iii
STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Warnings and cautions
WARNING
Disconnect electrical power
Disconnect electrical power before installing supply wiring or performing service or maintenance procedures on any
part of the humidifi cation system. Failure to disconnect electrical power could result in fi re, electrical shock, and other
hazardous conditions. These hazardous conditions could cause property damage, personal injury, or death.
Contact with energized circuits can cause property damage, severe personal injury, or death as a result of electrical shock
or fi re. Do not open control cabinet door or remove subpanel access panels until electrical power is disconnected.
Follow the shutdown procedure below before performing service or maintenance procedures on any part of the system.
Shutdown procedure
To prevent serious injury, follow this shutdown procedure before performing service or maintenance procedures on this
humidifi er, after the tank has cooled down and drained.
1.
Follow the “Cool down humidifi er” instructions on Page 50 (tap/softened water STS) or Page 53
(STS with RO/DI water option) to put the humidifi er at a safe temperature for service.
2.
Use the Vapor-logic
®
keypad/display to change control mode to Standby.
3.
Place all power disconnects in OFF position and lock in OFF position.
4.
Close the fi eld-installed manual water supply shut-off valve.
5.
Close the manual shut-off valve on the inlet steam supply.
CAUTION
Hot discharge water
Discharge water can be as hot as 212 °F (100 °C) and can damage the drain plumbing.
Humidifi ers equipped with a water tempering device need fresh make-up water in order to function properly. Make sure the water
supply to the water tempering device remains open during draining.
If the humidifi er is not equipped with a water tempering device, allow the tank to cool before opening the drain valve.
Excessive supply water pressure
Supply water pressure greater than 80 psi (550 kPa) can cause the humidifi er to overfl ow.
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