Electronic Expansion Valve - Daikin 2MXM50M Service Manual

ESIE16-02B | Part 2. Troubleshooting

2.4.2.3. Electronic expansion valve

Technical specification
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).
Location
Piping diagram
See "Outdoor unit" on
page 104.
Check procedure
Mechanical check
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
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
Electrical check
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
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
4/04/17 | Version 1.1
RA R32 Split & multi split M-Series
Wiring diagram
See "Outdoor unit" on
page 99.
"Basic removal" on page
"Replacing expansion valve body" on page
"Basic removal" on page
Description
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).
Switch box
See "Outdoor unit" on
page 111.
68).
81).
68).
2.4. Component checklist
Component overview of unit
See "Outdoor unit" on page 110.
Page 49