14 Piping installation
Installation and operation manual
21
RK RKXYQ8T7Y1B
VRV IV compressor unit for indoor installation
4P499900-1B – 2021.12
Tightening torques
Stop valve
size (mm)
Tightening torque N•m (turn clockwise to close)
Shaft
Valve body Hexagonal
wrench
Cap (valve
lid)
Service
port
Ø9.5
5.4~6.6
4 mm
13.5~16.5
11.5~13.9
Ø12.7
8.1~9.9
18.0~22.0
Ø19.1
27.0~33.0
8 mm
22.5~27.5
14.2.2
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.
You have to recover gas and oil from all 4 pinched pipes. Depending
on your available tools, use method 1 (manifold with refrigerant line
splitters required) or method 2.
Manifold
Connections
Compressor unit
p< p>
e
B
A
Method 1:
Connect to all service
ports at once.
C
a
b
A
c
d
B
C
C
C
D
D
RDXYQ
RDXYQ
c
c
d
d
b
b
a
a
5 HP
8 HP
Method 2:
First connect to the
first 2 service ports.
C
C
b
B
a
A
Then connect to the
last 2 service ports.
d
B
c
A
C
C
a, b, c, d
Service ports of stop valves
e
Vacuuming/recovery unit
A, B, C
Valves A, B and C
D
Refrigerant line splitter
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 gas and liquid stop valve pipes
along the black line. Use an appropriate tool (e.g. a pipe cutter).
WARNING
NEVER remove the pinched piping by brazing.
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
6
Wait until all oil has dripped out before continuing with the
connection of the field piping in case the recovery was not
complete.
14.2.3
To connect the refrigerant piping to the
compressor 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.
1
Remove the service cover. See
2
Choose a piping route (a or b).
b
a
a
a
To the back
b
To the top
3
If you have chosen the piping route to the top:
