Airwell ELECTRA AWAU-VDDE009-H11, Service Manual

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12-9
SM
JE
DE 1-A.1 GB
CONTROL SYSTEMS
12.11 Protections
There are 4 protection codes.
Normal (Norm)
– unit operate normally.
Stop Rise (SR)
– compressor frequency can not be raised but does not have to be decreased.
HzDown
– Compressor frequency is reduced by 2Hz/s
Stop Compressor (SC)
– Compressor is stopped.
12.11.1 Indoor Coil Defrost Protection
Conditions for Start Controlling
Judge the controlling start with the ICT (Indoor Coil Temperature) after 2 sec from operation start.
During cooling operation, the signals being sent from the indoor unit allow the operating frequency
limitation and then prevent freezing of the indoor heat exchanger.
Compressor will stop when ICT <= -1
o
C for continuous 3 mins.
If the unit stops as such protection for 6 times, it can not resume running automatically and display
error code E2 , 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.
12.11.2 Compressor over Heating Protection
The Discharging temperature is used as the co
mpressor’s internal temperature. If the discharge
temperature rises above a certain level, the operating frequency upper limit is set to keep this
temperature from going up further.
Model 09/12 : Compressor will stop when CTT >110C
Model 18/24 : Compressor will stop when CTT >115C
If the unit stops as such protection for 6 times, it can not resume running automatically and display
error Code E4 , it can be resumed 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.
12.11.3 Indoor Coil over Heating Protection (Heat Mode)
Conditions for Start Controlling
Judge the controlling start with the ICT after 2 sec from operation start.
During heating operation, the signals being sent from the indoor unit allow the operating frequency