60
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
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 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 .
See “Chloride corrosion” Caution at right .
Water level control
OPERATION
Supply water connection
Float rod
Float ball
OM-7396
Humidifiers using DI/RO water control water levels using a float valve
and low-water cutoff switch .
mc_052710_1644
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
XT humidifiers do not use the float valve system
for water level control . See “Electrode steam
CAUTION
Chloride corrosion
Damage caused by chloride corrosion
is not covered by your DriSteem
warranty .
Chloride corrosion can result from a
variety of causes, including, but not
limited to
• Improper water deionization
processes
• Improper water softening processes
• Humidifier’s supply water
FIGURE 60-1:
WATER LEVEL CONTROL FOR DI/RO WATER SYSTEM
FIGURE 60-2:
LOW WATER CUTOFF SWITCH FOR DI/RO WATER SYSTEMS
