
P a g e 4 4 • D R I - S T E E M D e s i g n G u i d e
D R I - S T E E M D e s i g n G u i d e • P a g e 4 5
Figure 44-1:
Standard water systems
Figure 44-2:
DI/RO water systems
Evaporative system principle of operation
1. When the system is first activated, the fill valve opens and the
evaporating chamber fills with water to the operating level.
2. On a call for humidity, the heating elements are energized,
causing the water to boil. The fill valve opens and closes as
needed to maintain the operating water level.
3. During refill, a portion of the surface water is skimmed off,
carrying away precipitated minerals (standard water systems
only; DI/RO systems don’t require skimming).
4. Steam created in the evaporating chamber flows through vapor
hose or piping to the dispersion assembly, where it is discharged
into the airstream.
Conductivity
probe detects
water level
2
3
4
2
1
2
4
Manual
drain valve
Low-
water
cutoff
switch
Float
ball
1
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