BLOWER ACTIVATION
The Blower Activation feature provided with the Model 63 ADMC turns the
HVAC system fan on when there is a call for humidity.
AUTOMATIC MODE
During the first heating season, your ADMC needs to be set to match your
home’s condition. The ADMC default set point is 40% RH. Follow these steps
when adjusting your control.
1. For the first 24 to 48 hours of operation, it may be necessary to adjust the
set point for more or less humidity, depending on your personal comfort
and home’s requirements. Refer to TABLE 6 – ADMC OPERATION GUIDE.
2. During the coldest portion of the first heating season, minor adjustments
may be necessary. This is dependent on your home’s construction. Refer to
TABLE 6 – ADMC OPERATION GUIDE.
TABLE 6 – ADMC OPERATION GUIDE
Condensation on
windows.
Reduce the setting on the control by 5%.
Lack of humidity. Increase the setting on the control by 5%.
Humidifier does not
turn on.
Check that set point is higher than sensed humidity.
Make certain HVAC blower is operating and humidifier is
ON. If humidifier still does not operate consult a heating
contractor.
Humidifier won’t
shut off.
Turn ADMC OFF. If humidifier continues to produce steam
(humidifier steam light ON), disconnect main power to turn
off the humidifier and consult a heating contractor.
“OFF,” “– – –“ and
alarm symbol are
displayed.
The humidity sensor is not connected or is short circuited.
Consult a heating contractor.
“– – –“ is displayed.
The temperature sensor is not connected or is short
circuited. Consult a heating contractor.
The humidity in your home will
now be accurately controlled
to meet your needs and should
not need further adjustment
during future heating seasons.
The Aprilaire ADMC measures
outdoor temperature and
automatically adjusts the set
point to prevent condensation
and damage. TABLE 7 shows
the maximum humidistat set
point the ADMC will allow for
various outdoor temperatures.
MANUAL MODE
If an outdoor temperature
sensor cannot be installed or the
application requires a specific
RH set point, the ADMC can be
configured to Manual Mode. In
Manual Mode, the humidifier
and control will maintain a
constant RH, regardless of
outdoor temperature.
It is important to anticipate a
drop in outdoor temperature
and reduce the setting
accordingly to avoid excess
condensation. See TABLE 8
for the recommended settings.
These settings represent a compromise between humidity levels within the
range of comfort and protection from window condensation. For example, a
50% indoor humidity in wintertime may be ideal for comfort, but would result
in damaging condensation. Thus, observing recommended humidity levels
on the humidifier control is important. Condensation on the inside surface of
windows in the form of fogging or frost is indicative of over-humidification. This
same condensation can occur in other areas of the home, resulting in damage.
TABLE 7 – ADMC MAXIMUM SET POINT FOR
OUTDOOR TEMPERATURE
Outdoor Temperature
°F (°C)
Maximum Setpoint
(%RH)
20 (-7) 35%
10 (-12) 30%
0 (-18) 25%
-10 (-23) 20%
-20 (-29) 15%
TABLE 8 – OUTDOOR TEMPERATURE AND
RECOMMENDED INDOOR RH SETTING
Outdoor
Temperature
Recommended Indoor
RH Setting
+40°F 45%
+30°F 40%
+20°F 35%
+10°F 30%
0°F 25%
-10°F 20%
-20°F 15%
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