190AW Chiller?
- S
  samuel28Sep 3, 2025
  If your McQuay Chiller shows little or no oil pressure, here's what to investigate: * Clean the suction oil strainer if it's clogged. * Check the sump heater, reset the expansion valve for higher superheat, and check the liquid line solenoid valve operation if there's excessive liquid in the crankcase. * Add oil if the oil level is low. * Adjust the expansion valve if there's flooding of refrigerant into the crankcase.

McQuay WGS190AW Specifications

General

Tonnage	190 tons
Refrigerant Type	R-134a
Compressor Type	Screw
Power Supply	460V/3Ph/60Hz
Length	5000 mm
Width	2000 mm

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