35
I N S TA L L AT I O N A N D O P ER AT I N G I N S T R U C T I O N S
1. Remove the front mimic, Unscrew the pressure indicator
by unscrewing the
C
hexagon nut as shown on the figure
at the right.
2. Screw the adapter to the valve. The tightening torque is
max 45 Nm.
3. Before connecting the hose from the gas bottle to the
adapter, the air in the hose must be removed by running
SF
6
gas through the hose. The SF
6
gas must be
recovered.
4. When gas is flowing into the RMU/switchgear, the
manometer on the gas bottle has to be observed.
5. When it shows 1,3 bar absolute at ambient temperature
20°C, the gas filling must be stopped.
6. Remove the filling hose and connect the pressure device
to check the pressure inside the RMU/switchgear. When
the correct pressure of 1,3 bar absolute is obtained,
remove the adapter, check that the sealing between the
pressure indicator and the valve is smooth and clean, and
screw the pressure indicator to the RMU/ switchgear
with tightening torque max 45 Nm as shown below.
—
Figure 13.4
Unscrewing of Manometer
NOTE!
Screw/unscrew on thiS
C
hexagonal nut only. The pressure indicator
can be dismounted from the switchgear without SF
6
leakage from the
SF
6
tank.
13.2 Altitude
Height above sea level for installation without reducing gas
pressure is 1000 meters. For installation above 1000 meters,
please contact ABB for instructions.
13.2.1 Adjustment of gas pressure in higher altitudes
Remove the front cover in order to get access to the top of
the manometer. On top of the manometer, a screw is
situated
D
.
Open this screw carefully until the arrow starts
moving. When the movement stops, tighten the screw again.
Now the pressure is equalized and unless there is a leak
(which is very unlikely) the arrow will be positioned at the
correct level.
D
—
Figure 13.5
Manometer pressure adjustment screw
