15 Piping installation
Installation and operation manual
32
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P684060-1 – 2022.02
▪ 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
d
a
a
Horizontal surface
b
Refnet joint mounted vertically
c
Refnet joint mounted horizontally
d
Header
15.2.5
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.
15.2.6
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 dust cap.
2
Insert a hexagon wrench into the stop valve.
3
FULLY turn the stop valve counterclockwise and tighten until
the correct tightening torque value is achieved (see
32]).
NOTICE
Stop valves need to be opened on torque specified in this
manual. It is not allowed to turn valve "a quarter turn" back
when opening it.
4
Install the dust cap.
Result:
The valve is now open.
NOTICE
Reinstall dust cap to prevent aging of O-ring and risk of
leakage.
To handle the service port
▪ Always use a charge hose equipped with a valve depressor pin,
since the service port is a Schrader type valve.
▪ After handling the service port, make sure to tighten the service
port cover securely. For the tightening torque, refer to the table
below.
▪ Check for refrigerant leaks after tightening the service port cover.
Tightening torques
Stop valve
size [mm]
Tightening torque [N•m]
(a)
Valve body
Hexagonal
wrench
Service port
Ø9.5
5~7
4 mm
10.7~14.7
Ø12.7
8~10
Ø15.9
14~16
6 mm
Ø19.1
19~21
8 mm
Ø25.4
(a)
When opening or closing.
15.2.7
To remove the pinched pipes
WARNING
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
Failure to observe the instructions in procedure below
properly may result in property damage or personal injury,
which may be serious depending on the circumstances.
Use the following procedure to remove the pinched piping:
1
Make sure that the stop valves are fully closed.
2
Connect the vacuuming/recovery unit through a manifold to the
service port of all stop valves.
a
a
b
b
a
Service port
b
Stop valve
3
Recover gas and oil from the pinched piping by using a
recovery unit.
CAUTION
Do NOT vent gases into the atmosphere.
4
When all gas and oil is recovered from the pinched piping,
disconnect the charge hose and close the service ports.
5
Cut off the lower part of the liquid-, gas-, and high pressure/low
pressure gas stop valve pipes along the black line. Use an
appropriate tool (e.g. a pipe cutter).
