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10
installation manual
Refrigerant Piping Connection Instructions
CAUTION
•The branching pipe must be installed horizontall y.
An angle of mo re 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 p revent
water leakage.
Step1: Cut pipes
When p reparing refrigerant pipes, take extra ca re
to cut and fla re them properly. This will ensu re
efficient operation and minimize the need for futu re
maintenance.
1. Measure the distance between the indoor and
outdoor units.
2. Using a pipe cutte r, cut the pipe a little longer than
the measured distance.
CAUTION
DO NOT deform pipe while cutting. Be extra ca reful not
to damage, dent, or deform the pipe while cutting. This
will drastically reduce the heating efficiency of the unit.
1. Make su re that the pipe is cut at a perfect 90°
angle. Refer to Fig. 8.1 for examples of bad cuts
Oblique
Roug h
Warpe d
90°
Fig. 8.1
Step 2: Remove burrs.
Burrs can a ffect the ai r-tight seal of refrigerant piping
connection. They must be completely removed.
1. Hold the pipe at a downwa rd angle to p revent
burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove all burrs
from the cut section of the pipe.
Pipe
Reamer
Point dow n
Fig. 8.2
Step 3: Fla re pipe ends
Proper flaring is essential to achieve an airtight seal.
Flare nut
Copper pipe
Fig. 8.3
4. Remove PVC tape from ends of pipe when ready to
perform flaring work.
5. Clamp fla re form on the end of the pipe. The end
of the pipe must extend beyond the fla re form.
Flare form
Pipe
Fig. 8.4
1. After removing burrs from cut pipe, seal the ends
with PVC tape to prevent foreign materials from
entering the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe. Make su re
they are facing in the right di rection, because you
can’t put them on or change their di rection after
flaring. See Fig. 8.3
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