CentaurPlus C21 & C27 Series 2
Installation Instructions
CentaurPlus C21 and C27 two channel programmers offer up to
three on/off periods a day for hot water and heating with a hot
water boost and heating advance facility.
Installation and connection should only be carried out by a
suitably qualified person and in accordance with the current
edition of the lET wiring regulations.
WARNING: Isolate mains supply before commencing
installation.
1
Fitting the backplate
Once the backplate has
been removed from the
pa ck agin g pl ea se
ensure the programmer
is resealed to prevent
damage from dust and
debris.
The backplate should
be fitted with the wiring
terminals located at the top and In a position that allows a total
clearance at last 50mm around the unit.
50mm
50mm
1 2 3 4
N L
50mm
100mm
Direct Wall mounting
Offer the backplate to the wall in the position where the
programmer is to be mounted, remembering that the backplate
fits to the left hand end of the control. Mark the fixing positions
through the slots on the backplate (fixing centres of 60.3mm), drill
and plug the wall, then secure the backplate position. The slots in
the backplate will compensate for any misalignments of the
fixing.
Wiring box mounting
The backplate may be fitted directly onto a single gang steel flush
wiring box complying with BS4662 using two M3.5 screws.
CentaurPlus controls are suitable for mounting on a flat surface
only, they must not be positioned on a surface mounted wall box
or on unearthed metal surfaces.
2
Electrical Connections
All necessary electrical connections should now be made. Flush
wiring can enter from the rear through the aperture in the
backplate. Surface wiring can only enter from beneath the
programmer and must be securely clamped. The mains supply
terminals are intended to be connected to the supply by means of
fixed wiring. Recommended cable sizes are 1.00 or 1.5 mm2.
CentaurPlus programmers are double insulated and do not
require an earth connection but an earth connection is provided
on the backplate for terminating cable earth connectors. Earth
continuity must be maintained and all bare earth connectors must
be sleeved. Ensure no earth conductors are left protruding
outside the central space enclosed by the backplate.
Internal wiring diagram - C21 & C27 Series 2
L
N
230V 50Hz
3
1 2
HW
CH
OFF OFF ON ON
4
CHHW
New Installations
Example circuit diagrams for some typical installations are
shown in the pages which follow. These diagrams are schematic
and should be used as a guide only.
Please ensure that all installations comply with current IET
regulations.
3
For reasons of space and clarity not every system has been
included and the diagrams have been simplified - for example
some Earth connections have been omitted.
Other control components shown in the diagrams, i.e valves,
Room stats etc are general representations only. However the
wiring detail can be applied to the corresponding models of most
manufacturers for example Honeywell, Danfoss Randall, ACL
Drayton etc.
Cylinder and Room Thermostat key;
C= Common; CALL = Call for heat or break on rise; SAT =
satisfied on rise; N = neutral.
L
N
E
MAINS
SUPPLY
N
L
L
N
BOILER
1.Gravity Hot water with pumped heating
1 2
3
N
PUMP
4
L
4
1 2
3
4
MAINS
SUPPLY
L
N
E
N
L
N
BOILER
CALL
L
C CN
CYL
STAT
SAT
N
PUMP
ROOM
STAT
SATCALL
L
2. Gravity Hot water with pumped heating via room stat and cylinder stat
L
N
1 234
E
MAINS
SUPPLY
N
L
CALL
L
N
BOILER
3. Gravity Hot water with pumped heating via Room Stat and Cylinder Stat including
Frost protection via double pole FrostStat
CN
ROOM
STAT
CALL
C
CYL
STAT
SAT
L
N
PUMP
C
FROST
SAT
STAT
CALL
CALL
5
1 2
C CN
CYL
STAT
SAT
CALL
3
4
ROOM
STAT
SAT
MAINS
SUPPLY
E
N
L
BR
BL
L
N
CALL
W
GR
0
ZONE VALVE
4. Gravity Hot water with pumped heating via room stat, cylinder stat and two port zone
valve( with changeover auxiliary switch) on hot water circuit.
E
MAINS
N
SUPPLY
L
W
BL
0
GR
5. Fully pumped heating system using Room stat, Cylinder stat and three port mid
position valve.
N
CYL
STAT
CALL
L
BOILER
L
1 234
C
SAT
CALL
N
L
PUMP
&
BOILER
L
N
PUMP
C
FROST
STAT
CALL
N
CN
ROOM
STAT
SATCALL
6
L
N
1 234
E
MAINS
N
SUPPLY
L
N
PUMP
BOILER
6. Fully pumped system using room stat and two(2 Port) spring return zone valves with
auxiliary switches.
