Crankcase Heater; Checking Procedures; Repair Procedures - Daikin VRV IV+ Service Manual

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a
a Strip
4 Attach all the strips (a).
3.3

Crankcase heater

3.3.1

Checking procedures

To perform an electrical check of the crankcase
heater
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see
page 118.
DANGER: RISK OF ELECTROCUTION
Confirm rectifier voltage is below 10 V DC before
proceeding.
2 Open the compressor insulation.
3 Disconnect the crankcase
appropriate PCB.
4 Measure the resistance on the crankcase heater connector: pin
1–pin 2. The resistance MUST be 1.8 kΩ±10%.
Is the measured resistance
correct?
Yes
No
5 Turn ON the unit using the respective circuit breaker.
6 Start the unit operation (via the user interface, operation switch,
central controller, ...).
7 With the cranckase heater energised (compressor OFF and
discharge temperature <70°C), measure the voltage on the
cranckase heater connector on the PCB. The measured voltage
MUST be 230 V AC.
Is the measured voltage
correct?
Yes
No
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
a
a
a
"3.13 Plate work" on
heater connector from the
Action
Continue with the next step.
Replace the crankcase heater,
see "3.3.2 Repair procedures" on
page 87.
Action
Return to the troubleshooting of
the specific error and continue
with the next procedure.
Replace the crankcase heater,
see "3.3.2 Repair procedures" on
page 87.
To perform an insulation check of the crankcase
heater
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see
page 118.
DANGER: RISK OF ELECTROCUTION
Confirm rectifier voltage is below 10 V DC before
proceeding.
2 Open the compressor insulation.
3 Set the Megger voltage to at least 500 V DC.
4 Connect the Megger ground test lead directly to the crankcase
heater ground wire.
CAUTION
Do NOT connect the Megger ground test lead to any other
ground wire.
5 Measure the insulation resistance between the phase and
ground wire. The measured insulation resistance MUST be
>1 MΩ.
Is the measured voltage
correct?
Yes
No
3.3.2

Repair procedures

To remove the crankcase heater
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see
page 118.
DANGER: RISK OF ELECTROCUTION
Confirm rectifier voltage is below 10 V DC before
proceeding.
2 Open the compressor insulation.
3 Detach the spring that fixes the crankcase heater on the
compressor.
3 Components
"3.13 Plate work" on
Action
Return to the troubleshooting of
the specific error and continue
with the next procedure.
Replace the crankcase heater,
see "3.3.2 Repair procedures" on
page 87.
"3.13 Plate work" on
Service manual
87