Specifications

Page 34 • DRI-STEEM CRUV Electric Humidifier Installation, Operation, and Maintenance Manual
Tap/softened water
Maintenance
Before performing service or maintenance procedures and before
shutting off electrical power, cool down the humidifier according
to the instructions below for your controller type. 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.
Cool down humidifier (LW series controller)
1. Manually open the drain valve by moving the valve lever located
on the back of the drain valve to the manual open position. The
fill valve will open after enough water has drained out of the
tank.
2. Let the fill water run until the tank is cooled; then shut off the
field-installed manual supply water shut-off valve.
3. Let the tank drain; then manually close the drain valve.
Cool down humidifier (Vapor-logic4 controller)
• 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.
• Models with a standard drain valve:
– Manually open the drain valve by moving the valve lever
located on the back of the drain valve to the manual open
position. The fill valve eventually opens.
– Let the fill water run until the tank is cooled, then shut off
the field-installed manual supply water shut-off valve.
– Let the tank drain, then manually close the drain valve.
• Models with optional drain valves:
– For drain valves without the manual open lever, use the
keypad to perform the cool down process.
– Go to the control modes screen and select Manual Drain.
– Allow approximately half the water to drain out of the tank.
– In the Control Modes screen select Auto; the fill valve opens
and the humidifier cools down.
– When the fill valve closes, select Manual Drain in the
Control Modes screen and let the tank drain dry. The
humidifier should be cool enough to work on.
– For more information about using the keypad, see the
Vapor-logic4 Installation and Operation Manual.
WARNING
Hot surface and hot water hazard
Do not touch the tank or drain piping until
the unit has had sufficient time to cool, or
serious injury can occur.
Opening the drain valve when the
tank is hot can discharge water with a
temperature up to 212 °F (100 °C) into the
plumbing system. This can cause damage
to the plumbing system if the humidifier
is not properly connected to a water
tempering device such as a DRI-STEEM
Drane-kooler
™
.
mc_060110_1640
Shut down humidifier
Follow the procedure below before performing
service or maintenance procedures (after the
tank has cooled down and drained):
• If the humidifier is equipped with a Vapor-
logic4 controller, use the keypad to change
the control mode to Standby.
• Shut off all electrical power to the humidifier
using the field-installed fused disconnect,
and lock all power disconnect switches in the
OFF position.
• Close the field-installed manual water supply
shut-off valve.