Horstmann CentaurPlus C17 Series 2 Operation instructions

Single Channel Timeswitch
The Horstmann CentaurPlus C17 timeswitch will allow up to 3 ON/OFF
settings per day for each day of the week and has a 1 hour manual boost
and advance button to temporarily override current settings.
There is also a programming switch allowing permanent selection of:
OFF/ON/AUTO/ALL DAY.
CentaurPlus C17 Series 2
User Operating Instructions
1

2
The CentaurPlus C17 Timeswitch
The simple instructions contained in this user guide are designed to help with the
programming and operation of the unit.
1 SET indicator - RUN is the normal position
2 Time of day
3 Switch period symbol
4 SET button
5 BOOST or adjust (-) button
6 ADVANCE or adjust (+) button
7 ENTER button
8 SELECT or COPY button
9 System ON indicator
10 SET positions
11 PROGRAMME positions
12 BOOST symbol
13 ADVANCE symbol
14 AM/PM symbol
15 Day of week indicator
16 PROGRAMME indicator
1 14
10
3
11
12
13
9
4 5 6 7 8
21615

Manual Overrides
BOOST FUNCTION - 1 HOUR TEMPORARY OVERRIDE
The boost facility will allow the user to boost the system which is currently ‘OFF’ for 1 hour.
To indicate the boost being activated BOOST will be shown on the display for the duration
of the boost period. The system ON indicator will also be illuminated.
ADVANCE FUNCTION – BRINGS FORWARD THE NEXT ON OR OFF OPERATION
The advance facility will allow the user to advance the system to ‘ON’ when currently ‘OFF’
or switch the system ‘OFF’ when currently ‘ON’. To indicate the advance feature being
activated ADVANCE will be shown on the display until the next programme switching time.
The system ON indicator will also be illuminated.
3
Press BOOST
button:
Your system will
be boosted for
1 hour
Press ADVANCE
button once to
move to the
next ON/OFF
time
At any time
during a BOOST
period press
BOOST again to
return to normal
programming
To cancel the
advance press the
ADVANCE button
again. This will
return the unit
to its normal
programme
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AUTO
ALL DAY
24 HRS
OFF
AUTO
ALL DAY
24 HRS
OFF
6:35
6:35
PM
PM
RUN
CLOCK
PROG
RUN
CLOCK
PROG
BOOST
ADVANCE

Programme Override Facilities
With the CentaurPlus C17 timeswitch operating in the normal running mode it is possible
to alter the functionality of the programme by means of the SELECT button.
The options include;
AUTO - Timeswitch follows all programmed ‘ON’ and ‘OFF’ times.
ALL DAY - Timeswitch operates from 1st ‘ON’ time until 3rd ’OFF’, ignoring all
switching times in between.
24hrs - Timeswitch will be constantly ‘ON’.
OFF - Timeswitch will be constantly ‘OFF’, there is the ability to turn off the
heating during the summer without altering the programme times.
Boost is still available.
All of the settings above will be permanent, i.e. unaffected by programme times, until
alteration by the user.
The diagram below illustrates how to alter the setting, it assumes that the programme is in
the AUTO mode to begin with.
Press SELECT
once.
Programme
goes from
AUTO to
ALL DAY
Timeswitch
will operate
from 1st ON
until 3rd OFF
period
Press SELECT
again.
Programme
goes from
ALL DAY to
24 HRS
Timeswitch
will be
continuously
ON
Press SELECT
again.
Programme
goes from
24 HRS to OFF
Timeswitch
will be
continuously
OFF
Press SELECT
again.
Programme
goes from
OFF to AUTO
Programme
will return
to normal
ON and OFF
times
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4
AUTO
ALL DAY
24 HRS
OFF
6:35
PM
AUTO
ALL DAY
24 HRS
OFF
6:35
PM
AUTO
ALL DAY
24 HRS
OFF
6:35
PM
AUTO
ALL DAY
24 HRS
OFF
6:35
PM

