Piping Design
General requirements
Proper piping practices should be employed to:
1. Ensure adequate oil return, even under
minimum load conditions (refrigerant speed,
piping slopes…). For validation tests see section
“Manage oil in the circuit”.
2. Avoid condensed liquid refrigerant from
draining back to the compressor when stopped
(discharge piping upper loop). For validation
tests see section “Manage off cycle migration”.
General recommendations are described in the
figures below:
3. Piping should be designed with adequate
three-dimensional flexibility to avoid excess
vibration. It should not be in contact with the
surrounding structure, unless a proper tubing
mount has been installed.
For more information on noise and vibration, see
section on: “Sound and vibration management”.
HP
4 m/s (13 ft/s)
or more
0.5% slope
To condenser
max. 4 m (13ft)
max. 4 m (13ft)
0.5% slope
U-trap,
as short as possible
4m/s (13 ft/s) or more
U trap, as short as possible
Evaporator
LP
8 to 12 m/s
(26 to 40 ft/s)
HP
LP
Condenser
3D flexibility
Upper loop
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