53
STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
RO/DI water option
MAINTENANCE
Regularly verify that water processing equipment is operating correctly. The
presence of chlorides in improperly processed RO/DI water eventually causes
pitting and failure of the heat exchanger, tank, and components. Your DriSteem
warranty does not cover damage caused by chloride corrosion.
STS humidifi ers with the RO/DI water option do not require cleaning, but
regular inspections are advised. There are no skimming, drain, or fl ush cycles.
COOL DOWN HUMIDIFIER
Before performing any maintenance, allow the tank to cool down.
Note: Fresh make-up water is used to speed up cooling. Do not close the
manual water supply before cooling down the humidifi er; otherwise the
tank could stay hot for several hours.
• Insulated and uninsulated tanks will have hot surfaces.
•
Close the manual shut-off valve on the inlet steam supply.
• Models with a standard drain valve:
– Manually open the drain valve.
The
fl oat valve opens.
–
Let the fi ll water run until the tank is cooled; then shut off the fi eld-
installed manual supply water shut-off valve.
–
Let the tank drain; then manually close the drain valve.
•
Models with end-of-season drain option:
–
Use the keypad to perform the cool down process. Refer to the
Vapor-logic Installation and Operation Manual
.
– Select Manual Drain in the control modes screen.
–
Allow approximately half the water to drain out of the tank.
–
Select Auto in the control modes screen; the fi ll valve opens and the
humidifi er cools down.
–
When the fi ll valve closes, select Manual Drain in the control modes
screen and allow the tank to drain completely dry. The humidifi er should
be cool enough to work on.
WARNING
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. Use Vapor-logic keypad/display to
change control mode to Standby.
2. Place all power disconnects in OFF
position and lock in OFF position.
3. Close the fi eld-installed manual
water supply shut-off valve.
4. Close the manual shut-off valve on
the inlet steam supply.
