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TABLE 1 – Display Panel (continued)
Indicator Light Function
Solid
Green
Normal Operation. Humidistat is calling for steam
and humidifier is operating.
Solid
Yellow
Humidifier is operating but is not delivering steam
at rated capacity. Occurs if humidifier has operated
for 168 hours at less than rated capacity due to low
water conductivity. Light will turn green once water
conductivity increases and humidifier is delivering
rated capacity.
Flashing
Green
Humidifier is preparing to drain. (Fill valve is open
tempering water in canister.) Occurs when humidifier
is turned off, at end of season drain (72 hours with
no operation) and during forced drain down (168
hours of operation with no drain activity.)
Fill and Drain Valves are pulsing to dislodge mineral
build-up in canister. Flashes 10 times in four seconds.
Solid
Green
Drain valve is energized and open, draining canister.
Valve remains energized for four minutes.
Indicates end of season shut-down. Occurs if
humidifier does not receive call for humidity in 72
hours. Light remains on for 24 hours.
Flashing
Red
Canister has reached the end of its life and needs to
be replaced. Occurs after humidifier has operated for
at least 168 hours and for an additional 24 hours at a
current level below 75% of the maximum operating
current. Humidifier continues to operate, but at
reduced capacity.
Solid
Red
Operational problem with humidifier. Humidifier
shuts down. Occurs when unit detects over-
current which can be caused by failure to drain
or other system failures. Call your heating and air
conditioning dealer for service.
HUMIDIFIER CONTROL & OPERATING INSTRUCTIONS
The control provided with your humidifier is mounted either in your return
air duct or on a wall in the living space. The control has a set of contacts
which close when the RH is below the set point. That signal tells the
humidifier to energize the electrodes in the canister to generate steam,
provided the indoor unit blower is on. If the blower activation relay is
installed, a call for humidity will turn on the indoor unit blower.
It is important to anticipate changes in outdoor temperature and adjust
the setting accordingly to avoid excessive condensation when outdoor
temperature is low. For example, with an outdoor temperature of 20°F the
correct setting will be 35%. If the temperature is expected to fall to 0°F
that evening, then merely reduce the setting to 25% several hours prior to
the temperature change.
See Table 2 for the recommended settings. These settings, which are
based on years of research, represent a compromise between humidity
levels that would be most desirable for comfort and humidity levels that
are suitable for protection of your home and to avoid condensation on
your windows. For example, a wintertime indoor humidity of 50% may be
considered ideal for comfort, but unfortunately, it probably would result
in condensation, which can cause damage to your home. Observing the
recommended humidity levels on your Humidifier Control is an important
safeguard. Condensation of water on the inside surface of windows in
the form of fogging or frost is usually an indication of too much humidity.
This same condensation can occur in other areas in your home, possibly
resulting in damage.
TABLE 2 – Outdoor Temperature/Indoor Relative Humidity
Outside Temperature Recommended RH
+40°F 45%
+30°F 40%
+20°F 35%
+10°F 30%
0°F 25%
–10°F 20%
–20°F 15%