14 Piping installation
Installation and operation manual
21
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P546222-1B – 2020.10
b
Front connection
c
Right-side connection
For side connections, the knockout hole on the bottom plate should
be removed:
c
b
a
a
Large knockout hole
b
Drill
c
Points for drilling
NOTICE
Precautions when making knockout holes:
▪ Avoid damaging the casing.
▪ After making the knockout holes, we recommend you
remove the burrs and paint the edges and areas
around the edges using repair paint to prevent rusting.
▪ When passing electrical wiring through the knockout
holes, wrap the wiring with protective tape to prevent
damage.
14.2.2
To connect the refrigerant piping to the
outdoor unit
NOTICE
▪ Be sure to use the supplied accessory pipes when
carrying out piping work in the field.
▪ Be sure that the field installed piping does not touch
other pipes, the bottom panel or side panel. Especially
for the bottom and side connection, be sure to protect
the piping with suitable insulation, to prevent it from
coming into contact with the casing.
Connect the stop valves to the field piping using the accessory pipes
supplied with the unit.
The connections to the branch kits are the responsibility of the
installer (field piping).
14.2.3
To connect the multi connection piping kit
NOTICE
Improper installation may lead to malfunction of the
outdoor unit.
▪ Install the joints horizontally, so that the caution label (a) attached
to the joint comes to the top.
▪ Do not tilt the joint more than 7.5° (see view A).
▪ Do not install the joint vertically (see view B).
a
a
A
B
7.5°
7.5°
a
Caution label
NOT allowed
Allowed
▪ Make sure that the total length of the piping connected to the joint
is absolute straight for more than 500 mm. Only if a straight field
piping of more than 120 mm is connected, more than 500 mm of
straight section can be ensured.
>120 mm
>500 mm
14.2.4
To connect the refrigerant branching kit
For installation of the refrigerant branching kit, refer to the installation
manual delivered with the kit.
▪ Mount the refnet joint so that it branches either horizontally or
vertically.
▪ Mount the refnet header so that it branches horizontally.
A
B
±
3
0°
a
b
c
a
a
Horizontal surface
b
Refnet joint mounted vertically
c
Refnet joint mounted horizontally
14.2.5
To protect against contamination
Seal the piping and wiring intake holes using sealing material (field
supply), otherwise the capacity of the unit will drop and small
animals may enter the machine.
14.2.6
Using the stop valve and service port
To handle the stop valve
Take the following guidelines into account:
▪ Make sure to keep all stop valves open during operation.
▪ The gas and liquid stop valves are factory closed.
▪ Do NOT apply excessive force to the stop valve. Doing so may
break the valve body.
To open the stop valve
1
Remove the stop valve cover.
2
Insert a hexagon wrench into the stop valve and turn the stop
valve counterclockwise.
