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 the 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 way to do this is to set low temperatures first, say 18ºC 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 chose 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.

OVERVIEW – EXPLANATION FOR HOUSEHOLDER

Your installer has made an excellent choice and installed one of the very latest programmable room thermostats manufactured by Horstman of Bristol.

Full of the latest technology, the C-Stat has been designed to be simple to use and adjust whilst still giving accurate energy saving control over your heating system.

DISPLAY

ACTIVATING THE BACK-LIT DISPLAY

Press any button to illuminate the display. This will remain illuminated for 10 seconds

GENERALINFORMATION$

During programming please note that the display will return to its normal operating screen if the last button press exceeds 10 seconds.

TEMPORARYOVERRIDE

A temporary temperature change can be made at any time. It is also possible to extend how long this temperature override is in operation.

The temperature will revert to its normal programmed setting at the next timed temperature change

TEMPORARY OVERRIDE WITH TIME EXTENSION (Maximum of 4 hours)

The temperature will revert to its normal programmed setting at the next timed temperature change.

PERMANENT OVERRIDE

PERMANENT OVERRIDE – CANCELLATION

SETTING UPTHE C-STAT

Upon initial installation the C-Stat has the following factory default settings

Settings – Monday to Friday 

Settings – Saturday and Sunday 

These can be changed by the installer or the end user at any  time by accessing the MAIN MENU

MAIN MENU

To access the MAIN MENU take the following steps:

MENU OPTIONS 

Setting the PROGRAMME 

Six time and temperature settings are available in each 24 hour period. Pressing BACK at any time in this process will return you to normal operating mode.

If only two different temperature settings are required in 24 hours then set the first time and temperature using programme one (P1) and the second time and temperature setting using programme setting two (P2). The remaining programmes (P3 to P6) should all be set to the same time and temperature as P2.

This same method can be used if three, four or five temperature levels are required, always using the first settings to provide the temperature change commands with the remaining settings that are not required set to the same time and temperature as the last required setting.

To copy the same programmes to other days of the week, please follow the process below 

To exit STANDBY mode, press ENTER TWICE

Setting the HOLIDAY programme 

Pressing BACK at any time in this process will return you to normal operating mode

If the holiday period START date matches today’s date, the, STANDBY temperature will be shown on the display together with the suitcase icon.

If the holiday period START date does not match today’s date the display will remain in normal operating mode but with the suitcase icon appearing on the right of the display. Indicating a holiday period is pending

To cancel a set holiday programme in ADVANCE of its activation, re-programme using the above procedure and set the START date and BACK date to today’s date.

To cancel a set holiday programme during activation press ENTER button twice, the unit will return to normal operating mode and the suitcase icon will disappear.

THE DATES SPECIFIED BECOME EFFECTIVE FROM MIDNIGHTOF THE DAYENTERED

Setting the TIME and DATE

Pressing BACK at any time in this process will return you to normal operating mode

If an incorrect date is entered the wrong day will appear in the normal operating screen.

SETUP MENU

To access the SET UP MENU take the following steps:

MENU OPTIONS

Setting the SELECT CLOCK FORMAT

Select the DAYLIGHT SAVING option 

Pressing BACK at any time in this process will return you to normal operating mode

The default factory setting is for the Daylight saving to be ON giving automatic switching to GMT/BST

Setting the STANDBY TEMPERATURE, LOWER TEMPERATURE LIMIT or UPPER TEMPERATURE LIMI

Pressing BACK at any time in this process will return you to normal operating mode

Setting the TPI cycles

Pressing the BACK at any time in this process will return you to normal operating mode

This feature would normally be set by your installer

Setting the OPTIMUM START

This setting will allow the C-Stat to anticipate the next set temperature and switch on up to two hours in advance to ensure room temperature has been reached by the time the new set temperature applies.

As a consequence the switch on time could take place anywhere between 2 hours and zero before the set time and temperature.

With the optimum start set to OFF the user will need to anticipate the warm up time needed in the programme settings. (Typically the set temperature will be set approx. 1 hour in advance of when it is required)

Pressing the BACK at any time in this process will return you to normal operating mode

Setting the TAMPER SETTING

This setting allows the unit to be locked to the programmes set and can only be reactivated by entering the pin code.

None of the buttons will operate until the security code is entered Pressing BACK at any time in this process will return you to normal operating mode

Cancelling the TAMPER SETTING

Pressing BACK at any time in this process will return you to normal operating mode

If you do not know the release code, contact the Homeowner or Landlord in the first instance.

If you are the Homeowner or Landlord have forgotten the code, contact Horstmann Technical who will be able to provide you with an override code once various security questions have been answered satisfactorily.

RESETTING THE C-STAT

Electronic equipment can in some circumstances be affected by electrical interference.

If the display becomes frozen or scrambled simply press both the BACK and ENTER button simultaneously.

ALL settings made prior to resetting will remain except the Time and Date, which will need to be re-entered.

Details of how to do this can be found on page 14 of this leaflet

BATTERY

The C-Stat 17-B runs on 2 standard AA (Alkaline) non rechargeable batteries and is designed to give a battery life of approximately two years.

approximately two years. The C-Stat 17-M is mains powered and therefore does not require a battery.

There are three stages of warning as the batteries become low in power.

Stage 1 – The battery low symbol will appear in the display
Stage 2 – The words ‘Low Battery’ will appear in the display for 1 second each time a button is operated
Stage 3 – The unit will switch itself OFF and the message ‘Replace Batteries’ will appear permanently in the display.

The batteries should be changed at Stage 2 at the latest.

To replace the batteries of the C-Stat 17-B, please carefully pull down the hinged battery cover on the front of the unit. Ensure they are fitted correctly as indicated by the terminal markings in the battery compartment.

 Please dispose the old batteries responsibly 

SERVICE AND REPAIR

This programmer is NOT user serviceable. Please do not dismantle the unit. In the unlikely event of a fault developing please refer to the RESETTING THE C-STAT on page 23. If this fails to resolve the problem please contact a local heating engineer or a qualified electrician.

Customer Support

Secure Controls (UK) Limited
South Bristol Business Park,
Roman Farm Road, Bristol BS4 1UP
E-mail: sales@horstmann.co.uk
Web site: www.horstmann.co.uk