McQuay WGS160AW

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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:

L
lowejamesAug 22, 2025
What to do if motor overload relays or circuit breakers open in McQuay Chiller?
- R
  Ryan LeeAug 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.
K
Kristin RobinsonAug 25, 2025
What causes low discharge pressure in a McQuay WGS160AW?
- A
  Alicia SmithAug 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.
J
Jasmine ThomasAug 27, 2025
What should I do if my McQuay Chiller has low suction pressure?
- M
  Michael FigueroaAug 27, 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.
A
arthur63Aug 30, 2025
Why is my McQuay WGS160AW compressor noisy or vibrating?
- G
  George FoxAug 30, 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.
C
Chelsea WardSep 2, 2025
What causes little or no oil pressure in a McQuay Chiller?
- C
  Cody MiddletonSep 2, 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.
E
Elizabeth HartSep 5, 2025
Why is the suction pressure high in my McQuay WGS160AW?
- K
  kevin74Sep 5, 2025
  If your McQuay Chiller is experiencing high suction pressure, consider the following: * Reduce the load or add additional equipment if there is an excessive load. * Check the remote bulb and regulate superheat if the expansion valve is overfeeding.
H
hmcgeeSep 7, 2025
Why does my McQuay WGS160AW Chiller compressor lose oil?
- T
  tuckerthomasSep 7, 2025
  If the compressor in your McQuay Chiller is losing oil, here are a few things to check: * Check for leaks and repair them. Add refrigerant if there is a lack of refrigerant. * Check riser sizes if the velocity in risers is too low (for A-C models only). * Check the pitch of lines and refrigerant velocities to identify oil trapped in the line.
A
Amy McmahonSep 10, 2025
What to do if freeze protection opens in McQuay WGS160AW?
- H
  Heather Ramirez MDSep 10, 2025
  If the freeze protection is opening on your McQuay Chiller, here's what to check: * Reset the thermostat to 42°F (6°C) or above if it's set too low. * Adjust the flow if there is low water flow. * Refer to the section on “Low Suction Pressure.”
V
vadamsSep 12, 2025
What causes the compressor thermal switch to open in a McQuay WGS160AW?
- K
  kevin73Sep 13, 2025
  If the compressor thermal switch is open on your McQuay Chiller, consider these potential causes: * Add facilities so that conditions are within allowable limits if operating beyond design conditions. * Open the valve if the discharge valve is partially shut.

McQuay WGS160AW Specifications

General

Brand	McQuay
Model	WGS160AW
Category	Chiller
Language	English

Summary

MicroTech II Controller Overview

System Architecture

PLAN Addressing

Sequence of Operation

Startup and Compressor Staging

Details on how compressors start, stage, load, and unload during operation.

Automatic Pumpdown

Explanation of the pumpdown process for refrigerant charge storage.

Pumps and Cooling Tower Control

Control logic for chilled water, condenser water pumps, and cooling towers.

Start-Up and Shutdown Procedures

Pre Start-up and Initial Start-up

Detailed steps for preparing and initially starting the chiller unit.

Shutdown and Restart Procedures

Unit Controller Functions

Enable, Mode, and Test Operations

Circuit Controller Functions

InputsOutputs and Setpoints

EXV, Sensor, and Starter Setpoints

Alarms and Events Management

Unit Alarms and Events

Description of unit stop alarms like Evaporator Flow Loss and Condenser Flow Loss.

Circuit Alarms and Events

Description of circuit-specific alarms like Low Evaporator Pressure and events.

BAS Interface and Troubleshooting

Unit Troubleshooting Chart

A guide to diagnosing and resolving common unit problems and issues.

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