McQuay WGS190AW - User Manual

Questions and Answers

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Shari SchultzAug 22, 2025
What to do if motor overload relays or circuit breakers open in McQuay Chiller?
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  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.
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Andrew ReynoldsAug 26, 2025
What causes low discharge pressure in a McQuay Chiller?
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  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.
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mariahadamsAug 28, 2025
What should I do if my McQuay WGS190AW Chiller has low suction pressure?
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  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.
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Christine SparksAug 30, 2025
Why is my McQuay WGS190AW Chiller compressor noisy or vibrating?
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  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.
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Benjamin QuinnSep 2, 2025
What causes little or no oil pressure in a McQuay WGS190AW Chiller?
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  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.
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Pamela BraySep 5, 2025
Why is the suction pressure high in my McQuay Chiller?
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  Caroline HillSep 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.
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David SmithSep 8, 2025
Why does my McQuay WGS190AW compressor lose oil?
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  Elizabeth FowlerSep 8, 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.
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Kim LaneSep 12, 2025
What to do if freeze protection opens in McQuay WGS190AW?
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  Christine VillarrealSep 12, 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.”
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Jorge NguyenSep 13, 2025
What causes the compressor thermal switch to open in a McQuay Chiller?
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  Melissa HollandSep 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.
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beth62Nov 16, 2025
How to troubleshoot a McQuay WGS190AW Chiller compressor that will not run?
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  Ronald DavisNov 16, 2025
  If the McQuay Chiller compressor won't start, here's what to check: * Ensure the main switch and circuit breakers are closed. Close the switch if it's open. * Inspect for blown fuses. Look for electrical shorts or grounds in the circuits and motor winding, and address any overloading issues. Replace the fuse or reset the breakers after fixing the fault. * Check if thermal overloads have tripped. These are auto-reset, so monitor the unit when it restarts. * Examine the contactor or coil for defects and repair or replace if necessary. * Determine if equipment protection devices have shut down the system. Identify the cause and correct it before resetting the protection switch. * If no cooling is required, wait for the unit to call for cooling. * If the liquid line solenoid won...