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Sequence of Operation
Electronic controller
RT - Room Temperature.
IPT - Indoor Pipe (Coil) Temperature.
ST - Indoor Setting Temperature.
OPT - Outdoor Pipe Temperature.
OAT - Outdoor Ambient Temperature.
ODT - Outdoor Discharge Temperature.
Cooling mode. CRT=RT
1. Auto mode
1.1. The set temperature can be adjusted from 61-88˚F in auto mode, the operation of fan speed and vane position change according to the
temperature setting.
2. Cooling mode
2.1 Temperature control : The set temperature can be adjusted from 61-88˚F in auto mode, the operation of fan speed and vane position
change according to the temperature setting.
2.2. Compressor and process control.
2.2.1. When RT-ST≥ 1˚F, the compressor starts, AC operates according to the temperature setting.
2.2.2). When
2.2.2.1. RT-ST≤ 5˚F, compressor keeps 2 min continuously;
2.2.2.2 RT-ST≤ 3.5˚F, compressor works in lowest frequency for 5 min continuously;
2.2.2.3 RT-ST≤ 2˚F, compressor works in lowest frequency for 10 min continuously,
The compressor stops operation.
2.2.3. The compressor frequency control: Based on relation of RT & ST, and the changing speed of RT.
2.2.4. The compressor will also stop working while unit is:
a. switched off.
b. under protection.
c. changed to fan mode.
2.2.5. Under normal operation, the compressor can be stopped by program only after 7 min once it starts up.
2.2.6. IOnce the compressor is stopped by program, restart will be delayed for 3 minutes.
3. Outdoor Fan motor control:
3.1. While unit is:
3.1.1 switched off.
3.1.2 under protection.
3.1.3 to the set temperature.
After compressor shutdown, the fan motor stops working according to the temperature of OPT and OAT, the max delay
for the motor should be less than 160s.
3.2. When the unit is switched on in cooling mode, outdoor fan motor will delay 5s after compressor starts up.
4. When Main PCB fails or stops for protection, Display PCB works as preset.
18
OPERATION
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