Schmidt AS 990 - Drain water system

Translation of Original Operating Instructions
Airport Sweeper / Airport Stand Cleaner
2017-02-02 142
20.9.2 Drain water system

Loosen the hose clamp (1)
 Remove hose
 After draining properly, attach the hose again.
Or:
 Remove the cover (2).
 Release the check valve, e.g. with a screwdriver.

Unscrew and drain water filter (1).
 Open ball valve (2) and drain tank.
 The ball valve (2a) must be closed. The tank
can be irreparably damaged if air is blown into it.
 Switch on the ignition for the auxiliary engine
and the control panel.
 Open pneumatic valve (3). Air is blown through
the water system.
 Activate drain mode
 Water valves are automatically connected
one after the other.
This drains the following:
o Spray bar
o Disc brush spray facility
o Suction assembly spray facility
 Set ball valve (6) to hopper spray bar.
This drains the following:
o Hopper spray bar
 Close D coupling with cover. Set ball valve
to spraying hose (7) and open the spray hose
nozzle.
This drains the following:
o Spraying hose
 High-pressure cleaning system by actuating
the spray wand valve (5).
This drains the following:
o High-pressure cleaning system
 Close pneumatic valve (3).
 Open the ball valve (2) and install the water
filter again.
 Set ball valve (7) to the spray hose position.
1
2
1
2
3
6
7
5