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  TM 11-6780-225-12
Control
Function
Control
Function
Position
Operation
through
Level indicator
Indicates water level in wa-
valve D7.
ter tank.
Drain valve D10 ................
Open ............ Allows water
Outlet and inlet pressure
Used to determine differ-
to
flow
indicators.
ential pressure across wa-
from
ter filter.
the control
Position
Operation
unit to the
Petcock D12
Open
Allows water
floor drain.
to flow to
Closed .......... Prevents wa-
low-pres-
ter flow
sure side of
from the
level indi-
control unit.
cator.
Drain valve D11 ................
Open ............ Allows wa-
Closed
Prevents -
ter to flow
water flow to
from the
low-pres-
control
sure side
unit to the
of level in-
floor drain.
dicator.
Closed .......... Prevents wa-
Pressure regulator
Maintains pressure of 40 psi.
ter flow
Pressure relief valve
Allows water to flow into
from the
floor drain if pressure in
control
system exceeds 90 psi.
unit.
Pressure switch
Starts water pump when
Drain valve D13 ................
Open ............ Allows wa-
pres-
ter now
sure falls below 20 psi and
from high-
shuts off water pump at
pressure
40 psi.
side of
Pressure vacuum indicator
When vacuum in psi is indi-
level indi-
cated, valve S8 is closed
cator.
when operating water sys-
Closed .......... Prevents wa-
tem from water tank.
ter flow
Position
Operation
from high-
Prime valve P1
Open
Allows water
pressure
to flow
side of
from the
level indi-
processing
cator.
sink to
Flow control valve F1 ........
Allows 1/2 gp water replen-
prime the
ishment
from
water
water
system
pump. It,
to processing sink.
also allows
Flow control valve F3 ........
Allows 2 1/2 gpm tem-
the water
pered water to flow to
system to
the
be filled by
processing sink from con-
pumping
trol unit.
water from
Flow indicator....................
Indicates water flow in wa.
the proces-
ter system when white
sing sink
needle is rotating.
into the
Position
Operation
water sys-
High pressure petcock .......
Open ......... Allows evac-
tem and
vation of air
water tank.
from high-
Closed
Prevents
pressure side
wa-
of level
ter from
indicator.
entering
Closed ....... Prevents
water
evacuation
pump
of air from
through
high-pres-
valve P-I
sure side
and diverts
of level
water to
indicator.
drain
valve D-1.
2-13
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