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Branch pipe
Now the refrigerant pipe is installed using branch pipes supplied as accessories.
• Bend and adjust the refrigerant piping so that the branch pipes and pipe after branching become horizontal.
• Fix the branch pipes onto a wall in a ceiling or onto a column.
• Provide a straight pipe longer than 500 mm in length as the main piping of the branches.
Horizontal
Inclination
Air Purging
For the complete information, read the installation instructions for outdoor units of air conditioner.
Additional Refrigerant Amount
<Formula for Calculating Additional Refrigerant Amount>
Do not remove the refrigerant even if the additional refrigerant amount becomes
minus result as a result of calculations by the following formula and operate the
air conditioner as it is.
Additional refrigerant amount (kg) = Main piping additional refrigerant
A:
Additional refrigerant amount per meter of actual main piping length (kg)
B:
Additional refrigerant amount per meter of actual branch piping length (kg)
L:
Actual length of main piping (m)
a, b: Actual length of branch piping (m)
Standard piping length
Main piping
110 AT
18m
140 AT
18m
160 AT
CAUTION
1. Be certain to write the additional refrigerant amount, pipe length (actual
length), head and other specification on the nameplate put on the outdoor unit for recording.
2. Seal the correct amount of additional refrigerant in the system.
Gas Leak Test
• Use a leak detector manufactured specially for the HFC refrigerant (R410A, R134a, etc.) when testing R410A.
The sensitivity of leak detectors for previous HCFC refrigerants (such as R22) lowers to about 1/40 when used with
HFC refrigerants and these detectors cannot be used.
Inclination
amount (kg) + Branch piping additional
refrigerant amount (kg)
= A × (L – 18) + B × (a + b – 4)
Additional refrigerant
amount per Meter (kg/m)
Branch
A
piping
2m
0.040
2m
0.040
Horizontal
Indoor unit B
Branch
piping
B
0.020
0.040
4
Indoor unit A
Branch pipe
a
b
Branch
piping
L
Main
piping
Outdoor unit
H
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