Installation
Guide
RTH3100C
Non-Programmable Digital Thermostat
69-1889EF-1
CAUTION: ELECTRICAL HAZARD
Turn off power at the furnace or the fuse/circuit breaker panel before you begin.
MERCURY NOTICE
If this product is replacing a control that contains mercury in a sealed tube, do not place the old control in the trash. Contact your local waste management authority for instructions regarding recycling and proper disposal.
Need Help?
For assistance with this product please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502
Read and save these instructions.
® U.S. Registered Trademark. Patents pending. Copyright © 2006 Honeywell International Inc. All rights reserved.
RTH3100C
Table of contents |
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Getting started |
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Installation tips........................................... |
2 |
Pre-installation checklist............................ |
3 |
Old thermostat removal |
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Remove old thermostat.............................. |
5 |
Identify and label wires.............................. |
6 |
New thermostat installation |
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Wallplate mounting..................................... |
8 |
Wire connections...................................... |
11 |
Battery installation.................................... |
13 |
Thermostat mounting............................... |
14 |
System setup |
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How to change settings........................... |
15 |
Set auxiliary heat cycle rate..................... |
16 |
Set emergency heat cycle rate................ |
17 |
Set temperature display........................... |
18 |
Appendices |
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In case of difficulty................................... |
19 |
Customer assistance................................ |
21 |
Accessories.............................................. |
21 |
1-year limited warranty............................ |
22 |
Installation Guide
Installation is easy — even if you’ve never done it before!
Your new thermostat has been designed for fast, easy installation. Just follow the simple, step-by-step instructions in the following pages.
Install in three simple steps
•Label wires and remove your old thermostat (see pages 5-7).
•Install and wire your new thermostat (see pages 8-14).
•Set your new thermostat to match your heating/cooling system (see pages 15-18).
Installation tips
•Have everything you need ready to go before you begin (see pages 3-4).
•Do not use wire color as a guide. Use wire labels instead (see page 7).
RTH3100C
PreAbout-installationyour new checklisttrmotat
Check to make sure your package includes the following items:
Wall anchors and mounting screws (2 each)
RTH3100C thermostat |
Operating Manual |
(wallplate attached to back) |
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Wire Labels
Installation Guide
Pre-installation checklist
Required tools & supplies
•No. 2 Phillips screwdriver
•Small pocket screwdriver
•Drill
•Drill bit (3/16” for drywall, 7/32” for plaster)
•Hammer
•Pencil
•Electrical tape
•Level (optional)
•Two fresh AA alkaline batteries
RTH3100C
Remove your old thermostat
1.Turn off power at heating/cooling system (or fuse/circuit-breaker panel).
2.Remove cover and thermostat, but leave wallplate with wires attached.
Leave wallplate in place. |
Is there a sealed tube containing mercury? |
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If so, see inside front cover of this manual |
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for proper disposal instructions. |
Old thermostat
Cover
Installation Guide
Identify wires you will not use
If any wires are not attached to terminals in your old thermostat, do not connect them to your new thermostat.
Wrap the bare metal ends of each unused wire with electrical tape, so it cannot touch and short out other wires.
Do not use unconnected wires.
RTH3100C
Label wires and remove old wallplate
Use a screwdriver to disconnect wires one by one. As you disconnect each wire, wrap it with the label matching the letter on your old thermostat. (Adhesive labels are supplied in your thermostat package.)
Remove the old wallplate only after all wires are labeled. Be careful not to let loose wires fall into the wall opening.
Wrap supplied labels securely around each wire. Do not let wires fall into wall opening!
Aux 
E 
O
IGNORE WIRE COLORS:
Use only letter designations to identify wire types.
Installation Guide
Remove wallplate
Pull at bottom to remove thermostat from wallplate.
HIPS
PULL HERE
Wallplate
RTH3100C
MarkAboutwallplateyour newmountingthermostatposition
1. Pull wires through wallplate.
2. Level wallplate if desired |
3. Mark positions of |
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(lay level across tabs). |
both screw holes. |
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Installation Guide
Mount wallplate
1.Drill holes at pencil-marked locations: 3/16” holes for drywall
7/32” holes for plaster
2.Use hammer to tap anchors into holes until flush with wall.
3.Place wallplate over anchors and insert screws. Check level if desired, then tighten screws.
10
RTH3100C
Connect wires (typical installation)
1.Match each labeled wire with same letter on terminal.
2.Use a screwdriver to loosen screw terminals, insert wires, then tighten screws.
3. Push any excess wire back into the wall opening.
Labels don’t match?
If labels do not match letters on thermostat, see next page.
11
Installation Guide
Connect wires (less common wire designations)
If labels do not match thermostat letters, the chart at right (see notes, below).
the old thermostat had both V 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.
4 |
3 |
3 |
2 |
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1 |
2 |
2 |
E |
Aux |
Y |
G O |
L |
R |
B |
C |
or |
or |
or |
or |
or |
or |
or |
or |
X |
W |
Y1 |
F |
F |
V |
H |
B |
X2 |
W1 |
M |
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VR |
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X |
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W2 |
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E Aux Y G O L R B C
If no wire matches the E terminal on the new thermostat, use a small piece of wire to connect terminals E and Aux.
12
RTH3100C
Install batteries
Install two fresh AA alkaline batteries in back of thermostat.
Back of thermostat
13
Installation Guide
Mount thermostat and restore electrical power
1. Align the 4 tabs on the wallplate with corresponding slots on the back of the thermostat, then push gently until the thermostat snaps into place.
2. Restore electrical power at the heating/cooling system, or at the fuse/circuit-breaker panel.
TIP:
wires interfere when you to mount the thermostat,
push excess wire back into the wall opening.
Wallplate
Thermostat
14
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