Worcester 24SiII Installation And Servicing Instructions page 63

The test feature enables you to quickly run through the programme which has been set and
check that all is correct with both the programme and the system.
Pressing the YES button in response to TEST? selects the test mode.
Pressing and holding down the YES button starts the clock fast running until it reaches the first
switching time when the output changes and the display halts to show the time of switching and
the output state.
If you continue to hold down the YES button the display will continue to fast run, after a few
seconds, until the next switching time.
If you stop pressing the YES button the unit will stay in that mode until the YES button is
pressed again.
In this way you can run through the days programme or, if you hold down the YES button, the
whole weeks programme.
Pressing the SET button, at any time, returns the unit to the normal run mode.
OPERATIONAL NOTES
Switching:
The switching options for the central heating are
OFF
TWICE
ONCE
ON
Operation of the SELECT button moves the arrow to the option required.
Mixing Once or Twice Options:
To have the Central Heating twice on some days and once on others, programme the twice days
as normal. For the other days set ON1 and then OFF1, ON2 and OFF2 at the desired off time.
Set the SELECT button to TWICE.
One Day Off:
If you want the appliance to be off on a particular day, set the relevant ON1 and OFF1 to the
same time and the ON2 and OFF2 to the same time later in the day. Set the SELECT button to
ONCE or TWICE.
Central Heating Shutdown:
Set the SELECT button to OFF. This does not affect the programme.
Advance:
Advance is only operational in the ONCE or TWICE modes and is cancelled at the next
programme time.
Hot Water Supply:
Hot water is available whenever a tap or shower is turned on. The supply of hot water takes
priority over the delivery of heat to the central heating system for the period that the hot water
is required.
TO TEST THE PROGRAMME
Off all the time
On for two periods each day
On for one period each day (ON1 to OFF2)
On all the time.
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