User Operating Instructions
Horstmann 425 Coronet
Electro-mechanical Timeswitch
The Horstmann 425 Coronet timeswitch is a single circuit central heating
timeswitch 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.
1
The 425 Coronet Timeswitch
The simple instructions contained in this user guide are designed to help with the programming and
operation of these units.
DIAL
TAPPETS
ADVANCE
CONTROL
PROGRAMME
SELECTOR
TIME POINTER
2
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