ESIE17-19C
|
Part 2. Troubleshooting
2.4. Component checklist
Page 50
19/08/19
|
Version 1.1
Optimized Heating 4
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.
2. Measure the voltage on 4-way valve connector: pin 1-3, see table
"Component checklist" on page 118
. If the measured voltage
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
"Replacing 4-way valve coil" on page 83
).
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
"Replacing 4-way valve coil" on page 83
).
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.
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
"Replacing 4-way valve body" on page 81
).
W
ARNING
: R
ISK
OF
F
IRE
When reconnecting a connector to the PCB, do not apply force, as this may damage the connector or connector pins of
the PCB.
W
ARNING
: R
ISK
OF
F
IRE
When reconnecting a connector to the PCB, do not apply force, as this may damage the connector or connector pins of
the PCB.
Determine the position of the 4-way valve
A
A’
B
B’
C
C’
