York YKKE Series, Installation Manual

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Refrigerant Piping
Connection
Refrigerant Piping Connection Instructions
CAUTION
s The branching pipe must be installed horizontally.
An angle of more than 10° may cause malfunction.
s DO NOT install the connecting pipe until both
indoor and outdoor units have been installed.
s 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. 7.2 for examples of bad cuts
Oblique Rough Warped
90°
Fig. 7.2
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.
Pipe
Reamer
Point dow n
Fig. 7.3
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 prevent foreign materials from
entering the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe. Make sure
they are facing in the right direction, because you
can’t put them on or change their direction after
flaring. See Fig. 7.4
Flare nut
Copper pipe
Fig. 7.4
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
Pipe
Fig. 7.5