Haier HCFU-18CF03 Service Manual page 63

setting wind speed.
(6) Afterheat blowing during heating program
During heating program, the compressor will stop running (except overheat protection or
frost removal) while the indoor blowing fan will firstly run for 50 seconds at low speed then
stop.
(7) Frost removal control (applicable for cooling-heating type)
Starting conditions for frost removal:
A The indoor unit is in overload protection and outdoor blowing fan stops. The outdoor
blowing fan does not enter overheat mode in 10 minutes after it is restarted, the
compressor has run over 45 minutes totally while 20 minutes continuously, and the
temperature of indoor coil pipe is lower than 43 ;
B After the compressor continuously running for 20 minutes, the temperature of indoor
coil pipe falls 1
and the temperature of indoor coil pipe is less than 40 , and 5 minutes have passed
after the compressor is restarted;
C The compressor has run totally over 3 hours while 20 minutes continuously, and the
temperature of indoor coil pipe is less than 40 ;
D The difference between room temperature and the one of indoor coil pipe is less than
16 and the compressor has totally run over 45 minutes while 20 minutes
continuously;
Frost removal will start if any one of the above conditions is satisfied.
Ending conditions for frost removal:
1 Time of frost removal has exceeded 9 minutes;
2 CT current exceeds I4(8.2A)
Actions of each load after the frost removal starts:
The compressor and outdoor blowing fan stop, and indoor blowing fan also stops.
55 seconds later the reversal valve is closed and next 5 seconds later the compressor is
started.
Actions of each load after the frost removal ends:
The compressor stops running while outdoor blowing fan immediately runs at high
speed, 55 seconds later the reversal valve is opened and next 5 seconds later the
compressor restores running and indoor blowing fan runs as conditions for cool wind
prevention.
(8) Freeze protection
After the compressor has run for 9 minutes, the system will check temperature of
indoor coil pipe (Ticp). If Ticp is less than -1 , the compressor and outdoor blowing
fan will stop. They will run again after the compressor stops if both the following
conditions are satisfied:
1) 3 minutes have passed since compressor stops.
2) Ticp exceeds 7 .
(9) 3 minutes protection for compressor
After compressor stops, it cannot be started until 3 minutes later. During the machine's
running, if time after loosing power not exceeds 3 minutes, the compressor cannot be
63
Commercial Air Conditioner
every 6 minutes and such case continuously appears three times,
Model: HCFU-18/28CF03
HCFU-18/28HF03