Preparation Before Installation; Notices For Installation Engineering; Safety Requirements For Installation Engineering; Importance Of Installation Engineering - Gree GMV-S120WL/A-S Service Manual

3.Preparation before Installation

3.1Notices for Installation Engineering

3.1.1Safety requirements for installation engineering

Warning! All personnel involved in the installation must attend safety education
courses and pass corresponding safety examinations before installation. Only qualified personnel
can attend the installation. Relevant personnel must be held responsible for any violation of the
regulation.
Warning! Personnel and property safety are highly concerned during the entire
installation process. Installation implementation must abide by relevant national safety regulations
to ensure personnel and property safety.

3.1.2 Importance of installation engineering

VRF air conditioning systems use refrigerant, instead of other agent, to directly evaporate to
carry out the system heat. High level of pipe cleanness and dryness is required in the system.
When preparing and laying out various pipes onsite, if impurities, water, or dust is still inside
refrigerant pipes or there is impurities and air inside the water system pipeline due to improper
installation, various problems may occur in the system or even lead to system breakdown.
Problems that usually occur during installation are as follows:
No. Installation Problem
Dust or impurities enter into the
1
refrigeration system.
Nitrogen is not filled into the refrigerant
2 pipe or insufficient nitrogen is filled
before welding.
The vacuum degree in the refrigerant
3
pipe is insufficient.
Water enters into the refrigeration
4
pipe.
The refrigerant pipe specifications do
5 not meet the configuration
requirements.
6 Refrigerant pipe is blocked.
7 Refrigerant pipe exceeds the limit.
8 Incorrect amount of refrigerant is filled.
9 The refrigerant pipe leaks.
Water drainage from the condensate
10
water pipe is not smooth.
The ratio of slop for condensate water
11 pipe is insufficient or the condensate
water pipe is incorrectly connected.
12 The air channel is improperly fixed.
GMV5 Home DC Inverter Multi VRF Units
Pipes are blocked; air conditioning performance is reduced;
compressor wear is increased or even hinder the normal
operation of the system and burn the compressor.
Pipes are blocked; air conditioning performance is reduced;
compressor wear is increased or even hinder the normal
operation of the system and burn the compressor.
The refrigeration performance is reduced. The system fails to
keep normal operation due to frequent protection measures.
When the problem getting serious, compressor and other major
components can be damaged.
Copper plating may appear on the compressor and reduce the
compressor efficiency with abnormal noise generated; failures
may occur in the system due to ice plug.
Smaller configuration specifications can increase the system pipe
resistance and affect the cooling performance; larger
configuration specifications are waste of materials and can also
reduce the cooling performance.
The cooling performance is reduced; in certain cases, it may
cause long-term compressor operating under overheat
conditions; the lubricating effect can be affected and the
compressor may be burnt if impurities were mixed with the
lubricating oil.
The loss in pipe is considerable and the unit energy efficiency
decreases, which are harmful for long-term running of the
system.
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.
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.
Residual water in IDUs can affect the normal operation of the
system. The possible water leakage can damage the IDU's
decoration.
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.
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Possible Consequence