Aprilaire 8400 series Installation Instructions Manual page 12

SETUp & TESTINg
SYSTEm SETUp INSTRUCTIONS
Thermostat models 8448 & 8466 have the option of being used in heat pump or heat/cool systems. Switch SW1
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 SW1 .
Sw1
HEAT PUMP
HEAT/COOL
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61000652A 8400 Tstat Install.indd 12
(CONTINUED)
7/23/09 2:20:58 PM