homexpert THR870CUK User Manual

User Manual

THR870CUK Programmable Thermostat

50051984-001 Rev. A

homexperttm by Honeywell THR870CUK Programmable Thermostat

About your new thermostat

What is a programmable thermostat? ....4-5

Features ...................................................6

QUICK START GUIDE ............................. 7

Quick reference to controls .......................8

Date/time settings ....................................9

Operation and programming

Heating and cooling control ....................10

Operating modes .................................... 11

Cost-saving program schedules .............12

To adjust program schedules .................. 13

To add or remove program time periods ....14

Special functions

Temporary schedule overrides ................ 15

Day Off mode ......................................... 16

Party mode ............................................. 17

Holiday mode .........................................18

Advanced features ..................................19

Installation and setup

System installation .................................. 20

Wall bracket installation ..........................21

System wiring ....................................22-24

Batteries and cover ................................25

System test ............................................26

Installer setup ....................................27-31

Appendix

In case of difﬁculty .................................. 32

Warranty information ...............................33

Disposal and recycling ............................ 34

Contents

NOTE: This symbol will ﬂash on the screen when battery power is low. Remove cover as shown on page 24 and replace batteries with two fresh AA alkaline batteries.

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.

TIP: After installation, see the QUICK START GUIDE on page 7 to customise and begin using your new thermostat right away.

User Manual

homexperttm by Honeywell THR870CUK Programmable 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. A room thermostat works by sensing the air temperature, switching on the heating when the air temperature falls below the thermostat setting, and switching it off once this set temperature has been reached.

So, a programmable room thermostat lets you choose what times you want the heating to be on, and what temperature it should reach while it is on. It will allow you to select different temperatures in your home at different times of the day (and days of the week) to meet your particular needs.

Turning a programmable room thermostat to a higher setting will not make the room heat up any faster. How quickly the room heats up depends on the design of the heating system, for example, the size of boiler and radiators.

Neither does the setting affect how quickly the room cools down. Turning a programmable room thermostat to a lower setting will result in the room being controlled at a lower temperature, and saves energy.

The way to set and use your programmable room thermostat is to ﬁnd the lowest temperature settings that you are comfortable with at the different times you have chosen, and then leave it alone to do its job. The best

What is a programmable room thermostat?

way to do this is to set low temperatures ﬁrst, say 18°C, and then turn them up by one degree each day until you are comfortable with the temperatures. You won’t have to adjust the thermostat further. Any adjustments above these settings will waste energy and cost you more money.

If your heating system is a boiler with radiators, there will usually be only one programmable room thermostat to control the whole house. But you can have different temperatures in individual rooms by installing thermostatic radiator valves (TRVs) on individual radiators. If you don’t have TRVs, you should choose a temperature that is reasonable for the whole house. If you do have TRVs, you can choose a slightly higher setting to make sure that even the coldest room is comfortable, then prevent any overheating in other rooms by adjusting the TRVs.

The time on the programmer must be correct. Some types have to be adjusted in spring and autumn at the changes between Greenwich Mean Time and British Summer Time.

You may be able to temporarily adjust the heating programme, for example, ‘Override’, ‘Advance’ or ‘Boost’. These are explained in the manufacturer’s instructions.

Programmable room thermostats need a free ﬂow of air to sense the temperature, so they must not be covered by curtains or blocked by furniture. Nearby electric ﬁres, televisions, wall or table lamps may prevent the thermostat from working properly.

User Manual

homexperttm by Honeywell THR870CUK Programmable Thermostat

Your new thermostat is pre-programmed and ready to go. Just check the steps below and change settings if needed:

1 Install and set up thermostat

(if this has not been done by a professional installer) .......................................................... See pages 20-31

2 Select heating (default) or cooling mode ................................................................................... See page 10

3 Customise heating and cooling program settings if necessary .................................................. See page 13

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.

Features

• Energy-saving design: Automatically adjusts indoor temperature up to six times per day to maintain

optimum comfort when you’re at home, and reduce costs during working hours when you are away. Each day of the week can be programmed separately (see pages 12-13).

• One-touch comfort control: Allows you to override programmed settings at any time by setting the

indoor temperature manually (see page 15).

• Day Off button: Sets the system to your preferred Sunday program on any day of the week to maintain a

comfortable environment when you stay home from work (see page 16).

• Party button: Temporarily overrides the normal program schedule for 1 to 23 hours to maintain a

comfortable temperature while you are entertaining guests (see page 17).

• Holiday button: Maintains a cost-saving temperature level for up to 99 days while you are away, then

resumes normal operation when you return (see page 18).

• Summer/Winter time change: Automatically adjusts the clock for standard time or daylight savings time.

• Optimum Start: Automatically turns on heating system as early as needed so indoor temperature reaches

the level you want at the time you set.

QUICK START GUIDEAbout your new thermostat

Display screen options: To change the date, time or display screen language, see pages 9 and 28.

User Manual

homexperttm by Honeywell THR870CUK Programmable Thermostat

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Room Temp

AUTO MAN OFF

Date/time settingsQuick reference

Press to set time (see page 9)

Current day/date

Current time

Heating system is on

Low battery warning

Current room temperature

Status text

Press to set day/date (see page 9)

Press to copy a daily program schedule (see page 13)

“Day Off” button (see page 16)

“Party” button (see page 17)

“Holiday” button (see page 18)

Press to change temperature (see page 15)

Press to check target temperature (see page 15)

Operating modes

(see page 11)

Automatic

Manual

Off

Battery compartment (see page 25)

Press to change program schedules (see page 13)

“OK” button

SET THE DAY

Day OK?

Set the month

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Day Month Year

Press the DAY button to set the date and time.

Use the + or - buttons to set the correct day, then press the OK button. Follow the same procedure to set month, year and time. On completion, the screen will display “Changes saved.”

Date and time should not need to be changed if set properly during initial installation (see page 24).

NOTE: To adjust only the time, press the + or - button. It is not necessary to press the DAY button.

Remove cover to use controls

Operation and Programming

homexperttm by Honeywell THR870CUK Programmable Thermostat

Heating or cooling control

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.

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Press and hold both buttons for 5 seconds

Heating changes to cooling

NOTE: Program schedules for heating and cooling must be set separately (see page 13).

NOTE: The thermostat will not switch to cooling control unless you enable this feature (see page 30).

Room Temp

Cooling

Operating modes (auto, manual, off)

Press the mode buttons to select how the thermostat operates:

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NOTE: You can press any of these buttons — Auto, Manual or Off — to cancel any programming task and exit without saving changes.

Room Temp

AUTO MAN OFF

Auto: Program controls temperature

Manual: Press p/q to set temperature

Auto: In this mode the thermostat follows a program schedule to maintain a comfortable temperature when you are home and reduce energy costs while you are away (see pages 12-13).

Manual: This mode turns off the program schedule to maintain a constant temperature. Press the p or q buttons to set the temperature you want. The temperature will remain at the level you set until you change it, or until you press AUTO to resume the program schedule.

Off: When the thermostat is off, the heating system runs only as needed to maintain a minimum temperature to protect your home. This level is set at 5°C, but you can change it if necessary (see page 28).

+ 13 hidden pages

homexpert THR870CUK User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual