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Refrigerant Piping
Connection
Table 7.2
Permitted length
Piping
length
Total piping length
18K+18K 30m/98’
L+Max
(L1, L2)
24K+24K
30K+30K
50m/164’
(farthest distance from
the line pipe branch)
15m/49’
L1, L2
(farthest distance from
the line pipe branch)
10m/32.8’
L1-L2
Drop
height
Drop height between
indoor and outdoor unit
20m/65.6’
H1
Drop height between
two indoor units
0.5m/1.6’
H2
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. 7.4 for examples of bad cuts
Oblique
Rough
Warped
90°
Fig. 7.4
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 down
Fig. 7.5
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. 7.6
Flare nut
Copper pipe
Fig. 7.6
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. 7.7
Summary of Contents for PSKM 18HI
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