ICI Caldaie RIO 140, Installation And Servicing Manual

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5
TIMER
The timer (mechanical or electronic) fitted to your boiler allows you to control the times of your central
heating periods only. Domestic hot water will always be available, provided the boiler is switched on.
The mechanical timer has a 24 hr. clock setting together with a 12 hr. clock hands display.
The digital electronic display (24 hr. clock) provides a permanent display of the time of day and day of the
week. If the boiler is switched off or its power supply interrupted, a built in battery will operate the display and
protect the programme of operating times etc.
When setting the times for the heating periods it is useful to remember that it might take up to an hour for the
house to become warm, especially in colder weather. Also the effect of the central heating will remain for a
time when the central heating is turned off.
MECHANICAL TIMER - Description and setting (see Fig. 2)
The 24 hr. timer dial has a number of tappets around its edge, each corresponding to 15 minutes. When
tappets (or groups) are set towards the outside of the dial, the timer will be in an 'on' position during that
period and the boiler will provide central heating.
A typical timer setting for a working family could be as follows:-
The groups of tappets between 6.00 and 8.00, and 16.00 and 22.00 set outwards as shown in Fig. 2. This
would provide two 'on' periods for central heating from 6 am to 8 am, then again from 4 pm to 10 pm.
To set the timer to the correct time of day, turn the dial (outer tappet ring) clockwise until the time of day is
against the time indicator arrow head. Fig. 2 shows the timer at midnight (24.00). The timer also has a
conventional 12 hr clock hands display in the centre (do not move the pointer, as it will damage the clock).
IMPORTANT: Do not turn the dial anticlockwise.
The timer has a manual override switch which allows you to override the tappet settings on the timer as
follows:-
1 Set the switch to I and the timer is permanently on, this provides a continuous central heating 'on' period,
ignoring any tappet positions. This setting is useful if you come home late in the evening and the central
heating is 'off'. Do not forget to reset the switch to the (central) position when going to bed or the
house has warmed up.
2 Set the switch to 0 and the timer is permanently 'off' - no central heating.
3 Set the switch to (central) position and your central heating will operate during your pre-set periods.
The manual override switch, shown in Fig. 2, is in the position.
Fig. 2