Emergency Operation Of Electronic Expansion Valve - Daikin LXE10E-A14 Service Manual

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6.5.3 Emergency operation of electronic expansion valve

In case of the controller malfunction or faulty electronic expansion valve coil, electronic expansion valve
can be operated with fixed valve opening by using emergency cap.
Caution
If the electronic expansion valve is energized while the coil is removed from valve body, the coil driver
with which the valve needle is pushed protrude excessively. In this state, when the valve is restored from
emergency operation, the needle may be caught with the driver resulting the valve fully closed.
Therefore, be sure not to energize the coil before emergency operation.
[Disenergizing of coil]
When controller malfunction
Disconnect the red power supply connector (red : CN5) on the terminal board
when removing of controller short circuit connector (SCC1-1 or SCC1-2) to
disenergize the electronic expansion valve.(described in the section 10.5.2)
When only electronic expansion valve is conducted emergency operation.
Disconnect CN18 on the controller CPU board to disenergize the
electronic expansion valve.
1. Remove the coil.
2. Set the emergency cap on the electronic expansion valve body.
3. Fully close the electronic expansion valve by turning the minus recessed screw of emergency cap
clockwise with miniature driver.
(Tightening torque: approx. 1 kgf cm The torque is required to tighten the valve softly until the driver
stops turning)
4. Then slightly open the electronic expansion valve by turning the minus recessed screw of emergency
cap counter clockwise for 60˚
5. Apply a loose-free adhesive on the screw.
q
Remove the coil.
w
Set the emergency
coil cap.
Emergency coil cap
(Parts no. 1080263)
6-16
CN18
e r
Fully close. Slightly open.
60° LXE10E