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Operation
Float valve system
DI/RO water systems (except for steam injection) 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 ball, float arm, and mechanical valve. The valve is adjusted to
fill the evaporating chamber within ¼" (6 mm) of the overflow port
allowing heated, and therefore expanded, water at startup to fill the
external P-trap.
The low water cutoff float has an electrical switch that closes when
a ready water condition is reached. This float switch provides low
water protection for the heating outputs. If the water falls below the
float, the heating outputs are disabled.
CAUTION!
Damage caused by chloride corrosion is not covered by
your DRI-STEEM warranty. Chloride corrosion can result from
improperly functioning deionizing (DI) beds.
Figure 52-1:
Water level control for DI/RO
water systems
Fill valve
Float rod
Float ball
VLC-OM-026
Figure 52-2:
Low water cutoff switch for DI/RO
water systems
A zero mark on top of the float indicates
proper float placement on stem. Switch
is normally open when float ball is at its
lowest point on the stem.
OM-3009
W a t e r l e v e l c o n t r o l
