Honeywell PRO TH4110B User manual

Installation
Guide
TH4110B
Programmable Thermostat

Product Application
This thermostat provides electronic control of 24 VAC single-stage heating and cool-
ing systems, or 750 mV heating systems.
System Types
• Gas, oil, or electric heat with air
conditioning
• Warm air, hot water, high-efficiency
furnaces, heat pumps, steam, gravity
• Heat only
• Heat only with fan
• Cool only
• 750 mV heating systems
Power Type
• AA alkaline batteries (2)
System Settings
• Heat, Off, Cool
Fan Settings
• Auto, On
Must be installed by a trained, experienced technician
• Read these instructions carefully. Failure to follow these instructions can dam-
age the product or cause a hazardous condition.
• Check the ratings in this booklet to verify that this product is suitable for your
application (see page 12).
• Always test for proper operation after installation (see pages 8-9).
CAUTION: ELECTRICAL HAZARD
Can cause electrical shock or equipment damage. Disconnect power before
beginning installation.
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.
® U.S. Registered Trademark. Patents pending.
Copyright © 2005 Honeywell International Inc. All rights reserved.

PRO TH4110B Programmable Thermostat
1
Install the thermostat about 5 feet (1.5m) above the floor in an area
with good air circulation at average temperature.
Do not install in locations where the thermostat can be affected by:
• Drafts or dead spots behind doors and in corners
• Hot or cold air from ducts
• Sunlight or radiant heat from appliances
• Concealed pipes or chimneys
• Unheated/uncooled areas such as an outside wall behind the thermostat
NO
NO NO
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Pre-installation checklist ................2
Wallplate installation ......................3
Wiring..............................................4
Wiring diagrams ..............................5
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Fan operation settings ....................6
Battery installation ..........................7
Thermostat mounting ....................7
Installer setup..................................8
Installer system test ........................9
AAppppeennddiicceess
Quick reference to controls..........10
Quick reference to display............10
Compressor protection ................10
In case of difficulty ......................11
Accessories....................................12
Specifications ................................12
Table of contents
Installation tips

Installation Guide
2
Pre-installation checklist
Package contents
Check to make sure your package includes the following items:
Operating manual
Wall anchors and
mounting screws
(2 each)
AA alkaline
batteries (2)
Quick reference card
PRO TH4110B
digital thermostat
(wallplate attached to back)
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)

PRO TH4110B Programmable Thermostat
3
Remove the wallplate from the ther-
mostat as shown at left, then follow
directions below for mounting.
1 Pull wires through wire hole.
2 Position wallplate on wall, level and
mark hole positions with pencil.
3 Drill holes at marked positions as
shown below, then tap in supplied
wall anchors.
4 Place wallplate over anchors, insert
and tighten mounting screws.
5 Insert quick reference card in slot
in front of wall plate.
Grasp top and bottom of wallplate
and pull to remove from thermostat.
Drill 3/16” holes for drywall.
Drill 7/32” holes for plaster.
Wall anchors
Mounting screwsWire hole
Wallplate installation
Insert quick reference card after
wallplate is mounted (see mounting
instructions, below)

Installation Guide
4
Wiring
1 Loosen screw terminals, insert
wires into terminal block, then
re-tighten screws.
2 Push excess wire back into the
wall opening. Keep wires in shaded
area as shown at left.
3 Plug the wall opening with non-
flammable insulation to prevent
drafts from affecting thermostat
operation.
Terminal Designations
WWHeat relay.
YYCompressor contactor.
GGFan relay.
OOHeat pump changeover valve
energized in cooling.
RRccCooling power. Connect to
secondary side of cooling
system transformer.
RRHeating power. Connect to
secondary side of heating
system transformer.
BBHeat pump changeover valve
energized in heating.
Terminal
block
NOTES
R & Rc terminals
In single-transformer system, leave metal
jumper in place between R & Rc. Remove
metal jumper if two-transformer system.
Heat pump systems
If wiring to a heat pump, use a small piece of
wire (not supplied) to connect terminals W
and Y.
Wire specifications
Use 18- to 22-gauge thermostat wire.
Shielded cable is not required.
Keep wires in this
shaded area
CAUTION: ELECTRICAL HAZARD. Can cause electrical shock or equipment damage.
Disconnect power before wiring.
Wiring
Jumper

PRO TH4110B Programmable Thermostat
5
Typical 1H/1C system: 1 transformer Typical 1H/1C system: 2 transformers
Power supply. Provide disconnect means and overload protection as required.
Factory-installed jumper. Remove for 2-transformer systems only.
Use either Oor Bterminals for changeover valve.
Use a small piece of wire (not supplied) to connect Wand Yterminals.
Set fan operation switch to Heat Pump (see page 6) and configure for heat pump (see pg. 8).
Remove jumper
Wiring diagrams
Typical 1H/1C heat pump system Typical heat-only system
Typical heat-only system with fan Typical cool-only system

Installation Guide
6
•GGaassoorrOOiill::For gas or oil heating
systems, leave the fan operation
switch in this factory-set position
(This setting is for systems that
control the fan in a call for heat.)
•EElleeccttrriiccoorrHHeeaattPPuummpp::Change the
switch to this setting for heat
pump or electric heat systems.
(This setting is for systems that
allow the thermostat to control the
fan in a call for heat, if a fan wire is
connected to the GGterminal.)
Set fan operation switch
Fan operation settings

PRO TH4110B Programmable Thermostat
7
Install batteries in back of thermostat
Install two AA alkaline batteries in the
back of the thermostat, as shown at
left.
Fresh batteries should be installed
immediately when the RREEPPLLAACCEEBBAATTTT
warning begins flashing (see page 10.)
The warning flashes about two months
before batteries are depleted.
Even if the warning does not appear,
Batteries should be replaced once a year,
or before the home is left vacant for
more than a month.
Battery installation
Align the 4 tabs on the wallplate with
corresponding slots on the back of the
thermostat, then push gently until the
thermostat snaps in place.
Thermostat mounting

Setup
10
Installation Guide
8
1
5
9
14
15
System type
Heating cycle rate
(CPH: cycles/hour)
Compressor
cycle rate (CPH)
Temperature
display
Compressor
protection
0 Gas, oil or electric heat with air conditioning
1 Heat pump (5 minute compressor off time in heating and cooling)
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
[Other cycle rate options: 2, 4, 6, 7, 8, 10, 11 or 12 CPH]
3 Recommended for most compressors
[Other cycle rate options: 1, 2, 4, 5 or 6 CPH]
0 Fahrenheit
1 Celsius
5 Five-minute compressor off time **See page 10
[Other options: 0, 1, 2, 3 or 4-minute off time]
Setup Function Settings & Options
To begin, press and hold the and
buttons until the display changes
Function number
Press to change settings
Press to advance to next function
Press and hold to exit and save settings
Setting
Installer setup
Follow the procedure below to configure the thermostat to match the installed
heating/cooling system, and customize feature operation as desired.
Installer system test
After completing the installer setup above, press the button again to begin a
system test (see next page).
Press and hold both buttons