Daikin Altherma 3 H HT ECH2O Service Manual page 143

To perform a check of the backup heater contactor(s)
EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06
5 Activate backup heater: step 2.
6 Check the status in the Actuators menu of the user interface. This MUST be:
▪ Backup heater: step 1 = ON
And/Or
▪ Backup heater: step 2 = ON
7 Check if the field installed circuit breaker has tripped.
Did the fuse blow or did the field
supplied circuit breaker of the backup
heater trip?
Yes
No
Prerequisite: First perform an electrical check of the backup heater, see
"4.4.1 Checking procedures" [
1 Measure the power supply voltage between the following terminals of the
backup heater contactors:
For 1~, 230 V, 3 kW backup heater:
▪ K1M: 2‑4
▪ K2M: 2‑4
All measured voltages MUST be 230 V AC ± 10%.
For 1~, 230 V, 6 kW backup heater:
▪ K5M: 1‑3, 3‑5, 5‑13
All measured voltages MUST be 230 V AC ± 10%.
For 3~, 400 V, 9 kW backup heater:
▪ K5M: 1‑3, 3‑5, 1‑5
All measured voltages MUST be 400 V AC ± 10%.
Is the measured power supply voltage
correct?
Yes
No
2 Check the power supply (source) of the backup heater.
Is the power supply (source) of the
backup heater correct?
Yes
No
3 With the Actuator test run still active, activate backup heater: step 1.
4 Measure the voltage between the following terminals of the backup heater
contactors.
Action
Replace the backup heater, see
"4.4.2 Repair
Return to "4.4.1 Checking
procedures" [
heater and continue with the next
procedure.
4
140].
Action
Skip the next step.
Continue with the next step.
Action
Correct the wiring and/or components
between the power supply (source) and
the backup heater contactor, see
"7.2 Wiring
Adjust the power supply (source) of the
backup heater.
4 Components
|
4
procedures" [ 146].
4
140] of the backup
4
diagram" [ 392].
Service manual
143