Horstmann CentaurPlus C21 User manual

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The unit display has become frozen
The indicator neon fails to illuminate on
Hot water or Central heating channel
The indicator neon will illuminate but
the pump and/or boiler fails to
operate
There is no display on the
programmer
How do I know if the programmer is
still under warranty
How is the programmer removed from
the wall
This could be due to local electrical interference
Using the RESET procedure may rectify the fault.
Using the RESET procedure may rectify the fault. If the problem persists the programmer
will need replacing.
This may indicate a problem elsewhere in your system;
E.g. A zone valve, etc. please contact a registered installer for advice.
Try the RESET procedure on page 2, if this fails to rectify the problem please have the
mains supply checked
The CentaurPlus range comes with a 2 year guarantee from the date of
manufacture. This date is located on the rear of the unit, indicated by a month over a
year
WWAARRNNIINNGG::The CentaurPlus programmer must only be removed from it’s backplate by
either a qualified electrician or heating engineer; The programmer plugs in to a 6 pin
backplate located on the rear of the unit and is secured using 2 screws located on the
bottom surface of the unit. Undo these screws and pull forward and up in an arc motion
LEAFLET No P60497
ISSUE 4
FRONT VIEW OF PROGRAMMER
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1.SET indicator
2.Time of day
3.Switch Period symbol
4.SET Button
5.Hot water BOOST or adjust (-) button
6.Central heating ADVANCE or adjust (+) button
7.Hot water (HW) select or ENTER Button
8.Central heating (CH) select button
9.Hot water ON indicator
10.Central heating ON indicator
11.SET positions
12.PROGRAMME positions
13.BOOST symbol
14.ADVANCE symbol
15.AM/PM symbol
16.PROGRAMME indicators
BBAATTTTEERRYY
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.
SSEERRVVIICCEEAANNDDRREEPPAAIIRR
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 located on page 2. If this fails to resolve the problem please contact a local heating
engineer or a qualified electrician.
Horstmann Controls Limited
Bristol
BS4 1UP
Email: [email protected].uk
Website: www.horstmann.co.uk
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to three programmed operating periods per day with Hot water
Boost and Heating Advance control on a fully pumped system.
1
12
9
11
8
10
76
54
2
13 14
15
3
16

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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 set-
tings please use the following procedure.
SETTING THE TIME OF DAY
Should you encounter any problems, please refer to the
QQuueessttiioonnaannddAAnnsswweerrsection located on page 4.
RESETTING THE PROGRAMMER
Press SELECT once.
Programme goes from
AUTO to ALLDAY
Press SELECT again.
Programme goes from
ALLDAY to 24 HRS
Press SELECT again.
Programme goes from
24 HRS to OFF
Press SELECT again.
Programme goes from
OFF to AUTO
Channel will operate
from first ON until last
OFF period
Channel will be
continuously ON
Channel will be
continuously OFF
Programmer will return
to normal ON and OFF
times
BOOST FUNCTION - 1hour temporary override
Press BOOST button:
Your Hot water will be
Boosted for 1 hour
At any time during a BOOST
period press BOOST again to
return to normal programming
ADVANCE FUNCTION - Brings forward next ON or OFF operation
Press ADVANCE button
to move to the next
Heating ON/OFF time
To cancel the advance press the ADVANCE
button again. This will return the unit to
its normal programme
INFORMATION AND ADVICE
Programming ON/OFF times
If a Heating or Hot water period is not required it can be cancelled by setting the ON and OFF
settings to the same time. Example ON 10:00am OFF 10:00am
FULLY PUMPED OR GRAVITY SYSTEM
The installer will have set the programmer to suit the installed system. If this is a Fully pumped
system this will allow independent control of the Central heating and Hot water, however on a Gravity
system the Central heating and Hot water are linked so that it is not possible to use the Central
heating independently. This will allow only one common time setting for both Hot Water and Central
Heating.
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Press the SET button until the
SET indicator is next to the
CLOCK position.
Use
PLUS and MINUS
buttons to adjust time
Press SET button
until the SET
indicator is next to
theCentral Heating
or Hot Water
position
Repeat this
process for 2nd
and 3rd settings
Press
ENTER
Press
ENTER
SETTING THE ON AND OFF TIMES
The SET indicator must remain in the RUN position for the following instructions.
The following actions work independently on either Hot Water or Central Heating.
SPECIAL FEATURES
Use PLUS and
MINUS
buttons to adjust
the 1st ON time.
Use the PLUS
and MINUS but-
tons to adjust the
1st OFF time.
Press the SET button until
the SET indicator is next to the
RUN position.
Press
ENTER
Press SET button
until the SET
indicator is returned
to RUN position
6:35
SET
CH
AUTO
ALL DAY
24 HRS
OFF
AUTO
ALL DAY
24 HRS
OFF
AUTO
ALL DAY
24 HRS
OFF
AUTO
ALL DAY
24 HRS
OFF
HW CH HW CH HW CH HW CH
PM
12:00
PM
RUN
CLOCK
HW PROG
CH PROG
6:30
AM
RUN
CLOCK
HW PROG
CH PROG
RUN
CLOCK
HW PROG
CH PROG
1ON
6:35
PM 6:35
PM 6:35
PM 6:35
PM
AUTO
ALL DAY
24 HRS
OFF
6:35
PM
RUN
CLOCK
HW PROG
CH PROG BOOST
AUTO
ALL DAY
24 HRS
OFF
6:35
PM
RUN
CLOCK
HW PROG
CH PROG ADVANCE
HW CH
HW CH
Press the SET and CH buttons together
then release the buttons and the programmer
will return to preset factory settings.
1st ON 1st OFF 2nd ON 2nd OFF 3rd ON 3rd OFF
6:30 AAMM8:30 AAMM12:00 PPMM12:00 PPMM4:30 PPMM10:30 PPMM
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The default factory settings are shown above, however if you wish to change these proceed as
instructed below.