Piping Example - Panasonic OCU-CR200VF5 Operating Instructions And Installation Instructions

Piping Example

Total piping length should be limited to 25 m one way.
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 10 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.
Note: Oil trap should be installed 5 meters or below.
Note: Adjust refrigerant fl ow rate to 7.6 m/s or more
in the vertical suction pipe. To promote good oil
return in the suction line.
Note: Adjust refrigerant fl ow rate to 3.8 m/s or more in the horizontal
suction pipe. To promote good oil return in the suction line.
Liquid trap
(Make the bent higher
than the evaporator)
Refrigeration unit
Liquid line
Liquid line
EN - 19
Expansion valve
Suction line
Back-up
Downward
solenoid
slope
valve
Refrigeration unit
Suction line
Downward slope
Step
Expansion valve
Oil trap
Back-up solenoid valve
Evaporator
Downward slope
Oil trap
Evaporator