HTW IX43 R32 Manuel D'installation page 47

Refrigerant Piping Connection Instructions
CAUTION
The branching pipe must be installed
•
horizontally. An angle of more than 10° may
cause malfunction.
DO NOT install the connecting pipe until
•
both indoor and outdoor units have been
installed.
Insulate both the gas and liquid piping to
•
prevent water leakage.
Step1: Cut pipes
When preparing refrigerant pipes, take
extra care to cut and flare them properly.
This will ensure efficient operation and
minimize the need for future maintenance.
1. Measure the distance between the indoor
and outdoor units.
2. Using a pipe cutter, cut the pipe a little
longer than the measured distance.
CAUTION
DO NOT deform pipe while cutting. Be extra
careful not to damage, dent, or deform the
pipe while cutting. This will drastically reduce
the
heating efficiency of the unit.
1. Make sure that the pipe is cut at a perfect
90° angle. Refer to Fig. 7.1 for examples of
bad cuts.
90°
Oblique
Fig. 7.1
Rough
Warped
45
Step 2: Remove burrs.
Burrs can affect the air-tight seal of
refrigerant piping connection. They must be
completely removed.
1. Hold the pipe at a downward angle to
prevent burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove
all burrs from the cut section of the pipe.
Point down
Fig. 7.2
Step 3: Flare pipe ends
Proper flaring is essential to achieve an
airtight seal.
1. After removing burrs from cut pipe, seal
the ends with PVC tape to pr event foreign
materials from entering the pipe.
2. Sheath the pipe with insulating material.
Place flare nuts on both ends of pipe.
3.
Make sure they are facing in the right
direction, because you can't put them on
or change their direction after flaring.
See Fig. 7.3
Flare nut
Copper pipe
Fig. 7.3
4. Remove PVC tape from ends of pipe when
ready to perform flaring work.
5. Clamp flare form on the end of the pipe.
The end of the pipe must extend beyond
the flare form.
Flare form
Fig. 7.4
Pipe
Reamer
Pipe