McQuay MAC060D4 - User Manual

McQuay MAC060D4

30 pages

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Air Cooled Chiller

Models:

MAC060/090/120D4

Contents

INSTALLATION, OPERATION & MAINTENANCE MANUAL

Questions and Answers

K
knappfrankNov 25, 2025
How to fix communication problem between thermostat and PCB in McQuay Chiller?
- T
  Tiffany PrinceNov 25, 2025
  A communication problem between the thermostat and PCB in your McQuay Chiller can arise from several factors. The communication cable might be connected A/B oppositely, or it could be loose. Interference can also occur if the communication cable and power cable are crossed. Other potential issues include the PCB not being powered on, excessive communication distance, a PCB communication port failure, a thermostat communication port failure, or an incorrect address setting. To troubleshoot: 1. Check the communication cable connection. 2. Re-do the wiring to avoid the power cable and communication cable being close, and use shielded twisted cable. 3. Check the PCB. 4. Use shielded twisted cable and shorten JP7 on the PCB if the communication distance is too long. 5. Check by monitorin...
V
Vernon SalazarAug 23, 2025
What to do if my McQuay Chiller shows a high pressure malfunction?
- P
  Pamela DavisAug 23, 2025
  A high-pressure malfunction in your McQuay Chiller can stem from several issues. The motor could be damaged, there might be a short circuit in the air circulation, or the heat exchanger could be dirty. Other potential causes include a dirty refrigerant side filter, excessively high ambient temperature, or too much refrigerant charge. It could also be due to a PCB high-pressure output failure or a voltage switch failure. To resolve this, try the following: * Change the motor. * Improve condenser air circulation. * Clean the condenser. * Check and replace the refrigerant side filter. * Power off the system if the ambient temperature is too high. * Discharge some refrigerant. * Change the PCB or pressure switch if those are the cause.
M
Melinda TylerAug 25, 2025
What causes a low pressure malfunction in McQuay Chiller?
- C
  cherylwongAug 25, 2025
  A low-pressure malfunction in your McQuay Chiller may be due to a leakage or lack of refrigerant. Check for any leaks and recharge the system. It could also be caused by a PCB low-pressure output failure, in which case you should replace the PCB. Another possible cause is a faulty low-pressure sensor; if this is the case, replace the pressure sensor switch.
L
Lisa WrightAug 27, 2025
Why is the discharge temperature too high on my McQuay MAC060D4?
- C
  christinascottAug 27, 2025
  If the discharge temperature is too high in your McQuay Chiller, it could be due to motor failure, return air short circuit, or a dirty condenser. Also, it can happen if the EWT is too high, or there is a lack of refrigerant or leakage. To solve this, change the fan motor, improve terminal equipment air circulation, and clean the condenser. If the EWT is too high, reset it by service personnel. If there is a lack of refrigerant or leakage, charge refrigerant.
A
Alan GordonAug 29, 2025
What causes a pump overload in McQuay MAC060D4 Chiller?
- P
  pchavezAug 29, 2025
  If your McQuay Chiller's pump is overloading, it's possible the pump running current is too high, causing the overload protection to activate. Verify the pump current overload setting is correct according to the wiring diagram. Also, check if the pump resistance is normal.
A
Anthony ButlerSep 23, 2025
What does TH12 failure mean on McQuay MAC060D4?
- T
  Thomas WalkerSep 23, 2025
  A TH12 failure in your McQuay Chiller may indicate a suction temperature sensor disconnect or short circuit. Check the TH12 resistance and replace if necessary. It could also be due to a PCB failure, requiring you to change the PCB.
D
Donna DavisSep 16, 2025
What does TH8 failure mean on McQuay Chiller?
- T
  Tammie FordSep 16, 2025
  A TH8 failure in your McQuay Chiller could be caused by an ambient temperature sensor disconnect or short circuit. Check the TH8 resistance and replace the sensor if needed. It could also be a PCB failure, requiring you to change the PCB.
N
Norma KingSep 18, 2025
What does TH10 failure mean on McQuay MAC060D4 Chiller?
- A
  andrewmedinaSep 18, 2025
  A TH10 failure in your McQuay Chiller could be due to a condenser outlet temperature disconnect or short circuit. Check the TH10 resistance and replace if necessary. It might also indicate a PCB failure, in which case you should change the PCB.
N
Nathaniel RoseSep 8, 2025
What does TH1 failure mean on McQuay Chiller?
- R
  ryan93Sep 8, 2025
  A TH1 failure in your McQuay Chiller might indicate a Comp.1 discharge temperature sensor disconnect. Check the TH1 resistance and replace if necessary. It could also be due to a PCB failure, requiring you to change the PCB.
R
robertchaseSep 5, 2025
What to do if McQuay MAC060D4 over heats lower than 2 for 5 minutes?
- T
  tara53Sep 5, 2025
  If your McQuay Chiller overheats and remains lower than 2 for 5 minutes, it could be due to a broken low pressure/temperature sensor, requiring a replacement. Another potential cause is EXV failure, which also requires replacing the EXV.

McQuay MAC060D4 Specifications

General

Brand	McQuay
Model	MAC060D4
Category	Chiller
Language	English

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