Horstmann C27 User Manual

1.SET indicator 10.Central heating ON indicator
2.Time of day 11.SET positions
3.Switch Period symbol 12.PROGRAMME positions
4.SET Button 13.BOOST symbol
5.Hot water BOOST or adjust (-) button 14.ADVANCE symbol
6.Central heating ADVANCE or adjust (+) button 15.AM/PM symbol
7.Hot water (HW) select or ENTER Button 16.Day of week indicator
8.Central heating (CH) select or COPY button 17.PROGRAMME indicators
9.Hot water ON indicator
CCEENNTTAAUURRPPLLUUSS CC2277
UUSSEERR IINNSSTTRRUUCCTTIIOONNSS
QQUUEESSTTIIOONNSS AANNDD AANNSSWWEERRSS
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 P60498
ISSUE 4
FRONT VIEW OF PROGRAMMER
PPaaggee 11
PPaaggee 44
TThhee ffoolllloowwiinngg aarree ssoommee ooff tthhee eeaassyy ttoo ooppeerraattee ffeeaattuurreess::--
FFlleexxiibbllee 77 DDaayy CCoonnttrrooll
11 HHoouurr BBoooosstt oonn HHoott WWaatteerr
IInnddeeppeennddeenntt ttiimmiinngg oonn HHoott WWaatteerr aanndd HHeeaattiinngg
CCeennttrraall HHeeaattiinngg AAddvvaannccee ggiivveess iinnssttaanntt OOnn//OOffff oovveerrrriiddee
UUpp ttoo 33 OOnn//OOffff ppeerriiooddss ppeerr cchhaannnneell iinn eeaacchh 2244HHrr ooppeerraattiioonn..
PPrrooggrraammmmee ooppttiioonnss:: AAuuttoo // AAllll ddaayy // 2244 HHoouurrss // OOffff
SSEERRVVIICCEE AANNDD RREEPPAAIIRR
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.
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.
HHoorrssttmmaannnn’’ss CC2277 -- TTwwoo CChhaannnneell PPrrooggrraammmmeerr
Offers up to three
programmed operating periods per day, seven days a week,
with Hot water Boost and Heating Advance control on a fully
pumped system.
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12
9
11
8
10
76
54
2
13
14
15
3
16
17
Horstmann Controls Limited
Bristol
BS4 1UP
Email: sales@horstmann.co.uk
Website: www.horstmann.co.uk

Horstmann C27 Specifications

General

Brand	Horstmann
Model	C27
Category	Motherboard
Language	English

Summary

Battery Information

Service and Repair Guidance

User Serviceability

States the programmer is not user serviceable and advises against dismantling.

Fault Resolution

Advises referring to the RESETTING THE PROGRAMMER section for faults.

Troubleshooting Common Issues

Display Frozen Issue

Addresses frozen display, suggests local interference and RESET procedure.

Indicator Neon Failure

Discusses neon light failure, suggesting RESET or programmer replacement.

Pump or Boiler Operation Failure

Explains neon light illumination but no pump/boiler operation, pointing to system issues.

No Display on Programmer

Covers no display on the programmer, advising RESET or mains supply check.

Warranty Status Check

Explains how to check the programmer's warranty status via date on the unit.

Programmer Removal

Details safe removal of the programmer from its backplate by qualified personnel.

Horstmann C27 Programmer Features

Key Operating Features

Lists features like 7-day control, boost, advance, and multiple daily periods.

Programmable Modes

Describes available programme modes: Auto, All day, 24 Hours, Off.

Programmer Front View

Controls and Indicators

Identifies key buttons like SET, PLUS, MINUS, ENTER, COPY, and indicators for HW/CH.

Display Elements

Describes display elements like clock, day of week, AM/PM, and programme indicators.

Resetting and Programming Basics

Resetting the Programmer

Details the procedure to reset the programmer to factory settings.

Setting ON/OFF Times

Explains how to set ON/OFF times and cancel periods by setting same times.

System Type Impact

Details how system type (pumped/gravity) affects independent control of HW and CH.

Setting Day and Time

Setting Day and Time of Day

Provides step-by-step instructions for setting the current day and time.

Programming Functions

Default Time Settings

Shows the default programmed ON/OFF times for weekdays and weekends.

Setting ON/OFF Times Procedure

Details the process for setting the ON and OFF times for heating and hot water.

Programme Selection Options

Explains how to cycle through AUTO, ALL DAY, 24 HRS, and OFF modes.

Hot Water Boost Function

Describes how to activate a temporary 1-hour boost for Hot Water.

Heating Advance Function

Explains how to bring forward the next heating ON or OFF time.