Fujitsu AS G18KMTA Series Service Instruction page 59

SERVICE PARTS INFORMATION 3
Outdoor unit Electronic Expansion Valve
( EEV )
Check Point 1 : Check Connections
Check connection of connector
( Loose connector or open cable )
EXPANSION
VALVE COIL
RED
1 1
BLUE
2 2
EV
P30
ORANGE
3 3
YELLOW
4 4
WHITE
5 5
Check Point 2 : Check Coil of EEV
Remove connector, check each winding
resistance of Coil.
Read wire
White - Red
Yellow - Red
46
Orange - Red
Blue - Red
If Resistance value is abnormal, replace EEV.
Check Point 5 : Check Opening and Closing Operation of Valve
When Valve is closed,
it has a temp. difference between Inlet and Outlet.
CLOSE
Example : Hot Gas
Pipe (In)
Check Point 6 : Check Strainer
Strainer normally does not have temperature difference between inlet and outlet as shown in
but if there is a difference as shown in
Pipe (In)
Resistance value
3
at 20°C
Pipe (Out)
, there is a possibility of inside clogged. In this case, replace Strainer.
Pipe (Out)
Check Point 3 : Check Noise at start up
Turn on Power and check operation noise.
If an abnormal noise does not show,
replace Main PCB.
Check Point 4 : Check Voltage from Main PCB.
Remove Connector and check Voltage (DC12V)
If it does not appear, replace Main PCB.
12V
RED
1 1
BLUE
2 2
ORANGE
P30 3 3
YELLOW
4 4
WHITE
5 5
If it is open,
it has no temp. difference between Inlet and Outlet.
OPEN
Example : Hot Gas
Pipe (In)
Pipe (In)
02-57
DC
EV
Pipe (Out)
,
Pipe (Out)