5
Setting Time of Day and Date
Once the year is set and the
ENTER button is pressed the
process is complete and the
display will return to the run
position
Check that the correct time and day are
showing in the display. If the wrong day is
showing in the display that would indicate
that the date has not been set correctly and
the above process should be repeated
Press the
set button
until the set
indicator
is next to
the ‘clock’
position
Use the
+ and –
buttons
to adjust
the hour
and press
ENTER
Use the
+ and –
buttons to
adjust the
minutes
and press
ENTER
Use the
+ and –
buttons
to set
the date
and press
ENTER
Use the
+ and –
buttons
to set the
month
and press
ENTER
Use the
+ and –
buttons
to set
the year
and press
ENTER
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The CentaurPlus C17 series 2 timeswitch has a built in clock and calendar. This will mean
that you will need to enter the date as well as the time on initial set up or if the factory
re-set has been used. Having done this, the clock will automatically adjust for BST/GMT
time changes throughout the year.
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6
Setting the On and Off Times
To alter these settings please proceed as follows:-
The default time settings shown above are preset at the factory
NB. The factory default settings for the 2nd ON/OFF times are both set at 12:00pm
(midday) which cancels this ‘ON’ period giving 2 ON/OFF periods for the day. If a midday
‘ON’ period is required set the 2nd ON and OFF times accordingly. If not press ENTER twice.
1st ON 1st OFF 2nd ON 2nd OFF 3rd ON 3rd OFF
6.30AM 8.30AM 12.00PM 12.00PM 4.30PM 10.30PM
DEFAULT TIME SETTINGS
Press the
SET button
until SET
indicator
is next
to PROG
position
Repeat this
process for
2nd and 3rd
settings
Use the PLUS and MINUS buttons to
select day required and press COPY.
‘IN’ is displayed to confirm the copy.
Repeat for other days as required
Press ENTER. Use the plus and minus
buttons to select the day required
and press ENTER. Set 1st, 2nd and
3rd times as before. To repeat for
other days go to 2, to copy go to 1
To transfer to independent times
for other days go to 2 or to finish
programming press the SET button
until the SET indicator is in the RUN
position
To finish programming press the SET
button until the SET indicator is in
the RUN position
Use PLUS
and
MINUS
buttons
to adjust
day
Use PLUS
and
MINUS
buttons
to adjust
1st ON
time
Enter the 3rd
OFF time and
the word COPY
is displayed
To set independent
times for other
days go to 2
To follow the copy
route and repeat all
programmed times for
another day go to 1
Use PLUS
and
MINUS
buttons
to adjust
1st OFF
time
Press
ENTER
Press
ENTER
Press
ENTER
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1
2

7
Resetting the Programmer
Electronic equipment can in some circumstances be affected by electrical interference. If
the programmer’s display becomes frozen or scrambled; or if you wish to revert back to
the default time settings please reset by pressing the SET and SELECT buttons together as
shown below.
After initial installation it is advisable, before programming the CentaurPlus for the first
time, to reset the unit. Resetting can only be achieved with the power ‘ON’ by pressing the
SET and SELECT buttons together. This will return the programmer to the factory set default
times.
SET
SELECT
Press the SET and SELECT buttons
together then release the buttons
and the programmer will return to
preset factory settings
General Information
BATTERY
The programmer is fitted with a non-rechargeable, long life battery, which will
maintain the programmed time settings for a minimum of ten months with the supply
disconnected.
THIS SHOULD BE SUFFICIENT TO COVER POWER INTERRUPTIONS DURING THE LIFE OF THE UNIT.
During power interruptions the display will be blank, after 3 days the current time of day
will be lost. These measures are to prolong the battery life.
SERVICE AND REPAIR
This programmer is NOT user serviceable. Please do not dismantle the unit.
In the unlikely event of a fault developing please refer to the RESETTING THE PROGRAMMER
section of this user guide shown above. If this fails to resolve the problem please contact a
local heating engineer or a qualified electrician.

Email: [email protected].uk
Website: www.horstmann.co.uk
Horstmann Controls Limited, Bristol BS4 1UP
Leaflet number P84361 – Issue 1
8
... an explantion 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. On some programmers you
must also set whether you want the heating and hot water to run continuously, run under
the chosen ‘On’ and ‘Off’ heating periods, or be permanently off.
The time on the programmer must be correct. Some types have to be adjusted in Spring
and Autumn at the changes between Greenwich Mean Time and British Summer Time.
You may be able to temporarily adjust the heating programme, for example, ‘Override’,
‘Advance’ or ‘Boost’. These are explained in the manufacturer’s instructions.
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.
What is a programmer?