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7. Outdoor Unit Electronic Control Valves [MOV1, MOV2, MOV4]
7-1. Types of Electronic Control Valves
[CHDZ07263, CHDZR07263, CHDZ09663, CHDZR09663]
Capacity
Electronic control valve 1
Electronic
Electronic control valve 2
control valve
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.
Heat exchanger 2
Front
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 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 2 ~ 10°F.
●
During heating mode SH operation, refrigerant may not flow to the heat exchanger.
72
Heat exchanger 1 valve
Heat exchanger 2 valve
For SC circuit
Heat
exchanger 1
Type 72, 96
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
96
Heat exchanger 1 valve
Heat exchanger 2 valve
For SC circuit
MOV2
Remarks
480
Maximum fl ow control
0
Refrigerant shut-off
15~480
SH control
0
Refrigerant shut-off
50~480
Heat exchanger capacity control
0
Refrigerant shut-off
15~480
SH control
0
Refrigerant shut-off
3-WAY ECO-i SYSTEM
Control Functions
1
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