Installation and Maintenance
EHU-600 Series Humidifiers
22
Steam generator water levels at given
current and water conductivity
Figure 22-1: Dry, No current
Figure 22-2: Low conductivity, 10 amps
Figure 22-3: High conductivity, 10 amps
1.
Recommended Maintenance Schedule
1 Week after start up
a.
Check unit operation
b.
Look in drain pan for leaks.
c.
Check steam piping for leaks.
d.
Observe duct low points for signs of poor humidity distri-
bution.
1 Month to 1 year
Clean or replace steam generator and/or electrodes. Be sure
unit is draining freely by pushing and holding drain light during
fill cycles.
2.
Water quality and treatment for EHU Series humidifiers
General
The real reason to acquaint yourself with this material is maintenance.
On poor quality water, EHU Series Humidifiers require more maintenance,
also, your water heater, drinking fountains, washers, etc., so this
maintenance is required when you can least afford to perform it.
Hopefully, understanding the problem and possible solutions will help
avoid problems in the first place.
How water affects the EHU: The EHU is an electrode boiler. When no
water is present, the electrodes are separated by air and no current is
conducted. When water contacts the electrodes, the conductive
minerals in the water allows current to flow. Conductivity is the
measure of how conductive the water is and is measured in micromhos
(
µ
mhos/cm
2
). The more conductivity, the lower the water level will be
to draw a given current say, 10 amps.
What affects conductivity? Obviously, minerals dissolved in the
water. Pure distilled water is not conductive. This includes deionized
and reverse osmosis diffusion water treatment. Pure water can't work
in an EHU because it will not allow amperage draw (it's not conductive).
Most tap water is conductive however, so it will work in an EHU. The
type and quantity of minerals can vary greatly depending on the source
of the water (See Chart 23-1).
Maintenance
