Honeywell THP9045A User manual

Wire Saver Installation

Wire Saver THP9045A

(Optional – for thermostats

without 24-volt C wire)

A wire saver acts as a splitter for

applications that do not include a

24-volt C wire. If your heating/cooling

system does not include a C wire,

install the wire saver in or near the

main unit (furnace, air handler) of

your heating/cooling system.

What tools do I need to install it?

• Small, flat screwdriver

• Two-sided mounting tape (included)

• Thermostat wire bundle, ends

stripped (included)

About the Wire Saver

Before you begin installation, view the video at http://hwll.co/wiresaver

THERMOSTAT

WIRE SAVER

HEATING/COOLING

SYSTEM

Complete Steps 1.1 through 1.6 in the Quick

Start Guide.

• Identify existing wires and verify that there

is no C wire (Quick Start Guide Step 1.2).

If you have a C wire, you do not need to

install the wire saver.

• If your old thermostat has no C wire connector but the wire bundle from your heating/

cooling system includes an extra wire not connected to the old thermostat, you can use

that wire to connect your Wi-Fi thermostat’s C terminal. You do not need to use the wire

saver. Refer to the Alternate Wiring video at wifithermostat.com/videos

Take a photo of the wire connections (Quick Start Guide Step 1.2) or make notes

to carry to your heating/cooling system.

Step 1 Verify that you need a wire saver

Quick Start Guide

Wi-Fi Programmable

Thermostat

RTH6500WF Wi-Fi Series

Important! Ensure that the system is OFF

(Quick Start Guide Step 1.1)

At your new thermostat, for each wire:

1. Loosen the screw, insert wire on inside edge

of thermostat terminal, then tighten screw.

2. Verify wire is firmly secured by gently

pulling on wire.

3. Repeat steps 1 and 2 for all wires.

a. Match the wires labeled R and W to

the R and W terminals.

b. Match the wire labeled Y to the C

terminal.

c. Match the wire labeled G to the K

terminal.

4. Push any excess wire back into the wall

opening after all wires are installed.

Note: The wiring for your application might be different from the wiring shown here.

Step 2 Wire the thermostat

Remove metal jumper

only if you have both R

and Rc wires

MCR35231

W2 GW YR RcKY2 C

HEAT PUMP

CONVENTIONAL

AUX/E

GO/B YRRcKLC

Mount the wire saver to a surface near the terminal block for the heating/cooling system.

a. Locate the terminal block in your heating/cooling

system to which the thermostat wires are attached.

You may need to open or remove the front

panel/door. If you are unsure how to do this,

refer to your heating/cooling system

documentation.

b. Peel paper from one side of the included two-

sided mounting tape.

c. Attach the sticky side to a suitable surface

(such as the furnace wall or floor) that is close

enough to the terminal block for the shortest

wire to reach the wire saver.

d. Peel the paper from the outer surface of the

mounting tape and attach the wire saver with

the terminal block labeled THERMOSTAT at the top.

Step 3 Mount the wire saver

M35224

Rc K C W-O/B

Rc Y G C W-O/B

THP9045A 1023

1326

http://yourhome.honeywell.com

1-800-546-1502

EQUIPMENT

THERMOSTAT

Two-sided mounting tape

Step 4 Select a wire configuration

Examine the labels on the terminal block for the existing thermostat wires.

Determine which of the following combinations matches your setup:

a. Single stage system (1 heat and 1 cooling stage) uses wires R or Rc, Y, G, W

b. Two stage heat, single stage cooling system uses wires R or Rc, Y, G, W, W2

c. Two stages for each heating and cooling uses wires R or Rc, Y, Y2 G, W, W2

If none of these combinations matches what you see, call customer service for further

instructions.

Step 5 Connect the wire saver

Connecting the wire saver involves two main actions: moving some wire connections

from the terminal block in your heating/cooling system to the THERMOSTAT terminal block

of the wire saver and using the included wire bundle to connect the terminal block on the

equipment to the EQUIPMENT block on the wire saver.

To connect the wire saver, follow the instructions and diagram for your setup as

determined in Step 4.

• Follow instructions under 5a if you have a single stage setup.

• Follow instructions under 5b if you have two-stage heat, single-stage cooling.

• Follow instructions under 5c if you have two-stage heating and cooling.

5a Wire single-stage equipment

1. Disconnect the R wire from your heating/cooling system’s terminal block.

2. Connect the R wire to the Rc terminal on the THERMOSTAT end of the wire saver.

3. Disconnect the W wire from the heating/cooling system; connect it to W on the

THERMOSTAT end of the wire saver.

4. Disconnect the G wire; connect it to K on the THERMOSTAT end of the wire saver.

5. Disconnect the Y wire; connect it to C on the THERMOSTAT end of the wire saver.

6. Connect stripped ends of the included wire bundle to the terminals labeled EQUIPMENT

on the wire saver in this color order:

a. Connect red to Rc

b. Connect yellow to Y

c. Connect green to G

d. Connect blue to C

e. Connect white to W

7. Connect the other set of stripped ends to the terminals on your heating/cooling system

following the same color order.

Wiring diagram: Single-stage equipment

When you complete the steps above,

your wire saver and heating/cooling

system will be wired as shown.

Rc K C W-O/B

Rc Y G C W-O/B

THP9045A 1023

1326

http://yourhome.honeywell.com

1-800-546-1502

EQUIPMENT

THERMOSTAT

WIRE BUNDLE

Wire

Saver

M35229

R Y W G C O/B

At Heating/

Cooling System

To Thermostat

5b Wire two-stage heat, single-stage cooling

1. Do not disconnect the W2 wire from your heating/cooling system.

2. Disconnect the R wire from your heating/cooling system’s terminal block.

3. Connect the R wire to the Rc terminal on the THERMOSTAT end of the wire saver.

4. Disconnect the W wire from the heating/cooling system; connect it to W on the

THERMOSTAT end of the wire saver.

5. Disconnect the G wire; connect it to K on the THERMOSTAT end of the wire saver.

6. Disconnect the Y wire; connect it to C on the THERMOSTAT end of the wire saver.

7. Connect stripped ends of the included wire bundle to the terminals labeled EQUIPMENT

on the wire saver in this color order:

a. Connect red to Rc

b. Connect yellow to Y

c. Connect green to G

d. Connect blue to C

e. Connect white to W

8. Connect the other set of stripped ends to the terminals on your heating/cooling system

following the same color order.

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