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Fig. 6.1
Fig. 6.2
Fig. 6.3
Maximum Length and Drop Height of Refrigerant Piping per Unit Model
Model
Capacity (BTU/h)
Max. Length (m)
Max. Drop Height (m)
R410A
& R32
Inverter Split Air
Conditioner
R410A
& R32
Fixed-speed
Split Air Conditioner
< 15,000
25 (82ft)
10 (33ft)
15,000 and < 24,000
30 (98.5ft)
20 (66ft)
24,000 and < 36,000
50 (164ft)
25 (82ft)
18,000 and < 36,000
8(26ft)
< 18,000
20 (66ft)
25 (82ft)
10(33ft)
Oblique
Rough
Warped
90°
Pipe
Reamer
Point down
Flare nut
Copper pipe
1. Cut Pipes
6.2 Refrigerant Piping Connection Instruction
Caution
6. Refrigerant Piping Connection
6.1 Note on Pipe Length
The length of refrigerant piping will affect the performance and energy efficiency of the unit. Nominal efficiency
is tested on units with a pipe length of 5 meters (16.5ft)
.
A minimum pipe run of 3 meters is required to minimise
vibration & excessive noise.
Refer to the table below for specifications on the maximum length and drop height of piping.
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.
3) Make sure that the pipe is cut at a perfect 90° angle. Refer to
Fig. 6.1 for bad cut examples.
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. 6.3.
4)
Remove PVC tape from ends of pipe when ready to perform
flaring work.
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.
Be extra careful not to damage, dent, or deform the pipe while cutting. This will drastically reduce the heating
efficiency of the unit.
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