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Notions on refrigerant piping connection
6 NOTIONS ON REFRIGERANT PIPING CONNECTION
The length of the refrigerant pipes affects performance and energy efficiency of the unit. The nominal efficiency is tested
on units whose pipes are 5 meters long.
For tropical areas, the maximum length of the refrigerant pipe must not exceed 10 metres.
6.1 Refrigerant piping connections
l
WARNING
– The branch lines must be insulated
separately
– It is advisable to use pipes with a minimum
length of 3 metres to minimise noise and
vibrations.
a
CAUTION DANGER
– The Y joint must be installed horizontally.
An angle of more than 10° can cause
malfunctions.
– DO NOT install the connection pipe before
installing both the indoor and outdoor units.
– Insulate the gas side and liquid side pipes to
prevent water leaks.
Wires between the units
Gas pipe
Liquid pipe
Finishing tape
Flexible drain hose
Liquid pipe
insulation
Gas pipe
insulation
Fig. 25
Gas pipe insulation: minimum thickness 13mm
Liquid pipe insulation: minimum thickness 10mm
6.1.1 Cut the pipes
When preparing the refrigerant pipes, take great care
to cut and flare them correctly. This will ensure efficient
operation and reduce the need for further maintenance.
For units with R32 refrigerant, the pipe connection
points must be outside the room.
1 Measure the distance between the indoor and
outdoor unit.
2 Using a pipe cutter, cut the pipe to a measurement
slightly longer than the measured distance.
3 Check that the pipe is cut at an exact 90° angle. Refer
to the examples of incorrect cutting contained in
“Fig. 26”.
90°
Oblique Irregular Corrugated
Fig. 26
m
CAUTION
– Do not damage, tighten or deform the pipe
during cutting. This would greatly reduce
the heating efficiency of the unit.
6.1.2 Eliminate smudges
Deburring can make the refrigerant piping connection
seal less effective. For this reason, they must be
eliminated completely.
1 Keep the pipe tilted downwards to prevent debris
residue from falling into the pipe.
2 Using a reamer or similar tool, remove all burrs from
the cut section of the pipe.
Pipe
Reamer
Tilt downward
Fig. 27
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