LREQ5~20B7Y1
Air cooled refrigeration condensing unit
4PW74303-1C – 2016.02
Operation manual
4
6. CARE AND CLEANING METHOD
Be sure to stop the operation of the unit with the operation switch
and turn off the power (i.e., turn off the earth leakage breaker)
before starting the maintenance of the unit.
CAUTION
Do not touch the aluminium fin directly at the time of
cleaning.
Doing so may result in injury.
Do not wash the condensing unit with water, as this may
result in electric shocks or fire.
Before cleaning, be sure to stop unit operation, turn the
power circuit breaker off or remove the power cord.
Otherwise, an electric shock and injury may result.
•
Request your dealer for heat exchanger cleaning periodically.
7. TROUBLESHOOTING
7-1 The following cases are not malfunctions.
1. The unit does not operate.
•
The unit is restarted immediately after the unit comes to a stop.
The unit is under control in order not to impose a heavy duty on
the machinery parts. The operation of the unit will start in 1 to 5
minutes.
•
The unit has been just turned on.
The microprocessor requires preparations. Wait for
approximately two minutes.
2. The unit does not come to a stop.
•
The operation switch was turned off a while ago.
The unit operates for a while before the unit comes to a stop in
order to protect the machinery parts. The unit will come to a stop
after the operation is over.
3. The unit generates noise.
•
The unit in cooling operation generates low hissing sound
continuously.
This is the sound of gas (refrigerant) flowing in the condensing
unit.
•
The unit generates hissing sound immediately after the unit
starts operating or comes to a stop.
This is the sound of gas (refrigerant) flowing.
•
The unit rattles when the unit is operated and stopped
repeatedly.
This is the sound of gas (refrigerant) flowing inside the
condensing unit.
4. The outdoor fan does not rotate.
•
The unit is in operation.
The fan is under RPM control in order to maintain the optimum
operation of the product.
5. Neither the compressor of the outdoor unit nor the outdoor
fan comes to a stop.
•
The phenomenon occurs after the unit comes to a stop.
The compressor and outdoor fan continue operating in order to
prevent the detention of refrigerant oil and refrigerant. They will
come to a stop in about 5 to 10 minutes.
7-2 Check before requesting servicing.
1. The unit does not operate at all.
•
Has the power supply fuse not blown out?
Turn off the power. (Consult your dealer for the replacement of
the power supply fuse.)
•
Is the power circuit breaker not turned off?
Turn on the power if the knob of the power circuit breaker is set
to the OFF position.
Do not turn on the power if the knob of the power circuit breaker
is set to the trip position. (Consult your dealer.)
•
Is there no blackout?
Wait until power is restored. If power failure occurs during
operation, the system automatically restarts immediately after
the power supply is recovered.
•
Are all the power supplies turned on?
Turn all the power on.
2. The unit comes to a stop soon after the unit starts operating.
•
Do obstacles not block the air inlet or outlet of the outdoor unit
or indoor unit?
Remove the obstacles.
3. The cooling operation of the unit is bad.
•
Does the indoor unit (unit cooler and showcase) not have much
frost?
Defrost manually or shorten the cycle of defrosting operation.
•
Are there not too many articles inside?
Reduce the number of articles.
•
Is the circulation of cold air in the indoor unit (unit cooler and
showcase) smooth?
Change the allocation of the articles.
•
Is there not much dust on the heat exchanger of the outdoor
unit?
Remove the dust with a brush or vacuum cleaner without using
water or consult your dealer.
•
Is cold air not leaking outside?
Stop the leakage of cold air.
•
Is the set temperature in the indoor unit (unit cooler and
showcase) not too high?
Set the temperature appropriately.
•
Are high-temperature articles not stored?
Store them after they are once cooled off.
•
Is the opening time of the door not long?
Minimize the opening time of the door.
7-3 Consult your dealer in the following cases.
WARNING
When the condensing unit is malfunctioning (giving off a
burning odor, etc.) turn off the power to the unit and contact
your local dealer.
Continued operation under such circumstances may result in a
failure, electric shocks or fire hazards.
1. Safety devices, such as the fuse, breaker, and earth leakage
breaker, frequently operate or the operation of the operation
switch is not stable.
Contact your dealer after turning the power off.
2. Turn off the power and consult your dealer if symptoms other
than the above are noticed or the equipment does not go into
normal operation after taking the steps specified in 7-2.
8. INSPECTION
The preventive maintenance of the unit is required in order not to
damage commercial products. Request a contractor authorized
by our dealer for inspection.
Refer to information on
"Maintenance inspection" on page 6
for
maintenance inspection.
Tab
Trip position
Power circuit breaker
(earth leakage breaker)
ON
OFF
4PWEN74303-1C.book Page 4 Thursday, March 10, 2016 10:59 AM
