Aprilaire 8870 Wiring the Thermostat, Application Switch #1 Switch #2 Switch #3

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TABLE 2

APPLICATION	SWITCH #1	SWITCH #2	SWITCH #3	SWITCH #4
Single Stage Furnace & AC	Servant	Fossil	Single	H/C

Two Stage Furnace & Two Stage AC	Servant	Fossil	Multi	H/C

Roof Top Unit (Two Stage Heat & Two Stage Cool)	Servant	Fossil	Multi	H/C

Boiler with AC (Two Transformers)	Servant	Fossil	Single	H/C

Single Stage Heat Pump	Servant	Electric	Single	HT. Pump

Two Multi-stage Heat Pump	Servant	Electric	Multi	HT. Pump

First Stage Radiant Floor Heat
Second Stage Furnace One Stage of Cooling	Servant	Fossil	Multi	H/C

7. WIRING THE THERMOSTAT

a)Strip 1/4" of insulation from each wire to be used. Figure 5 shows all wiring terminal definitions.

b)Secure wires into the terminals on the base according to the appropriate wiring diagram (Table 3 ). Use color-coding practices (i.e. white wire to W terminal) whenever possible.

TABLE 3

APPLICATION	DIAGRAM	PAGE #
Single Stage Furnace & AC	1	16

Two Stage Furnace & Two Stage AC	2	17

Roof Top Unit (Two Stage Heat & Two Stage Cool)	3	18

Boiler with AC (Two Transformers)	4	19

Single Stage Heat Pump	5	20

Two Stage Heat Pump	6	21

First Stage Radiant Floor Heat
Second Stage Furnace One Stage of Cooling	7	22

7

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Contents Installation Instructions Installation Instructions Manual Table of Contents WA R N I N G Hvac System PRE-INSTALLATION Check List Model 8870 Thermostat SpecificationsWHAT’S in the BOX Select the Thermostat LocationSTAND-ALONE Thermostat Mounting Criteria With Remote Temperature Sensors DisassemblyMount Base to Wall Shows what each switch corresponds to depending on posi Setting the DIP SwitchesApplication Switch #1 Switch #2 Switch #3 Wiring the ThermostatPage Hvac System Check OUT Reassemble the ThermostatButtons Message Display Scroll SET-UP CHECK-OUT Procedure Optional Hvac SET-UP Features Temperature Control OptionsBalance Points Display Options To Access These Hvac SET-UP FeaturesTo Access These Hvac SET-UP Features Cont Aprilaire Model Thermostat Aprilaire Model Thermostat See Terminal to common Diagram 3 Roof TOP Unit TWO Stage Heat and TWO Stage CoolDiagram 4 Boiler with AC TWO Transformers See Diagram 5 Single Stage Heat PumpThermostat B Terminal is for Diagram 6 TWO Stage Heat PumpConnect the B terminal Page Page Page Aprilaire Automatic Humidifiers Best in Indoor AIR Comfort