CAUTION
Keep the "piping limitation" for correct operation.
Allowable height difference:
z
If the height difference between the indoor unit and outdoor unit is larger than the allowable value:
The pressure loss will be larger → Insufcient cooling and heating
The refrigerant in liquid pipe will ush → Refrigerant ow noise generate at indoor unit
The refrigerant oil will not return → Insufcient refrigerant oil resulting in compressor damage
If the height difference between indoor unit is larger than the allowable value:
The refrigerant ow balance will be poor → Insufcient cooling and heating (poor balance)
Refrigerant oil will collect in the piping or non-operating indoor units
→ Insufcient refrigerant oil resulting in compressor damage
Pipe length:
z
If the pipe length is longer than prescribed:
The pressure loss will be larger → Insufcient cooling and heating
Too much refrigerant will be charged → Liquid backs up resulting in compressor damage
The refrigerant oil will not return → Insufcient refrigerant oil resulting in compressor damage
Pipe size:
z
If the pipe size is larger than designated size:
The refrigerant ow velocity will drop. Refrigerant oil will not return to the outdoor unit.
→ Insufcient refrigerant oil resulting in compressor damage
The refrigerant in liquid pipe will ush easily → Insufcient cooling and heating
If the pipe size is smaller than designated size:
The refrigerant circulation volume will drop → Insufcient cooling and heating
The pressure loss will be larger → Insufcient cooling and heating
Indoor unit connected capacity:
z
If the indoor unit connected capacity is larger than the system capable capacity:
Insufcient system performance → Insufcient cooling and heating
When heating, refrigerant will collect in non-operating indoor units resulting in an insufcient
refrigerant circulation volume → Insufcient cooling and heating
The refrigerant oil will not return → Compressor damage
If the indoor unit connected capacity is too small compared to the system capacity:
The liquid return will be too great → Compressor damage
The refrigerant will concentrate in the operating unit
→ Continuous operation will become difcult due to triggering of the protection in response
to the pressure high-rise, etc., and noise will be generated by the refrigerant ow when heating
- (06 - 16) -
SYSTEM
DESIGN
SYSTEM
DESIGN
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