DriSteem Vaporstream Mode D'emploi page 4

Va p o r s t r e a m , D I W a t e r, s e r v i c e i n s t r u c t i o n s
Cool down humidifier
Before performing service or maintenance procedures, allow
the tank to cool down. Insulated and uninsulated tanks will
have hot surfaces.
Note: Fresh make‑up water is used to speed up cooling. Do
not close the manual water supply before cooling down
the humidifier; otherwise the tank could stay hot for
several hours.
1. Verify that there is no call for humidity and that the
aquastat set point (adjusted using the keypad/display Setup
screens) is less than room temperature (default setting
is 40 °F [4 °C]) so that the heaters do not energize while
cooling down the tank.
2. Verify that the tank is in Auto mode so it will fill after
draining begins.
3. Drain the tank:
Models with a standard drain valve:
a. Manually open the drain valve. The fill valve will open
after enough water has drained out of the tank.
b. Let the fill water run until the tank is cooled; then shut
off the field‑installed manual supply water shut‑off
valve.
c. Let the tank drain; then manually close the drain valve.
For models with end-of-season drain option, use the
keypad to perform the cool down procedure:
a. Select Manual Drain in the control modes screen.
b. Allow approximately half the water to drain out of the
tank.
c. Select Auto in the control modes screen; the fill valve
opens and the humidifier cools down.
d. When the fill valve closes, select Manual Drain in
the control modes screen and allow the tank to drain
completely dry. The humidifier should be cool enough
to work on.
For more information about using the keypad, see the
Vapor-logic3 Installation and Operation Manual.
Shut down humidifier
Follow the procedure below before performing service or
maintenance procedures (after the tank has cooled down and
drained):
1. Use the Vapor‑logic3 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.
Page 4 • DRI-STEEM Vaporstream Electric Humidifier, DI Water, Service Kit Manual
Inspection and maintenance
Annually (also recommended when maintenance is performed)
1. All safety devices in the control circuit should be cycled on
and off to verify they are functioning. These include:
• High limit switch
• Airflow proving switch
• Low water cutoff switch
2. Measure current draw of heaters and verify amp values per
stage by comparing to the wiring diagram located inside
the control cabinet. This identifies any burned out heaters.
Only qualified electrical personnel should perform this
task.
3. Inspect tank and gaskets for leaks.
4. Verify that the float valve is closing off. If the float valve
will not shut off, there may be particulate on the valve seat,
or the stopper may be worn and need replacing.
5. As long as mineral‑free water is used in the Vaporstream
VLDI, no cleaning or flushing of the humidifier should be
necessary.
Off-season maintenance
Perform a complete inspection of the following:
• Heaters
• Float valve
• Low water cutoff switch
• Humidifier tank and gaskets
After inspection, leave the humidifier empty until
humidification is required.
Water quality recommendations
DI models use DI/RO water. Because these water types are
mineral‑free, cleaning the evaporating chamber should not
be necessary. However, there are some maintenance steps
that should be followed to ensure all parts of the unit are in
working order.
Important: Verify regularly that water processing equipment
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is operating correctly. The presence of chlorides in improperly
processed DI water will eventually cause pitting and failure
of the humidifier tank and its components. Damage caused
by chloride corrosion is not covered by your DRI‑STEEM
warranty.
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