Daikin EBLA04E V Series Service Manual page 117

To perform an insulation check of the backup heater
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05
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 "7.2 Wiring
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
"7.2 Wiring diagram" [
Is the measured backup heater
resistance correct?
Yes
No
Prerequisite: First perform a resistance check of the backup heater, see
4
procedures" [ 116].
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.
3 Connect the Megger ground test lead directly to the backup heater ground
wire.
4
diagram" [ 281] for more detailed information.
4
281].
Action
Return to
procedures" [
heater and continue with the next
procedure.
Replace the backup heater, see
procedures" [
draft – 31/05/2022 15:53
4 | Components
"Checking
4
116] of the backup
"Repair
4
120].
"Checking
Service manual
117