Fujitsu Airstage VR-II Series Service Manual page 199

SERVICE PARTS INFORMATION 17
Outdoor Unit Electronic Expansion Valve
(EEV3)
Check Point 1 : Check Connections
Check connection of connector (CN160)
(Loose connector or open cable)
Check Point 2 : Check Coil of EEV3
Remove connector, check each winding resistance of Coil.
Read wire Resistance value 68 F(20 ° C)
White - Red
Yellow - Red
Orange - Red
Blue - Red
If Resistance value is abnormal, replace EEV3.
Check Point 5 : Check Opening and Closing Operation of Valve
When EEV3 is closed,
it has no temp. difference between Inlet and Outlet.
CLOSE
Pipe (In)
In the following cases, even if EEV3 is closed, there may be a difference in temp.
- On comp. start-up
- Just after swiching the EEV3 (Open --> Close)
Check Point 6 : Check Strainer
Strainer normally does not have temperature difference between inlet and outlet as shown in (1), but if there is a difference
as shown in (2), there is a possibility of inside clogged. In this case, replace Strainer.
(1)
Pipe (In)
CN116
°
46 ± 4
Pipe (Out)
Pipe (Out)
CN117 CN160
Check Point 3 : Check Noise at start up
Turn on Power and check operation noise.
>> If an abnormal noise does not show, replace Controller PCB.
Check Point 4 : Check Voltage from Controller PCB
Remove Connector and check Voltage (DC12V).
>> If it does not appear, replace Controller PCB.
12V
If it is open, it has a temp. difference between Inlet and Outlet.
Outlet temp. is near Low-pressure saturated temp.
OPEN
Pipe (In)
(2)
Pipe (In)
04-110
Pipe (Out)
Note
If valve opening is 12~51pls,
the check of temp. cannot be performed.
Check temp. at the other valve opening.
Pipe (Out)
DC