Haier HDU-60CA03T3 Service Manual page 25

Tr≥Ts+1 compressor stop
Tr≤Ts-1 compressor run
Ts-1<Tr<Ts+1 compressor in original state
2.6.2 Remote type units:
a. 4-way valve control: enter heating mode and compressor starts up; 4-way valve is on. If in
heating mode, compressor stop, 4-way valve will stop after 2 minutes. If it is from heating mode to
other mode, compressor will stop firstly, after 2 minutes 4-way valve stop, too.
b. The first time to heating mode, compressor and outdoor fan motor start up, after 8 minutes,
system will check the indoor room temperature, the controller determines compressor run/stop
according to the difference between current room temperature and set temperature. Every starting
up, it will not be affected by indoor room temperature within 8 minutes. The remote controller can
release 8-minute limit.
Ts stands for set temperature in remote controller, Tr stands for current room temperature, △
Tstands for compensation temperature. So:
Tr≥（Ts+4）+△T + 1
Tr≤（Ts+4）- 1
（Ts+4）- 1 <Tr<（Ts+4）+△T + 1
(Ts+4)-1
compressor run
In heating mode, there is auto temperature compensation, whose condition is compressor achieve
the temperature condition and the time < 5 minutes from the compressor shut off to the compressor
start up again. The rule is below:
A. △T=Ts-Tr (compressor start up)
B. If Ts-Tr≥2℃, △T=2℃; If Ts-Tr=1℃, △T=1℃; If Ts-Tr≤0℃, △T=0℃。
C. With compensation, if pressing the temperature reducing button of remote controller, △T=0℃; if
pressing the temperature increasing button, △T will remain the original value.
Anti-current rush: 1.6 seconds later after compressor is running, outdoor and indoor motor can
work.
Outdoor fan motor and compressor will open and close simultaneously (except for overheating),
indoor fan speed can be set high, med, low, auto. And the air blade can swing or stay in one
position. Also it can be set timer or sleep.
2.6.3 Overheat protection (for the unit with outdoor communication, the outdoor motor is
controlled by outdoor unit, but the compressor is still controlled by indoor unit, and their temperature
points will not be accordant completely)
In heating mode, compressor has started up and indoor motor has run for over 30 seconds, if indoor
coil temperature Tg>60℃, outdoor motor will stop; if Tg<56℃, and outdoor motor has stop for 45s,
outdoor motor will run again; if Tg>68℃, the compressor will stop and indoor motor will run
Commercial Air Conditioner
compressor stop
compressor run
compressor in original state
compressor stop
（Ts+4+△T）+1
25