Aprilaire 720 Series - Additional Information; Manual Mode; Change Water Panel Indicator; Test;Reset

Condensation or frost on the inside surface of windows
is usually an indication of too much humidity. This same
condensation can occur in other areas in your home, possibly
resulting in damage.
CHANGE WATER PANEL INDICATOR
The control keeps track of humidier operation time. The yellow
Change Water Panel light ashes after a preset amount of
running time has elapsed. This running time is preset by the
installer based on the humidier model and water hardness.
Refer to the ANNUAL MAINTENANCE section for instructions
on changing the HydroCore or call your HVAC contractor for
service. The Change Water Panel indicator light can be reset by
following the Test/Reset instructions.
TEST/RESET
Use the Test/Reset feature to check humidier operation even if
there is no call for humidity, or to reset the Change Water Panel
indicator light.
1. Make sure the water saddle valve is open and that there is
electricity to the humidier.
2. The HVAC system fan must be running for the humidier to
function. Make a heat or fan call at your thermostat.
3. Rotate the dial clockwise to Test/Reset (past the click) and
the Humidier On light will start to blink. The humidier will
operate for one minute.
4. Rotate the dial counterclockwise to set control to original
position. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL
NOT OPERATE AFTER 1 MINUTE HAS ELAPSED.
OPERATING INSTRUCTIONS -
MODEL 720M
Your AprilAire Humidier is controlled by a Model 4655 Manual
Humidier Control (see FIGURE 3). The Manual Humidier Control
is installed either in the cold air return duct or on an interior wall
of the home. With the Manual Humidier Control, it is important
to anticipate a drop in outdoor temperature and reduce the RH
set point accordingly to avoid excessive condensation, just as
with the Digital Humidier Control installed in Manual mode.
ADDITIONAL INFORMATION
• For every 2°F change in outdoor temperature, the Digital
Humidier Control will automatically adjust the indoor RH
by 1%.
• The Automatic Digital Humidier Control will accurately
control the humidity in your home to a maximum of 45% RH.
• The RH values in TABLE 1 are targets based on outdoor
temperature and the Automatic Digital Humidier Control
setting. The actual RH may vary due to conditions in the
home (cooking, showering, etc.).
When installed in the Manual mode (see FIGURE 2 – internal
switch in MAN position and M in the display), it is important
to anticipate a drop in outdoor temperature and reduce the
setting accordingly
to avoid excessive
condensation.
For example, with an
outdoor temperature of
20°F the correct setting
will be 35% RH. If the
temperature is expected
to fall to 0°F, then reduce
the setting to 25%
several hours prior to the
temperature change.
See TABLE 2 for the
recommended settings.
90-1236
FIGURE 2: MODEL 60 ADHC (MANUAL MODE)
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%
TABLE 1: % RELATIVE HUMIDITY GUIDE
Outdoor Temperature (°F)
-10°F 0°F 10°F 20°F 30°F 40°F
Dial Setting
1 10% 10% 10% 15% 20% 25%
Relative Humidity (%)
2 10% 10% 15% 20% 25% 30%
3 10% 15% 20% 25% 30% 35%
4 15% 20% 25% 30% 35% 40%
5 20% 25% 30% 35% 40% 45%
6 25% 30% 35% 40% 45% 45%
7 30% 35% 40% 45% 45% 45%
90-1237
FIGURE 3: MODEL 4655 MANUAL HUMIDIFIER CONTROL
MANUAL MODE
4 English