Haier Unitary smart series Service Manual page 139

When receiving the indoor rated operation command, the unit will enter rated cooling operation.
Rated heating:
When receiving the indoor rated operation command, the unit will enter rated cooling operation.
When receiving the indoor min. heating operation command, the unit will enter min. heating
operation.
In rated operation period, the frequency can be adjusted by manual. Once being adjusted by
manual, the unit will not receive the indoor frequency.
7.2.9.8 Outdoor compulsory operation
Compulsory cooling operation
Put the first bit of dip switch on the indicator board at OFF, the unit will enter compulsory cooling
operation, as follow:
Compressor Current, discharging
startup protection and failure
treatment
normal normal
Compulsory heating operation
Put the second bit of dip switch on the indicator board at OFF, the unit will enter compulsory heating
operation, as follow:
Compressor Current,
startup discharging
protection
failure treatment
normal normal
7.2.9.9 High pressure switch
3 minutes later after compressor starts up, the system will check the pipe pressure. If the pipe
pressure is over high and high pressure switch acts for over 30 seconds, the compressor and
outdoor motor will stop, 3 minutes later, the unit will resume. If in 30 minutes the unit stops for 3
times because of overhigh pressure, the system will alarm, then compressor will not start up again;
when being electrified after being powered off, the protection will be cancelled.
9.10 Low pressure switch
When compressor stops, if low pressure switch acts for 30 seconds contineously, the unti will
alarm.
When compressor starts up, in 3 minutes, low pressure switch will be shielded.
In defrosting or in 6 minutes after defrosting is over, low pressure switch will be shielded.
7.2.9.11 Failure code and troubleshooting
Alarm lamp is off when no failure
Operation before
the base open angle
Normal
Operation before
the base open angle
and
Normal
a__
3 minutes later
compressor is running
1: fixed base open angle
2: fixed running frequency 60HZ
3: fixed outdoor motor speed:
class-7
3 minutes later
compressor is running
1: fixed base open angle
2: fixed running frequency
50HZ
3: fixed outdoor motor speed:
class-7
-139-
^ a` a`
after Manual adjustment
1: angle adjusted by
hand
2: frequency adjusted
by hand
3: fan speed adjusted
by hand
after Manual adjustment
1: angle adjusted
hand
2: frequency adjusted by
hand
3: fan speed adjusted by
hand
by