Outdoor Unit Electronic Control Valves [Mov1, Mov2, Mov3, Mov4] - Panasonic U-10MF1E8 Service Manual

7. Outdoor Unit Electronic Control Valves
[MOV1, MOV2, MOV3, MOV4]
7-1. Types of Electronic Control Valves
[U-8MF1E8, U-10MF1E8, U-12MF1E8, U-14MF1E8, U-16MF1E8]
Capacity
Electronic
control valve 1
Electronic
control valve 2
Electronic
control valve
Electronic
control valve 3
Electronic
control valve 4
7-2. Power Initialization
If no indoor units have started (even once) after the power was turned ON, the outdoor unit electronic control valve
operates at 480 pulses.
7-3. Heat Exchanger Controlled by Each Electronic Control Valve
The configuration of the heat exchangers is different depending on the capacity of the outdoor unit. MOV3 is not
present in U-12MF1E8 and below.
Heat exchanger 2
Front
U-8MF1E8, 10MF1E8, 12MF1E8
Operation of electronic control valves during normal unit operation
All indoor units in Cooling mode
All indoor units in Heating mode
Outdoor heat
Mixed
exchanger condenser
heating/
cooling
Outdoor heat
operation
exchanger evaporator
●
When all indoor units are operating in Cooling mode or Heating mode, all outdoor unit heat exchangers are used
if even one of the compressors in that outdoor unit is operating.
●
During mixed heating/cooling operation, the number of heat exchangers used varies according to the conditions
of the indoor units. However, heat exchanger 1 at the outdoor unit which contains the inverter compressor with
the lowest amount of operating time is always used.
●
SH control controls the difference between the liquid temperature and gas temperature to 1 ~ 5°C.
●
During heating mode SH operation, refrigerant may not flow to the heat exchanger.
8 hp 10 hp
Heat exchanger Heat exchanger
1 valve 1 valve
Heat exchanger Heat exchanger
2 valve 2 valve
None None
For SC circuit For SC circuit
Heat exchanger 3
Heat
exchanger 1
Heat exchanger
MOV1
status
Condensor 480
Stopped 0
Evaporator 45~480
Stopped 0
Condensor 50~480
Stopped 0
Evaporator 45~480
Stopped 0
1 - 19
12 hp
Heat exchanger Heat exchanger
1 valve 1 valve
Heat exchanger Heat exchanger
2 valve 2 valve
Heat exchanger
None
3 valve
For SC circuit For SC circuit
Front
U-14MF1E8, 16MF1E8
MOV2 MOV3
480 480 Maximum fl ow control
0 0 Refrigerant shut-off
15~480 15~480 SH control
0 0 Refrigerant shut-off
50~480 480 Heat exchanger capacity control
0 0 Refrigerant shut-off
15~480 15~480 SH control
0 0 Refrigerant shut-off
3-WAY SYSTEM
Control Functions
14 hp 16 hp
Heat exchanger
1 valve
Heat exchanger
2 valve
Heat exchanger
3 valve
For SC circuit
Heat exchanger 1
Heat exchanger 2
Remarks
1