Daikin Altherma 3 M - Page 130

3 | Components
Service manual
130
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
To perform an insulation check of the booster heater
Prerequisite: First perform a resistance check of the booster heater, see
"3.5.1Checking procedures"[4129].
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 booster heater ground
wire.
CAUTION
Do NOT connect the Megger ground test lead to any other ground wire.
4 Measure the insulation resistance between the following terminals. The
measured insulation resistance MUST be >3MΩ.
Terminals
K3M1‑ground
K3M3‑ground
Is the measured booster heater
insulation resistance correct?
Action
Yes Return to "3.5.1Checking
procedures"[4129] of the booster
heater and continue with the next
procedure.
No Replace the booster heater, see
"3.5.2Repair procedures"[4132].
To perform an electrical check of the booster heater
Prerequisite: First perform an insulation check of the booster heater, see
"3.5.1Checking procedures"[4129].
Prerequisite: Check the circuit breaker. Reset if it has tripped.
1 Turn ON the power of the unit.
INFORMATION
If the circuit breaker or the booster heater thermal protector trips again, determine
the root cause of the problem. Something is overloading the electrical circuit or
creating a short-circuit.
2 Activate Installer on the user interface. See the installer reference guide
for the correct procedure.
3 Go to Actuator test run via the user interface.
4 Activate Booster heater test.
5 Check the status in the Actuators menu of the user interface. This MUST be:
▪ Booster heater test = ON
6 Check if the field installed circuit breaker has tripped.