GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
22
Incorrect amount of refrigerant is
filled.
The system cannot correctly control the flow allocation; the
compressor may be operating under over-heating environment or
running when the refrigerant flows back to the compressor..
The refrigerant pipe leaks.
Insufficient refrigerant circulating in the system decreases the
cooling performance of the air conditioner. Long-term operation
under such circumstance may cause an overheating compressor or
even damage the compressor.
Water drainage from the condensate
water pipe is not smooth.
Residual water in IDUs can affect the normal operation of the
system. The possible water leakage can damage the IDU's
decoration.
The ratio of slop for condensate
water pipe is insufficient or the
condensate water pipe is incorrectly
connected.
Reverse slop or inconsistent connection of condensate water pipe
can hinder the smooth drainage and cause leakage of the IDU.
The air channel is improperly fixed.
The air channel will deform; vibration and noise occur during unit
operating.
The guide vane of air channel is not
reasonably manufactured.
Uneven air quantity allocation reduces the overall performance of
the air conditioner.
The refrigerant pipe or condensate
water pipe does not meet the
insulation requirement.
Water can easily condensate and drip to damage the indoor
decoration, or even trigger the protection mode of system due to
overheating operation.
The installation space for IDU is
insufficient.
Since there is a lack of space for maintenance and checking,
indoor decoration might need to be damaged during such
operation.
The IDU or the location of the air
outlet or return air inlet is not
designed reasonably.
The air outlet or return air inlet may be short-circuited, thus
affecting the air conditioning performance.
The ODU is improperly installed.
The ODU is difficult to be maintained; unit exhaust is not smooth,
which reduces the heat exchanging performance or even prevent
the system from normal operation; in addition, the cold and hot air
for heat exchange and the noise may annoy people in surrounding
areas.
Power cables are incorrectly
provided.
Unit components may be damaged and potential safety hazard
may occur.
Control communication cables are
incorrectly provided or improperly
connected.
The normal communication in the system fails or the control over
IDUs and ODUs turn in a mess.
Control communication cables are
not properly protected.
The communication cables are short-circuited or disconnected,
and the unit cannot be started up due to communication failure.
Understand the special requirement (if any) for unit installation before implementation to ensure
installation quality. Relevant installers must have corresponding engineering construction qualifications.
Special type operators involved in the engineering implementation, such as welders, electricians,
and refrigeration mechanics must have relevant operating licenses and are accredited with vocational
qualification certification.
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