Herrmidifier Herrtronic AD, Руководство пользователя

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Herrtronic AD Series Installation, Operation and Service Manual
SECTION II UNIT OPERATION
Basic Operation
Controlled humidification requires a very precise control
system. The Herrtronic AD utilizes a solid state control to
monitor performance and maintain humidity. Further, the
Herrtronic AD evaluates the operation and alerts the
operator to problem conditions and prevents undesirable
operation.
1. Start-up: On initial start-up (prompted by the
humidistat), the fill valve opens allowing water to enter
the cylinder. When the water level rises to the
electrodes, current will flow and the water will begin
heating. As the water temperature rises, its conductivity
also increases, accelerating the rate of temperature
increase. When the output reaches the "capacity set
point”, the fill
valve closes. The output capacity may
continue to rise slightly beyond the "capacity set point".
As the water boils, the water level falls with resulting
output reduction.
2. Normal Operation: Upon achieving "capacity set
point”, the system begins operation in a steady state
mode. Output capacity slowly decreases until the
elapsed "cycle time" opens the fill
valve to replenish the
water level until the "capacity set point” output is
achieved. As the mineral concentration in the water
increases, the water conductivity also increases.
Accordingly, the rate of boiling increases. Eventually, the
rate of boiling reduces the output capacity below the
"low drain threshold" before the "cycle time" initiates the
fill
cycle. At this point, the drain valve opens discarding
the mineral laden (highly conductive) water, replacing
with fresh water, that lowers the mineral concentration
until the system is restored to the steady state mode.
This steady state operating mode continues with small
increases in the water level to maintain output capacity
(exposing new electrode surface).
3. End-of-Cylinder Life: Steady state operation
continues with "fill and boil" and periodic drain cycles
with ever increasing water levels. Eventually, the water
level reaches the cylinder full electrode, representing the
maximum allowable water level. The system output
begins to decrease since there is no new electrode
surface to expose. If the system operates 45 minutes
continuously without achieving "capacity set point”, the
fault light will illuminate indicating an "end of cylinder life
fault." Cylinder replacement should occur to maintain
satisfactory humidity levels.