Troubleshooting; Phase Sequencer (Optional) - McQuay IM-CKA-0501 A Series Installation Manual

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 start operate after 3 minutes
from starting the air conditioner unit.
2. The air conditioner unit does not operate.
3. The air flow is too low.
4. Discharge air flow has bad odor.
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.
The unit with Scroll Compressor can only rotate in one direction. For this reason, a protective device (phase sequencer) is
fitted to prevent incorrect wiring of the electrical phases. When the three phases are not connected correctly, the phase
sequencer operates, and the unit will not start. This device is located in the control box of the outdoor unit.
The following table shows the LED indicator light for phase sequencer under normal operation and fault conditions.
LED
Description
Normal operation
Reverse phase
T phase missing
S phase missing
R phase missing
+
S &T phase missing
+
Overload
+
Sensor missing
ON
Notes : 1. "+" indicates additional functions for PP01 phase sequencer.
2. When R phase missing, no LED or buzzer will indicate the error, but relay 71 and relay 81 will cut off.
• Troubleshooting must be performed by qualified personnel.

TROUBLESHOOTING

Fault

PHASE SEQUENCER (OPTIONAL)

PW P_R P_S
(Red) (Yellow) (Yellow)
OFF
! Warning
- Protection against frequent starting. Wait for 3 to 4
minutes for the compressor to start operating.
- Power failure, or the fuse need 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.
- Odors 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.
P_T
(Yellow)
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
High discharge temperature. Check the refrigerant system.
Switch off the unit. Plug in sensor.
Fast Blink
1-16
Causes / Action
Actions
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