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Horstmann 425 range Installation Instructions Manual
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Horstmann 425 range Installation Instructions Manual

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Horstmann 425 range
Installation Instructions
The 425 range of traditional electro-mechanical programmers offer a simple
yet effective way of controlling hot water and central heating with the twin
circuit Diadem and Tiara also allowing independent control of both.
INSTALLATION AND CONNECTION SHOULD ONLY BE CARRIED OUT BY A SUITABLY QUALIFIED PERSON
AND IN ACCORDANCE WITH THE CURRENT EDITION OF THE IEE WIRING REGULATIONS.
WARNING : ISOLATE MAINS SUPPLY BEFORE COMMENCING INSTALLATION
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Summary of Contents for Horstmann 425 range

  • Page 1 Horstmann 425 range Installation Instructions The 425 range of traditional electro-mechanical programmers offer a simple yet effective way of controlling hot water and central heating with the twin circuit Diadem and Tiara also allowing independent control of both. INSTALLATION AND CONNECTION SHOULD ONLY BE CARRIED OUT BY A SUITABLY QUALIFIED PERSON AND IN ACCORDANCE WITH THE CURRENT EDITION OF THE IEE WIRING REGULATIONS.

  • Page 2: Fitting The Backplate

    END VIEW OF 425 ELECTRO-MECHANICAL PROGRAMMER Fitting the backplate: Once the backplate has been removed from the packaging please ensure the programmer is re-sealed to prevent damage from dust, debris etc. The backplate should be fitted with the wiring terminals located at the top and in a position which allows the relevant clearances around the programmer (see diagram)
  • Page 3 Diadem/Tiara: When used to control MAINS VOLTAGE SYSTEMS Terminals L, 2 and 5 should be electrically linked by means of a suitable piece of sleeved conductor. When used to control EXTRA LOW VOLTAGE SYSTEMS these links MUST NOT be fitted. MAINS TIMED TIMED...

  • Page 4: Typical Wiring Diagrams

    Other control components shown in the diagrams i.e. valves, room stats etc are general representations only. However the wiring detail can be applied to the corresponding models of most manufacturers, e.g. Horstmann, Honeywell, Danfoss Randall, ACL Drayton etc. Cylinder and Room Thermostat Key:...

  • Page 5: General Information

    Fitting the programmer If surface wiring has been used, remove the knockout/insert from the bottom of the programmer to accommodate it. Loosen the two ‘captive’ retaining screws on the top of the unit. Now fit the programmer to the backplate and line the lugs on the programmer with the flanges on the backplate.
  • Page 6 Tel: 0117 978 8700 Fax: 0117 978 8701 Horstmann is a trading name of Secure Controls (UK) Ltd., a wholly owned subsidiary of Secure International Holdings PTE Ltd. Registered office: Secure House, Moorside Road, Winnall Trading Estate, Winchester, Hampshire SO23 7RX.