Design piping
General requirements
Proper piping practices should be employed to:
1. Ensure adequate oil return, even under
minimum load conditions (refrigerant speed,
piping slope). 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: “MANAGE
SOUND AND VIBRATION”.
0.5 % slope,
4 m/s or more
0.5 % slope,
4 m/s or more
U-trap
U-trap, as short as possible
U-trap, as short as possible
max. 4 m
fig.1
max. 4 m
8 to 12 m/s
To condenser
Evaporator
Condenser
HP
U-trap
3D flexibility
Upper loop
LP
fig. 2
23
FRCC.PC.012.A7.02
GENER
AL INFORM
ATION
PR
ODUC
T INFORM
ATION
INTEGR
ATION INT
O SY
STEM
ORDERING INFORM
ATION
SY
STEM DESIGN