Page 58 • DRI-STEEM XT Series Electrode Steam Humidifier Installation, Operation, and Maintenance Manual
Maintenance procedures
Inspect unit every 500 hours of operation
At 500 hour intervals, inspect the steam cylinder, fill and drain
valves, vapor hose, condensate piping, water supply piping, drain,
drain piping, and all other parts for proper operation and/or
cleaning requirements. Verify proper operation of high limit
humidistat, relays, and airflow proving switch.
Clean and/or replace the steam cylinder
Steam cylinder service life depends on operating hours and water
hardness. Replace the steam cylinder when the electrodes become
insulated with mineral deposits to a degree that output demand can
no longer be achieved (when the maximum water level sensor is
repeatedly triggered).
To clean and/or replace the steam cylinder:
1. Close the field installed manual supply water shut-off valve.
2. Drain water from the steam cylinder.
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.
3. When the steam cylinder is completely empty, turn the
humidifier off. Place all power disconnects in the OFF position
and lock in the OFF position.
4. Open the steam cylinder door.
CAUTION! Cylinder and any undrained water may be hot. To
avoid injury from hot water, make sure cylinder and humidifier
components have cooled before proceeding with maintenance.
5. Disconnect the steam hose.
After the cylinder and humidifier components have cooled,
loosen the steam hose clamp and disconnect the steam hose
from the cylinder.
6. Disconnect the electrode plugs and high water sensor wire.
7. Remove the cylinder.
8. Check the drain valve.
If the drain valve port is dirty, clean per the instructions on
Page 59.
9. Check O-ring.
Ensure that the O-ring of the drain valve body is correctly
placed. Change the O-ring if necessary. Dampen the O-
ring seals with water before replacing cylinder. Do not use
lubricant or other substance.
WARNING!
When performing maintenance on the XT
Series humidifier:
• Close the field installed manual supply
water shut-off valve.
• Turn the humidifier off.
• Place all power disconnects in OFF position
and lock in OFF position.
Failure to follow these instruction can result
in property damage, severe personal injury,
or death as a result of electric shock, burns,
and/or fire.
Note:
It is advisable to keep a spare steam
cylinder in stock during humidification
season. See the replacement parts section of
this manual for part numbers.
XT_IOM_Jan_2008.pdf 60 11/19/2009 10:13:40 AM
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