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DISpLAy pANEL
TABLE 1 – Display panel
Indicator
Light
Function
Humidifier is turned off or not receiving power .
Off
Solid
Humidifier is turned on .
Green
Humidifier is preparing to turn on . Occurs if power is
Flashing
disconnected, then restored with switch ON . Flashes for
Green
one minute .
Normal Operation . Fill valve is energized allowing water
Solid
to flow into canister via fill cup . (Does not illuminate when
Green
tempering water during drain cycle .)
Flashing
Fill and Drain Valves are pulsing to dislodge mineral build-up
Green
in canister . Flashes 10 times in four seconds .
Fault Mode . Indicates canister needs water but cannot fill .
Solid Red
Humidifier shuts down . (Occurs if high water probe does not
detect water after fill valve is energized for 40 minutes .)
Normal Operation . Humidistat is calling for steam and
Solid
Green
humidifier is operating .
Humidifier is operating but is not delivering steam at rated
capacity . Occurs if humidifier has operated for 168 hours
Solid
at less than rated capacity due to low water conductivity .
yellow
Light will turn green once water conductivity increases and
humidifier is delivering rated capacity .
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
Flashing
operation) and during forced drain down (168 hours of
Green
operation with no drain activity .)
Fill and Drain Valves are pulsing to dislodge mineral build-up
in canister . Flashes 10 times in four seconds .
Drain valve is energized and open, draining canister . Valve
remains energized for four minutes .
Solid
Indicates end of season shut-down . Occurs if humidifier
Green
does not receive call for humidity in 72 hours . Light remains
on for 24 hours .
Canister has reached the end of its life and needs to be
replaced . Occurs after humidifier has operated for at least
Flashing
168 hours and for an additional 24 hours at a current level
Red
below 75% of the maximum operating current . Humidifier
continues to operate, but at reduced capacity .
Operational problem with humidifier . Humidifier shuts
down . Occurs when unit detects over-current which can be
Solid Red
caused by failure to drain or other system failures . Call your
heating and air conditioning dealer for service .
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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
+40°F
+30°F
+20°F
+10°F
0°F
–10°F
–20°F
Recommended RH
45%
40%
35%
30%
25%
20%
15%
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