10T8Y1B
VRV-W IV System Air Conditioner
4P399208-1 – 2015.01
Installation and operation manual
17
1
Install the joints horizontally, so that the caution label (1)
attached to the joint comes to the top.
-
Do not tilt the joint more than 15° (see view A).
-
Do not install the joint vertically (see view B).
2
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.
3
Improper installation may lead to malfunction of the outdoor
unit.
10.3. Guidelines for handling stop valve
10.3.1 Cautions on handling the stop valve
Make sure to keep appropriate stop valves open during
operation.
The figure below shows the name of each part required in
handling the stop valve.
The stop valve is factory closed.
A
Heat pump system (2-pipe)
B
Heat recovery system (3-pipe)
1
Used stop valves
2
Service port and service port cover
3
Field piping connection (accessory)
4
Blind flange
5
Unused stop valve
1
Service port
2
Cap
3
Hexagon hole
4
Shaft
5
Seal
10.3.2 How to use the stop valve
Opening the stop valve
1
Remove the 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.
The valve is now open.
To fully open the Ø19.1 or Ø25.4 gas line 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.
Closing the stop valve
1
Remove the 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.
The valve is now closed.
10.3.3 Cautions on handling 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.
10.3.4 Cautions on handling 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.
10.3.5 Tightening torques
2
1
1
2
2
2
2
2
4
5
B
A
3
3
3
4
5
3
2
1
NOTICE
Pay attention that mentioned torque range is applicable for
opening Ø19.1 and Ø25.4 gas line stop valves only.
Stop valve
size
Tightening torque N•m (turn clockwise to close)
Shaft
Valve
body
Hexagonal
wrench
Cap
(valve lid)
Service
port
Flare nut
Gas side
accessory
pipe
Liquid side
5.4~6.6
4 mm
13.5~16.5
11.5~13.9
32,7
-
Gas side
27.0~33.0
10 mm
36.0~44.0
-
22-28
1
2
3
4