Output Of Pcb - Panasonic U-8ME1E81 Service Manual

4. Output of PCB

Item
Electromagnetic valve
Motor operated valve
Crankcase heater
4-1. 4-way valve [20S]
- This valve turns OFF at cooling, and turns ON at heating operation.
- This valve turns OFF at defrosting.
* When the outdoor unit stops, the 4-way valve maintains the same state just before. However, when the system
stopped condition continues for 30 minutes, it is turned OFF.
4-2. SAVE valve [SAVE]
- This valve turns ON for 5 seconds before the inverter compressor starts. After the inverter compressor starts, the
valve turns ON for 10 seconds. After that, it turns OFF.
SAVE valve
Inverter compressor
- This valve turns ON for 30 seconds after the outdoor unit stops. After that, it turns OFF.
- This valve turns ON when high pressure sensor detects 3.4MPa to prevent abnormal pressure. This valve turns
OFF when the high pressure goes down below 3.3MPa.
3.4MPa
3.3MPa
High pressure
- This valve might turn ON when the system capacity is excessive although the inverter compressor operates at
Min. frequency.
- This valve turns ON in the following status :
(Compressor discharge temperature - High pressure saturation temperature) < 5°C
Remarks
4-way valve
Save valve
Refrigerant control valve
Refrigerant balance valve
Oil recoverly valve
By-pass valve
Refrigerant interception valve
MOV for heat exchanger 1
MOV for heat exchanger 2
SC Circuit Electronic control valve
Crankcase heater for inverter
Crankcase heater for constant speed 1
Crankcase heater for constant speed 2
5 seconds 10 seconds
Inverter compressor start
SAVE valve
Control Functions-Outdoor Unit
Indication on PCB
20S
SAVE
RCV
RBV
ORVR
BPV
O2
MOV1
MOV2
MOV4
CH1
CH2
CH3
1 - 11
2WAY SYSTEM
1