Daikin 2MXM50M Service Manual page 46

ESIE16-02B | Part 2. Troubleshooting
2. Switch off Daikin unit with the field supplied circuit breaker.
3. Remove plate work when required.
PROCEDURE
1. Switch on the Daikin unit, start heating operation.
W : R
ARNING
When reconnecting a connector to the PCB, do not apply force, as this may damage the connector or connector pins of
the PCB.
2. Measure the voltage on 4-way valve connector: pin 1-3, see table
does not range 220-240 VAC during switching / 15 VAC after switching, unplug 4-way valve connector from PCB and measure
the voltage directly on the PCB: pin 1-3 of 4-way valve connection.
- If the voltage, measured directly on the PCB does not range 220-240 VAC during switching / 15 VAC after switching,
replace main PCB.
- If the voltage, measured directly on the PCB does range 220-240 VAC during switching / 15 VAC after switching, replace
the 4-way valve coil (refer to
W : R
ARNING
When reconnecting a connector to the PCB, do not apply force, as this may damage the connector or connector pins of
the PCB.
3. Unplug 4-way valve connector from PCB and measure the resistance of the 4-way valve coil. If the measured resistance does
not range 1000 - 2000 Ω, replace the 4-way valve coil (refer to
4. Switch on the Daikin unit, start cooling/defrost operation.
If the temperature after the plate type heat exchanger rises, the control of the 4-way valve is wrong. Replace main PCB.
Determine the position of the 4-way valve
1. Switch off Daikin unit via the user interface.
2. Switch off Daikin unit with the field supplied circuit breaker.
3. Slide a magnet over the front and the rear of the 4-way valve body and sense the attraction of the magnet to determine the
valve position.
4. If the magnet is attracted in positions A,A' or B,B', the 4-way valve is OK; if the magnet is attracted in positions C,C' the 4-way
valve must be replaced (refer to
A
Page 46
RA R32 Split & multi split M-Series
F
ISK OF IRE
"Replacing 4-way valve coil" on page
F
ISK OF IRE
"Replacing 4-way valve body" on page
A' B
"Component checklist" on page
75).
"Replacing 4-way valve coil" on page
73).
B' C
2.4. Component checklist
111. If the measured voltage
75).
C'
4/04/17 | Version 1.1