14 Piping installation
Installation and operation manual
22
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P546222-1B – 2020.10
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.
NOTICE
Pay attention that mentioned torque range is applicable for
opening Ø19.1~Ø25.4 mm stop valves only.
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.
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) (when opening or
closing)
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
14.2.7
To remove the spun pipes
WARNING
Any gas or oil remaining inside the stop valve may blow off
the spun piping.
If these instructions are NOT followed correctly it may
result in property damage or personal injury, which may be
serious depending on the circumstances.
Use the following procedure to remove the spun 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.
p< p>
R410A
N2
b
c
e
a
f
g
h
d
A
C
D
B
a
Pressure reducing valve
b
Nitrogen
c
Weighing scales
d
Refrigerant R410A tank (siphon system)
e
Vacuum pump
f
Liquid line stop valve
g
Gas line stop valve
h
High pressure/low pressure gas line stop valve
A
Valve A
B
Valve B
C
Valve C
D
Valve D
3
Recover gas and oil from the spun piping by using a recovery
unit.
CAUTION
Do not vent gases into the atmosphere.
4
When all gas and oil is recovered from the spun 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).
Summary of Contents for REYQ8U7Y1B
Page 51: ......
