GREE DC Inverter Multi VRF System II Service Manual
62
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.
2 Installation Materials Selection
The materials, equipment and instruments used during air conditioning engineering construction
must have certifications and test reports. Products with fireproof requirements must be provided with
fireproof inspection certificates and must meet national and relevant compulsory standards. If
environmentally-friendly materials are to be used as required by customers, all such materials must meet
national environmental protection requirement and be provided with relevant certificates.
2.1 Refrigerant piping
a. Material requirement: Dephosphorization drawing copper pipe for air conditioners;
b.Appearance requirement: The inner and outer surface of pipe should be smooth without pinhole,
crack, peeling, blister, inclusion, copper powder, carbon deposition, rust, dirt or severe oxide film,
and without obvious scratch, pit, spot and other defects.
c.Test report: Certifications and quality test reports must be provided.
d.The tensile strength must be at least 240 kgf/mm².
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