Outdoor Unit Solenoid Valve (Sv4,Sv5); Normal Operation; Protection Function - Fujitsu Airstage V series Service Manual

SERVICE PARTS INFORMATION 9

Outdoor Unit Solenoid Valve (SV4,SV5)

Check Point 1 : Check connections
p Check connection of connector.
(Loose connector or open cable)
Check Point 4 : Check opening & closing operation of Valve
p Depending on either during operation or protection control, check if Valve is operating normally.
(When Valve opens, there is no temperature difference between Inlet and Outlet.)

Normal Operation

Pipe (In) TEMP. Hi,
Pipe (Out) TEMP.Normal
Pipe (In)
Hi TEMP.
p If the valve closes by removing the connector of the valve
which does not close, it is considered to be Controller PCB
failure. Replace Controller PCB.
p If it does not close by removing connector, there is a
possibility of (1) clogging by dirt, or (2) deformation by
the heat at the time of Solenoid Valve installation.
In this case, replace Solenoid Valve.
CLOSE
Pipe (Out)
Normal TEMP.
SOLENOIDE COIL
AC
(1)
Check Point 2 : Check Solenoid Coil
p Remove connector and check if coil is open.
>>Normal resistance value of each coil: 1324 ± 7% (20°C)
>> If Resistance value is abnormal, replace Solenoid Coil.
Check Point 3 : Check Voltage from Controller PCB
p Remove connector and check the voltage (AC220V).
>> If the voltage does not appear, replace Controller PCB.

Protection Function

Pipe (In) TEMP. = Pipe (Out) TEMP.
Pipe (In)
Hi TEMP.
06-96
OPEN
Pipe (Out)
Hi TEMP.
SOLENOIDE COIL
AC
(2)
AC