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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
SETUP & TESTING
System setting Setting range, default in bold
00 Equipment type (8466, 8448)
(Set by the equipment type switch)
0 : heat/cool
1 : heat pump
01 Temperature scale
0 : Fahrenheit
1 : Celsius
02 Heat/Cool: Fan control in heating
Heat Pump: Auxiliary equipment type
0 : Gas or oil furnace (Equipment controls fan)
Note: Used for Dual Fuel applications
1 : Electric (Thermostat controls fan)
03 Offset temperature for internal sensor
0° : No offset applied
–4°F to +4°F (–2°C to +2°C)
04 Auto changeover mode
0 : Auto changeover mode is disabled
1 : Auto changeover mode is enabled
05 Outdoor temperature sensor
0 : No outdoor temperature sensor attached
1 : Outdoor temperature sensor attached
06 Compressor minimum off time
5 minutes
1 to 5 minutes in 1 minute steps
07 Heating minimum off time
2 minutes
1 to 5 minutes in 1 minute steps
08 Equipment minimum on time
2 minutes
1 to 5 minutes in 1 minute steps
SYSTEM SETUP INSTRUCTIONS (CONTINUED)
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