C-Stat 17-ZW User Instructions 7 Day Wireless Programmable Room Thermostat and ASR-ZW Receiver Programmable room thermostats are widely recognised as one of the best ways in which to control central heating. Horstmann C-Stat programmable room thermostats have a large display and intuitive user interface, making them easy to set up and use. C-Stat uses a sophisticated time proportional integral (TPI) algorithm for accurate temperature control and energy efficiency.
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. 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 the set temperature has been reached.
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.
C-Stat 17-ZW DISPLAY Actual Room Temperature Day of Week Time of Day Antenna Symbol Until (Time) Set Temperature Back Button 4 Then (Temp) - Button + Button Enter Button
DISPLAY Actual Room Temperature This is the actual room temperature measured by the C-Stat Set Temperature This is the temperature that the C-Stat will allow the room to reach. The temperature range can be set between 5°C and 30°C When the temperature shown in the display is achieved the C-Stat will switch the heating OFF. If the temperature in the room falls below the setting the C-Stat will switch the heating ON.
TEMPORARY OVERRIDE A temporary temperature change can be made at any time. It is also possible to extend how long this temperature override is in operation.
PERMANENT OVERRIDE Press ‘-’ or ‘+’ to adjust temperature Press ENTER New temperature setting will be shown on the display Press the '+' repeatedly until HOLD appears in the display Press ENTER The hours of the UNTIL time will flash Message will appear briefly confirming 'Temperature set until manual release' In the 'HOLD' position the temperature can be overridden by pressing either the '-' or '+' buttons.
SETTING UP THE C-STAT Upon initial installation the C-Stat has the following factory default settings Settings – Monday to Friday Time Target Temperature Period 1 06:00 am 20 °C Period 2 08:30 am 18 °C Period 3 11:30 am 20 °C Period 4 01:30 pm 18 °C Period 5 05:00 pm 21 °C Period 6 10:00 pm 15 °C Settings – Saturday and Sunday Time Target Temperature Period 1 07:00 am 20 °C Period 2 10:00 am 19 °C Period 3 11:30 am 21 °C Period 4 01:30 pm 18 °C Period 5 05:00 pm 21 °C Pe
MAIN MENU To access the MAIN MENU take the following steps: Press ENTER twice Press '-' or '+' to toggle between the menu options MENU OPTIONS Programme Standby Holiday Time / Date Set Up This allows the user to adjust the different time and temperature settings from the factory default settings shown in the table on page 8.
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.
To copy the same programmes to other days of the week, please follow the process below When you have set P6 the message 'To Copy press ENTER' will appear. Press ENTER When complete press BACK to return to normal operating mode The next sequential day will now flash. Press '-' or '+' to select the days you wish to copy the set programmes.
Setting the HOLIDAY programme Pressing BACK at any time in this process will return you to normal operating mode Press '-' or '+' until HOLIDAY appears on the display Press ENTER twice The BACK date will now flash Press the '-' or '+' to adjust to the date you wish the holiday programme to start. Pressing ENTER to change between Day, Month and Year Again, Press the '-' or '+' to adjust to the date you wish the holiday programme to end.
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.
Setting the TIME and DATE Pressing BACK at any time in this process will return you to normal operating mode Press ENTER twice Press '-' or '+' until Time/Date appears on the display The minutes for the time of day will flash Press '-' or '+' to adjust hours then press ENTER Press '-' or '+' to adjust minutes then press ENTER The day of the date will now flash Press ENTER The hours for the time of day will flash Press '-' or '+' to adjust the day to match today's date Pressing ENTER to change betwee
SETUP MENU To access the SET UP MENU take the following steps: Press ENTER twice MENU OPTIONS Press '-' or '+' until Set Up appears on the display Press ENTER Press '-' or '+' to toggle between the menu options detailed below Select clock format This allows the display to show the time in 24 hour or AM/PM format Daylight saving This is the adjustment made in the UK when the clocks go back or forward in the Autumn and Spring.
MENU OPTIONS (Contd...) TPI cycles per hour This setting helps the TPI energy saving software to operate correctly depending on the type of heating system you have Optimum start This calculates the amount of time the CStat may need to switch on in advance of the next target temperature setting in order to meet the requirement. Tamper setting This setting allows a 4 digit release code to be set up to stop unauthorised adjustments being made in multi occupancy buildings.
Setting the DAYLIGHT SAVING 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 Press ENTER twice Press '-' or '+' until Set Up appears on the display Either 'Daylight Saving Off' or 'Daylight Saving On' will appear on the display Press ENTER Press '-' or '+' to toggle between the two options Select your choice by pressing ENTER Press ENTER Press '-' or '+' until Dayli
Setting the STANDBY TEMPERATURE, LOWER TEMPERATURE LIMIT or UPPER TEMPERATURE LIMIT Pressing BACK at any time in this process will return you to normal operating mode Press ENTER twice The temperature setting will now flash Press '-' or '+' to adjust temperature then press ENTER 18 Press '-' or '+' until Set Up appears on the display Press ENTER Press ENTER Press '-' or '+' until the required option appears on the display The unit will now return to the Set Up position, simply press BACK to return
Setting the TPI cycles Pressing the BACK at any time in this process will return you to normal operating mode Press ENTER twice Press '-' or '+' until Set Up appears on the display The current setting will now flash Press ENTER Press '-' or '+' to adjust to the correct setting for your heating system.
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.
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.
Cancelling the TAMPER SETTING Pressing BACK at any time in this process will return you to normal operating mode Press ENTER twice Repeat the previous step for the second, third and fourth digits The following message will appear 'To enter release code press ENTER' Press '-' or '+' to confirm the first digit of the release code, then press ENTER Press ENTER The following message will appear 'Enter first digit' If you do not know the release code, contact the Homeowner or Landlord in the first instance.
If the override is used to override the C-Stat thermostat when it is functioning correctly then the override will be cancelled by the next switching operation of the thermostat and normal operation will be resumed. In any case, with no further intervention, normal operation will be restored within one hour of the override being operated. The Z-Wave wireless communication should be set by your installer on installation.
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, please carefully pull down the hinged battery cover on the front of the unit.
