5 Installation
Installation and operation manual
11
8T7Y1B
VRV IV compressor unit for indoor installation
4P408443-1B – 2016.04
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.
Result:
The valve is now open.
To fully open the Ø19.1 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.
1
2
3
4
NOTICE
Pay attention that mentioned torque range is applicable for
opening Ø19.1 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.
Result:
The valve is now closed.
Closing direction:
To handle the stop valve cover
▪ The stop valve cover is sealed where indicated by the arrow. Take
care not to damage it.
▪ After handling the stop valve, make sure to tighten the stop valve
cover securely. For the tightening torque, refer to the table below.
▪ Check for refrigerant leaks after tightening the stop valve cover.
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 (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
5.3.2
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
Remove the valve cover and make sure that the stop valves are
fully closed.
c
d
a
b
a
Service port and service port cover
b
Stop valve
c
Field piping connection
d
Stop valve cover
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.
Summary of Contents for VRV IV RKXYQ8T7Y1B
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