Haier HDU-60CA03T3 Service Manual page 24

(1). Tr>Ts+2
℃, compressor, outdoor fan motor continue running, while indoor fan motor runs at
set fan speed. This working area is defined as area A.
(2). Ts≤Tr≤Ts＋２℃, the compressor and outdoor fan motor run for 10 minutes then pause for 6
minutes, while indoor blowing fan runs at low speed. This working area is defined as area B.
(3). Tr < Ts, the compressor and outdoor fan motor stop working while outdoor blowing fan runs at
low speed. This working area is defined as area C.
b. After dehumidifying program starting, the system converts between A, B and C areas according
to variations of room temperature with running mode. If working in area A, when Tr＜Ts+1, it
converts to area B; If working in area C, when Tr > Ts, it converts to area B; If working in area B,
when Tr>Ts+3, it converts to area A, and Tr<Ts-1, it converts to area C. The conversion is shown
as the chart below:
c. Freeze protection
After the compressor has run for 6 minutes, If the temperature of indoor coil pipe Ticp< 1℃, the
compressor and outdoor fan motor will stop and change to blowing mode. They will run again after
the compressor stops if both the following conditions are meeted:
1) 9 minutes have passed since compressor stops.
2)
Ticp exceeds 10℃
d. Overheat protection
2.5 Blowing operation
Outdoor fan motor and compressor stop, and indoor fan speed can be set as high, med or low. Fan
blade can be set swing or stay in one position. Also it can set timer or sleep and high voltage
removing dirt or fresh air function.
2.6 Heating operation(Cooling only unit without this function)
2.6.1 Wired type unit
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, the controller determines compressor
run/stop according to the difference
between current room temperature and
set temperature.
Commercial Air Conditioner
Area A
Area A
Ts＋1
Area B
Area B
Ts－1
Area C
Area C
Ts－1
compressor run
24
Ts＋3
Ts
compressor stop
Ts＋1