Honeywell RTH8500 Quick Installation Guide

RTH8500 Series

Small ﬂat head scr

Phillips scr

Pencil

Level

Programmable Thermostat

Following Schedule

Quick Installation Guide

Read and save these instructions.

For help please visit honeywellhome.com

Find rebates: HoneywellHome.com/Rebates

Included in your box

Screws and anchors

UWP™ Mounting System (UWP)

Mode

Heat

Wake Away HomeSleep

Menu FanMode

Fan

Auto

Quick Install Guide

RTH8500 Thermostat

Tools you will need Tools you may need

ewdriver

Wire stripper

Needle-nose pliers Drill and drill bit

Quick Installation Guide

OFF

Removing your old thermostat

1 Turn power OFF.

To protect yourself and your equipment, Turn off the power at the breaker box or switch that controls your heating/cooling system.

2 Check that your system is off.

Change the temperature on your old thermostat. If you don’t hear the system turn on within 5 minutes, the power is off.

Note: If you have a digital thermostat that has a blank display, skip this step

3 Remove the old thermostat’s

faceplate.

On most thermostats, you can take off the faceplate by grasping and gently pulling. Some thermostats may have screws, buttons, or clasps.

Do not remove any wires from your thermostat at this time!

OFF

Switch

Breaker box

4 Make sure there are no 120/240V

wires.

Do you have thick black wires with wire nuts?

Is your thermostat 120V or higher?

If you answered yes to either of these questions, you have a line voltage system and the thermostat will not work.

If you are unsure visit:

honeywellhome.com/support

Wire nut

Thick black wire

RTH8500 Series

1/4” to 3/8”

5 Take a picture of how your wiring

looks right now.

Be sure to include the letters next to the terminals where the wires are inserted. This will be a helpful reference when wiring your thermostat.

Tip: If the color of your wires has faded or if 2 terminals have the same wire color, use the wire labels provided in the package to label each wire.

6 Record if you have wires in the following terminals.

Do not include jumpers as a part of your count. The thermostat does not need jumpers.

Terminal Wire Color

7 Write down the color of the wires.

Check mark the wires that are connected to terminals. Next to the check mark, write down the color of the wire. Do not include jumpers as a part of your

count.

Check all that apply (Not all will apply):

Terminal Wire Color

A or L/A

O/B

W2 or AUX

The RTH8500 thermostat does not support S or U terminals.

If there are wires in terminals that are not listed, you will need additional wiring support. Visit honeywellhome.com/support to find out if the thermostat

will work for you.

Quick Installation Guide

8 Disconnect the wires and remove the old wall plate.

Use a screwdriver to release wires from terminals. Then, use a wire label to identify each wire as it’s disconnected. The letter on the wire label should match the letter on the terminal.

Tip: To prevent wires from falling back into the wall, wrap the wires around a pencil.

Wiring Labels

Apply these wiring labels to each wire with the appropriate terminal designation as you remove it from the existing thermostat.

690823EFS03 • Rev. 0516 • Printed in U.S.A.

Installing your RTH8500 thermostat

RTH8500

Thermostat

Screws

UWP

Mounting

System

Anchors Wall

Étiquettes de ﬁls

Lorsque vous retirez les ﬁls des bornes du thermostat existant, collez ces étiquettes sur chaque ﬁl correspondant

V/VR

AUX

à la lettre de la borne.

V/VR

AUX

Rótulos para los cables

Coloque estos rótulos, con la designación de las terminales, en cada cable al remover los cables del termostato actual.

9 Bundle and insert wires through the UWP.

Pull open the UWP and insert the bundle of wires through the back of the UWP.

Make sure at least 1/4-inch of each wire is exposed for easy insertion into the wire terminals.

RTH8500 Series

10 Insert the wall anchors.

It is recommended that you use the wall anchors included in the box to mount your thermostat.

You can use the UWP to mark where you want to place the wall anchors.

a) Level the wall plate. b) Mark the location of the wall

anchors using a pencil. c) Drill the holes. d) Insert wall anchors.

e) Make sure anchors are ﬂush with

wall.

Tip: If your box contains red anchors, drill 7/32” holes. If your box contains yellow anchors, drill 3/16” holes.

11 Set R-switch position and insert R-wire or wires.

Set the R-switch up or down based on your wiring notes in Step 7.

Insert wires into the inner holes of the terminals on the UWP. The tabs will stay down once the wire is inserted.

If you have 1 R-wire (R,Rh, or Rc)

1. Set R-switch to the up

position.

If you have 2 R-wires (R or Rh, and Rc)

1. Set R-switch to the down

position.

2. Insert your

R-wire (R, Rh or Rc) into R-terminal.

2. Insert your Rc wire

into Rc-terminal

3. Insert your R

or Rh wire into RTerminal.

Quick Installation Guide

12 Connect wires from Step 7.

Depress the tabs to put the wires into the inner holes of their corresponding terminals on the UWP (one wire per terminal) until it is firmly in place.

Gently tug on the wires to verify they are secure.

Tip: If you need to release the wires

again, push down the terminal tabs on the sides of the UWP.

13 Mount the UWP and close the door.

Mount the UWP using the provided screws. Install all three screws into the wall anchors for a secure fit on your wall. Close the door after you’re finished.

14 Confirm wiring matches snapshot.

Please confirm wiring matches terminals from the photo you took in Step 5.

This wiring is just an example,

yours may vary.

Use 3x supplied

screws (#8 11/2

for red anchors

and #6 11/2 for

yellow anchors)

15 Install batteries.

Insert three AA alkaline batteries in the back of the thermostat as shown.

NOTE: The RTH8500 thermostat works in battery mode or normal power mode if a C-wire is available.

16 Attach your thermostat.

Align the thermostat onto the UWP and firmly snap it into place.

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