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SINCLAIR
NOTES：Refrigerant perfusion refer to section 8.
5 Pipes Installation and Insulation
5.1 Pipes Installation for the Cooling System
5.1.1 Processing to Refrigerant Pipes
A 3-meter refrigerant pipe is configured for the unit for standard configuration. If the required
refrigerant pipe is longer than 3 m, it needs to be processed in the steps specified below.
5.1.1.1 Cut-off and Burring
Warning!
Do not use undedicated cutting devices such as a hacksaw.
(1) Use a special-purpose pipe cutter to cut copper pipes.
(2) Cut the pipes gently to ensure that the copper pipe does not deform.
(3) After cutting the pipes, use a slicker to grater bur the pipes with the pipe opening inclining
downward so that the copper scales do not fall into the pipe.
(4) Cover the copper pipe with a sealing cap or adhesive tape to prevent dirt and sundries.
(5) Allowable deviation: Skewness of the cross section cannot exceed 1% of the copper pipe caliber.
5.1.1.2 Pipe Cleaning
(1) Cleaning with a piece of silk cloth (applying to straight pipes)
1) Cleaning with a piece of silk cloth: Wrap a thin steel wire with a piece of clean silk cloth.
Crumple the cloth into a lump with diameter larger than the pipe caliber.
2) Apply several drops of chlorylene to the cloth. Push the cloth in from one end of the pipe
and pull out from the other end.
3) Every time the cloth is pulled out, remove the dust and sundries with chlorylene.
4) Wash repeatedly until the pipe is clean.
(2) Cleaning with nitrogen (applying to coils)
Blow off all dust and sundries in the pipe with nitrogen.
Warning!
After cleaning, cover the both ends of the pipe with a sealing cap or adhesive tape.
5.1.1.3 Pipe Bending
Precautions:
① During bending, there must be no corrugation or deformation inside the pipe.
② The welding point of the pipe should not be at the bending part. The distance between the nozzle
welding joint and the bending part should be less than 100 mm.
AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
Figure 4-3 Vacuum pump connection diagram
29
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