Haier HBU-18CF03 Service Manual page 69

9.2 Defrost operation flow chart
Condition
for
or
compress
OFF
OFF
compressor
Turn off
4-way value
Compressor
ON
B
69
Commercial Air Conditioner
Come to defrost
Compressor
ON
E-Heat off for 30s?
Return
Turn off compressor
outdoor fun
Turn off for
55s?
Return
Return
Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
Open outdoor fun
Operation indoor
fun motor
4-way value
Return
Compressor
Clear the sign of
Compressor
off or 55s?
ON
ON ?
Return
defrosts
Return
Return