Aprilaire 720 Series - Check the Humidifier Operation - Manual; Humidifier Control; Troubleshooting Guide

To determine the indoor RH, slowly turn the dial clockwise and
counterclockwise and listen for 2 clicks. The indoor RH is within
the range of the 2 clicks.
CHECK THE HUMIDIFIER OPERATION - MANUAL
HUMIDIFIER CONTROL
1. The HVAC system fan must be running for the humidier to
function. Make a heat or fan call at your thermostat.
2. Set the dial to the highest RH set point, make sure that the
water saddle valve is open and that there is electricity to the
humidier.
3. Return control dial to the desired RH set point.
TROUBLESHOOTING GUIDE
TABLE 3: TROUBLESHOOTING GUIDE
Condition
Solution
Condensation on windows
• Reduce humidier control set
point by 1 increment or 5%.
• If humidier is not running,
some indoor activities (cooking,
showers, etc.) may raise the
RH level. If such condensation
persists for several hours or days,
your home should be ventilated
to dissipate excess moisture.
AprilAire offers a line of home
ventilation products.
Lack of humidity
• Ensure doors, windows, and
replace dampers are closed.
• Increase humidier control set
point by 1 increment or 5%.
• Turn on BLOWER ACTIVATION
model (Model 60 only).
• Verify unit is plugged into live
120 VAC outlet and water supply
valve is open.
• If humidier fan does not turn
on, contact your installer or
Technical Support.
Humidier does not
operate
Set control to Test/Reset. Make
certain HVAC system fan is
operating. If unit still does not
operate, consult your HVAC
contractor or contact Technical
Support.
Humidier won’t shut off
Turn dial to OFF. If unit continues
to operate, contact your installer
or Technical Support. If fan runs
continuously and humidity is low,
check for water blockage of orice or
water line.
Humidier is loud
• Switch the fan speed from HIGH
(default) to LOW (see page 6).
• Turn off BLOWER ACTIVATION
mode.
Screen ashes r3, r4, etc.
(Model 60 only)
If the control dial is left in the Test/
Reset position, after 1 minute the
display will ash the software
revision level, e.g., r3.
NOTE: Placing the dial in Test/Reset
resets the HydroCore change timer.
Red Service Required light
ashes (Model 60 only -
see FIGURE 1)
Note the error code on the display
(E1, E2, or E3) and contact your
installer or Technical Support.
Yellow Change Water
Panel light ashes (Model
60 only - see FIGURE 1)
Refer to ANNUAL MAINTENANCE on
page 7 for instructions on changing
the HydroCore, or contact your
installer. After the HydroCore is
replaced, turn the control dial to the
Test/Reset position until the green
Humidier On light ashes, to reset
the HydroCore change timer.
English 5