MULTI VRF-Ⅱ INDOOR UNIT SERVICE MANUAL EUROPEAN/LATIN AMETICA (R410A)
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water pipe is incorrectly
connected.
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.
e. Specifications requirement
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