TM 5-4610-218-12
(4) If the filtered water flow drops noticeably
rim of the inner tank. Adjust the drain valve DV-21
indicating that it is no longer practical to continue
so that the amount of slurry draining to waste al-
the filter run, stop the operation and backwash the
lows an even overflow of clear water into the inner
filter. Refer to paragraph 2-9 to put the filter back
tank.
into operation.
NOTE
When treating heavy turbid water, the
sludge concentrator tank must be
NOTE
drained rapidly. Increase the opening
Coagulated water may be obtained for
of drain value DV-21. To prevent com-
precasting, preparing chemical solu-
pacting of heavy slurries in the inner
tions, or any general purpose from the
tank, close control valve CV-16.
angle control valve CV-15 (fig. 2-1).
(2) Maintain the slurry blanket in the er-
dlator tank at a level that will keep the slurry draw-
off port just visible in the side of the erdlator tank.
To increase or decrease the flow of slurry to the wet
well tank, adjust control valve CV-17 or drain valve
2-14. Blackout Toggle Switch.
DV-21.
a. Location. The blackout toggle switch (fig. 2-
NOTE
20) is mounted in the van roof panel.
The control valve CV-14 in the line
b. Purpose. Switch is for a 110-volt system and
from the slurry weir box to the sludge
used for the van lights when the unit is stationary
concentrator tank should always be
and using power from a 110-volt system.
open. Do not use this valve to control
slurry flow.
g. Wet Well Warning Buzzer and Light. The
operation of the warning buzzer and light, located
at the electrical control cabinet, indicates that the
2.15. Van Door Black Out Switch.
water level in the wet well is low. If low water level
a. Location. The van body door black-out
persists, decrease filter flow through the controller
valve CV-45 to 22 gpm. If low water level still per-
switches (fig. 2-21) are located, one above the right
side door and the other above the rear door.
sists, turn the control valve CV-46 to R (recirculate)
to maintain the coating on the filter until the trou-
b. Purpose. When the ceiling light toggle
ble can be determined.
switch (fig. 2-20) is in the black-out position, the
door switch will turn the ceiling lights off when the
h. Filter Operation Check. Should any of the
doors are opened
following conditions occur, backwash the filter ele-
VAN BODY CEILING
TS 4610-218-12/2-20
Figure 2-20. Ceiling light toggle switch
ments, fig. 2-18.
2-16. Personnel Heater Controls.
(1) Large area of filter elements are not cov-
a. Fuel Shut off Valve.
ered by diatomaceous earth.
(2) The suspended material is visible in the
(1) Location. The heater fuel shut off valve
filtered water or the water appears cloudy.
below the heater instruction plate.
(3) The filter pump effluent pressure gage
(2) Purpose. It controls the fuel flow to the
reads less than 4 psi.
2-50
Change 3
