Daikin Altherma 3 M - Page 105

3 | Components
Service manual
105
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
To perform a resistance check of the backup heater
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see "3.17Plate work"[4230].
a
a Backup heater contactor K1M
2 Measure the backup heater resistance between K1M/1 and K1M/3.
Result: The measured resistance MUST be approximately 18Ω.
INFORMATION
See the "6.2Wiring diagram"[4314] for more detailed information.
INFORMATION
Make sure that the wiring between the backup heater contactors and the backup
heater connector is properly connected and NOT damaged (check continuity), see
"6.2Wiring diagram"[4314].
Is the measured backup heater
resistance correct?
Action
Yes Return to "Checking
procedures"[4104] of the backup
heater and continue with the next
procedure.
No Replace the backup heater, see "Repair
procedures"[4108].
To perform an insulation check of the backup heater
Prerequisite: First perform a resistance check of the backup heater, see "Checking
procedures"[4104].
1 Open all circuit breakers.
CAUTION
To prevent damage to the unit, all circuit breakers MUST be opened before using a
Megger.
2 Set the Megger voltage to 500VAC.