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Section
– 38 – SM830076
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

Fig. 15

OFFOFFOFF
OFF
OFF
3 MINUTES
OFF
TURN ON
TURN OFF
THERMO OFF
THERMO
ON
THERMO OFF
THERMO
ON
22
2
1 111
OFF
SOLENOID COIL
(4-WAY VALVE)
COMPRESSOR
COOL
MODE
BUTTON HEAT
OPERATION
BUTTON
POWER SOURCE
1. . . More than 5 minutes 2. . . More than 3 minutes
ONON
HEAT
ON ON ON
HEAT
COOL
ON
ON
ON
ON
0443_M_S
Chart Summary and Explanations
❑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.
Operation Mode 4-way valve Compressor
solenoid
COOLING OFF ON
HEATING ON