McQuay GZ 035AM User Manual (English)

Questions and Answers:

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Theresa FosterAug 19, 2025
What to do if McQuay GZ 035AM Chiller compressor overloads or circuit breakers open?
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  uhornAug 19, 2025
  If the compressor overloads or circuit breakers open in your McQuay Chiller, it could be due to several reasons: * Low line voltage: Check the incoming voltage and report any issues to your electrical supplier. * High compressor amps: Identify the cause of the high amperage and correct it. * Loose power wiring: Tighten all connections. * High condenser pressures: Refer to the troubleshooting steps for high condenser pressure. * Single phasing: Replace the fuses or breaker.
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bradleysmithAug 22, 2025
Why is the discharge pressure high in my McQuay GZ 035AM Chiller?
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  Daniel AcostaAug 22, 2025
  High discharge pressure in your McQuay Chiller can stem from several factors: * Dirty condenser coils: Clean the coils. * Fan not operating: Check the fan motor, contactor, contactor coil, and fan pressure switch. Repair or replace any defective parts. * High ambient conditions: Compare the current conditions against the design conditions. * High return water temperature: Disable a compressor on each. * Overcharge of refrigerant: Remove the excessive amount of refrigerant. * Non-condensables in the system: Remove any non-condensable substances. * Discharge valve partially closed: Back seat the valve.
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John BarkerAug 25, 2025
How to fix low suction pressure in McQuay GZ 035AM?
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  debrajohnsAug 26, 2025
  Low suction pressure in your McQuay Chiller can be caused by: * Low refrigerant charge: Add refrigerant. * Defective expansion valve: Check its operation and repair or replace if needed. * Dirty filter drier: Replace the cores. * Reduced water flow: Increase water flow to the design GPM. * Hot gas bypass valve not set properly: Set the valve for a higher pressure. * Liquid line solenoid valve not opening: Repair or replace the valve. * Defective UNT controller: Check the water sensor, set point dial, and control band dial. Calibrate, repair, or replace the controller. * Gasket failure in evap head ring: Replace the gasket.
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Stephanie ChristensenAug 28, 2025
What causes high suction pressure in a McQuay GZ 035AM?
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  ethan21Aug 28, 2025
  High suction pressure in a McQuay Chiller can be attributed to: * Excessive load (high return water temperature): Check water flow and reduce the load. * Controller not staging up: Check the UNT controller and replace it if defective. * Compressor capacity reduced: Replace the compressor. * Association with high condenser pressure: Check the reasons for high condenser pressure.
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Cameron PatrickAug 31, 2025
Why is the discharge pressure low on my McQuay GZ 035AM Chiller?

McQuay GZ 035AM Specifications

General

Model	GZ 035AM
Category	Chiller
Cooling Capacity	35 kW
Refrigerant Type	R410A
Sound Pressure Level	65 dB(A)
Dimensions (LxWxH)	1200 x 800 x 1200 mm
Power Supply	380-415V/3Ph/50Hz