ESIE16-02B | Part 2. Troubleshooting 2.4. Component checklist
4/04/17 | Version 1.1 Page 49
RA R32 Split & multi split M-Series
2.4.2.3. Electronic expansion valve
PRELIMINARY ACTIONS
1. Switch off the Daikin unit via the user interface.
2. Switch off the Daikin unit with the field supplied circuit breaker.
3. Switch on the Daikin unit and listen to the expansion valve assembly, if the expansion valve body does not create a latching
sound, continue with the electrical check.
4. Switch off the Daikin unit via the user interface.
5. Switch off the Daikin unit with the field supplied circuit breaker.
6. Remove plate work when required (refer to "Basic removal" on page 68).
PROCEDURE
1. Remove the expansion valve coil from the expansion valve body.
2. Slide the magnet (tool part N° 9950038) over the expansion valve body and gently rotate the magnet to manually operate the
expansion valve body clockwise (closing) and counterclockwise (opening).
3. If it is not possible to open the expansion valve body with the magnet, the expansion valve body is blocked and the expansion
valve body must be replaced (refer to "Replacing expansion valve body" on page 81).
PRELIMINARY ACTIONS
1. Switch off the Daikin unit via the user interface.
2. Switch off the Daikin unit with the field supplied circuit breaker.
3. Remove plate work when required (refer to "Basic removal" on page 68).
PROCEDURE
1. Check if the electrical connector of the expansion valve coil was correctly connected to the PCB, if not, connect the electrical
connector.
2. Disconnect the electrical connector of the expansion valve coil and check the continuity between below pins using a multi
meter. It should be ± the same value.
- Connector pin 1-6: connected
Technical specification Description
The electronic expansion valve has a hermetically sealed body
with a slide-on stepping motor drive coil (480 pulses from fully
closed to fully open position).
The electronic expansion valve is used:
• To control the flow of refrigerant. Depending on location, the
trigger point is sub-cool or superheat.
• To stop the flow of refrigerant completely when closing (=
0 pulses).
Location
Piping diagram Wiring diagram Switch box Component overview of unit
See "Outdoor unit" on
page 104.
See "Outdoor unit" on
page 99.
See "Outdoor unit" on
page 111.
See "Outdoor unit" on page 110.
Check procedure
Mechanical check
Electrical check
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