GREE Photovoltaic Direct-driven Inverter Multi VRF Units
18
No. Installation Problem Possible Consequence
10
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.
11
e 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.
12
el is improperly fixed. The air channel will deform; vibration and noise occur during unit operating.
13
The guide vane of air channel is not
reasonably manufactured.
Uneven air quantity allocation reduces the overall performance of the air
14
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.
15
n space for IDU is
Since there is a lack of space for maintenance and checking, indoor
decoration might need to be damaged during such operation.
16
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.
17
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.
18
Power cables are incorrectly
provided.
Unit components may be damaged and potential safety hazard may occur.
19
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.
20
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.
1.3 Cooperation between Different Professions
A quality installation of air conditioning engineering depends on careful organization and close
cooperation between different professions such as architecture, structure, electric, water supply and
drainage, fire-fighting, and decoration. Pipes must be laid in places away from any automatic spray head
for fire-fighting, and must be reasonably arranged to ensure that the pipes fit the electric, luminaries, and
decoration.
1.3.1 Requirements for cooperation with civil engineering
(1) The riser should be installed in the air conditioning tube well, and the horizontal pipe should be
placed in the ceiling, if possible.
(2) A place should be reserved for the ODU base to prevent the waterproof layer or insulating layer
on the roof from being damaged in later phase of installation.
(3) At places on walls or floors where pipes need to go through, holes or casing should be preserved.
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