CAUTION
Keep the "piping limitation" for correct operation.
z
Allowable height dierence:
If the height dierence between the indoor unit and outdoor unit is larger than the allowable value:
¾
The pressure loss will be larger → Insucient cooling and heating
¾
The refrigerant in liquid pipe will ush → Refrigerant ow noise generate at indoor unit
¾
The refrigerant oil will not return → Insucient refrigerant oil resulting in compressor damage
If the height dierence between indoor unit is larger than the allowable value:
¾
The refrigerant ow balance will be poor → Insucient cooling and heating (poor balance)
¾
Refrigerant oil will collect in the piping or non-operating indoor units
→ Insucient refrigerant oil resulting in compressor damage
z
Pipe length:
If the pipe length is longer than prescribed:
¾
The pressure loss will be larger → Insucient cooling and heating
¾
Too much refrigerant will be charged → Liquid backs up resulting in compressor damage
¾
The refrigerant oil will not return → Insucient refrigerant oil resulting in compressor damage
z
Pipe size:
If the pipe size is larger than designated size:
¾
The refrigerant ow velocity will drop. Refrigerant oil will not return to the outdoor unit.
→ Insucient refrigerant oil resulting in compressor damage
¾
The refrigerant in liquid pipe will ush easily → Insucient cooling and heating
If the pipe size is smaller than designated size:
¾
The refrigerant circulation volume will drop → Insucient cooling and heating
¾
The pressure loss will be larger → Insucient cooling and heating
z
Indoor unit connected capacity:
If the indoor unit connected capacity is larger than the system capable capacity:
¾
Insucient system performance → Insucient cooling and heating
¾
When heating, refrigerant will collect in non-operating indoor units resulting in an insucient
refrigerant circulation volume → Insucient cooling and heating
¾
The refrigerant oil will not return → Compressor damage
If the indoor unit connected capacity is too small compared to the system capacity:
¾
The liquid return will be too great → Compressor damage
¾
The refrigerant will concentrate in the operating unit
→ Continuous operation will become dicult 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 - 15) -
SYSTEM
DESIGN
SYSTEM
DESIGN
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