Output Of Pcb - Panasonic U-8ME1E8E 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 5 seconds before the inverter compressor starts. After the inverter compressor starts, the
valve is ON for ten 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
25Hz.
Remarks
4 way valve
Save valve
Refrigerant control valve
Refrigerant balance valve
Oil recoverly valve
By-pass valve for oil fl ushing
Refrigerant interception valve
MOV for heat exchanger 1
MOV for heat exchanger 2
MOV for Sub cooler
Crankcase heater for invertor
Crankcase heater for constant speed 1
Crankcase heater for constant speed 2
5 sec 10 sec
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