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.
Terminal Designations
Not available on all models. If available, use this terminal to connect an optional wire save module (THP9045A1023)
Cooling power. Connect to the secondary side of the cooling system transformer.
Heating power. Connect to the secondary side of the heating system transformer.
1st stage heat relay. Or changeover valve for heat pumps.
1st stage compressor contactor.
Fan relay.
2nd stage heat relay. Or heat pump auxiliary/Emergency heat relay.
2nd stage compressor contactor.
Heat pump system monitor.
Jumper Loop, a plug with a wire loop used to connect the R to the Rc terminals,
Leave jumper loop in place in single transformer systems. Remove (unplug) jumper loop in two transformer systems.
Wiring Instructions
NOTES
Wire specifications:
Use 18- to 22-gauge thermostat wire.
Shielded cable is not required.
Wiring guide — heat pump systems
Wiring Instructions
NOTES
Wire specifications:
Use 18- to 22-gauge thermostat wire. Shielded cable is not required.
Upon initial power up, or after being reset to factory defaults, the initial thermostat options (language, location, and system type) must be set to define the heating/cooling system.
Other options can be customized later.
Follow prompts on the screen to select appropriate options.
From the home screen, touch Menu > System Setup to modify the initial system setup
System Setup Options (MENU > System Setup)
Screen Title | Settings and Options |
Language | English/Français/Español. |
Thermostat installed in | Home/Business (Thermostat is used in a residential (default) or commercial setting). |
Your thermostat location | Touch THERMOSTAT button to display a screen where you can enter a custom name using a keypad. If you have only one thermostat, you can leave the name as THERMOSTAT. For business installations you can check a box to display the thermostat name on the home screen. |
Your thermostat controls | Select Heating or Cooling or both (default). |
Your system type | Select Forced Air (default), Heat Pump, or Hot Water or Steam. Each option offers different choices on the following screens. |
Your forced air heating system type | Select how your forced air system is powered: Gas/Oil (default) or Electric. |
Efficiency of your heating system | Select Standard Efficiency Forced Air (default) or High Efficiency Forced Air. |
Your heating system type | If you selected Hot Water or Steam on “Your system type,” select the specific heating system here. |
Number of cooling stages | Select 1 Stage (default) or 2 Stages. If you are unsure, note which wires are connected: ‘Y’ wire only (1 stage) or ‘Y’ and ‘Y2’. |
Number of heating stages | Select 1 Stage (default) or 2 Stages. If you are unsure, note which wires are connected: ‘W’ wire only (1 stage) or ‘W’ and ‘W2’. |
Your fan control | Select whether your thermostat (default) or heating system controls the fan. |
Type of changeover valve | If you selected Heat Pump on “Your system type,“ select whether it uses a cooling changeover valve (default) or heating changeover valve. |
Number of heat pump compressor stages | Select 1 Stage (default) or 2 Stages. If you are unsure, note which wires are connected: ‘Y’ wire only (1 stage) or ‘Y’ and ‘Y2’. |
Your backup heat | No or Yes (default) |
After the initial setup, walk the homeowner through connecting to a Wi-Fi network. Or, refer the homeowner to the User’s Guide, so the homeowner can connect the thermostat to a Wi-Fi network at a later time.
Screen Title | Settings and Options |
Scheduling Options | Select Non-programmable or Programmable. Programmable uses default or customized programming to automatically raise and lower temperature settings for different times of day. |
Temperature Indication Scale | Select Fahrenheit or Celsius. |
Heating and Cooling System Changeover | Select Manual or Automatic. |
Number of Schedule Periods | Select 2 Periods Per Day or 4 Periods Per Day. |
Pre-occupancy Purge Duration * | Select how long the fan will run before each occupied period: Off, 1, 2, or 3 hours. |
Type of Override * | Select Standard to maintain the programmed periods or Initiate Occupancy to use energy-saving settings until a user presses Start Occupancy. |
Override Duration * | Select how long to maintain temperature during an override: 1-10 hours or No Limit. |
Early Recovery for Heating * | Select No to begin recovery on schedule or Yes to ramp up temperature early. |
Early Recovery for Cooling * | Select No to begin recovery on schedule or Yes to ramp down temperature early. |
Temperature Limits | Select the Minimum Cool and Maximum Heat Limit. |
Keypad Lockout | Select Unlocked/Partially Locked/Locked. |
Clock Format | Select 12 Hour or 24 Hour. |
Daylight Saving Time | Select Off or On. If set to On, the system will automatically change time/date to account for daylight saving. |
Indoor Display Offsets | Select the number of degrees to offset indoor temperature or percentage to offset indoor humidity. |
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 and cooling system is on. • Make sure furnace door is closed securely. • Make sure C wire is connected. |
Cannot change system setting to Cool | • Check that System Setup screen “Your thermostat controls” or “Your system type” is set to match your heating and cooling equipment. |
Fan does not turn on when heat is required | • Check that System Setup screen “Your fan control” is set to match your heating equipment. |
“Wait” appears on the screen | • Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor. |
Heat pump issues cool air in heat mode, or warm air in cool mode | • Check your setting for System Setup screen “Type of changeover valve” to make sure it is properly configured for your system (see page 66). |
Heating or cooling system does not respond | • Touch SYSTEM to set system to Heat. Make sure the temperature is set higher than the Inside temperature. • Touch SYSTEM 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 and cooling system is on. • Make sure furnace door is closed securely. • If “Wait” is displayed, the compressor protection timer is on. Wait 5 minutes for the system to restart safely, without damaging the compressor. |
Heating system is running in cool mode | • Check that System Setup screen “Your thermostat controls” or “Your system type” is set to match your heating and cooling equipment . |
Accessories & replacement parts
Please contact your distributor to order replacement parts.
Cover plate assembly. . . . . . . . . . . . . . . . . . Part Number THP2400A1027B
W-O/B | 20-30 Vac | 1.0 A |
W2 (Aux/E) | 20-30 Vac | 1.0 A |
Y Cooling | 20-30 Vac | 1.0 A |
Y2 Cooling | 20-30 Vac | 1.0 A |
G Fan | 20-30 Vac | 0.5 A |
DISCONNECT POWER BEFORE INSTALLATION. Can cause electrical shock or equipment damage.
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 the Thermostat Recycling Corporation at www.thermostat-recycle.org or 800-238-8192 for information on how and where to properly and safely dispose of your old thermostat.
Need Help?
For assistance with this product please visit http://customer.honeywell.com or call Honeywell Customer Care toll-free at 1-888-235-6569
Automation and Control Systems
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422 Honeywell Ltd
705 Montrichard Avenue Saint-Jean-sur-Richelieu, Québec J2X 5K8
http://customer.honeywell.com
® U.S. Registered Trademark.
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© 2014 Honeywell International Inc.
33-00019EFS—03 M.S. 02-14
Printed in U.S.A.
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