Horstmann Thermostat Instructions

[Leocricia Castellanos]

Positioningthe C-Stat programmable room thermostat

The C-Stat should be mounted on an internal wall approximately 1.5 meters from floor level and should be in a position away from draughts, direct heat, and sunlight. Ensure that there will be enough space to allow access to the two retaining screws located at the base of the wall plate.

Fitting the wall plate

To remove the wall plate from the C-Stat undo the two retaining screws located on the underside, the wall plate should now be easily removed. Once the wall plate has been removed from the packaging please ensure the C-Stat is resealed to prevent damage from dust, debris, etc. The wall plate should be fitted in a position that allows a total clearance of at least 50mm around the C-Stat programmable thermostat.

Direct Wall Mounting

Offer the plate to the wall in the position the C-Stat is to be mounted and mark the fixing positions through the slots in the wall plate. Drill and plug the wall, then secure the plate in position. The slots in the wall plate compensate for any misalignment of the fixings.

Wiring Box Mounting

The C-Stat wall plate may be fitted directly onto a single gang steel flush wiring box complying with BS4662, using two M3.5 screws. The C-stat is suitable for mounting on a flat surface only; it must not be positioned on an unearthed metal surface.

Electrical Connections

All necessary electrical connections should now be made. Flush wiring can enter from the rear through the aperture in the wall plate. A Pattress is supplied to allow main surface wiring to enter the unit.

The main supply terminals are intended to be connected to the supply by means of fixed wiring. The C-Stat is mainly powered and requires a 3 Amp fused spur. The recommended cable size is 1.0mm. The C-Stat is double insulated and does not require an earth connection, an earth connection block is provided on the backplate for terminating any cable earth conductors. Earth continuity must be maintained and all bare earth conductors must be sleeved. Ensure that no conductors are left protruding outside the central space enclosed by the backplate.

C-Stat replacing a conventional room thermostat on a fully pumped system with an existing programmer and two spring return valves with auxiliary switches All wiring diagrams are schematic and should be used for guidance only.

INSTALLATION AND CONNECTION OF THE C-STAT MUST BE CARRIED OUT BY A SUITABLY QUALIFIED PERSON.

WARNING: ISOLATE MAINS SUPPLY BEFORE COMMENCING INSTALLATION

TPI Temperature control software

Thermostats using TPI (Time Proportional Integral) control algorithms will reduce the temperature swing that normally occurs when using traditional bellows or thermally operated thermostats. As a consequence, a TPI-regulating thermostat will maintain the comfort level far more efficiently than any traditional thermostat. When used with a condensing boiler, the TPI thermostat will help to save energy as the control algorithm allows the boiler to operate in a condensing mode more consistently compared to older types of thermostats.

Fitting the C-Stat to the wall plate

Complete the installation by swinging the C-Stat into position by engaging the lugs at the top of the wall plate before pushing it firmly home into its plug-in terminal block. Tighten the 2 captive screws on the underside of the unit. Now ensure that the heating system is responding to the On/Off commands from the C-Stat. Explain its operation to the householder and hand over the users operating instructions to the user.

Resetting the thermostat

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 buttons simultaneously.

Adding them to the Z-Wave system is straight forward so long as you follow the instructions and wait for the thermostat to wakeup so that configuration settings are saved correctly. For this application note, I have used VERA to illustrate the process, other controllers will be very similar.

To get the most out of the Thermostat and enable easy use within scenes and rules it is best to directly associate the Thermostat with the Receiver. This means that the thermostat can directly control the receiver without having to communicate via the Z-Wave controller. It also means that the Thermostats's TPI control software is used to efficiently control your heating, help to save money and reduce wasted energy (see TPI Configuration below).

The Secure SRT321 and Horstmann HRT4-ZW Thermostats include TPI (Time Proportional Integral) software algorithms that enable the thermostat to control the heating much more efficiently than a simple On/Off thermostat. The TPI algorithms reduce over temperature over swing and reduce the times the heating is turned On and Off, helping to reduce heating costs and wasted energy.

The Secure Receiver includes a Fail Safe mode that prevents the receiver staying ON if it loses contact with the Secure Thermostat. The receiver can only enter Fail Safe mode when the receiver is On - it does not get activated when it is OFF.

Prior to disconnecting anything I tested the terminals in the old programmer and thermostats for Live so I knew where Live was coming to the thermostats and the programmer when the different channels came on when I turned on the heating and called for hot water.

Today I just noticed that when I turn on the heating downstairs with the wired thermostat, the relay in the wireless receiver also turns on which also opens the valves for the heating upstairs. This does not happen when I turn on the heating upstairs with the downstair valves.

So in the app, after changing the ground floor heating zone option to 'no zone controller (independent)'. The wireless receiver relay for the central heating no longer turns on when I turn on the heating downstairs.

Hi, I have a very similar set up (the only difference being that my ch 1+2 on the Horstmann are the other way around i.e my channel 1 on the Horstmann is house rads, whereas I think yours was UFH and my Ch 2 is UFH whereas yours was rads).

Can I ask why you connected the spare wire (the one that was connected to terminal 4 on the Horstmann) to a connector in the wiring centre that provided Live rather than to Live in the Tado wireless reciever?

Essentially you just need to wire it as per the installation instructions for an S plan system (don't forget the bridges!) and add the second zone controlled by the add smart thermostat (wired) to the L supply on the receiver.:

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.

During programming please note that the display will return to its normal operating screen if the last button press exceeds 10 seconds.TEMPORARYOVERRIDEA temporary temperature change can be made at any time. It is also possible to extend how long this temperature override is in operation.

To access the SET UP MENU take the following steps:MENU OPTIONSSelect clock formatThis allows the display to show the time in 24 hour or AM/PM formatDaylight savingThis is the adjustment made in the UK when the clocks go back or forward in the Autumn and Spring.When using the C-Stat in the UK the daylight saving ON setting should be selected which will automatically adjust the GMT/BST times accordinglyStandby temperatureThis is the temperature setting used when in Standby or Holiday mode (Min 5C / Max 30C)In cold weather the heating will activate if the temperature being measured falls below this temperature setting.Lower temperature limitThis sets the lowest temperature setting the C-Stat will allow to be programmed.The default setting is 5CUpper temperature limitThis sets the highest temperature setting the C-Stat will allow to be programmedThe default setting is 30CTPI cycles per hourThis setting helps the TPI energy saving software to operate correctly depending on the type of heating system you haveOptimum startThis calculates the amount of time the C- Stat may need to switch on in advance of the next target temperature setting in order to meet the requirement.Tamper settingThis setting allows a 4 digit release code to be set up to stop unauthorised adjustments being made in multi occupancy buildings.Setting the SELECT CLOCK FORMAT

Select the DAYLIGHT SAVING option Pressing BACK at any time in this process will return you to normal operating modeThe default factory setting is for the Daylight saving to be ON giving automatic switching to GMT/BST

Pressing the BACK at any time in this process will return you to normal operating modeOil Boilers3 cycles per hourGas Boilers6 cycles per hourNot used9 cycles per hourElectric Heating12 cycles per hourThis feature would normally be set by your installer

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

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