Aprilaire Model 8570 Set to ELEC when the heat source is electric such as strip heat

6504 or AHC – This switch is used to configure the thermostat installation as part of a Model 6504 Intelligent Zone System.

•Set to 6504 only if installing as part of a Model 6504 Intelligent Zone System.

•Set to AHC if the thermostat is to be wired to the HVAC equipment or standard zone system.

GAS or ELEC – When set to ELEC, the fan terminal (G) will be energized on a call for heat.

•Set to ELEC when the heat source is electric (such as strip heat).

•Set to GAS when the heat source is fossil fuel (oil, propane, natural gas). For heat pumps, when set to FOSSIL, the compressor terminal(s) will de-energize before the auxiliary heat terminal (W1) is energized, thus acting as a fossil fuel kit.

MULTI or SINGLE – When set to single, the second stage outputs (Y2 and W2) do not energize.

•Set to SINGLE for single-stage furnace/AC applications or single-stage compressor heat pump systems.

•Set to MULTI if the furnace or air conditioner is two-stage or if the heat pump has a two-stage compressor.

HEAT/COOL or HEAT PUMP – When set to HP the compressor terminal (Y1) is the first stage output for both heating and cooling.

•Set to HP when installed with heat pumps.

•Set to H/C when installed with furnace/AC systems, roof top units or boiler/AC combination systems.

STOP! If installing this thermostat as part of a Model 6504 Intelligent Zone System, refer to the Model 6504 Installation Manual for wiring and checkout procedures. Continue Model 6504 installation with Step 10 (page 30).

If wiring this thermostat directly to the HVAC equipment or standard zone control panel, continue with Step 5.

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