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Refrigerant Piping Work
Cautions for Heat Insulation Work
● Apply heat insulation on the suction line and liquid line for avoiding thermal effect from outside.
● Do not wrap together the suction line and liquid line with heat insulation material.
(Refer to the right illustration)
● Apply heat insulation only after executing airtight and pressure test.
Prevent contamination of foreign objects such as dust, metal powder, oxide scale,
etc.
Since the compressor consists of high precision components, contaminants generate scratches on the sliding
surfaces, thereby increasing gas leak, deteriorating performance, and causing excessive wear and seizure.
● Flow nitrogen gas during welding.
● Piping inside and outside must be clean.
● Avoid mixing of debris during cutting
and deburring copper pipe.
Airtight Test
Pressure testing should only be carried out
by personal / companies who have necessary
certifi cation.
Consider carefully local regulations and EN378.
Design pressure in Factory
High pressure side
12MPa
Caution for Gas Leak
Gas leak may lead to excessive heat operation of
compressor and air-mixed operation, thus causing
compressor failure.
Securely execute airtight test.
N
cylinder
2
Low pressure side
8MPa
Brazing position
Fill the gap with sealing material.
Open gap may cause air to be mixed.
Piping Direction
The pipe can be connected from 3 directions (front,
back, or right side of the unit).
When connecting the refrigerant pipe, remove the
right side panel.
Filter Dryer
Be sure to attach the included fi lter dryer.
Model No. D-152T (Type: CO-082-S)
EN - 18
Liquid line
Suction line
Correct
Incorrect
Apply dry nitrogen gas flow
barely felt by the palm.
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