425 Coronet Electro-mechanical Timeswitch User Operating Instructions The 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.
The 425 Coronet Timeswitch The simple instructions contained in this user guide are designed to help with the programming and operation of this unit. DIAL TAPPETS ADVANCE CONTROL PROGRAMME SELECTORS TIME POINTER 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. (See diagram opposite).
Setting The On/Off Times The four setting tappets, coloured red and blue, are moved around the circumference of the dial to set your required ON and OFF times. These tappets work in pairs to switch the system ON and OFF. - No 1 (red) 1st ON and No 2 (blue) 1st OFF - No 3 (red) 2nd ON and No 4 (blue) 2nd OFF The tappets may be moved in either direction. (See diagram) Please ensure that you press and hold down any tappet that is to be moved, release tappet only once correct time position has been reached.
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. When the programme selector is in the All Day position, tappets 2 and 3 do not operate.
EXAMPLE: If you turn the system ON again after the preset night shut down time, when you turn it OFF before retiring make sure to operate the advance switch again until the number 4 is displayed in the switch state indicator so that the red tappet number 1 will switch the system ON in the morning. Switch State Indicator DO NOT OPERATE THE ADVANCE SWITCH WHEN A TAPPET IS AGAINST THE TIME LINE.
Programme Override Facilities The following programme options are available: 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) and OFF at tappet 4 (blue) Off - The timer continues to operate but the system will be permanently OFF 6
What is a programmer? ... an explanation for householders. Programmers allow you to set 'On' and 'Off' time periods. Some models switch the central heating and domestic hot water on and off at the same time; while others allow the domestic hot water and heating to come on and go off at different times. Set the 'On' and 'Off' time periods to suit your own lifestyle.
The heating will not work if the room thermostat has switched the heating off. And, if you have a hot-water cylinder, the water heating will not work if the cylinder thermostat detects that the hot water has reached the correct temperature. The above explanation also applies to your timeswitch, which operates as a single circuit programmer. Service and Repair This programmer is NOT user serviceable. Please do not dismantle the unit.