14 Piping installation
Installation and operation manual
22
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1D – 2020.10
▪ 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
X
Not allowed
O
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
14.3.4
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
14.3.5
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.
14.3.6
Using the stop valve and service port
To handle the stop valve
Take the following guidelines into account:
▪ Make sure to keep the appropriate stop valves open during
operation. In case of heat pump system, the gas suction stop
valve remains in the closed position.
▪ 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.
3
When the stop valve cannot be turned any further, stop turning.
4
Install the stop valve cover.
Result:
The valve is now open.
To fully open the Ø19.1~Ø25.4 mm stop valve, turn the hexagonal
wrench until a torque between 27 and 33 N•m is achieved.
Inadequate torque may cause leakage of refrigerant and breakage of
the stop valve cap.
To close the stop valve
1
Remove the stop valve cover.
2
Insert a hexagon wrench into the stop valve and turn the stop
valve clockwise.
3
When the stop valve cannot be turned any further, stop turning.
4
Install the stop valve cover.
Result:
The valve is now closed.
To handle the stop valve cover
▪ The stop valve cover is sealed where indicated by the arrow. Do
NOT damage it.
▪ After handling the stop valve, tighten the stop valve cover
securely, and check for refrigerant leaks. For the tightening
torque, refer to the table below.
