7
WATER PUMP
The water pump will on if compressor is on during cooling cycle. The pump will remain on for at least 5
minutes after the compressor is off.
During mode change from cooling to non-cooling mode, the pump will on for minimum 5 minutes. During
defrost cycle, the pump will on and will on for another 5 minutes once the defrost cycle is terminated.
WATER LEVEL SWITCH
This normally close switch is to detect faults in water pump system. It will confirm for 30 seconds for switch
open and 60 seconds for switch close.
Once switch is confirmed open, it will force compressor to cut off. If the switch is closed within 5 minutes,
the compressor is allowed to cut in. If the switch does not close for more than 5 minutes, the system will
warn user regarding the fault, the compressor is not allowed to cut in. If the switch is confirmed opened
twice within 30 minutes, the system assumes there are faults.
PHASE SEQUENCER
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 devise 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_P
(Red)
LED_R
(Yellow)
LED_S
(Yellow)
LED_T
(Yellow)
Normal Operation On - - -
Reverse Phase Blink Blink Blink Blink
S & T Phase Missing Blink - Blink Blink
T Phase Missing Blink - - Blink
S Phase Missing Blink - Blink -
R Phase Missing - - - -
Overload Blink - - -
Sensor Missing Blink On On On
Notes: 1. “-” means LED off.
2. When R phase missing, no LED or buzzer will indicate the error, but relay 71 (Common) and 81 (NO)
will cut off.
3. The unit will check the discharge sensor availability only during power up.
4. All errors can only recover through manual reset.
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