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Piping Example
Expansion valve
Liquid trap
(Make the bent higher
than the evaporator)
Suction line
Downward
slope
Liquid line
Refrigeration unit
Back-up solenoid valve
(To prevent liquid return operation
during a power failure)
5 m or below
Evaporator
Total piping length should be limited to 100 m one way.
When the piping length exceeds 50 m, add oil refer to “Oil Level Control Method”.
When the evaporator is located higher
■ Height difference 5 m or below
● The suction line should ideally slope gently towards the unit.
Recommendation slope is 1/200~1/250.
● Refrigerant pipe should be covered
with heat insulation material on both
suction line and liquid line.
Since liquid line becomes approx.
0 °C during operation, apply
heat insulation of 20 mm or
more in thickness.
When the evaporator is located lower
■ Height difference 20 m or below
To promote good oil return in the suction line, piping size and trap
need to be considered.
● The suction line should ideally slope gently towards the unit.
Recommendation slope is 1/200~1/250.
● Refrigerant pipe should be covered with heat insulation material
on both suction line and liquid line.
Since liquid line becomes approx. 0 °C during
operation, apply heat insulation of 20 mm or more in
thickness
Refrigeration unit
Downward
slope
Oil trap
Suction line
Downward
slope
6 m or below
20 m or below
Oil trap
Expansion valve
Evaporator
Step
Liquid line
Note:
Adjust refrigerant flow rate to 3.8 m/s or more
in the horizontal suction pipe.
Note:
Oil traps should be installed every 6 meters.
Note:
Adjust refrigerant flow rate to 7.6 m/s or more
in the vertical suction pipe.
Back-up solenoid valve
(To prevent liquid return
operation during a
power failure)
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