Installation guide
DRI-STEEM Vapor-logic
3
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Dew point control
Dew point control functions in exactly the same way as RH control
except the dew point is being measured instead of the RH. The dew
point transmitter sends a signal to the Vapor-logic
3
controller. Users
can modify the dew point set point and PID parameters through the
keypad/display just as they can with an RH transmitter.
Tank preheat feature
The tank preheat feature heats the water in the tank to near boiling
to allow a rapid response to a demand signal. Its operation is as
follows: If the tank is cold when a small demand signal is present,
the Vapor-logic
3
controller overrides the demand signal and runs
the humidifier at 100% demand until the tank temperature reaches
190 °F (88 °C).
At this point, control is returned to the original demand signal and
the humidifier begins normal operation. This allows the system to
respond quickly to even the smallest demand. When preheating, the
“Preheating Tank” message appears on the Idle screen. This feature
is standard on all DRI-STEEM humidifiers with Vapor-logic
3
control except Steam Injection humidifiers.
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operation
VL3_IOM.pdf 75 11/19/2009 9:11:16 AM