Specifications

RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
Installation and operation manual
19
10.3. Guidelines for handling stop valve
10.3.1. Cautions on handling the stop valve
 Make sure to keep both 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.
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
10.4. Leak test and vacuum drying
It is very important that all refrigerant piping work is done before the
units (outdoor or indoor) are powered on.
When the units are powered on, the expansion valves will initialize.
This means that they will close. Leak test and vacuum drying of field
piping and indoor units is impossible when this happens.
Therefore, there will be explained 2 methods for initial installation,
leak test and vacuum drying.
NOTICE
Pay attention that mentioned torque range is applicable for
opening Ø19.1 and Ø25.4 gas line stop valves only.
Closing direction
Liquid side Gas side
1 Service port and service
port cover
2 Stop valve
3 Field piping connection
4 Stop valve cover
3
4
1
2
1 Service port
2 Cap
3 Hexagon hole
4 Shaft
5 Seal
1 2
345
1
2
3
4
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
Ø15.9 13.5~16.5 6 mm 23.0~27.0
Ø19.1
27.0~33.0 8 mm 22.5~27.5
Ø25.4
Refrigerant piping works are
finished?
No
Finish piping work
Yes
The indoor units and/or
outdoor unit were already
powered ON?
No
Use procedure
"10.4.2. Installation of
refrigerant piping, leak test,
vacuuming before electrical
installation is done (regular
installation method)" on
page 20.
Yes
Use procedure
"10.4.3. Installation of
refrigerant piping, leak test,
vacuuming after electrical
installation is done on any
indoor or outdoor unit" on
page 20.