be turned off until the outdoor defrosting lasts more than 2 minutes.
When the double units are activated for defrosting, the activation of compressor B is 20
minutes later than that of compressor A.
Conditions for ending defrosting: It will restore to the heating operation from the defrosting
operation as long as any of the following conditions is met.
(1) . The temperatures on both outdoor heat exchangers are above 7 degrees for consecutive
80 seconds.
(2) . The temperatures on both outdoor heat exchangers are above 5 degrees for consecutive
12 seconds.
(3) . The defrosting operation has lasted 9 minutes.
The starting conditions and control process for the double-unit are same as that for single-unit
defrosting, the only difference is that the activation of compressor B lags that of compressor A.
11. Alarming operation
1. When the whole unit is in normal operation, the alarm light is always on, but does not
flash.
2. When the outdoor temperature sensor short-circuited or disconnected, the outdoor fan
always operates at the medium speed and will restore automatically after the sensor
comes to normal.
3. When the temperature sensor short-circuited or disconnected or the current transformer
fails, the alarm light flashes in the following manner; when the current transformer fails,
the signal is sent to the indoor unit that operates abnormally, and the corresponding
indoor unit indicates trouble:
Additional codes for overcurrent
LED light flashes once outdoor Eeprom in trouble
LED light flashes twice outdoor ambient temperature sensor in trouble
LED light flashes 3 times communication with indoor unit A in trouble
LED light flashes 5 times outdoor unit A’s coil in trouble
LED light flashes 6 times outdoor unit A’s CT current too high
LED light flashes 7 times communication with indoor unit B in trouble
LED light flashes 9 times outdoor unit B’s coil in trouble
LED light flashes 10 times outdoor unit B’s CT current too high
Domestic Air Conditioner
Model: H2SM-14HC03/R2
H2SM-18HC03/R2
35
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