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Piping installation
Installer and user reference guide
76
BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
WARNING
Bent header or branch pipes can lead to refrigerant leakage.
Possible consequence:
asphyxiation, suffocation and fire.
▪
NEVER bend the branch and header pipes sticking out of the unit. They have to
remain straight.
▪
ALWAYS support the branch and header pipes at a distance of 1 m from the unit.
Prerequisite:
Mount the indoor, outdoor and BS units.
Prerequisite:
Read the instructions in the outdoor unit's manual for information on
how to install piping between the outdoor unit and the BS unit, selecting a
refrigerant branch kit, and installing piping between the refrigerant branch kit and
the BS units.
Prerequisite:
Read the instructions in the indoor unit's manual for information on
how to install piping between the indoor unit and the BS unit.
Prerequisite:
When connecting piping, respect the guidelines for pipe bending and
brazing.
Prerequisite:
Remove the yellow paper from around the header pipes to avoid fire
during brazing.
1
Connect the header pipes to the appropriate field supply pipes. The type of
pipe is indicated on the removed yellow paper. Use a reducing joint
(accessory) if the field supply pipe size does not match the header pipe size of
the BS unit. The diameters of the header pipes of the BS unit are:
▪
Liquid pipe: 15.9 mm
▪
HP/LP gas pipe: 22.2 mm
▪
Suction gas pipe: 22.2 mm
2
If necessary, cut the branch pipes as indicated in the illustration below. The
diameters of the branch pipes of the BS unit are indicated in the illustration.
b
a
Ø 6.35 mm
Ø 9.5 mm
Ø 12.7 mm
Ø 15.9 mm
Ø 9.5 mm
a
Liquid branch pipe
b
Gas branch pipe
3
Connect the branch pipes. The liquid and gas branch pipe diameters to be
used depend on the connected indoor unit capacity class. See to the outdoor
unit’s installation manual.
4
Install stopper pipes (accessory) for unused header pipes (when the BS unit is
not connected in refrigerant flow-through with another BS unit) and unused
branch pipes (when no indoor unit is connected to that branch pipe port).
15.3.2 To braze the pipe end
DANGER: RISK OF BURNING/SCALDING
