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C-Stat 11-M | C-Stat 17-M

Installation Instructions

Mains Operated Programmable Room Thermostat

Programmable room thermostats are widely recognised as one 
of the best ways in which to control central heating. Horstmann 
C-Stat  programmable  room  thermostats  have  a  large  display 
and intuitive user interface, making them easy to set up and use. 
C-Stat  uses  a  sophisticated  time  proportional  integral  (TPI) 
algorithm  for  accurate  temperature  control  and  energy 
efficiency. Being mains powered these models won't need the 
batteries changing every two years.

Installation  and  connection  should  only  be  carried  out  by  a 
suitable qualified person and in accordance with the edition of 
the IEE wiring regulation.

Warning: Isolate mains supply before commencing installation

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Summary of Contents for C-Stat 11-M

Page 1: ... intuitive user interface making them easy to set up and use C Stat uses a sophisticated time proportional integral TPI algorithm for accurate temperature control and energy efficiency Being mains powered these models won t need the batteries changing every two years Installation and connection should only be carried out by a suitable qualified person and in accordance with the edition of the IEE ...

Page 2: ...be mounted on an internal wall approximately 1 5 metres from floor level and should be in a position away from draughts direct heat and sunlight Ensure that there will be enough space to allow access to the two retaining screws located at the base of the wall plate 2 1 5m ...

Page 3: ...nt damage from dust debris etc The wall plate should be fitted in a position which allows a total clearance of at least 50mm around the C Stat programmable thermostat Direct Wall Mounting Offer the plate to the wall in the position the C Stat is to be mounted and mark the fixing positions through the slots in the wall plate Drill and plug the wall then secure the plate in position The slots in the...

Page 4: ... plate A Pattress is supplied to allow mains surface wiring to enter the unit The mains supply terminals are intended to be connected to the supply by means of fixed wiring The C Stat is mains powered and requires a 3 Amp fused spur The recommended cable size is 1 0mm The C Stat is double insulated and does not require an earth connection an earth connection block is provided on the backplate for ...

Page 5: ... ensure that all wiring complies with current IEE regulations ŸThe C Stat have voltage free contacts ŸFor mains voltage switching applications link terminal L 1 ŸFor low voltage switching applications apply low voltage to terminal 1 with no links 5 CALL 1 2 3 4 L N 230V MAINS SUPPLY CALL FOR HEAT ...

Page 6: ...L Mains Supply COOLING LOAD C Stat C Stat conjunction with a contactor wired to control a cooling load When necessary the should be used in N L ON OFF ON OFF HOT WATER CENTRAL HEATING PUMP BOILER Programmer MAINS SUPPLY MAINS SUPPLY N L E N L E N L ROOM STAT ROOM STAT SAT CALL SAT CALL CYL STAT C C N C Stat programmer and two spring return valves with auxiliary switches controlling a secondary hea...

Page 7: ...Stat MAINS SUPPLY N L E CALL SAT CALL CYL STAT C SAT 1 3 4 PUMP BOILER N L C Stat replacing a conventional room thermostat on a fully pumped system with an existing programmer and two spring return valves with auxiliary switches C Stat replacing a conventional room thermostat on a fully pumped system with an existing programmer and 3 port mid position valve L N 230V MAINS SUPPLY L N 230V MAINS SUP...

Page 8: ...ly operated thermostats As a consequence a TPI regulating thermostat will maintain the comfort level far more efficiently than any traditional thermostat When used with a condensing boiler the TPI thermostat will help to save energy as the control algorithm allows the boiler to operate in condensing mode more consistently compared to older types of thermostat ŸFor Gas boilers ser the TPI setting t...

Page 9: ... top of the wall plate before pushing it firmly home into its plug in terminal block Tighten the 2 captive screws on the underside of the unit Now ensure that the heating system is responding to the On Off commands from the C Stat Explain its operation to the householder and hand over the users operating instructions to the user ...

Page 10: ...lock display Default setting Daylight saving On or Off Default setting ON for UK Market Standby temperature Frost protection setting Default setting 5 C Upper and Lower Default settings 30 C and 5 C Temperature limits TPI Cycles This setting will change according to the type of boiler being used Default setting 6 For Gas boiler this setting should be 6 cycles per hour For Oil boilers this setting ...

Page 11: ... the thermostat Electronic equipment can in some circumstances be affected by electrical interference If the display becomes frozen or scrambled simply press both the BACK and ENTER button simultaneously BACK ENTER ...

Page 12: ...e free c o contacts SPDT Contact voltage rating 230V ac 50Hz 30V dc Contact current rating 8A 1Ainductive Temperature differential 0 5 C Temperature accuracy 0 5 C to 21 C Impulse rating Category II 2500 V Standards BS EN 60730 2 9 Dimensions WxHxD 120mm x 100mm x 26 5mm Weight 0 3kg approx Enclosure Flame retardant thermoplastic Ingress protection IP30 Pollution degree Degree 2 Insulation class C...

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