Horstmann C-Stat 11-B Bedienungsanleitung

C-Stat 11-B | C-Stat 17-B

Installation Instructions

Battery Powered 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 battery powered, these models are suitable for

replacing most existing room thermostats.

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.

Positioning the C-Stat programmable room

thermostat

The C-Stat should 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

1.5m

Fitting the wall plate

To remove the wall plate from the C-Stat undo the two retaining

screws located on the underside, the wall plate should now be

easily removed. Once the wall plate has been removed from the

packaging please ensure the C-Stat is resealed to prevent

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 wall plate with compensate for any

misalignment of the fixings.

TOP

1 2 3 4 L N

1 2 3 4 LN

TOP

Wiring Box Mounting

The C-Stat wall plate may be fitted directly on to a single gang

steel flush wiring box complying with BS4662, using two M3.5

screws. The C-stat is suitable for mounting on a flat surface only;

it must not be positioned on an unearthed metal surface.

Electrical Connections

All necessary electrical connections should now be made. Flush

wiring can enter from the rear through the aperture in the wall

plate. The recommended cable size is 1.0mm².

Internal wiring diagram

The C-Stat is double insulated and does not require an earth

connection, an earth connection block is provided on the wall

plate for terminating any cable earth conductors. Earth

continuity must be maintained and all bare earth conductors

must be sleeved. Ensure that no conductors are left protruding

outside the central space enclosed by the wall plate.

ŸThe C-Stat has voltage free contacts

ŸThe C-Stat is battery powered, therefore no mains connection

is required to power it.

Please ensure that all wiring complies with current IEE

regulations

COMMON

CALL FOR

HEAT

C-STAT

1 2 3 4

1 2 34

ENL

Remove link

if Fitted

COMBINATION BOILER

TERMINALS

Mains

Supply

C-Stat

C-Stat controlling typical combination boiler installation.

For precise termination connection information please refer to the boiler manufactures

instructions

N L ON OFF ON OFF

HOT

WATER

CENTRAL

HEATING

PUMP

BOILER

Programmer

C-Stat

MAINS

SUPPLY

MAINS

SUPPLY

ROOM

STAT

SAT

CALL

SAT

CALL

CYL

STAT

C CN 1 2 3 4

C-Stat controlling a secondary heating zone on a fully pumped system with existing

programmer and two spring return valves with auxiliary switches

N L ON OFF ON OFF

HOT

WATER

CENTRAL

HEATING

PUMP

BOILER

Programmer

C-Stat

MAINS

SUPPLY

CALLSAT

CALL

CYL

STAT

SAT

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.

N L ON OFF ON OFF

HOT

WATER

CENTRAL

HEATING

Programmer

C-Stat

MAINS

SUPPLY

CALLSAT

CALL

CYL

STAT

SAT

PUMP

BOILER

All wiring diagrams are schematic and should be used for guidance only.

INSTALLATION AND CONNECTION OF THE C-STAT MUST BE CARRIED OUT BY A

SUITABLY QUALIFIED PERSON.

WARNING: ISOLATE MAINS SUPPLY BEFORE COMMENCING INSTALLATION

TPI Temperature control software

Thermostats using TPI (Time Proportional Integral) control

algorithms will reduce the temperature swing that normally

occurs when using traditional bellows or thermally 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 set the TPI setting to 6 cycles per hour (default

setting)

ŸFor Oil boilers set the TPI setting to 3 cycles per hour

ŸFor Electric heating set the TPI setting to 12 cycles per hour

To adjust this setting go to the SET UP MENU and select TPI

CYCLES

Fitting the C-Stat to the wall plate

Fit the 2 x AA batteries provided under the hinged battery cover

on the front of the unit. Ensure they are fitted correctly as

indicated by the terminal markings in the battery compartment.

Complete the installation by swinging the C-Stat into position by

engaging the lugs at the 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.

Installer Settings

There are a number of 'Installer Settings' that should be set on

installation.

These can be found under the 'SET UP MENU' on page 15 of

the user instructions.

The TPI Cycles setting and Optimum Start settings should be

carefully set on installation as this will affect system performance.

Clock Format AM/PM or 24 Hour clock display - Default

setting AM/PM

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 should be 3

cycles per hour

For Electric panel heaters this should be 12

cycles per hour

Optimum Start On or Off – Default setting Off

Resetting 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

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