Cooper & Hunter CHV-5S224SNMX, Service Manual

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0 51 INSTALLATION
CHV
5 COM PACT MULTI VRF UNIT
SERVICE M ANUAL
2.1 Installation notice
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.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.
2.2 Installtion key points and importance
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. Since various pipes need to be
prepared and laid out onsite, carelessness or maloperation during installation may leave impur ities, water, or dust
inside refrigerant pipes. If the design fails to meet the requirement,various problems may occur in the system o r
even lead to system breakdown.
Problems that usually occur during installation are as follows:
No. Installation problem
Possible Consequence
1
Dust or impurities enter into the
refrigeration system
Pipes are more likely to be blocked; air conditioning performance is
reduced; compressor wear is increased or even hinder the normal
operation of the system and burn the compressor.
2
Nitrogen is not filled into the
refrigerant pipe or insufficient
Nitrogen is filled before
welding.
Pipes are more likely to be blocked; air conditioning performance is
reduced;compressor wear is increased or even hinder the normal
operation of the system and burn the compressor
3
The vacuum degree in the
refrigerant pipe is insufficient
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.
4
Water enters into the
refrigeration system
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
5
The refrigerant pipe
specifications do not meet the
configuration requirements
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
6 Refrigerant pipe is blocked.
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