Control Logic Description; Fan Only Mode; Cooling Mode - Hitachi RPIL-1.0PNN1DH Service Manual

5. CONTROL LOGIC DESCRIPTION

5. Control logic description

5.1 Fan Only Mode

(1) Outdoor fan and compressor stop.
(2) Temperature setting function is disabled, and no setting temperature is displayed.
(3) Indoor fan can be set to high/medium/low, but can not be set to auto.

5.2 Cooling Mode

Indoor fan running rules:
In cooling mode, indoor fan runs all the time and the speed can be selected as high,(medium),
low and auto.
The auto fan:
T1 is indoor room temperature. Ts is setting temperature.
Medium
Inverter outdoor unit：
Compressor and outdoor fan running rules:
Once the compressor starts up, it will follow the below rules:
When indoor room temp.T1 is lower than Ts, the compressor and outdoor fan will shut off.
When T1 is higher than Ts+1, the compressor and outdoor fan will start up.
Outdoor fan running rules:
Once the outdoor fan start up, it will follow the below rules:
Single outdoor fan: First, it will run in an invariable speed for a short time; Then it will regulate the
speed by the outdoor-coil temperature.
Double outdoor fan: If it has two outdoor fans, the upper fan regulates the speed by the rules,
and the downer fan speed lower than the upper fan speed for 30rpm~60rpm.
High
Low
0
-1
2
4 T 1- Ts
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