Thermostat Features; Troubleshooting - Aprilaire 8920W Safety & Installation Instructions

QUICK REFERENCE TO CONTROLS & DISPLAY
INSTALLER MENU
USB SETTINGS
FILE IMPORT, ETC
THERMOSTAT &
HVAC SYSTEM
CONFIGURATION
HUMIDIFIER
CONFIGURATION
DEHUMIDIFIER
CONFIGURATION
EQUIPMENT CONTROL MODULE LEDs
POWER/STATUS – On solid during normal operation . Flashes
when connection to the thermostat is lost and at power-up while
the thermostat connection is being established .
HEATING – On when heating outputs are active .
COOLING – On when cooling outputs are active .
FAN – On when fan output is active .
HUMIDIFIER – On when humidifier output is active .
DEHUMIDIFIER – On when dehumidifier output is active .
VENTILATION – On when ventilation output is active .
AIR CLEANING – On when air cleaner output is active .

THERMOSTAT FEATURES

• Remote access and control over Wi-Fi .
• Indoor air quality control .
– Humidification automatic or manual control .
– Dehumidification .
– Event-Based air cleaning .
™
– Ventilation with temperature and humidity limits .
• Temperature control .
• Heat Blast raises the room temperature 3°F to 5°F .
®
• One touch Away .
• Support for optional wireless outdoor temperature
sensor .
• Large touch screen with adjustable backlight .
• 7 day programmability .
18 English
AIR CLEANER
CONFIGURATION
VENTILATION
CONFIGURATION
IMPORT/EXPORT
USB INSTALLER
SETTINGS FILES,
FACTORY RESET
EQUIPMENT
OUTPUT TESTS
• Displays room temperature, room humidity,
temperature setting, and optional outdoor temperature .
• Air filter, humidifier, dehumidifier, and HVAC service
reminders .
• Programmable fan control with fan circulation mode .
• Easy to use temperature control can override program
schedule at any time .
• Progressive recovery ensures proper temperature at
the start of a program event .
• Built in compressor protection prevents damage to
your equipment .
• System test mode .

TROUBLESHOOTING

DISPLAY IS BLANK
If Power LED is not illuminated at the equipment
control module check the following:
• Check circuit breaker and reset if necessary .
• Make sure power switch at heating & cooling
system is on .
• Make sure furnace door is closed securely .
HEATING SYSTEM DOES NOT RESPOND
("HEATING" APPEARS ON SCREEN)
• Check for 24VAC at the equipment on the secondary
side of the transformer between power and
common . If voltage is not present, check the heating
equipment to find the cause of the problem .
• Check for 24VAC between the heat terminal (W)
and the transformer common . If 24VAC is present,
the thermostat is functional . Check the heating
equipment to find the cause of the problem .
• Check for loose or broken wires between the
thermostat and the heating equipment .
COOLING SYSTEM DOES NOT RESPOND
("COOLING" APPEARS ON SCREEN)
• Check for 24VAC at the equipment on the secondary
side of the transformer between power and
common . If voltage is not present, check the cooling
equipment to find the cause of the problem
• Check for 24VAC between the cooling terminal (Y)
and the transformer common . If 24VAC is present,
the thermostat is functional . Check the cooling
system to find the cause of the problem .
• Check for loose or broken wires between the
thermostat and the cooling equipment .
FAN DOES NOT TURN ON IN A CALL FOR HEAT
• Check Installer Setting Fan Control In Heating /
Heat Pump Auxiliary Type, to make sure the fan
control is properly set to match the type of system .
HEAT PUMP ISSUES COOL AIR IN HEAT MODE,
OR WARM AIR IN COOL MODE
• Check wiring at the terminal block to confirm the
reversing valve is connected to the proper terminal .
O is active in cooling and B is active in heating .
HEAT/COOL BOTH ON AT SAME TIME
• Check Installer Setting Equipment Type, to make
sure it is set to match the installed heating/cooling
equipment .
• Check to make sure heating and cooling wires are
not shorted together .
HEATING EQUIPMENT IS RUNNING IN
COOL MODE
• Check Installer Setting Equipment Type, to make
sure it is set to match the installed heating/cooling
equipment .
"HEATING" IS NOT DISPLAYED
• Check Installer Setting Control Setup is set
correctly .
• Change the System Mode to Heat, and set
the temperature level above the current room
temperature .
"COOLING" IS NOT DISPLAYED
• Check Installer Setting Control Setup is set
correctly .
• Change the System Mode to Cool, and set
the temperature level below the current room
temperature .
English 19