Daikin VRV II Series, Design, Installation & Testing Instructions, Page: 182 / 242

Si39-303
176 Installation Manual
Opening shutoff valve
1. Remove the cap and turn the valve counterclockwise with the hexagon wrench (JISB4648).
2. Turn it until the shaft stops.
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.
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.
* For the tightening torque, refer to the table on the bellow.
Tightening torque
1.Service port
2.Cap
3.Hexagon hole
4.Shaft
5.Seal
Caution
!
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.
Flare shape and flare nut tightening torque
<Precautions when connecting pipes>
!
See the following table for flare part machining dimensions.
! φ
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.
!
φ
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.)
Shutoff
valve size
Tightening torque N-m (Turn clockwise to close)
Shaft (valve body) Cap (valve lid) Service port Flare nut
Gas line
piping
attached to
unit (1)
φ
6.4
5.4-6.6
Hexagonal
wrench
4 mm
13.5-16.5
11.5-13.9
14-17
_
φ
9.5 33-39
φ
12.7 8.1-9.9 18-22 50-60
φ
15.9 13.5-16.5
Hexagonal
wrench
6 mm
23-27 62-75
φ
22.2
27-33
Hexagonal
wrench
10 mm
36-44 _ 22-28
φ
25.4
1
2
3
4
5
Torque wrench
Spanner
Piping union
Flare nut