Large 4.5 square inch LCD with
high contrast for easier reading
Bright, white backlit display is easy
to read
Displays room temperature, temperature
setting and outdoor temperature
simultaneously
Removable battery cover for fast, easy
replacement
Dual Powered...choice of battery-
powered or hardwired, for all applications
Easy-to-wire terminal block
illivolt compatible
Outdoor temperature (requires 8052
outdoor temperature sensor)
Dual fuel operation built in – eliminates
need for a dual fuel kit (requires 8052
outdoor temperature sensor)
Water panel, air filter, dehumidifier and
HVAC service indicators
Simple “set-up” menu to activate
optional features
Soft-touch keys
Circulate fan mode
Compressor lockout protection
Quick reference instructions on board
Display temperature offset (+/-4º)
Fahrenheit & Celsius
Configures as manual heat/cool, or with
auto changeover
5 year warranty
Adjustable differential for 1st, 2nd, 3rd
stage.
PROGRAMMABLE MODELS ONLY
Easy to use temperature control and
override program schedule at anytime
Progressive recovery
Permanent program retention during
power loss
Indefinite setpoint Hold
Choice of 5/1/1 day programmable,
5/2 day
Dimensions
5.25” x 4.50” x 1.00”
Individual Carton: 5.80” x 4.80” x 1.75”
aster Carton: 10 per carton
Thermal Specifications
Control Range: 45º to 99º F (7º to 32ºC)
Display Range: 32º to 99ºF (0º to 40ºC)
Accuracy: +/- 1ºF (+/- .5ºC)
Storage Temperature: -30º to 140ºF (-34.4º to 60ºC)
Operating Humidity: 5% to 90% Relative Humidity
Operating Ambient Temperature: 32º to 120ºF (0º to 48.9ºC)
Shipping Temperature Range: -30º to 140ºF(-34.4º to 60ºC)
Electrical Specifications
24 VAC (18-30 VAC)
1 amp maximum load per terminal
2.5 amp total maximum load (all terminals)
AC Power: 18-30 Volt AC
DC Power: 3.0 Volts DC (2 “AA” Alkaline batteries included)
Standard Systems gas, oil, electric
Single Stage/Heat Pump/ ulti-Stage
illivolt Systems
Terminal Designations: Rc, R, W, Y, G, C, S1, S2, 0/B, L, W2, Y2
Accessories
8052 Outdoor Temperature Sensor
Aprilaire 8400 Series Thermostats
Features Of All 8400 Thermostats
Programmable
8463 - 1H/1C
8465 - HP 2H/1C
Non-Programmable
8444 - 1H/1C
8446 - HP 2H/1C
Universal 8466 - 2H/2C or HP 3H/2C
Universal 8448 - 2H/2C or HP 3H/2C
www.aprilairepartners.com
PO Box 1467 Madison,WI 53701-1467 • Phone–800.334.6011 Fax–608.257.4357
Form No. 5201 08.09
Printed in USA
