Honeywell RTH3100C Manual

Contents

1 Basic Installation
2 Advanced Installation
3 Troubleshooting
4 Customer assistance
5 1-year limited warranty
6 Download manual
7 In Other Languages

Basic Installation

Turn Off Power to Heating/Cooling System
Remove Old Thermostat
Remove old thermostat but leave wallplate with wires attached.
Label Wires with Tags
Label the wires using the supplied wire labels as you disconnect them.

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

B	B	Y2	Y2	C	C	E	E	F	F
G	G	H	H	L	L	O	O	P	P
R	R	RC	RC	RH	RH	T	T	U	U
V/VR	V/VR	W	W	W1	W1	W2	W2	W3	W3
X	X	X1	X1	X2	X2	Y	Y	Y1	Y1

Separate Wallplate from New Thermostat
Pull here to remove wallplate from new thermostat.
Mount Wallplate
Mount the new wallplate using the included screws and anchors.
Drill 3/16-in. holes for drywall
Drill 7/32-in. holes for plaster
Connect Wires
Simply match wire labels.

Labels don't match? See "Wiring" in Advanced Installation.
We are here to help.
Call 1-800-468-1502 for wiring assistance.

Install Batteries
Install two AA alkaline batteries.
Install Thermostat onto Wallplate
Install thermostat onto the wallplate on the wall.
Turn Power Back On
Turn the power back on to the heating/cooling system.
Basic installation is...
Complete. Congratulations, you're done!
Continue with advanced installation to fine-tune your thermostat settings.
If you have questions, call us toll-free at 1-800-468-1502.

This thermostat works on 24 volt Heat Pump systems with backup heat. It will NOT work on single-stage heat and cool, 750 mV systems, or 120/240 Volt systems.

Advanced Installation

System setup

Press and hold the and buttons until the screen changes (approximately 5 seconds).
Press to change settings.

Press and hold the and buttons to exit and save settings.
Press to advance to next function.

Function 6 Auxiliary heat cycle rate

Press the button to to select your auxiliary heating system and optimize its operation:

5	For gas or oil furnaces of less than 90% efficiency
1	For steam or gravity systems
3	For hot water systems & furnaces of over 90% efficiency
9	For electric furnaces

Press to change setting.

When correct setting is selected, press to display next function.

Function 8 Emergency heat cycle rate

Press the button to select your emergency heating system and optimize its operation:

9	For electric furnaces
1	For steam or gravity systems
3	For hot water systems & furnaces of over 90% efficiency
5	For gas or oil furnaces of less than 90% efficiency

Press to change setting.

When correct setting is selected, press to display next function.

Function 14 Temperature display

Press the button to select Fahrenheit or Celsius temperature display:

0	Fahrenheit temperature display (°F)
1	Celsius temperature display (°C)

Press to change setting.

Press and hold the and buttons to exit and save settings.

Wiring

If labels do not match letters on the thermostat, check the chart above and connect to terminal as shown here (see notes, below).

If the old thermostat had both V and VR wires, contact a heating/cooling contractor for help.
If the old thermostat had both O and B wires, attach the B wire to the C terminal. If another wire is attached to the C terminal, call 1-800-468- 1502 for help.
If the old thermostat had W1, W2 and Y wires, contact a heating/cooling contractor for help.
If no wire matches the E terminal on the new thermostat, use a small piece of wire to connect terminals E and Aux.

Troubleshooting

If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.

Display is blank	Check circuit breaker and reset if necessary. Make sure power switch at heating & cooling system is on. Make sure furnace door is closed securely. Make sure fresh AA alkaline batteries are correctly installed.
Heating or cooling system does not respond	Press SYSTEM button to set system to Heat. Make sure the temperature is set higher than the Inside temperature. Press SYSTEM button to set system to Cool. Make sure the temperature is set lower than the Inside temperature. Check circuit breaker and reset if necessary. Make sure power switch at heating & cooling system is on. Make sure furnace door is closed securely. Wait 5 minutes for the system to respond.
Temperature settings do not change	Make sure heating and cooling temperatures are set to acceptable ranges: Heat: 40° to 90°F (4.5° to 32°C). Cool: 50° to 99°F (10° to 37°C).
Cool On or Heat On is flashing	Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor.
Heat On is not displayed	Set the System switch to Heat, and set the temperature level above the current room temperature.
Cool On is not displayed	Set the System switch to Cool, and set the temperature level below the current room temperature.

Customer assistance

For assistance with this product, please visit http://DIYthermostats.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.
To save time, please note your model number and date code before calling.

Accessories/replacement parts
To order, please call Honeywell Customer Care toll-free at 1-800-468-1502.

Cover plate*

Part No. 50002883-001

*Use to cover marks left by old thermostats.

1-year limited warranty

If the product is defective, call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Honeywell Return Goods, Dock 4 MN10-3860, 1885 Douglas Dr. N., Golden Valley, MN 55422, or whether a replacement product can be sent to you.