E
MAINS
N
SUPPLY
L
7. Fully pumped system using room stat and two(2 Port) motorized valves with auxiliary
switches.
C
CYL
STAT
CALL
L
&
L
N
CALL
N
L
PUMP
&
BOILER
CN
ROOM
STAT
SAT
ZONE
VALVE
1 234
C
CYL
STAT
SAT
ZONE
VALVE
C
FROST
CN
ZONE
VALVE
SATCALL
CALL
ROOM
STAT
ZONE
VALVE
STAT
IF
FITTED
SATCALL
7
Commissioning the programmer
Ensure all dust and debris has been cleared away from the work
area before removing the programmer from its packaging.
All CentaurPlus programmers are suitable for GRAVITY HOT
WATER and FULLY PUMPED systems.
On a FULLY PUMPED or CONTROLLED system it is possible to
programme independent time settings for hot water and heating.
On GRAVITY or PARTIALLY CONTROLLED systems the hot
water and heating allow a common time setting. It is not usually
possible to have heating without hot water. Correct control of
each type of system is ensured by a CIRCUIT LINK located on
the rear of the programmer.
If the programmer is to control a GRAVITY HOT WATER system
this link should be removed by simply pulling it out of the back of
the programmer. When used to control a fully pumped system the
link must remain in situ.
Rear view of programmer
1. RATINGS LABEL
2. BATTERY
3
1
PULL TO REMOVE
+
4
2
5
3. CONNECTOR PINS
4. PRODUCTION DATE LABEL
5. CIRCUIT LINK
8
Battery Reserve
The battery must be commissioned prior to fitting the control to
the backplate. This is achieved by the means of a commissioning
strip situated in the back of the unit. Pull out the battery
commissioning strip at the back of the programmer control and
re-insert the battery; the reserve is now activated. When the
programmer is running the battery reserve clock display will
disappear. This is to prolong the life of the battery.
Fitting the programmer
If surface wiring has been used, remove the
knockout/insert from the bottom of the
programmer to accommodate it.
Loosen the two 'captive' retaining screws on
the bottom of the backplate. Now fit the
programmer to the backplate, ensuring the
lugs on the backplate engage with the
control.
Swing the bottom of the control into
position ensuring that the connection
pins on the back of the unit locate into the
terminal slots in the backplate. Tighten
the two captive retaining screws to fix the unit securely. Then
switch on the mains supply.
On completion of the installation please reset the programmerdetailed on page 10.
End view of programmer
9
Resetting the programmer
On the CentaurPlus press the SET and SELECT buttons together.
Then release the buttons and the programmer will return to preset
factory settings.
The preset factory settings are illustrated on page 7 of the USER
GUIDE.
SELECT
SET
The unit can now be programmed to suit the user's requirements.
Please refer to the User Guide provided.
General information
Before handing over the installation to the user, always ensure
that the system responds correctly on all control programmes
and that other electrically operated equipment and controls are
correctly adjusted.
Explain how to operate the controls and hand over the users
operating instructions to the user.
10
Specification - CentaurPlus C21 & C27
Contact rating 3 (1) Amps 230V AV
Contact type Micro- disconnection
Supply 230V AC 50Hz only
Pollution Degree 2
Class A software Type 1 control
Operating temprature range 0 °C to +40 °C
Battery life 10 months continuous
operation(minimum)
Case material Thermoplastic, flame
retardant
Dimensions 84mm x 150mm x 29mm
Clock 12 hour AM/PM
Auto BST/GMT changeover
Display Back lit liquid crystal
Displayed time adjustments 1 minute steps
Switched time adjustments 10 minute steps
Operating periods per day 3 per day for CH and 3 per day
for HW
Override 1 hour boost (HW only),
1 hour extension to on period
(HW only),
Instant advance (CH only)
Mounting Industry standard 6 terminal
plug in wall plate
Standard(s) EN 60730-1, EN 60730-2-7
BS EN 60730-1,
BS EN 60730-2-7
11
NP0 08 43 70 00 0
Secure Meters (UK) Ltd
Secure House, Lulworth Close,
Chandler's Ford,
Eastleigh, SO53 3TL, UK
t: +44 1962 840048 f: +44 1962 841046
www.securemeters.com
Part Number P84370 Issue 7
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