Installation Materials Selection; Refrigerant Piping - Gree GMV-ND07PLS/A-T(U) Service Manual

The ratio of slop for
condensate water pipe is
11 insufficient or the
condensate water pipe is
incorrectly connected.
The air channel is
12
improperly fixed.
The guide vane of air
13 channel is not reasonably
manufactured.
The refrigerant pipe or
condensate water pipe
14
does not meet the
insulation requirement.
The installation space for
15
IDU is insufficient.
The IDU or the location of
the air outlet or return air
16
inlet is not designed
reasonably.
The ODU is improperly
17
installed.
Power cables are
18
incorrectly provided.
Control communication
cables are incorrectly
19
provided or improperly
connected.
Control communication
20 cables are not properly
protected.
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.
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

(1) Material requirement: Dephosphorization drawing copper pipe for air conditioners;
(2) 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.
(3) Test report: Certifications and quality test reports must be provided.
(4) The tensile strength must be at least 240 kgf/mm² .
Multi Variable Air Conditioners Indoor Unit for North America
Reverse slop or inconsistent connection of condensate water pipe can hinder the
smooth drainage and cause leakage of the IDU.
The air channel will deform; vibration and noise occur during unit operating.
Uneven air quantity allocation reduces the overall performance of the air
conditioner.
Water can easily condensate and drip to damage the indoor decoration, or even
trigger the protection mode of system due to overheating operation.
Since there is a lack of space for maintenance and checking, indoor decoration
might need to be damaged during such operation.
The air outlet or return air inlet may be short-circuited, thus affecting the air
conditioning performance.
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.
Unit components may be damaged and potential safety hazard may occur.
The normal communication in the system fails or the control over IDUs and ODUs
turn in a mess.
The communication cables are short-circuited or disconnected, and the unit
cannot be started up due to communication failure.
71
If