Aprilaire 8870 installation instructions Diagram 4 Boiler with AC TWO Transformers

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DIAGRAM 4 – BOILER WITH AC (TWO TRANSFORMERS)

 

 

 

 

 

 

 

 

 

APRILAIRE MODEL

 

 

AIR HANDLER

 

8870 THERMOSTAT

 

 

 

 

 

 

 

 

 

 

120

 

 

 

 

 

C

 

 

 

 

 

 

 

 

R

 

 

L2

VAC

L1

 

RC

 

 

SEE

 

 

 

 

 

RSR

 

 

 

 

 

 

 

 

 

 

 

 

RH

 

 

 

 

24

 

R

 

REMOTE SENSOR(S)

RSA

NOTE

 

 

 

C

 

 

 

 

 

 

 

 

 

 

RSC

 

 

 

VAC

 

 

 

 

 

RSB

 

 

FAN

 

 

G

O

 

 

REF

 

 

RELAY

 

 

 

 

 

 

 

 

 

 

COMMUNICATION

TERMINALS A+

 

 

 

1ST STAGE

 

 

 

 

 

 

Y1

G

 

 

B-

 

 

 

 

COOL

 

 

B+

 

 

 

 

 

 

W1

 

 

 

 

 

 

 

 

 

 

A-

 

 

AIR CONDITIONER

 

Y1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W2

 

 

 

 

 

1ST

 

Y1

 

Y2

 

 

B

 

 

STG

 

 

 

 

 

 

 

 

COOL

 

 

 

 

 

 

 

 

 

 

C

 

BOILER

 

 

 

 

 

 

 

 

 

 

1ST

 

 

 

IMPORTANT!

W1

 

STG

 

 

 

 

 

HEAT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

The thermostat B

 

24

 

 

 

 

terminal is for reversing

 

 

 

 

 

 

VAC

 

 

 

 

valve-heat. DO NOT

R

 

 

 

 

 

connect the B terminal

L1

120

L2

 

 

 

to common side of

 

VAC

 

 

 

 

 

transformer.

NOTE: HVAC installer may need to connect

 

 

 

 

 

 

 

 

 

 

24V AC to the R and C terminals to check the

 

 

 

 

 

HVAC operation. If the Automation system

 

 

 

24V FIELD WIRING

is to be installed after the HVAC installation,

 

 

 

leave the R and C terminals connected to

 

 

 

 

 

 

 

 

FACTORY WIRING

ensure the HVAC system operates. If the

 

 

 

OPTIONAL 24V

automation system is installed before the

 

 

 

HVAC wiring, then DO NOT connect HVAC

19

 

 

FIELD WIRING (SEE NOTE)

 

 

wires to R and C.

 

 

 

 

 

 

 

 

 

 

 

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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

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.