Daikin R32 Sky-Air RZAG-M Service Manual page 47

ESIE17-08 | Part 2. Troubleshooting
PRELIMINARY ACTIONS
1. Switch off Daikin unit via the user interface.
2. Switch off Daikin unit with the field supplied circuit breaker.
3. Remove plate work when required (refer to
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
15/11/18 | Version 1.1
R32 Sky-Air RZAG-M
"Basic removal" on page
F
ISK OF IRE
"Replacing 4-way valve coil" on page
F
ISK OF IRE
"Replacing 4-way valve body" on page
A' B
67).
"Component checklist" on page
76).
"Replacing 4-way valve coil" on page
75).
B' C
2.4. Component checklist
128. If the measured voltage
76).
C'
Page 47