15SBi & 24SBi SYSTEM BOILERS
TWIN CHANNEL DIGITAL
PROGRAMMER INSTALLATION &
OPERATING INSTRUCTIONS
General information is given in the users instruction leaflet despatched with the
appliance and/or on the lighting instruction plate fitted to the appliance.
I AUTO O
RUN DHW CH
M
T
W
Th
F
S
Su
8:37
P
DAY
HR
MIN
ADV
Set
Reset
THESE INSTRUCTIONS APPLY IN THE UK ONLY THESE INSTRUCTIONS
ARE TO BE LEFT WITH THE USER OR AT THE APPLIANCE
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PROGRAMMER OPERATING INSTRUCTIONS
TO SET PRESENT TIME AND DAY
Set right switch to RUN.
Press HR & MIN buttons together (until colon stops flashing)
After 15 seconds the colon will start flashing again signifying the settings cannot be changed. Repeat this step if you still want
to set time and day.
Press DAY button until arrow points to correct day.
Press HR and MIN buttons separately until correct time is displayed.
Set right switch to DHW then back to RUN (or leave for 15 seconds) to start the clock.
Normal run mode
Permanent off
Fig. 2.
Set DHW programme
Set CH programme
Timed programme
Permanent on
I AUTO O
RUN DHW CH
Channel 1 (DHW)
Channel 2 (CH)
Monday to Sunday
M
T
W
Th
F
S
Su
1 2
3
Actual time or set time
8:37
Demand symbol (light bulb)
Advanced symbol
P
DAY
HR
MIN
ADV
Set
Step through programme
Reset
Programmer step number
Advance button
Set actual or
programme day
Set time or
programme hours
Set time or
programme minutes
TO SET PROGRAMME TIMES
This programmer provides eight switch periods per channel, with a day selection of Mon...Fri, Mon...Sat,
Sat/sun, all days together or all days individually. If it is considered confusing to programme all variations, the
following describes two levels of setting the programme; simple or full-function;
SIMPLE PROGRAMME SETTING
The programmer has an in-built programme of ‘standard’ switching times shown in the table. These may be
changed to suit your specific requirements.
PROGRAMME STEP
STANDARD PROGRAMME
DHW MON-FRI CH MON-FRI
1
2
3
4
6.30am
6.30am
8.30am
4.30pm
10.30pm
SAT-SUN
7.00am
8.30am
4.30pm
10.30pm
SAT-SUN
7.00am
5
6
7
8
9.00am
4.00pm
11.00pm
9.00am
4.00pm
11.00pm
2
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Set right switch to DHW.
The display shows weekdays Mon...Fri and the first standard on-time (programme step 1)
Press HR & MIN buttons for your required first on time for the week.
Press
P
Display shows the first standard off-time (programme step 2)
Press HR & MIN buttons for your required off time.
Use buttons P HR and MIN as above for next weekday switch period, then the two weekend
periods, finishing with programme step 8.
Odd programme step numbers are on times and even numbers are off times.
Set right switch to CH and repeat above for all central heating programmes.
Set right switch to RUN.
NOTE: The standard programme also contains further programme steps 9-16. These should be ‘switched off’ ie
the display should flash 0.00 at each of these steps. To check this press P again to view these switch points. If
required, these can be switched off by pressing ADV then P TOGETHER for 5 seconds, then release the buttons.
In case of confusion or errors you can completely reset the programmer. See ‘Reset’ section.
FULL-FUNCTION PROGRAMME SETTING
It is possible to set your programme requirements to 8 switch periods (per channel) over
combinations of days, weeks and weekends.
Set right switch to DHW.
Use the P , DAY, HR and MIN buttons to create the desired programme times as follows;
P to step to the next switch time.
DAY to set the day (or days) at which the switch time occurs
HR & MIN to set the hours and minutes for the switch time.
Set right switch to CH and repeat above for all central heating programmes.
Right switch to RUN.
IMPORTANT NOTES
An ‘odd’ programme step number is always the ON time.
An ‘even’ programme step number is always the corresponding OFF time.
Hence the eight switch periods are programme steps 1-2, 3-4, 5-6, 7-8, 9-10, 11-12, 13-14, 15-16.
The day (or days) setting must be indentical for the on time and corresponding off time.
TO VIEW PROGRAMME TIMES
Set right switch to DHW or CH as required.
Repeatedly press
automatically scrolls through the switch times).
P
to scroll through the on and off times (or keep
P
depressed and the unit
If switch times are to be changed, simply use HR and MIN buttons when displayed.
Set right switch to RUN.
NORMAL RUNNING
Right switch must be in the RUN position
Left switch should be in AUTO position
The programmer will automatically operate according to your set programme periods. In addition
to actual time and day, various smaller characters may also be displayed on the right of the screen.
See Fig 2.
ADVANCE FACILITY
It is possible to change the programme to the next on or off period in advance of the set time.
The switches must be in the AUTO and RUN positions.
3
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To advance HW mode, press ADV once.
To advance CH mode, press ADV twice.
When a channel is ‘advanced’ the
symbol appears at the bottom right of the display, and the channel number
will change to on (or off).
PERMANENT ON
Right switch must be in the RUN position.
Set left slide switch to I.
For permanent HW demand, press ADV once
For permanent CH demand, press ADV twice.
The channel number will flash for 3 seconds and then stay on.
To cancel, set left slide switch back to AUTO
PERMANENT OFF
Right switch must be in the RUN position.
Set left slide switch to O.
For permanent HW off, press ADV once
For permanent CH off, press ADV twice.
When set to permanent off, the selected channel will permanently flash.
To cancel, set left slide switch back to AUTO
RESET
In case of confusion or errors, the programmer can be completely reset by pressing the Reset
button with a small implement such as a biro
The right switch must be in the RUN position.
The display will flash zeros and the programme times will reset to their standard times.
Start again at section ‘To Set Present Time and Day’.
HELPFUL HINTS
G Channel 1 is DHW, channel 2 is CH.
G If you get stuck whilst programming, set right switch to RUN then back to DHW (or CH)
G An ‘odd’ programme step number is always the ON time.
An ‘even’ programme step number is always the corresponding OFF time.
G For every odd number (on time) the corresponding even number (off time) must use the
same day(s).
4
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WORCESTER HEAT SYSTEMS LTD (Bosch Group) Cotswold Way, Warndon, Worcester WR4 9SW.
This booklet is accurate at the date of printing but will be superseded and should be disregarded if specifications
and/or appearances are changed in the interests of continued improvement. All goods sold are subject to our official
Conditions of Sale, a copy of which may be obtained on application
8 716 115 024a (05/08)
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