Pipe Length - Fujitsu AU*G36LRLA Design & Technical Manual

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 → Insufficient cooling and heating
*The refrigerant in liquid pipe will flush → Refrigerant flow noise generate at indoor unit
*The refrigerant oil will not return → Insufficient refrigerant oil resulting in compressor damage
If the height difference between indoor unit is larger than the allowable value:
*The refrigerant flow balance will be poor → Insufficient cooling and heating (poor balance)
*Refrigerant oil will collect in the piping or non-operating indoor units

Pipe length:

z „
If the pipe length is longer than prescribed:
*The pressure loss will be larger → Insufficient cooling and heating
*Too much refrigerant will be charged → Liquid backs up resulting in compressor damage
*The refrigerant oil will not return → Insufficient refrigerant oil resulting in compressor damage
Pipe size:
z „
If the pipe size is larger than designated size:
*The refrigerant flow velocity will drop. Refrigerant oil will not return to the outdoor unit.
*The refrigerant in liquid pipe will flush easily → Insufficient cooling and heating
If the pipe size is smaller than designated size:
*The refrigerant circulation volume will drop → Insufficient cooling and heating
*The pressure loss will be larger → Insufficient cooling and heating
→ Insufficient refrigerant oil resulting in compressor damage
→ Insufficient refrigerant oil resulting in compressor damage
- (05-04) -