DRI-STEEM XT Series Electrode Steam Humidifier Installation, Operation, and Maintenance Manual • Page 45
Operation (continued)
steam. As the amount of water covering the electrodes increases,
or as water conductivity increases, current flow increases. The fill
valve remains open until the current flow increases to the amperage
corresponding to the demand signal. When this amperage is met,
the fill valve closes and water continues to boil off into steam. As
the water level decreases, current flow decreases. When current
flow becomes less than the amperage corresponding to the demand
signal, the fill valve opens to increase the water level in the cylinder
to increase current flow, increasing steam production. Steam created
in the cylinder flows through the steam outlet via vapor hose or
piping to the dispersion assembly, where it is discharged into the
airstream.
The humidifier has integral drain water tempering. Water
automatically cools to 140 °F (60 °C) or cooler when draining.
End-of-season drain
If there is no call for humidity for 72 hours, the humidifier is placed
in End-of-Season (EOS) mode. When the unit enters EOS mode,
the drain valve remains open for five minutes to allow the steam
cylinder to drain, and then closes. When the humidifier receives a
call for humidity after the end-of-season drain, the steam cylinder
refills and the humidifier resumes normal operation. Draining the
steam cylinder after 72 hours reduces the possibility of electrode
corrosion and microbial growth in the cylinder.
Extended shutdown
To prepare the unit for an extended shutdown:
1. Drain the steam cylinder to reduce possibility of electrode
corrosion. Open the drain valve by pressing the MODE button to
illuminate the Service LED. Press the SELECT button repeatedly
until dr.of appears on the display. Press the SET button to
display dr.on and the drain valve opens. Check to make sure the
steam cylinder is drained.
2. Turn the unit off by toggling the on-off switch.
3. Open the main external fused disconnect to stop power to the
humidifier.
4. Close the water supply shut-off valve to the humidifier.
5. After shutdown, limit unit access to qualified service personnel
only.
Safety functions
XT Series humidifiers are protected against running dry — current
does not flow when the electrodes in the steam cylinder are no
longer submerged in water. After 30 minutes of no current, an E3
message is displayed (see Page 56).
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XT_IOM_Jan_2008.pdf 47 11/19/2009 10:13:40 AM
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