Operating Range; Service And Maintenance; Troubleshooting - McQuay CEX20E Installation Manual

1. Cooling Unit
Temperature
Min. indoor temp.
Max. indoor temp.
Min. outdoor temp.
Max. outdoor temp.
* Ts: Dry bulb temperature
Service Parts
Indoor air filter 1. Remove any dust adhering to the filter by using a vacuum cleaner or wash
in lukewarm water (below 40°C/104°F) with a neutral cleaning detergent.
2. Rinse the filter well and dry before placing it back onto the unit.
3. Do not use gasoline, volatile substances or chemicals to clean the filter.
Indoor unit
1. Clean any dirt or dust on the grille or panel by wiping it with a soft cloth
soaked in lukewarm water (below 40°C/104°F) and a neutral detergent
solution.
2. Do not use gasoline, volatile substances or chemicals to clean the
indoor unit.
If any malfunction of the air conditioner unit is noted, immediately switch off the power supply to the unit. Check the
following fault conditions and causes for some simple troubleshooting tips.
1. The compressor does not operate 3 minutes after the air
conditioner unit is started.
2. The air conditioner unit does not operate.
3. The air flow is too low.
4. Discharge air flow has bad odour.
5. Condensation on the front air grille of the indoor unit.
6. Water flowing out from the air conditioner unit.
7. Hissing air flow sound from the air conditioner unit during
operation.
*If the fault persists, please call your local dealer / serviceman.

OPERATING RANGE

Ts °C / °F Th °C / °F
19.4 / 66.9 13.9 / 57.0
26.7 / 80.1 19.4 / 66.9
19.4 / 66.9 13.9 / 57.0
46.0 / 114.8 24.0 / 75.2

SERVICE AND MAINTENANCE

Maintenance Procedures

TROUBLESHOOTING

Fault
2. Heat Pump Unit
Temperature
Min. indoor temp.
Max. indoor temp.
Min. outdoor temp.
Max. outdoor temp.
* Th: Wet bulb temperature
Causes / Action
• Protection against frequent starting. Wait for 3 to 4 minutes for the
compressor to start operating.
• Power failure, or the fuse needs to be replaced.
• The power plug is disconnected.
• It is possible that your delay timer has been set incorrectly.
• If the fault persist after all these verifications, please
contact the air conditioner unit installer.
• The air filter is dirty.
• The doors or windows are open.
• The air suction and discharge are clogged.
• The regulated temperature is not high enough.
• Odours may be caused by cigarettes, smoke particles, perfume etc.
which might have adhered onto the coil.
• This is caused by air humidity after an extended long period of
operation.
• The set temperature is too low, increase the temperature setting and
operate the unit at high fan speed.
• Switch off unit and call dealer.
• Refrigerant fluid flowing into the evaporator coil.
8
Ts °C / °F Th °C / °F
10.0 / 50.0 –
26.7 / 80.1 –
-8.0 / 17.6 -9.0 / 15.8
24.0 / 75.2 18.0 / 64.4
Period
At least once every 2 weeks.
More frequently if necessary.
At least once every 2 weeks.
More frequently if necessary.