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2. PROCESSES AND FUNCTIONS
2-11 4-Way Valve, Solenoid Control
The basic function of the 4-way valve is to direct the refrigerant in the correct direction
according to the Operation Mode (COOLING or HEATING) selected.
The following two charts show conditions of the controls and functions listed in the left
hand column when the solenoid is ON or OFF. Chart (A) on this page shows the
relationships when the temperature control is in NORMAL mode, and Chart (B) on the
next page shows the relationships when the remote controller is set to AUTO mode.
(A) Normal Control Mode
POWER SOURCE
OFF
OPERATION
BUTTON
COOL
MODE
BUTTON HEAT
COMPRESSOR
SOLENOID COIL
(4-WAY VALVE)
1. . . More than 5 minutes
For the first 3 minutes after power is applied, the 4–way valve remains OFF and the
compressor will not operate, even if the ON button is pushed.
If the 4–way valve is turned OFF with the compressor operating, the air conditioner
operates in COOLING mode. See Table below.
If the 4–way valve is turned ON with the compressor operating, the air conditioner operates
in HEATING mode. See Table below.
ON
HEAT
3 MINUTES
TURN OFF
ON
OFF
1
OFF
ON
Chart Summary and Explanations
Operation Mode
COOLING
HEATING
ON
OFF
COOL
2
TURN ON
ON
1
OFF
2. . . More than 3 minutes
4-way valve
Compressor
solenoid
OFF
ON
ON
41
–
–
ON
HEAT
THERMO OFF
THERMO OFF
THERMO
THERMO
ON
ON
OFF
ON
OFF
2
2
1
ON
Fig. 15
2
ON
1
0443_M_S
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