Daikin altherma 3 M Service Manual page 186

3 | Components
To perform a diode module check
Service manual
186
2 Measure the voltage on the rectifier voltage check terminals (+ and –) of the
fan circuit on the main PCB.
Result: The measured voltage MUST be approximately 324 V DC when fan is
NOT running. Voltage can be higher when fan is running.
3 Measure the voltage on the rectifier voltage check terminals (+ and –) of the
compressor circuit on the main PCB.
Result: The measured voltage MUST be 535~560 V DC when compressor is
NOT running. Voltage can be higher when compressor is running.
a
b
a + terminal of fan circuit
b – terminal of fan circuit
c + terminal of compressor circuit
d – terminal of cmopressor circuit
INFORMATION
When measuring on the front of the main PCB, make sure to locally remove the
protective varnish with the test leads of the multi meter.
Is the measured rectifier voltage
correct?
Yes
No
1 First check the rectifier voltage of the main PCB, see
4
procedures" [ 204].
INFORMATION
If the rectifier voltage is OK, the diode module is OK. If rectifier voltage is NOT OK,
replace the main PCB.
Below procedure describes how to check the diode module itself.
2 Stop the unit operation via the user interface.
3 Turn OFF the respective circuit breaker.
c
d
Action
Perform a check of the power modules
of the main PCB, see "Checking
4
procedures" [ 181].
Replace the main PCB, see
4
procedures" [ 190].
EBLA09~16DA + EDLA09~16DA
"Repair
"Checking
Daikin Altherma 3 M
ESIE20-06A – 2021.03