User Manual THR870CUK Programmable Thermostat 50051984-001 Rev.
homexperttm by Honeywell THR870CUK Programmable Thermostat Contents WARNING: This product must be correctly installed and configured to work properly (see pages 20-31). If you are not experienced in wiring electrical equipment, we recommend professional installation to avoid possible personal injury or equipment damage. About your new thermostat Installation and setup What is a programmable thermostat?.....4-5 Features.................................................... 6 QUICK START GUIDE.............
User Manual homexperttm by Honeywell THR870CUK Programmable Thermostat What is a programmable room thermostat? ...an explanation for householders A programmable room thermostat is both a programmer and a room thermostat. A programmer allows you to set ‘On’ and ‘Off’ time periods to suit your own lifestyle.
User Manual homexperttm by Honeywell THR870CUK Programmable Thermostat About your new thermostat QUICK START GUIDE The THR870CUK is an easy-to-use thermostat designed to maintain a comfortable environment when you are at home and reduce energy costs when you are away. Your new thermostat is pre-programmed and ready to go. Just check the steps below and change settings if needed: Features 1 Install and set up thermostat (if this has not been done by a professional installer)...........................
User Manual homexperttm by Honeywell THR870CUK Programmable Thermostat Quick reference Press to set time (see page 9) Current time Date/time settings Current day/date Heating system is on Low battery warning Current room temperature Press to set day/date (see page 9) 12:34 “Day Off” button (see page 16) PM Press to change temperature (see page 15) Press to check target temperature (see page 15) Thu 30/12/10 Press to copy a daily program schedule (see page 13) Status text 23.
Operation and Programming homexperttm by Honeywell THR870CUK Programmable Thermostat Operating modes (auto, manual, off) Heating or cooling control Press and hold both buttons for 5 seconds Thu 30/12/10 12:34 23.5 ° PM Room Temp The thermostat is pre-set to control your heating system. If installed and set up correctly, it can also be used to control your cooling system. To switch between heating and cooling, press and hold the p and q buttons until the screen changes.
Operation and Programming homexperttm by Honeywell THR870CUK Programmable Thermostat Default program schedules To adjust program schedules HEATING This thermostat is pre-set to maintain a comfortable temperature when you are at home, and energy-saving levels when you are away or asleep. The default program schedules are shown below. To change them, see pages 13-18.
Operation and Programming homexperttm by Honeywell THR870CUK Programmable Thermostat To add or remove program time periods You can eliminate any unwanted time periods (2 through 6) if you require fewer than six per day. MON 6:30 21.0 AM SET TIME 1 ° 1 2 3 4 5 6 12:00 SET TIME 3 PM 21.0 1 2 3 4 5 6 ° 1 Press the < or > buttons repeatedly to select a time period (or press the DAY button to select a different day).
Special Functions homexperttm by Honeywell THR870CUK Programmable Thermostat Temporary schedule overrides — Day Off In Day Off mode, the system runs the Sunday program schedule on days when you stay home. The Sunday schedule should maintain a comfortable temperature all day long (see page 12). MON 27/12/10 1 DAYS 1 Press the DAY OFF button. DAYS OFF 2 Press + or - to select the number of days you will stay home (up to 99 days), then press OK to save.
Special Functions homexperttm by Honeywell THR870CUK Programmable Thermostat Temporary schedule overrides — Holiday MON 27/12/10 1 DAYS 10.0 ° Set number of days, then press OK SUN 09/01/11 14 DAYS • Optimum Start: This is an energy-efficient feature that adjusts the start time of your heating system. For example, on cold days your heating system will start earlier to ensure that your home is warm when you wake in the morning. On warmer days, heating will begin later to save energy costs.
Installation and Setup homexperttm by Honeywell THR870CUK Programmable Thermostat Wall bracket installation 1.2 - 1.5 m System installation Installation procedure Location guidelines: 1 Disconnect electric power • 2 Choose thermostat location and install wall bracket Install the wall bracket about 1.2 to 1.5 metres above the floor, where the screen display is easily visible. • Do not install near sources of hot or cold air (radiators, windows, heating or cooling ducts).
Installation and Setup homexperttm by Honeywell THR870CUK Programmable Thermostat Connect system wiring Wiring diagrams 1.0-2.5mm² 6mm max. Connect wiring from your heating or cooling equipment to the thermostat as shown at left. See wiring diagrams on pages 23-24 for details. Combi Boiler 1 Make sure electrical power is off. 24-230V 50-60Hz Basic Boiler THR870C THR870C 24-230V 50-60Hz 2 Strip insulation to expose about 6 mm of bare wire.
Installation and Setup homexperttm by Honeywell THR870CUK Programmable Thermostat Wiring diagrams Activate batteries and attach thermostat cover Zone valve Zone valve THR870C THR870C AUTOMANOFF 230V 50-60Hz 230V 50-60Hz Remove battery compartment cover and discard the plastic tab inside to activate the batteries. The first time you do this, you will be prompted to set the date, time and preferred screen language. NOTE: This symbol will flash on the screen when battery power is low.
Installation and Setup homexperttm by Honeywell THR870CUK Programmable Thermostat System test Installer setup After installation, you should check to make sure the system is working properly. Press OFF, check heating Thu 30/12/10 12:34 23.5 ° PM Room Temp AUTO MAN OFF Thu 30/12/10 35.0 TARGET TEMP ° PM PM 23.
Installation and Setup homexperttm by Honeywell THR870CUK Programmable Thermostat Installer setup functions — Thermostat settings Installer setup functions — Thermostat settings ** Factory default setting Function Description Setting Options ** Factory default setting Function Description Setting Options 1: CL Clock format 24: 24-hour time format ** 12: AM/PM 12-hour time format 8: OP Optimum start 0: Off ** 1: On (see page 19 for description) 2: rP Reset program schedule 0: Schedule cust
Installation and Setup homexperttm by Honeywell THR870CUK Programmable Thermostat Installer setup functions — System settings Customised settings for your system Enter Installer Setup (see page 27), then press > for access to system settings Function Description ** Factory default setting Setting Options 1: Ot Minimum boiler on time 1 minute ** Options: 1 to 5 minutes See page 31 for important information 2: Cr Cycles per hour (CPH) 6 cycles per hour ** Options: 3, 6, 9 or 12 See page 31 for i
Appendix homexperttm by Honeywell THR870CUK Programmable Thermostat In case of difficulty Limited Warranty Thermostat screen is blank • Make sure two fresh AA alkaline batteries are properly installed (see page 25). Heating or cooling system does not respond • Check thermostat batteries (see above). • Make sure heating and cooling systems have power. Check fuses and circuit breakers and replace or reset as needed. • Check wiring (pages 22-24) and system configuration (pages 27-31).
Appendix homexperttm by Honeywell THR870CUK Programmable Thermostat Disposal and recycling Disposal and recycling Batteries and waste electrical products should not be disposed of with household waste. Please recycle where these facilities exist. Check with your local authority or retailer for recycling advice. Please retain these instructions for future reference.
Need Help? For assistance with this product please visit www.homexpertbyhoneywell.com, or call Honeywell Customer Care at 0845 604 2893. ® Honeywell The Arnold Centre Paycocke Road Basildon, Essex SS14 3EA Technical Help Desk: 0845 604 2893 50051984-001 Rev. A www.homexpertbyhoneywell.
