DIAGRAM 3 – ROOF TOP UNIT (TWO STAGE HEAT AND TWO STAGE COOL)

ROOF TOP UNIT

 

APRILAIRE MODEL

 

 

 

 

 

SEE

 

120

 

 

8870 THERMOSTAT

 

 

 

NOTE

L2

VAC

L1

 

 

 

C

 

 

 

 

 

 

 

R

RC

 

R

 

 

24

 

 

RSR

 

 

 

 

RH

 

 

 

VAC

 

C

REMOTE SENSOR(S)

RSC

 

 

 

 

 

 

 

 

 

 

 

 

FAN

 

 

 

 

 

RSB

IMPORTANT!

 

 

G

 

 

RSA

RELAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O

 

REF

The B terminal is for

1ST

 

STG

Y1

COMMUNICATION

TERMINALS A+

 

 

 

B terminal to common

STAGE

 

 

W1

G

 

B-

reversing valve-heat.

HEAT

 

 

 

W1

 

B+

DO NOT connect the

 

 

 

 

 

A-

 

 

1ST

 

Y1

 

 

 

 

 

 

 

 

 

 

COOL

 

W2

 

 

side of transformer.

2ND

 

 

 

Y2

 

B

 

 

 

 

 

 

 

 

STAGE

 

W2

 

 

 

 

HEAT

 

 

 

 

 

 

 

 

 

2ND

Y2

 

 

 

 

 

 

STG

 

NOTE: HVAC installer may need to connect

 

 

COOL

 

 

 

 

 

 

24V AC to the R and C terminals to check

 

 

 

 

 

 

 

 

 

 

the HVAC operation. If the automation

 

 

 

 

 

system is to be installed after the HVAC

 

 

24V FIELD WIRING

 

installation, leave the R and C terminals

 

 

 

connected to ensure the HVAC system

 

 

FACTORY WIRING

 

 

 

 

operates. If the automation system is

 

 

 

 

 

 

 

OPTIONAL 24V

 

installed before the HVAC wiring, then

 

 

FIELD WIRING (SEE NOTE)

DO NOT connect HVAC wires to R and C.

18

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Aprilaire 8870 installation instructions Diagram 3 Roof TOP Unit TWO Stage Heat and TWO Stage Cool, Terminal to common

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.