Indoor Unit Electronic Expansion Valve - Fujitsu Airstage VR-II Series Service Manual

SERVICE PARTS INFORMATION 14

Indoor Unit Electronic Expansion Valve

(EEV)
Check Point 1 : Check Connections
Check Connectors (Loose connector or open cable.)
Duct, Cassette, Wall mount
Floor/ Ceiling, Ceiling, Small Wall mount
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 (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)
Check Point 2 : Check Coil of EEV
Check Point 3 : Check Voltage from Controller PCB
>> If it does not appear, replace Controller PCB.
Check Point 4 : Check Noise at start up
>> If an abnormal noise does not show, replace Controller PCB.
Pipe (Out)
(2)
Pipe (Out)
04-107
Remove connector, check each winding resistance of Coil.
Read wire Resistance value 68 F(20 ° C)
White - Red
Yellow - Brown
Orange - Red
Blue - Brown
If Resistance value is abnormal, replace EEV.
Remove Connector and check Voltage (DC12V).
Turn on Power and check operation noise.
If it is open,
it has no temp. difference between Inlet and Outlet.
OPEN
Example : Hot Gas
Pipe (In)
Pipe (In)
°
200 ± 10%
Pipe (Out)
Pipe (Out)
DC