Fujitsu ASU 9RLF Service Instructions Manual page 52

SERVICE PARTS INFORMATION 3
Outdoor unit Electronic Expansion Valve
( EEV )
Check Point 1 : Check Connections
Check connection of connector (CN40)
( Loose connector or open cable )
EXPANSION
RED VALVE COIL
1
2
BLUE
3
CN40 EV
ORANGE
4
YELLOW
5
WHITE
6
Check Point 2 : Check Coil of EEV
Remove connector, check each winding
resistance of Coil.
Read wire Resistance value
White - Red
Yellow - Red
46
at 20°C
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)
Hi TEMP.
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)
Check Point 3 : Check Voltage from Main PCB.
Check Point 4 : Check Noise at start up
4
Pipe (Out)
Normal TEMP.
, there is a possibility of inside clogged. In this case, replace Strainer.
Pipe (Out)
02-31
Remove Connector and check Voltage (DC12V)
If it does not appear, replace Main PCB.
Turn on Power and check operation noise.
If an abnormal noise does not show,
replace Main PCB.
If it is open,
it has no temp. difference between Inlet and Outlet.
OPEN
Example : Hot Gas
Pipe (In)
Hi TEMP.
Pipe (In)
DC
Pipe (Out)
Hi TEMP.
,
Pipe (Out)