14 Piping installation
Installation and operation manual
30
BS4~12A14AJV1B
VRV 5 branch selector unit
4P670163-1 – 2022.02
a
BS unit
b
Liquid pipe (field supply)
c
HP/LP gas pipe (field supply)
d
Suction gas pipe (field supply)
e
Reducing joints and insulation tubes (accessory)
f
Indoor unit connection set
g
Liquid pipe (field supply)
h
Gas pipe (field supply)
WARNING
Bent header or branch pipes can lead to refrigerant
leakage. Risk of 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:
When connecting piping, respect the guidelines for
pipe bending and brazing.
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:
Mount the indoor, outdoor and BS units.
1
Connect the header pipes. 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 put in refrigerant flow-through with
another BS unit) and unused branch pipes (when no indoor unit
is connected to that branch pipe port).
5
In case of stopper pipes: install stopper pipe insulation tubes
(accessory). Adding additional insulation might be required
depending on the ambient conditions. Follow the rules for the
total minimum insulation thickness.
▪ Attach an insulation tube against the tube on the BS unit.
▪ Apply a tape to close the seam so that air does not enter.
c
e
f
b
d
a
a
Insulation tube (accessory)
b
Cut surface (branch pipes only)
c
Tape (field supply)
d
Insulation tube (attached to the BS unit)
e
BS unit
f
Adherence surface
To insulate the header and branch pipes (standard insulation)
The header pipes and branch pipes MUST be insulated (field
supply). Make sure that the insulation is properly mounted over the
header and branch pipes of the unit as shown in the image below.
Always use tape (field supply) to prevent air gaps in the seam
between the insulation tubes.
b
e
c
a
d
a
Insulation tube (field supply)
b
Tape (field supply)
c
Insulation tube (BS unit)
d
Adherence surface
e
BS unit
1
Install an insulation tube (a) over the pipe and against the
insulation tube (c) on the BS unit.
2
Apply tape (b) to close the seam.
To insulate the header and branch pipes (extra insulation)
Depending on ambient conditions (see
29]), it can be required to add extra insulation material.
Make sure that the insulation is properly mounted over the header
and branch pipes of the unit as shown in the image below. In order
to level out the difference in thickness, an extra insulation tube must
be installed over the insulation tube coming out of the unit. Always
use tape (field supply) to prevent air gaps in the seam between the
insulation tubes.
e
d
d
a
b
c f
a
Insulation tube (extra thick)(field supply)
b
Tape (field supply)
c
Insulation tube (BS unit)
d
Adherence surface
e
BS unit
f
Insulation tube for levelling out thickness (field supply)
3
Install an insulation tube (a) over the pipe and against the
insulation tube (c) on the BS unit.
4
Attach an extra layer of insulation tube (d) to level out the
thickness.
5
Apply tape (b) to close the seam.
