Data Sheet

425 series mechanical programmers are the simplest way to

control hot water and central heating in the home.

Ÿ Simple to use with easily understood settings adjusted in

seconds

Ÿ Rotating 24 hour dial and tappet arrangement

Ÿ Easy to install using a nine pin backplate

Ÿ Advance control to allow manual override ON or OFF

Ÿ Programme options: ON, OFF, All Day or Auto

425 Series

Electro-mechanical Programmers

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425 Series Electro-mechanical Programmers 425 series mechanical programmers are the simplest way to control hot water and central heating in the home.
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Specification 425 DIADEM 425 TIARA & DIADEM This twin circuit, hot water and central heating programmer, with indicator lights, has 16 programmes available for fully pumped systems, including independent programming of heating and hot water and 10 programmes for gravity hot water / pumped heating systems. The Diadem is ideal for gravity systems and fully pumped systems with zone valves. 425 TIARA The Tiara has all the capability and features of the 425 Diadem, but without the indicator lights.