MCAC-UTSM-2008-05 Refrigerant Piping Connection
Installation 89
z Be sure to use both a spanner and torque wrench together when connecting or disconnecting pipes to
/from the unit.
Caution:
z Too large torque will harm the bell mouthing and too small will cause leakage.
z After the connecting work is finished, be sure to check that there is no gas leak.
How to expel the air with a vacuum pump
Stop valve operation introduction
1. Opening stop valve
1) Remove the cap and turn the valve counter clock-wise with the hexagon wrench.
2) Turn it until the shaft stops. Do not apply excessive force to the stop 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.
2. Closing stop valve
1) Remove the cap and turn the valve clockwise with the hexagon wrench.
2) Securely tighten the valve until the shaft contacts the main body seal.
Make sure to tighten the cap securely.
For the tightening torque, refer to the table below.
Tightening torque N M (Turn clockwise to close)
Stop Valve size Shaft (valve body) Cap (Valve lid) Maintenance nut
Φ6.4
Φ9.5
5.4～6.6 13.5～16.5
Φ12.7 8.1～9.9
Hexagonal
wrench 4 mm
18～22
Φ15.9 13.5～16.5
Hexagonal
wrench 6mm
23～27
Φ22.2
Φ25.4
27～33
Hexagonal
wrench 10 mm
36～44
11.5～13.9
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