Daikin VRV II Series Design, Installation & Testing Instructions page 182

Opening shutoff valve
1. Remove the cap and turn the valve counterclockwise with the hexagon wrench (JISB4648).
2. Turn it until the shaft stops.
3. Make sure to tighten the cap securely.
Closing shutoff valve
1. Remove the cap and turn the valve clockwise with the hexagon wrench (JISB4648).
2. Securely tighten the valve until the shaft contacts the main body seal.
3. Make sure to tighten the cap securely.
Tightening torque
valve size
!
Caution
!
!
!
Flare shape and flare nut tightening torque
<Precautions when connecting pipes>
!
! φ
! φ
!
!
176
Do not apply excessive force to the shutoff valve. Doing so may break the valve body, as the
valve is not a backseat type. Always use the special tool.
* For the tightening torque, refer to the table on the bellow.
Shutoff
Shaft (valve body)
φ6.4
5.4-6.6
φ9.5
φ12.7
8.1-9.9
φ15.9
13.5-16.5
φ22.2
27-33
φ25.4
5
Always use a charge hose for service port connection.
After tightening the cap, check that no refrigerant leaks are present.
When loosening a flare nut, always use two wrenches in combination. When connecting the
piping, always use a spanner and torque wrench in combination to tighten the flare nut.
When connecting a flare nut, coat the flare (inner and outer faces)
with etheral oil or ester oil and hand-tighten the nut 3 to 4 turns as
the initial tightening.
See the following table for flare part machining dimensions.
12.7 or greater
When loosening a flare nut, always use two wrenches in combination. When connecting the
piping, always use a spanner and torque wrench in combination to tighten the flare nut.
6.4 or φ 9.7
Tighten with one torque wrench within the set torque.
(Do not use two wrenches because this might cause the refrigerant to leak.)
(Use ester oil or ether oil.)
See the following table for tightening torque.
(Applying too much torque may cause the flares to crack.)
Tightening torque N-m (Turn clockwise to close)
Cap (valve lid) Service port
Hexagonal
13.5-16.5
wrench
4 mm
18-22
Hexagonal
wrench 23-27
6 mm
Hexagonal
wrench 36-44
10 mm
1
2
1.Service port
2.Cap
3.Hexagon hole
4.Shaft
5.Seal
3
4
Flare nut
attached to
14-17
33-39
50-60
11.5-13.9
62-75
_
Torque wrench
Spanner
Piping union
Flare nut
Installation Manual
Si39-303
Gas line
piping
unit (1)
_
22-28