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Operation
If the window temperature falls below the dew point, Vapor-logic4
automatically decreases the RH set point so moisture does not
form on windows. The Home screen displays the modified RH
set point, and an asterisk (*) appears next to the modified RH set
point, denoting that temperature compensation has taken control
of the RH set point. The “Temp comp on” message appears in the
Messages Log and the Message softkey label becomes highlighted.
When the interior window glass temperature rises above the
dew point, Vapor-logic4 restores system control to the normal
RH set point for the space, and the “Temp comp on” message
automatically clears.
The temperature compensation control option is available only
when the system is equipped with an RH transmitter. It is not
available when a remote humidistat, dew point transmitter, or
building automation system is used to control the humidifier.
The transmitter provided with Vapor-logic4 is calibrated for
–20 °F to 160 °F (–29 °C to 71 °C) with output from 4 to 20 mA.
For example, a temperature reading of 70 °F (21 °C) should produce
a measurement of 12 mA. You can calibrate the sensor by adjusting
the offset in the auxiliary temp sensor section of the Setup menu.
Auxiliary temperature sensor option
Note: This option is not applicable for XT humidifiers.
When selected as an option, DRI-STEEM provides a temperature
sensor for monitoring temperature in a duct or space. Temperature
from this sensor can be viewed from the Status menu (“Aux
temperature”). Temperature history data is logged to the data log
and can be downloaded from the download data section of the
Diagnostics menu.
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. If the tank is cold
when a small demand signal is present, the Vapor-logic4 controller
overrides the demand signal and heats until the tank temperature
increases to the boiling point. At this point, control is returned to
the original demand signal.
Preheating allows the system to respond quickly to small demand
requests. When preheating, the word “Heating” appears on the
Home screen.
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