Aprilaire 8400 owner manual Operation ALL Models, Change temperature setTING, Press

Operation – ALL MODELS

Select system mode (OFF/HEAT/EM-HEAT/COOL/AUTO)

Press to select:

AUTO: Thermostat automatically selects heating or cooling depending on the indoor temperature.

OFF: Heating and cooling systems are off.

HEAT: Thermostat controls only the heating system.

COOL: Thermostat controls only the cooling system.

EM-HEAT:Thermostat controls emergency/auxiliary heat. Heat pump will not operate. (only for heat pumps with auxiliary heat on models 8446, 8465, and 8466)

Change temperature setTING

Applies to programmable versions (8463, 8465, 8466) when in HOLD mode.

Press or to adjust the current setting.

In AUTO use to switch between the HEAT and COOL setting.

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61000651B 8400 Tstat Owners.indd 6 7/23/09 10:43:03 AM