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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.
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%
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.
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 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%
MANUAL MODE
BLOWER ACTIVATION
AUTOMATIC MODE
The Blower Activation feature provided with the Model 63 ADMC turns the
HVAC system fan on when there is a call for humidity.
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.
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