Daikin VRV III RXYQ5-54PY1, Service Manual

Page: 160 / 398

Si34-601A Test Operation
Test Operation 149
[Shutoff Valve Operation Procedure]
When operating the shutoff valve, follow the procedure instructed below.
Note:
„
Do not open the shutoff valve until “1.2.1 Check work prior to turn power supply on” in page
145 are completed. If the shutoff valve is left open without turning on the power, it may cause
refrigerant to buildup in the compressor, leading insulation degradation.
„
Be sure to use the correct tools.
„
The shutoff valve is not a back-seat type. If forced it to open, it might break the valve body.
„
When using a service port, use the charge hose.
„
After tightening the cap, make sure no refrigerant gas is leaking.
[Tightening torque]
The sizes of the shutoff valves on each model and the tightening torque for each size are listed
in the table below.
<Size of Shutoff Valve>
<Tightening torque>
[To open]
1. Remove the cap and turn the shaft counterclockwise with the hexagon wrench (JISB4648).
2. Turn it until the shaft stops.
3. Make sure to tighten the cap securely.
(For the tightening torque, refer to the item <Tightening Torque>.)
[To close]
1. Remove the cap and turn the shaft 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 item <Tightening Torque>.)
5HP type 8HP type 10HP type 12HP type 14HP type 16HP type 18HP type
Liquid side
shutoff valve
φ
9.5
The 12HP type corresponds to the 12.7-diameter
onsite piping using the included piping.
φ
12.7
The 18HP type corresponds to the
15.9-diameter onsite piping using the
accessory pipe.
Gas side
shutoff valve
φ
15.9
φ
19.1
φ
25.4
The 10HP type corresponds to the
22.2-diameter onsite piping using the accessory pipe.
The 12 ~ 18HP type corresponds to the 28.6-diameter onsite
piping using the accessory pipe.
Shutoff valve size
Tightening torque N·m (Turn clockwise to close)
Shaft (valve body)
Cap
(valve lid)
Service port
φ
9.5 5.4 - 6.6
Hexagonal wrench
4 mm
13.5 - 16.5
11.5 - 13.9
φ
12.7 8.1 - 9.9 18.0 - 22.0
φ
15.9 13.5 - 16.5
Hexagonal wrench
6 mm
22.5 - 27.5
φ
19.1
27.0 - 33.0
Hexagonal wrench
8 mm
φ
25.4
fig 34
Cap
Hex holes
Shaft (valve body)
Seal section
Service port