25
CONNECTING REFRIGERANT PIPING LINES (Cont.)
INSTRUCTIONS FOR CONNECTIING REFRIGERANT PIPING LINES (Cont.)
The minimum radius of bending must not
be less than 100 mm to avoid damage of
tubing.
Once the tubing is bent, the installer must
not unbend at the same point as this
causes work hardening of copper tubing
and makes it more difficult to reshape
Avoid disconnecting refrigerant
connections after they have been tightened
to avoid refrigerant leaks.
When there is excessive tubing, it must be
coiled horizontally so that the flow of
refrigerant is from the top to bottom of the
coil and towards the outdoor unit.
The excessive tubing must not be coiled
vertically since the vertical coil affects the
oil return to the compressor.
For bends having a radius smaller than 300
mm, the use of a tuber bender with a
minimum wheel diameter of 120 mm is a
must.
The tube bender wheel grooves should
have the same diameters as the refrigerant
pipes.
Avoid excessive number of bends in
refrigerant piping lines during connections
with both the indoor and outdoor units.
This is to avoid reduction of cooling
efficiency.
Bends with tube diameter bigger than ½” or
a bending radius than 300 mm should be
made with a dime. Having this radius.
Radius of Bending
Excessive tubing
must be coiled
horizontally
Summary of Contents for 42QG18-C
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