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NOTE: Refer to the Owner’s Manual for
thermostat operating instructions.
1. PLACE THE THERMOSTAT ON THE BASE.
2. TURN ON POWER TO THE HVAC SYSTEM.
• The display will show the Aprilaire screen for approximately
5 seconds (up to 10 seconds if installed as part of a
Model 6504 Intelligent Zone System).
• After this initial screen the thermostat will enter
operational mode.
3. VERIFY OUTDOOR TEMPERATURE SENSOR CONNECTION
(if optional outdoor temperature sensor installed).
• If an outdoor temperature sensor has been installed
and is operational, an outdoor temperature will appear
on main display.
4. CHECK FAN OPERATION
• Turn on the fan (set to ON).
• The thermostat G terminal will energize and the system
blower will start. The Fan Status on the display will show
“FAN ON.”
• If an AHC has been installed, allow the fan to operate
for no less than 40 seconds. If an AHC is not part of this
installation, you can turn the fan off at any time. A humidity
value can be displayed only after at least 40 seconds of
blower run-time to ensure the humidity reading is
representative of the room air.
• Turn the fan off (set to AUTO).
5. VERIFY AHC CONNECTION (if optional Automatic
Humidifier Control installed).
• Ensure that the AHC has power (the green status light on
the AHC should be on) and make sure the AHC is
functioning properly – see AHC installation procedure for
start up and diagnostics.
• From the Main Screen, press the “INFO” button.
• The outdoor temperature and relative humidity will be
displayed for five seconds after which the contact screen
will be displayed (see page 33 for additional information
on the contact screen).
• When the humidifier is operating, the message
“HUMIDIFIER ON” appears at the message center,
alternating with the time and date and any other currently
active messages.
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