Horstmann 425 Data Sheet
425 Series
Electro-mechanical Programmers
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
Specification
425 Diadem
425 Tiara
425 Coronet
425 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.
The Tiara is ideally suited for both gravity systems and
fully pumped systems with either mid-position or zone
valves.
425 CORONET
A single circuit timeswitch for straight forward,
accurate time control.
The 425 Coronet is particularly suitable for combi boiler
systems, warm air systems and extra zone control.
Twin Circuit Permanent ON/OFF
Single Circuit
•
• • • • • • •
• • • • • • •
•
ON All Day ON / OFF twice a day
•
•
Combi Boilers Pumped Systems
Gravity HW Independent CH / HW
•
•
•
Immersion Heaters
425 TIARA & DIADEM
CONTACT RATING Double circuit 6 (2.5)
Amps 230V AC
CONTACT TYPE Micro-disconnection
changeover Voltage
Free
MOTOR Synchronous 230V
50Hz
Double Insulated
POWER CONSUMPTION 2.5W
DIRT PROTECTION Normal Situations
MOISTURE PROTECTION Ordinary
ENCLOSURE PROTECTION Ip20
MAXIMUM OPERATING +55°C
TEMPERATURE
DIAL SETTING 2 ON, 2 OFF Tappets
Min. ON/OFF period
45 mins
DIMENSIONS 152mm x 107mm x
39mm
MOUNTING 9 Pin wall fixing plate
425 CORONET
CONTACT RATING Single circuit 13 (6) A
230V AC
CONTACT TYPE Micro-disconnection
changeover Voltage
Free
MOTOR Synchronous 230V
50Hz
POWER CONSUMPTION 2.5W
DIRT PROTECTION Normal Situations
MOISTURE PROTECTION Ordinary
ENCLOSURE PROTECTION Ip20
MAXIMUM OPERATING +55°C
Indicator Lights
TEMPERATURE
•
DIAL SETTING 2 ON, 2 OFF Tappets
DIMENSIONS 152mm x 107mm x
MOUNTING 9 Pin wall fixing plate
Double Insulated
Min. ON/OFF period
45 mins
39mm
South Bristol Park, Roman Farm Road, Bristol BS4 1UP
t: +44 117 978 8700 | f: +44 117 9788701 | e: sales@horstmann.co.uk | www.horstmann.co.uk
Horstmann is a trading name of Secure Controls (UK) Ltd., a wholly owned subsidiary of Secure Holdings PTE Ltd.
Registered office: Secure House, Moorside Road, Winnall Trading Estate, Winchester, Hampshire, SO23 7RX. Registered in England No. 457553
© January 2013: Secure Controls (UK) Ltd: All rights reserved. The company reserves the right to alter product specifications without notice.
Part No. P81252 Issue 6
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