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CentaurPlus ZW and HRT4-ZW
Installation Instructions
The Horstmann CentaurPlus ZW combined wireless room stat and timeswitch
allows a combi boiler system to have a room thermostat added without the
need for any additional wiring.
Replacing the existing timeswitch with the CentaurPlus ZW will allow the room
thermostat to be connected wirelessly producing immediate energy savings in
houses where no previous room thermostat has been fitted.
The device is intended to upgrade existing combi boiler systems that do not
have an existing room thermostat. It is not intended for new installations where
it will be necessary to install two heating zones in order to comply with current
Building Regulations.
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Related Manuals for Horstmann CentaurPlus ZW
Summary of Contents for Horstmann CentaurPlus ZW
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Page 1: Installation Instructions
Replacing the existing timeswitch with the CentaurPlus ZW will allow the room thermostat to be connected wirelessly producing immediate energy savings in houses where no previous room thermostat has been fitted. -
Page 2: For The Installer
WARNING: Isolate mains supply before commencing installation. An example circuit diagram for a typical combi boiler installation is shown below. This diagram is schematic and should be used for guidance only. ROOM STAT Wireless link CentaurPlus ZW TERMINALS L-2 SHOULD NOT BE LINKED MAINS SUPPLY... -
Page 3: Fitting The Backplate
Fitting the backplate Once the backplate has been removed from the packaging please ensure the timeswitch is re-sealed to prevent damage from dust, debris. The backplate should be fitted with the wiring terminals located at the top and in a position that allows a total clearance of at least 50mm around the unit. -
Page 4: Electrical Connections
Earth continuity must be maintained and all bare earth connectors must be sleeved. Ensure no earth conductors are left protruding outside the central space enclosed by the backplate. Internal diagram - C17 -ZW The CentaurPlus ZW has voltage free contacts. A link L-2 is required for mains voltage applications 230V... -
Page 5: Resetting The Timeswitch
Fitting the timeswitch End view of CentaurPlus timer If surface wiring has been used, remove the knockout/insert from the bottom of the timeswitch to accommodate it. Loosen the two ‘captive’ retaining screws on the bottom of the backplate. Now fit the timeswitch to the backplate, ensuring the lugs on the backplate engage with the switch. -
Page 6: General Information
General Information BATTERY The timeswitch is fitted with a non-rechargeable, long life battery, which will maintain the programmed time settings for a minimum of ten months with the supply disconnected. THIS SHOULD BE SUFFICIENT TO COVER POWER INTERRUPTIONS DURING THE LIFE OF THE UNIT. - Page 7 The HRT4-ZW will only operate when 2 x AAA batteries have been fitted and the thermostat is installed and communicating with the CentaurPlus ZW timer/receiver unit. INSTALLATION AND CONNECTION OF THE HRT4-ZW SHOULD ONLY BE CARRIED OUT BY A SUITABLY QUALIFIED PERSON.
- Page 8 N.B. There is a half second delay in switching On and Off on receipt of the commands. There is no ‘click’ from the thermostat which is silent in operation but there will be an audible ‘click’ from the CentaurPlus ZW when it is ‘On’ and the thermostat switches On and Off.
- Page 9 4) Press the dial once and the display should flash ‘E’. 5) Press and hold the ‘Boost’ and ‘Enter’ buttons on the CentaurPlus ZW. 6) Turn the thermostat dial until ‘I’ appears in the display and return to the main instruction.
- Page 10 DIL switch settings - 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.
- Page 11 Fitting the HRT4-ZW Room Thermostat Before final installation it is advisable to commission the product and ensure that the Thermostat and Receiver are communicating satisfactorily. First install the 2 type AAA batteries provided making sure that they are fitted correctly as indicated by the markings in the battery compartment.
- Page 12 Timeswitch specification Thermostat specification CentaurPlus ZW HRT4-ZW Contact Rating 3 (1) Amps 230V AC Power supply 2 x AAA alkaline batteries Contact Type Micro-disconnection changeover Temperature accuracy +/- 0.5°C Voltage free Transmitter frequency 868MHz Supply 230V AC 50Hz only Dimensions 86mm x 86mm x36.25mm...