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User Operating Instructions
Horstmann 425 Tiara/Diadem
Electro-mechanical Programmers
The Horstmann 425 Tiara and Diadem programmers are 2 circuit central
heating and hot water programmers able to switch ON and OFF twice
every 24 hours. An advance switch is provided to make temporary
overrides to the ON or OFF periods and a selector switch gives a further
choice of programmes.
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Summary of Contents for Horstmann 425 Tiara
- Page 1 User Operating Instructions Horstmann 425 Tiara/Diadem Electro-mechanical Programmers The Horstmann 425 Tiara and Diadem programmers are 2 circuit central heating and hot water programmers able to switch ON and OFF twice every 24 hours. An advance switch is provided to make temporary overrides to the ON or OFF periods and a selector switch gives a further choice of programmes.
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Page 2: Product View
The 425 Tiara/Diadem Programmer The simple instructions contained in this user guide are designed to help with the programming and operation of these units. 425 DIADEM INDICATORS DIAL PROGRAMME TAPPETS SELECTORS TIME POINTER ADVANCE CONTROL SWITCH STATE INDICATOR 425 TIARA DIAL PROGRAMME TAPPETS... -
Page 3: Setting On/Off Times
SETTING THE TIME OF DAY The dial rotates clockwise and makes one complete revolution every 24 hours. To set the correct time turn the dial clockwise by hand (using the levers on the clock face) until the correct time of day is against the line marked TIME. -
Page 4: Advance Control
Manual Overrides ADVANCE CONTROL The advance control allows you to start an ON or OFF period early without altering the tappet, time or programme selection settings. Moving the advance control to the extreme right brings forward the operation of the next tappet. The switch state indicator then changes to the appropriate number. When the next tappet passes the time line, normal operation returns. -
Page 5: Programme Override Facilities
PROGRAMME OVERRIDE FACILITIES The hot water (HW) or central heating (CH) may be individually overridden as shown below: (options are limited on gravity systems) 24 Hrs - The system will be permanently ON All Day - The system will switch ON from tappet 1 (red) and OFF at tappet 4 (blue) Tappets 2 and 3 are ignored Twice - The system switches ON at tappet 1 (red), OFF at tappet 2 (blue), ON at tappet 3 (red) -
Page 6: What Is A Programmer
This programmer is NOT user serviceable. Please do not dismantle the unit. In the event of a fault developing please contact a local heating engineer or a qualified electrician Horstmann Controls Limited South Bristol Business Park, Roman Farm Road, Bristol BS4 1UP E-mail: sales@horstmann.co.uk...