9
MAINTENANCE
CRU
®
V Humidifier
(Non-DI humidifiers with either the LW 415 or
VAPOR-LOGIC
®
3
Control Systems)
Mineral Precipitate
As evaporation takes place in the CRUV humidifier, some
of the minerals dissolved in the water precipitate out and
float on the water surface. The minerals not removed by
the skimmer (VAPOR-LOGIC
®
3
option only) will settle to
the bottom of the evaporating chamber.
Cleaning the Evaporating Chamber
The heating element itself is self-cleaning. The mineral
buildup on the element flakes off after reaching a thick-
ness of about 1/16" (2 mm), and settles to the bottom of
the chamber.
Long heater element life can be expected when the
operation of the humidifier is observed for a few weeks
following initial start-up. By observing the mineral build-up
rate, the frequency of both drain/flush use and manual
cleaning can be determined and adjustments made.
CAUTION: Before this mineral scale builds up on the
underside of the heating element, it must be removed.
Failure to do so may result in premature heater burn-
out.
The CRUV humidifier is designed for convenient cleaning
and maintenance.
To Inspect and Service:
1. Drain evaporating chamber by manually opening
DRAIN valve. Do this by moving lever on valve to
MANUAL position and lock in place.
2. Unscrew probe-rod assembly. Scale should flacke off
easily. Build-up on tips should be scraped off to
remove any mineral residue.
3. Remove the tank cover and wet vac minerals out of
tank (recommended).
4. To remove tank for cleaning, disconnect drain line
union, fill valve supply line, electrical connections to
drain, (disconnecting field wiring in conduit is NOT
recommended,) thermal trip, heaters, fill valve, and
probe. Disconnect steam hose from top of tank and
remove mounting bracket fasteners.
5. Remove evaporating chamber and clean.
6. Install the probe and probe plug assembly. Verify
that ground wire is connected.
7. Replace tank cover, making sure tank is sealed tight.
8. Reconnect drain line union, fill valve supply line,
electrical connections to drain, thermal trip, heaters,
fill valve, and probe. Connect steam hose to top of
tank.
9. Verify drain valve lever is in AUTO position.
10. The CRUV humidifier is again ready to humidify.
Off-Season Shutdown
1. Switch off power.
2. Turn off water supply to make-up valve.
3. Drain evaporating chamber and clean if necessary
(see steps 1 through 9 above).
4. Leave chamber dry, power OFF and water shut-off
valve closed until the next humidification season.
CRUV-DI Humidifier
To Service
1.
Manually open drain valve.
2.
Allow time for the evaporating chamber to cool. If the
tank is hot, cool it down by moving the valve lever
located on the back of the drain valve to the manual
open position – the fill valve will eventually open
allowing cool water to run through the tank until it is
cool enough to handle.
3.
Shut off electrical power to unit.
4.
Shut off water supply to make-up valve.
5.
Make sure evaporating chamber is drained.
6.
Unscrew four cover bolts and remove cover.
7.
Check operation of float valve and low-water cut-out.
8.
Inspect heating elements.
9.
Inspect evaporating chamber and clean if necessary.
10. Inspect cover gasket, and replace if necessary.
11. Replace chamber cover.
12. Verify drain valve is in the closed position.
13. Open water supply valve and turn on electric power.
14. CRUV-DI humidifier is again ready to humidify.
15. If necessary, remove tank as follows:
Remove flexible vapor hose from tank. Close drain
valve. Disconnect unit from drain and supply water
lines. DO NOT DISCONNECT ANY OF THE
ELECTRICAL CONDUITS.
Off-Season Shutdown Procedure
1.
Switch off electrical power to unit.
2.
Check overall appearance of unit.
3.
Shut off water supply to make-up valve.
4.
Drain evaporating chamber by manually opening
drain valve.*
5.
Visually check electrical components of subpanel.
6.
Leave chamber dry, power off, and water shut-off
valve closed until the next humidification season.
* With VAPOR-LOGIC
3
option, the evaporating chamber is automati-
cally drained after 72 hours without a call for humidity when the end-
of-season drain option is ordered.
