WA R N I N G
Indicates a hazardous situation that could result in death or
serious injury if instructions are not followed.
C A U T I O N
Indicates a hazardous situation that could result in damage to
or destruction of property if instructions are not followed.
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STS
®
Steam-to-Steam Humidifier,
DI Water
LTS
®
Liquid-to-Steam Humidifier,
DI Water
Service Kit Manual
Parts in this service kit are for STS03 and/or LTS03 humidifiers (February 2003 to present). Parts are listed on page 2.
WA R N I N G
Read all warnings and instructions
This page provides important safety instructions; it is intended to supplement — not replace — the humidifier's Installation, Operation, and
Maintenance Manual (IOM). Read the IOM that was provided with the humidifier before performing service or maintenance procedures
on any part of the system. Failure to follow all warnings and instructions could produce the hazardous situations described here and in the
IOM, resulting in property damage, personal injury, or death.
If the IOM is missing,
go to www.dristeem.com to download a replacement.
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Hot surfaces and hot water
Steam humidification systems have extremely hot surfaces, and water in tanks, electrode cylinders, steam pipes, and dispersion assemblies
can be as hot as 212 °F (100 °C). To avoid severe burns, allow the entire humidification system to cool.
Follow the cool-down procedure in the humidifier's IOM before performing service or maintenance procedures on any part of the system.
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Electrical shock hazard
If the humidifier starts up at a call for humidity during maintenance, severe bodily injury or death from electrical shock could occur. To
prevent such start-up, follow the procedure below before performing service or maintenance procedures on this humidifier (after the tank
has cooled down and drained):
1. Use the Vapor-logic
®
3 controller keypad to change the control mode to Standby.
2. Shut off all electrical power to the humidifier using the field-installed fused disconnect, and lock all power disconnect switches in the
OFF position.
3. Close the field-installed manual water supply shut-off valve.
4. Close the manual inlet steam supply (on STS) or inlet hot liquid supply (on LTS) shut-off valve.
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C A U T I O N
Damage from hot discharge water
Discharge water can be as hot as 212 °F (100 °C) and can damage the drain plumbing.
If the humidifier is equipped with a water tempering device such as a DRI-STEEM Drane-kooler
™
, it needs fresh make-up water in order to function
properly. Make sure the water supply to the Drane-kooler remains open during draining.
If the humidifier is not equipped with a water tempering device, allow the tank to cool before opening the drain valve.
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