23
HUMIDI-TECH
®
MAINTENANCE
DI water models (HUMIDI-TECH
®
DI)
The HUMIDI-TECH DI unit uses 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
To inspect and service
1.
Remove the evaporating chamber.
• Remove the two fasteners on each side of
the cover enclosure.
• Remove the enclosure.
•
Do not remove the electrical panel cover
or heater terminal cover until electrical
power is disconnected. Safety first.
• If the HUMIDI-TECH has a space
distribution unit (SDU) mounted directly
above it, the SDU cover must be removed
before removing the humidifier cover.
• If the tank is hot, cool it down by opening
the manual ball valve on the side of the
tank. The float valve will open allowing cool
water to run into the tank until it is cool
enough to handle.
• Shut off the water supply.
• Shut off the electrical supply.
• Allow the tank to drain completely.
• Disconnect the fill line at the fill fitting.
• Disconnect the electrical plugs between the
tank components and the back of the
electrical panel (includes: power plug, low
water switch plug, tank temperature sensor
plug and thermal trip plug).
DISCONNECT BY PULLING ON PLUG
HOUSING. DO NOT DISCONNECT BY
PULLING ON CORD OR WIRES.
• Disconnect the drain union on the back left
corner of the frame.
• Disconnect the steam supply hose from the
top of the tank.
• Lift the tank foot above the frame flange and
slide the tank assembly forward to remove.
2.
Loosen the four cover bolts and remove the
cover assembly from the tank.
3.
Inspect the tank interior for debris or pitting.
4.
Inspect the valve inlet for debris.
5.
Check the operation of the float valve and the
condition of the float seat.
6.
Check the low water switch to make sure the
float slides freely on the stem.
7.
Secure the chamber cover making sure the
cover gasket is seated and the chamber is
sealed.
8.
Reinstall the evaporating chamber.
• Reconnect the fill line.
• Reconnect electrical plugs
(plugs are color coded).
• Reconnect drain union.
• Reconnect vapor hose.
9.
Verify electrical connections.
• Verify that all DIN rail-mounted components
are securely fastened to DIN rail.
• Verify that all power terminal screws and lugs
are tight from power block to heaters. See the
table on Page 22 for torque specifications.
• Verify that all plugs located under the
humidifier cover are completely plugged in.
10. Close the drain valve.
11. Turn on the water supply.
11. Turn on the electrical power.
Off-season shut-down procedure
1.
Switch off electric power.
2.
Remove enclosure.
3.
Shut off water supply to makeup valve.
4.
Drain evaporating chamber by opening the drain
valve. For units with end-of-season drain, refer
to the VAPOR-LOGIC
®
3
manual.
5.
Replace enclosure.
6.
Leave chamber dry, power off, and water shut-
off valve closed until the next humidification
season.
VM99-C-0302-M-0302.pdf 23
11/19/2009 9:51:09 AM
