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8.2.3.4. Overload Protection Control
The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown in below figures.
8.2.3.5. Preliminary Operation Control
1. Purpose
To improve heating cool start characteristich in which compared to previous model, achived 40°C of discharge air in shorter
time.
time.
2. Detection method
a. OD air temperature sensor
b. ON timer = ON
c. Control by OD PCB preliminary operation mode ON/OFF jumper wire
b. ON timer = ON
c. Control by OD PCB preliminary operation mode ON/OFF jumper wire
3. Preliminary operation control judgement condition
a. Preliminary operation start when all below condition is fulfilled.
i. Air-conditioner is stop
ii. OD air temp
ii. OD air temp
-15°C
iii. ON Timer is set to ON
b. Either one of below condition is true, the preliminary operation is stopped.
i. Air-conditioning is running
ii. OD air temp
ii. OD air temp
-10°C
iii. Compressor operation started
4. Control method
a. Control start
min before the On Timer set time.
b. Compressor motor winding temp is increase by applying small amount of current with uncomplete power phase
c. Repetition of 1 min ON & 4 min OFF.
c. Repetition of 1 min ON & 4 min OFF.
time (min)
60
37
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