Horstmann 425 Coronet User Manual

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.
Horstmann 425 Coronet
Electro-mechanical Timeswitch
User Operating Instructions
1

Horstmann 425 Coronet Specifications

General

Brand	Horstmann
Model	425 Coronet
Category	Switch
Language	English

Summary

User Operating Instructions

Horstmann 425 Coronet Timeswitch Overview

User operating instructions for the Horstmann 425 Coronet, a single circuit central heating timeswitch.

The 425 Coronet Timeswitch

Setting the Time of Day

Setting the ON/OFF Times

Using Tappets for ON/OFF Switching

Details on using coloured tappets (red for ON, blue for OFF) in pairs to set system ON/OFF times.

Setting Procedure Flow

Step-by-step guide for setting ON/OFF times using tappets and selecting the programme position.

Manual Overrides

Advance Control Operation

Using the advance control to start an ON/OFF period early without altering settings, and its effect on the switch state indicator.

Switch State Indicator Explained

Understanding the switch state indicator which shows the number of the tappet that operated last.

Programme Override Facilities

Available Programme Options

Explanation of programme options: 24 Hrs (permanently ON), All Day, Twice, and Off (permanently OFF).

What is a Programmer?

Service and Repair