CentaurPlus C21 Series 2
User Operating Instructions
Two Channel Central Heating and Hot Water Programmer
The Horstmann CentaurPlus C21 two channel programmer
gives independent control over hot water and heating
with up to 3 ON/OFF settings per 24 hours.
It also has a 1 hour manual boost button for the hot water and
an advance button for the central heating.
There is also a programming switch allowing permanent selection of:
OFF/ON/AUTO/ALL DAY.
1
The CentaurPlus C21 Programmer
The simple instructions contained in this user guide are designed to help with the
programming and operation of the unit.
11
1 15
3
9
4 5 6 7 8
1 SET indicator - RUN is the normal position
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) programme select button or ENTER button
8 Central Heating (CH) programme 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
2 16
12
13
14
10
2
Fully Pumped or Gravity System
The installer will have set the programmer to suit the installed system. This is normally a
Fully Pumped system which will allow independent control of the central heating and hot
water, however on an old 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, and will become apparent
when setting the ON and OFF times as both will be indicated together.
Manual Overrides
BOOST FUNCTION - 1 HOUR TEMPORARY OVERRIDE (HOT WATER ONLY)
The boost facility will allow the user to boost the hot water channel 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 hot water channel ON indicator will also be
illuminated.
HW CH
AUTO
ALL DAY
24 HRS
OFF
Press BOOST
button once
for 1 hour of
hot water
At any time
during a BOOST
period press
BOOST again to
return to normal
programming
RUN
CLOCK
HW PROG
CH PROG
PM
6:35
BOOST
ADVANCE FUNCTION – BRINGS FORWARD THE NEXT ON OR OFF OPERATION
(CENTRAL HEATING ONLY)
The advance facility will allow the user to switch the central heating channel ‘ON’ which
is currently ‘OFF’ or switch the central heating channel ‘OFF’ which is currently ‘ON’. To
indicate the advance feature being activated ADVANCE will be shown on the display
until the next programme switching time. The central heating ON indicator will also be
illuminated.
Press ADVANCE
button once to
move to the
next ON/OFF
time
To cancel the
advance press the
ADVANCE button
again. This will
return the unit
to its normal
programme
RUN
CLOCK
HW PROG
CH PROG
PM
6:35
ADVANCE
HW CH
AUTO
ALL DAY
24 HRS
OFF
3
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