The heat exchanger capacity and four-way valve, solenoid valve, and electronic expansion valve operation states are shown below.
1. Cooling, mainly cooling
Pattern
1
2
3
4
5
6
OFF
ON
ON
OFF
ON
OFF
ON
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
ON
ON
4-way valve (4WV)
Solenoid valve
(SV)
Electronic expansion
valve (EEV)
Used heat
exchange (HP)
4-way valve (4WV)
Solenoid valve
(SV)
Electronic expansion
valve (EEV)
Used heat
exchange (HP)
4-way valve (4WV)
Solenoid valve
(SV)
Electronic expansion
valve (EEV)
Used heat
exchange (HP)
Remarks
4WV2 4WV3 4WV4
SV7 SV8
Control pulse
Control pulse
0 pulse
Control pulse
Control pulse
Control pulse
EEV1
0 pulse
0 pulse
Control pulse
Control pulse
Control pulse
Control pulse
Cooling 2HP
Cooling 4HP
Cooling 6HP
Cooling 8HP
Cooling 10HP
Cooling 12HP
EEV2 2
4 6
2. Heating, mainly heating
Pattern
1
2
3
4
5
6
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
ON
ON
Remarks
4WV2 4WV3 4WV4
SV7 SV8
Control pulse
Control pulse
0 pulse
Control pulse
Control pulse
Control pulse
EEV1
0 pulse
0 pulse
Control pulse
Control pulse
Control pulse
Control pulse
Cooling 2HP
Cooling 4HP
Cooling 6HP
Cooling 8HP
Cooling 10HP
Cooling 12HP
EEV2 2
4 6
3. Stop and same capacity operation
Pattern
1
2
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
Remarks
4WV2 4WV3 4WV4 SV7 SV8
Control pulse
0 pulse
EEV1
Control pulse
0 pulse
Stop
Same capacity
EEV2 2 4 6
5-2 HEAT EXCHANGE CAPACITY CONTROL
– 45 –
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