DRI-STEEM XT Series Electrode Steam Humidifier Installation, Operation, and Maintenance Manual • Page 63
Table 63-1:
Problem/possible cause/action
Problem Possible cause Action
Unit does not fill with
water.
No water supply to fill valve • Verify that manual water supply valve is open and that pressure exists.
• Check if water supply line strainer is plugged. Clean strainer or replace.
• Verify fill valve electrical connections.
• Clean or replace fill valve strainer if plugged.
Unit control is not on • Press On/Off switch on display panel.
• Verify transformer electrical connections.
Malfunctioning fill valve • Cycle fill valve while in Service mode. If fill valve does not open:
– Verify fill valve electrical connections.
– Verify proper 24 VAC (terminals 2 and 5) to fill valve. If voltage is present and valve does
not open, replace valve.
Humidifier is in end-of-
season drain mode.
• Check for humidification demand signal at control board. See control wiring diagrams for terminal
check points.
Fill valve does not close. Malfunctioning level control
system
• Check that high water sensor electrical plug is fully engaged.
• Check water conductivity. Water conductivity must be at least 125 μS/cm
. Add sodium bicarbonate
through steam outlet on top of steam cylinder to increase. Start with ¼ tablet. Consult DRI-STEEM for
further advice.
Fill valve is stuck. • Check for control voltage across fill valve coil (terminals 2 and 5 on control terminal strip).
• Check if there is an obstruction that does not allow valve to seat properly. Clean or replace valve as
needed.
Drain valve is open. • Clean or replace drain valve if an obstruction in the valve does not allow complete closure.
• Replace broken or weak return spring on drain valve.
Fill valve cycles on and
off frequently (several
times per minute)
Malfunctioning level control
system
• Check water conductivity. Water conductivity must be at least 125 μS/cm
. Add sodium bicarbonate
through steam outlet on top of the steam cylinder to increase. Start with ¼ tablet.
Consult DRI-STEEM for further advice.
Drain valve not fully closed • If an obstruction does not allow drain valve to fully close, clean valve.
• Replace broken or weak return spring on drain valve.
Unit does not perform
autodrain sequence
No power to automatic drain
valve
• Verify drain valve electrical connections.
• Check if 24 VAC is present at the internal controller board terminals 3 and 6 for drain valve.
Drain fault, plugged drain
valve, or plugged drain pipe
• Check drain valve piping.
Defective automatic drain
valve
• If voltage is present at valve and it still does not open, replace valve.
Unit does not perform
end-of-season drain
Input signal always has a
demand
• Reduce demand signal.
Drain valve • Verify drain valve electrical connections.
• Verify drain valve is wired correctly to control board.
• Check 24 VAC across valve coil during test cycle (terminals 3 and 6 on control terminal strip).
More on the next page
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Troubleshooting (continued)
XT_IOM_Jan_2008.pdf 65 11/19/2009 10:13:40 AM
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