8 Troubleshooting
314
SMGB0087 rev.0 - 12/2013
4-way solenoid
valve coil
4-way solenoid
valve coil
Time Chart
Heating operation
Cooling operation
or
Defrost operation
Heating operation
4-way solenoid valve
Coil voltage
is turned ON
Current is continuously
carried while the reversing
valve is ON.
Bistable solenoid operation type (pulse-activated)
Operation Mode: Cooling → Heating
Reversing Valve: OFF → ON
Operation Mode: Cooling → Heating
Reversing Valve: OFF → ON
When current is applied to the reversing valve coil, an electro-
magnetic force headed in the same direction as the magnetic
force is generated, and the valve is turned ON by their attraction.
After the valve is turned ON, the plunger position is kept by mag-
netic force with no current applied.
When current is applied to the reversing valve coil, an electro-
magnetic force headed in the direction opposite to the magnetic
force is generated, and the valve is turned OFF by their separa-
tion force. After the valve is turned OFF, the plunger position is
kept by spring force.
Coil
Attractor
Plunger
Plunger position
Coil case
Magnetic
screw
Spring force (separation force)
Electromagnetic force (Posi-
tion-keeping force)
Spacer
Magnet
Magnetic+Electromagnetic
force (Attraction)
When the reversing valve is
turned ON (Current Applied)
After the reversing valve is
turned ON (No Current Applied)
Coil
Attractor
Plunger
Plunger position
Coil case
Magnetic
screw
Spring+Electromagnetic force
(separation force)
Spring force (Position-keeping force)
Spacer
Magnet
Magnetic force (Attraction)
When the reversing valve is
turned ON (Current Applied)
After the reversing valve is
turned ON (No Current Applied)
Electrical circuit
When the reversing valve relay is turned ON, current is applied to
the coil. After the reversing valve relay is turned OFF, no current
is applied.
When the reversing valve relay is turned ON, current is applied to
the coil. After the reversing valve relay is turned OFF, no current
is applied.
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