Page 54 • DRI-STEEM XT Series Electrode Steam Humidifier Installation, Operation, and Maintenance Manual
Sequenced application
Up to four XT Series humidifiers can be connected to operate in
sequence. In a sequenced application, one control input signal is
divided in a pre-determined range of settings, depending on how
many humidifiers are connected in sequence. These settings, shown
in Table 54-1, are entered while in Program mode by changing
the variable SPLt (see Table 52-1). See also the wiring diagrams on
pages 17-19 for wiring sequenced humidifiers.
Table 54-1:
Settings for sequencing multiple humidifiers
Number of
humidifiers
connected in
sequence
Setting for
humidifier No. 1
Setting for
humidifier No. 2
Setting for
humidifier No. 3
Setting for
humidifier No. 4
1 00. 99 — — —
2 00. 49 50. 99 — —
3 00. 49 50.74 75. 99
4 00. 24 25. 49 50. 74 75. 99
Sequence application example
Two units are operated with one 0-10 VDC controller signal.
The first unit is set to 00. 49. The second unit is set to 50. 99.
With these settings, the first unit operates between 0 and 100% of
maximum capacity with a controller output of 0-5 V, and the second
unit operates between 0 and 100% of maximum capacity with a
controller output of 5-10 V.
Humidifier start-up
After connecting the steam hose, water supply, drain piping, and
power per the instructions in this manual, open the water supply
and turn on the humidifier's on-off control switch.
When there is a call for humidification with the airflow proving
switch and high limit humidistat contacts closed, the contactor
closes, the inlet valve opens, and water flows into the steam
cylinder. When the water reaches the electrodes, electric current
flows, heats up the water, and steam is produced after a short time.
The nominal steam capacity will be reached after a start-up time
dependent on the supply water conductivity.
It is possible that the maximum fill level or SE.on (see Table 48-1)
is reached during start up or after the installation of a replacement
cylinder. When SE.on is reached, the inlet valve closes momentarily.
This is quite normal during this water conductivity verification
Sequenced application; humidifier
start-up
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XT_IOM_Jan_2008.pdf 56 11/19/2009 10:13:40 AM
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