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Installation Guide
PRO TH4110BProgrammable Thermostat
Product ApplicationThis thermostat provides electronic control of 24 VAC single-stage heating and cooling 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, CoolFan 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 HAZARDCan cause electrical shock or equipment damage. Disconnect power before beginning installation.
MERCURY NOTICEIf 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
Installation tips
Install the thermostat about 5 feet (1.5m) above the floor in an area with good air circulation at an 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
Pre-installation checklist
Package contentsCheck to make sure your package includes the following items:
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)
Wallplate installation
Remove the wallplate from the thermostat as shown at left, then follow the directions below for mounting.
- Pull wires through wire holes.
- Position wallplate on wall, level, and mark hole positions with a pencil.
- Drill holes at marked positions as shown below, then tap in supplied wall anchors.
- Place wallplate over anchors, insert and tighten mounting screws.
- Insert quick reference card in slot in front of the wall plate.
Wiring
CAUTION: ELECTRICAL HAZARD. Can cause electrical shock or equipment damage.Disconnect power before wiring.
Wiring
- Loosen screw terminals, insert wires into the terminal block, then re-tighten screws.
- Push excess wire back into the wall opening. Keep wires in a shaded area as shown at left.
- Plug the wall opening with nonflammable insulation to prevent drafts from affecting thermostat operation.
Terminal DesignationsW Heat relay.Y Compressor contactor.G Fan relay.O Heat pump changeover valve energized in cooling.Rc Cooling power. Connect to the secondary side of the cooling system transformer.R Heating power. Connect to the secondary side of the heating system transformer.B Heat pump changeover valve energized in heating.
Wiring diagrams
- Power supply. Provide disconnect means and overload protection as required.
- Factory-installed jumper. Remove for 2-transformer systems only.
- Use either O or B terminals for the changeover valve.
- Use a small piece of wire (not supplied) to connect W and Y terminals.
- Set fan operation switch to Heat Pump (see page 6) and configure for heat pump (see pg. 8).
Fan operation settings
• Gas or Oil: 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.)• Electric or Heat Pump: 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 G terminal.)
Battery installation
Install two AA alkaline batteries in the back of the thermostat, as shown on the left.
Fresh batteries should be installed immediately when the REPLACE BATT warning begins flashing (see page 10.) The ring 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.
Thermostat mounting
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.
Installer setup
Follow the procedure below to configure the thermostat to match the installed heating/cooling system, and customize feature operation as desired.
| Setup Function
1 System type5 Heating cycle rate (CPH: cycles/hour)9 Compressor cycle rate (CPH)14 Temperature display15 Compressor protection |
Settings & Options0 Gas, oil or electric heat with air conditioning1 Heat pump (5 minute compressor off time in heating and cooling)5 For gas or oil furnaces of less than 90% efficiency1 For steam or gravity systems3 For hot water systems & furnaces of over 90% efficiency9 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 Fahrenheit1 Celsius5 Five-minute compressor off time **See page 10 [Other options: 0, 1, 2, 3 or 4-minute off time] |
Installer system test
After completing the installer setup above, press the 
button again to begin a system test (see next page).
Installer system test
Follow the procedure below to test the heating and cooling system.
- Set SYSTEM switch to Cool.
- Press
to turn on the cooling system, then check system status (see table, below). - Press to turn off the cooling system.
- Set SYSTEM switch to Heat.
- Press to turn on the heating system, then check system status (see table, below).
- Press to turn off the heating system.
- [Optional] Set SYSTEM switch to Off to display thermostat information (see table, below). Press to display 71-76.
- Press and hold to terminate the system test at any time.
to turn on the cooling system, then check system status (see table, below).| System Test10 Heating system30 Cooling system70 Thermostat information (for reference only) | System Status0 Heat and fan turn off.1 Heat turns on. Fan also turns on immediately if Fan OperationThe switch is set to Electric Heat/Heat Pump (see page 6).0 Compressor and fan turn off.1 Compressor and fan turn on.71 Software revision number (major revisions)72 Software revision number (minor revisions)73 Configuration identification code (major)74 Configuration identification code (minor)75 Production configuration date code (week)76 Production configuration date code (year) |
CAUTION: EQUIPMENT DAMAGE HAZARDCompressor protection (minimum off time) is bypassed during testing. To prevent equipment damage, avoid cycling the compressor quickly.
Quick reference to controls
Quick reference to display screen
Built-in compressor protection (Setup Function 15)
This feature helps prevent damage to the compressor in the air conditioning or heat pump system.
Damage can occur if the compressor is restarted too soon after shutdown. This feature forces the compressor to wait for a few minutes before restarting.
During the wait time, the message Cool On (or Heat On if you have a heat pump) will flash on the display. When the safe wait time has elapsed, the message stops flashing and the compressor turns on.
In case of difficulty
If you have difficulty with your thermostat, please try the suggestions below. Most problems can be corrected quickly and easily.
| Display is blank | • Make sure fresh AA alkaline batteries are correctly installed (see page 7). |
| 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). |
| Heating system does not respond (“Heat On” appears on screen) | • Check for 24 Vac at the equipment on the secondary side of the transformer between power and common. If voltage is not present, check the heating equipment to find the cause of the problem.
• Check for 24 Vac between the heat terminal (W) and the transformer common. If 24 Vac is present, the thermostat is functional. Check the heating equipment to find the cause of the problem. • Check for loose or broken wires between the thermostat and the heating equipment. |
| Cooling system does not respond (“Cool On” appears on screen) | • Check for 24 Vac at the equipment on the secondary side of the transformer between power and common. If voltage is not present, check the cooling equipment to find the cause of the problem
• Check for 24 Vac between the cooling terminal (Y) and the transformer common. If 24 Vac is present, the thermostat is functional. Check the cooling system to find the cause of the problem.• Check for loose or broken wires between the thermostat and the cooling equipment. |
| Fan does not turn on in a call for heat | • Make sure the Fan Operation switch is set to the proper system (see page 6). |
| “Cool On” or “Heat On” is flashing | • Compressor protection timeout 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 (see page 10). |
| “Cool On” is not displayed | • Set the System switch to Cool, and set the temperature level below the current room temperature (see page 10). |
Accessories
Please contact your distributor to order accessories.Cover plate assembly ……………………………………..Part Number 50002883-001(Used to cover marks left by old thermostats.)
Specifications
Temperature Ranges• Heat: 40° to 90°F (4.5° to 32°C)• Cool: 50° to 99°F (10° to 37°C)Operating Ambient Temperature• 32° to 120°F (0° to 48.9°C)Shipping Temperature• -20° to 120°F (-28.9° to 48.9°C)Operating Relative Humidity• 5% to 90% (non-condensing)Physical Dimensions• 3-13/16” H x 5-3/8” W x 1-1/4” D• 97 mm H x 137 mm W x 32 mm D
Electrical Ratings
| System | Voltage (50/60Hz) | Running Current |
| Heating | 20-30 Vac | 0.02-1.0 A |
| (Powerpile) | 750 mV DC | 100 mA DC |
| Cooling | 20-30 Vac | 0.02-1.0 A |
Automation and Control Solutions
Honeywell International Inc.1985 Douglas Drive NorthGolden Valley, MN 55422www.honeywell.com/yourhome
Honeywell Limited-Honeywell Limitée35 Dynamic DriveScarborough, Ontario M1V 4Z9
Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers. ® U.S. Registered Trademark. © 2005 Honeywell International Inc. Patents pending. All rights reserved. 69-1769 02 -2005
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