Airwell AWAU-YHD009-H11, Service Manual

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CONTROL SYSTEM
SM HHD 1-A.1 GB 12-11
Model 09/12: Compressor will stop when AC current reaches 14.0A for continuously 2.5s.
Model 18/24: Compressor will stop when AC current reaches 17.0A for continuously 2.5s.
If the unit stops as such protection for 6 times, it can not resume running automatically and display
error Code E5 , it can resume by pressing ON/OFF.
During the operating, If compressor operates for more than 10min, the counter of stop operation
due to protection will be cleared.
12.13.6 Outdoor Coil Deicing Protection
This protection is for Heat Pump Only
This protection is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor
heat exchanger temperature must be more than its setting values when finishing the deicing
protection.
In the deicing protection, IFAN is forced OFF.
12.13.6.1 Deicing Starting Conditions
This protection is for Heat Pump Only
This protection is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor
heat exchanger temperature must be more than its setting values when finishing the deicing
protection.
In the deicing protection, IFAN is forced OFF.
12.13.6.2 Deicing Protection Procedure
Deicing Starting Conditions:
The starting conditions is a function of OAT and (OCT). Under the conditions that the system is in
heating operation for certain period (Accumulated time)
After the deicing starting condition is detected for continuous 3minutes, the de-icing will start.
Compressor, IFAN, OFAN and RV operate according to following chart during deicing.
For Model 09/12:
ON ON (Max. 7 min )
ON
ON
ON
ON
ON
ON
ON
Comp
OFAN
RV
IFAN
30s
15s
30s
60s
Anti cold air
Max 3min
Heating Deicing
Heating