Aprilaire 8870 Diagram 6 TWO Stage Heat Pump, Thermostat B Terminal is for

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DIAGRAM 6 – TWO STAGE HEAT PUMP

INDOOR HEAT PUMP UNIT

 

 

 

120

 

 

 

 

 

 

L2

 

 

 

 

VAC

 

 

L1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VAC

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FAN

 

 

 

 

 

 

 

 

G

 

RELAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1ST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STAGE

 

W1

 

 

 

 

 

 

HEAT

 

 

 

 

 

 

 

 

 

 

 

 

 

Y1

 

 

 

 

 

 

1ST STAGE

 

2ND

 

 

 

COMPRESSOR

 

 

 

 

 

 

 

 

 

 

 

 

STAGE

 

 

 

 

 

 

 

 

W2

 

HEAT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2ND STAGE

Y2

 

 

 

 

 

 

 

 

 

 

 

COMPRESSOR

 

APRILAIRE MODEL 8870 THERMOSTAT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RC

 

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RSR

 

 

SEE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RH

 

 

 

 

 

 

 

 

 

 

 

REMOTE SENSOR(S)

RSA

 

 

 

 

 

 

 

 

 

 

 

 

RSC

 

 

NOTE

 

 

 

 

 

 

 

 

 

 

RSB

 

 

 

 

 

 

 

 

 

 

 

 

 

O

 

REF

 

 

 

 

 

 

 

 

 

 

 

 

 

COMMUNICATIONTERMINALS A+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G

 

B-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B+

 

 

 

 

 

 

 

 

 

 

 

 

 

W1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A-

 

 

 

 

 

 

 

 

 

 

 

 

 

Y1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y2

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE: HVAC installer may need to connect 24V AC to the R and C terminals to check the HVAC operation. If the automation system is to be installed after the HVAC installation, leave the R and C terminals connected to ensure the HVAC system operates. If the automation system is installed before the HVAC

C

 

W1

 

 

 

 

DEFROST

O

REV

VALVE

COOL

Y1

 

 

 

Y2

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2ND

 

 

 

 

 

 

 

STG

 

 

 

 

 

 

COMP.

 

 

 

 

 

 

 

 

 

 

 

 

 

1ST

 

 

 

 

 

 

REV

STG

 

 

 

 

 

 

VALVE

COMP.

 

 

 

 

 

 

HEAT

 

 

 

 

 

 

 

 

 

 

 

 

IMPORTANT!

The thermostat B

terminal is for

reversing valve-heat. DO NOT connect the B terminal to common side of transformer.

wiring, then DO NOT connect HVAC wires to R and C.

OUTDOOR HEAT PUMP UNIT

24V FIELD WIRING

 

FACTORY WIRING

 

OPTIONAL 24V

 

FIELD WIRING (SEE NOTE)

21

 

Image 23
Contents Installation Instructions Installation Instructions Manual Table of Contents WA R N I N G Hvac System PRE-INSTALLATION Check List Model 8870 Thermostat SpecificationsSTAND-ALONE Thermostat Mounting Criteria WHAT’S in the BOXSelect the Thermostat Location 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 Balance Points Optional Hvac SET-UP FeaturesTemperature Control Options 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

8870 specifications

The Aprilaire 8870 is an advanced smart thermostat that is designed to provide homeowners with precise temperature control, energy efficiency, and ease of use. As an integral part of any modern HVAC system, the 8870 stands out with its sleek design and innovative features that enhance comfort and convenience in everyday living.

One of the most notable features of the Aprilaire 8870 is its Wi-Fi connectivity, which allows users to control their home environment remotely via a smartphone or tablet. This means that homeowners can adjust the temperature, set schedules, and monitor energy usage even when they are away from home. The user-friendly mobile application makes it easy to manage heating and cooling preferences effortlessly.

The touchscreen interface on the 8870 is intuitive, providing a clear display of temperature settings, humidity levels, and system status. The thermostat’s large, easy-to-read screen is backlit, making it convenient for users to operate even in low-light conditions. Additionally, the customizable settings enable users to create personalized schedules based on their lifestyle, promoting energy savings and comfort.

One of the standout technologies integrated into the Aprilaire 8870 is its programmable humidity control. This feature helps maintain optimal humidity levels, enhancing indoor air quality and preventing potential issues such as mold growth and discomfort caused by dry air. By monitoring both temperature and humidity, the thermostat ensures a balanced and healthy indoor environment.

Moreover, the Aprilaire 8870 incorporates energy-saving features such as adaptive scheduling and smart alerts. Adaptive scheduling learns from the homeowner's behavior and adjusts the heating and cooling cycles accordingly. Smart alerts inform users of maintenance needs, filter changes, and extreme temperatures, ensuring that the HVAC system runs efficiently and reliably.

In summary, the Aprilaire 8870 is not just a conventional thermostat; it is a smart home device that optimizes comfort and energy efficiency. With its remote access, programmable settings, humidity control, and user-friendly technology, the 8870 exemplifies how modern thermostats can significantly enhance the home experience. Whether controlling the climate from afar or simply enjoying the ease of a customizable schedule, users can expect improved comfort and lower energy costs with this intelligent thermostat.