Actions At The Time Of Failure - Panasonic OCU-CR400VF8 Operating Instructions And Installation Instructions

Actions at the time of Failure

When a component failure or malfunction is found, request the specialty company to repair.
Actions at the time of Failure
When the refrigeration unit or any refrigerant circuit component fails to operate by some reasons, turn off the power for
a repair.
To avoid failure recurrence, use caution for the followings.
(1) To avoid recurrence of the same failure, execute reliable failure diagnosis and identify the true cause before
starting a repair.
When the ground fault protector is activated, check insulation of the equipment and circuit, eliminate the cause,
and then supply power gain.
(2) When the piping is to be corrected, be sure to release refrigerant from the welded point, and perform welding
while flowing nitrogen gas.
(3) When replacing the major component such as compressor, gas cooler, or refrigerant and oil, always replace the
filter dryer.
When the refrigerant circuit is contaminated by burnt compressor motor, etc. apply nitrogen blow to eliminate
refrigeration oil remaining in the refrigerant circuit.
(At such time, also remove the expansion valve (electronic expansion valve))
(4) When replacing the compressor, do not apply power to the crankcase heater while it is removed from the
compressor. Be sure to shut off the power. (It may lead to fire)
(5) To avoid current leak accidents, install the components (cover, electric parts, etc.) removed during inspection and
service and attach them as they were originally.
(6) Replace the filter circuit board (INV4-MF-EN PCB) as a whole when the fuse is broken.
(7) When the digital display (LED) on the CRD2-EN PCB does not operate with the power supplied, check the
followings.
Caution
Always check after shutting off the power.
When the failure cause is unknown, contact our service office with the failure symptom, model number,
manufacturing code, etc.
Fuse on INV4-MF-EN PCB destruction
1) FUSE1,2 or 3 broken ： Replace INV4-MF-EN PCB, INV4-H-EN PCB and Compressor
2) FUSE4 broken ： Replace INV4-MF-EN PCB, INV4-H-EN PCB, CR2-EN PCB
3) FUSE5 broken ： Replace INV4-MF-EN PCB and CR2-EN PCB
4) FUSE6 broken ： Replace INV4-MF-EN PCB and external unit.
5) FUSE7 broken ： Replace INV4-MF-EN PCB and Fan motor.
After checking the external device, when replace the PCB.
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