System Design; Design Piping; General Requirements - Danfoss DSF090 Application Manuallines

SYSTEM DESIGN

Design piping

General requirements

16
AB367332784529en-000101
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".
0.5% slope
max. 4m 4m/s (13 ft/s)
(13ft) or more
U-trap, as short as possible
8 to 12m/s
(26 to 40ft/s)
max. 4m
(13ft)
0.5% slope
4m/s (13ft/s)
or more
U trap, as short as possible
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
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:
To condenser
Upper loop
HP
LP
HP
LP
Evaporator
mount has been installed. For more information
on noise and vibration, see section on: "Sound
and vibration management".
Condenser
3D exibility