Aprilaire 8400 Series Safety & Installation Instructions page 7

SETUP & TESTING
SYSTEM SETUP INSTRUCTIONS
(CONTINUED)
Thermostat models 8448 & 8466 have the option of being used in heat pump or heat/cool systems . The equipment
type switch located on the back of the thermostat's face is used to select this . System setting number 00 will only be
shown on these models to display the position of the equipment type switch .
EQUIPMENT
TYPE SWITCH
HEAT PUMP
HEAT/COOL
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SETUP & TESTING
SYSTEM SETUP INSTRUCTIONS
(CONTINUED)
System setting
00 Equipment type (8466, 8448)
(Set by the equipment type switch)
01 Temperature scale
02 Heat/Cool: Fan control in heating
Heat Pump: Auxiliary equipment type
03 Offset temperature for internal sensor
04 Auto changeover mode
05 Outdoor temperature sensor
06 Compressor minimum off time
07 Heating minimum off time
08 Equipment minimum on time
Setting range, default in bold
0 : heat/cool
1 : heat pump
0 : Fahrenheit
1 : Celsius
0 : Gas or oil furnace (Equipment controls fan)
Note: Used for Dual Fuel applications
1 : Electric (Thermostat controls fan)
0° : No offset applied
–4°F to +4°F (–2°C to +2°C)
0 : Auto changeover mode is disabled
1 : Auto changeover mode is enabled
0 : No outdoor temperature sensor attached
1 : Outdoor temperature sensor attached
5 minutes
1 to 5 minutes in 1 minute steps
2 minutes
1 to 5 minutes in 1 minute steps
2 minutes
1 to 5 minutes in 1 minute steps
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