4-Way Valve, Solenoid Control; (A) Normal Control Mode - Sanyo SPW-U253GH56 Service Manual

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
OFF
(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 OFF
HEAT
2
3 MINUTES TURN ON
TURN OFF
ON OFF
1
ON
Chart Summary and Explanations
4-way valve
Operation Mode
solenoid
COOLING OFF
HEATING ON
– 39 –
2. Processes and functions
ON
ON
COOL
THERMO OFF
THERMO
ON
ON OFF ON
2
1 1
OFF
2. . . More than 3 minutes
Compressor
ON
HEAT
THERMO OFF
THERMO
ON
OFF ON
2
1
ON
0443_M_S
Fig. 15
SM830035
2