Operating instructions

47
Operation:
Float valve
Water level control: float valve.
Operation
Float valve system
DI/RO water systems (except for ULTRA-FOG
®
) use
a float valve system to control water levels for
optimum operating efficiency. DI/RO systems are
used where water/steam purity is important, where
demineralized water is needed to improve
performance or lessen maintenance requirements, or
where a potable water source has minimal or no
conductivity, thus requiring a float rather than a
probe to sense water levels.
The float valve system consists of a fill float and a
low-water cutoff float.
The fill float regulates how much water is added
to the tank via a float, float arm and mechanical
valve. The valve is adjusted to within 1/4" of the
overflow (skimmer) port allowing heated and
therefore expanded water at start-up to fill the
external P-trap.
The low-water cutoff float has an electrical switch
that closes when a ready-water condition is
reached. A low voltage AC current runs from the
VAPOR-LOGIC
®
3
controller to the switch allowing
the controller to sense when the voltage drops as the
switch closes to ground at a ready-water condition.
Figure 47-1: Float valve system
used with DI/RO systems
OM-3009
Stripe mark indicates proper float ball placement on
stem. Switch is normally open when float ball is at its
lowest point on stem.
Stem