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Components
Service manual
235
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
4
Remove the crankcase heater from the compressor and wait for 5 minutes
(until the heater element reaches ambient temperature).
5
Disconnect the crankcase heater connector from the appropriate PCB.
6
Measure the resistance on the crankcase heater connector.
Result:
The resistance MUST be 1.8 kΩ±10%.
Is the measured resistance correct?
Action
Yes
Continue with the next step.
No
Replace the crankcase heater, see
7
Connect the crankcase heater connector to the appropriate PCB and install
the crankcase heater on the compressor.
8
Turn ON the power using the respective circuit breaker.
9
Start the unit operation via the central controller.
INFORMATION
Verify that the read‑out of the outdoor air thermistor, discharge thermistor and
compressor body thermistor (if available) is correct.
▪
Measure the outdoor temperature. Use a contact thermometer to measure the
other thermistor temperatures.
▪
Compare with the read-out via the service monitoring tool or field settings.
10
With the crankcase heater energised (compressor OFF and discharge
temperature <70°C), measure the voltage on the crankcase heater connector
on the PCB.
Result:
The measured voltage MUST be 230 V AC.
INFORMATION
The compressor body temperature MUST raise at least 5°C before the crankcase
heater is deactivated.
Is the measured voltage correct?
Action
Yes
Perform an insulation check of the
crankcase heater, see
234].
No
Perform a check of the main PCB, see
To perform an insulation check of the crankcase heater
Prerequisite:
First perform an electrical check of the crankcase heater, see
Prerequisite:
Stop the unit operation via the central controller.
1
Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Confirm the rectifier voltage is below 10 V DC before proceeding, see
356].
2
Set the Megger voltage to at least 500 V DC.
Summary of Contents for VRV IV+
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