Horstmann HRT4-B Mode d'emploi

The HRT4-B is a battery powered electronic room thermostat designed to provide

optimum comfort with close control of the energy used to heat the home.

The HRT4-B will only operate when 2 x AAA batteries have been fitted and the

thermostat is wired into your central heating system.

INSTALLATION AND CONNECTION OF THE HRT4-B MUST BE CARRIED OUT BY A

SUITABLY QUALIFIED PERSON.

WARNING: ISOLATE MAINS SUPPLY BEFORE COMMENCING INSTALLATION.

Battery Operated Electronic Room Thermostat

with TPI temperature control software

HRT4-B

User and Installation Instructions

A room thermostat simply switches the heating system on and off as necessary. It works by sensing

the air temperature, switching on the heating when the air temperature falls below the thermostat

setting, and switching it off once this set temperature has been reached.

Turning a room thermostat to a higher setting will not make the room heat up any faster.

How quickly the room heats up depends on the design of the heating system, for

example, the size of boiler and radiators.

Neither does the setting affect how quickly the room cools down. Turning a room

thermostat to a lower setting will result in the room being controlled at a lower

temperature, and saves energy.

The heating system will not work if a time switch or programmer has switched it off.

The way to set and use your room thermostat is to find the lowest temperature setting that you are

comfortable with, and then leave it alone to do its job. The best way to do this is to set the room

thermostat to a low temperature - say 18°C - and then turn it up by one degree each day until

you are comfortable with the temperature. You won’t have to adjust the thermostat further. Any

adjustment above this setting will waste energy and cost you more money.

If your heating system is a boiler with radiators, there will usually be only one room

thermostat to control the whole house. But you can have different temperatures in

individual rooms by installing thermostatic radiator valves (TRVs) on individual radiators.

If you don’t have TRVs, you should choose a temperature that is reasonable for the whole house. If

you do have TRVs, you can choose a slightly higher setting to make sure that even the coldest room

is comfortable, then prevent any overheating in other rooms by adjusting the TRVs.

Room thermostats need a free flow of air to sense the temperature, so they must not be

covered by curtains or blocked by furniture. Nearby electric fires, televisions, wall or table lamps

may prevent the thermostat from working properly.

What is a room thermostat? ... an explanation for householders

For the user

Additional User information

The Horstmann HRT4-B thermostat uses the latest control technology to provide extremely

accurate temperature control which will help to keep your energy usage as low as possible

without affecting your comfort levels. In fact comfort levels may well be improved as the control

accuracy should ensure that the room does not ‘overheat’ before switching off.

Battery replacement

The HRT4-B runs on 2 x type AAA (Alkaline) non rechargeable batteries and is designed to give a

battery life of approximately two years.

When the batteries are nearing the end of their life a low

battery symbol will appear in the display and the batteries

should be changed within a few days. If the batteries are

not changed at this point eventually a ‘LO’ battery message

flashes intermittently in the display and if this happens the

batteries should be changed immediately.

To change the batteries it is necessary to remove the

thermostat from the wall.

To do this first undo the two captive screws at the base of the

thermostat and swing the thermostat up and away from the wall

plate.

N.B. The wall plate must not be altered or modified as it has

been specially designed to isolate the mains supply when the

thermostat is removed to change the batteries.

Remove the old batteries and replace them with two new AAA size

alkaline batteries ensuring that they are fitted correctly as indicated

by the terminal markings in the battery compartments.

Please dispose of the batteries responsibly.

Once the batteries are fitted, re-fit the thermostat to the wall plate by engaging with the lugs at the

top of the wall plate and push the thermostat into position. Locate it over the captive screws at the

base of the wall plate and tighten so that the thermostat is locked into position.

Check the temperature setting is correct and adjust if necessary.

The display will show the

required temperature setting

and can be adjusted in

increments of 1°C.

To adjust the required

temperature setting turn the

dial anti clockwise to decrease

it and clockwise to increase it.

When the

thermostat is in

the ‘call for heat’

condition a flame symbol

will appear in the display.

Pressing the temperature

setting dial will allow the user

to check the current room

temperature which will be

displayed for approx 7 seconds

before returning to the set

temperature.

User Instructions

Further information on how the thermostat operates is contained

in the ‘Explanation for householders’ that precedes this section.

Low battery symbol

appears rst when the

batteries are nearing

the end of their life

Batteries should be

changed immediately

Warning isolate mains supply before commencing

installation.

Positioning the Room Thermostat

The HRT4-B 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 easy access to the

two retaining screws located at the base of the wall plate.

Fitting the wall plate

To remove the wall plate from the HRT4-B 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 HRT4-B is re-sealed to prevent damage from dust,

debris etc.

The wall plate should be fitted with the wiring terminals located at the

top and in a position which allows a total clearance of at least 50mm

around the HRT4-B thermostat.

Direct Wall Mounting

Offer the plate to the wall in the position the HRT4-B 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 will compensate for any misalignment of the fixings.

Wiring Box Mounting

The HRT4-B wall plate may be fitted directly on to a single gang steel flush wiring box complying

with BS4662, using two M3.5 screws. The HRT4-B 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. For mains voltage applications a 3 Amp fused spur should be

used. The recommended cable size is 1.0mm2.

The wall plate is provided with a terminal guard to protect the

user when replacing the batteries. This is supplied with the

wall plate and it is essential that the terminal guard is fitted

after completing the electrical connections to the terminals of

the wall plate.

FAILURE TO DO THIS COULD RESULT IN ELECTRIC SHOCK WHEN CHANGING BATTERIES.

As access to the terminals will not be possible once the terminal guard is fitted only fit the guard

when all wiring is complete and the system checked for correct operation.

Installation Instructions

HRT4-B thermostat – internal wiring diagram

• The HRT4-B has voltage free contacts.

• The HRT4-B is battery powered, therefore no

mains connection is required to power it.

Please ensure that all wiring complies with

the current IEE regulations.

The HRT4-B 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.

HRT4-B terminal connections

Typical combination boiler installation with

ChannelPlus H11XL time switch and HRT4-B room thermostat

Typical combination boiler installation for boiler

with built in timer and external room ‘stat





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

MAINS

SUPPLY



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

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





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HRT4-B















MAINS

SUPPLY





These diagrams are schematic and should be used for guidance only.

HRT4-B

COMMON

   

CALL FOR

HEAT



















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

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

HRT4-B

ROOM

STAT

HRT4-B

ROOM

STAT

















MAINS

SUPPLY

MAINS

SUPPLY

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



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



Fully Pumped Heating System using HRT4-B room stat, cylinder stat and Three Port Mid

Position Valve with a Horstmann ChannelPlus H21/H27 electronic programmer.

Fully Pumped Heating System using HRT4-B room stat, cylinder stat and Two (2 Port) Spring

Return Valves with auxiliary switches and a Horstmann ChannelPlus H21/H27 electronic

programmer.

INSTALLATION AND CONNECTION OF THE HRT4-B MUST BE CARRIED OUT BY A SUITABLY QUALIFIED

PERSON. WARNING: ISOLATE MAINS SUPPLY BEFORE COMMENCING INSTALLATION.

These diagrams are schematic and should be used for guidance only.

Fitting the thermostat to the wall plate

Ensure the terminal guard is fitted into place

over the terminals of the wall plate. Fit the two

AAA batteries provided, ensuring they are installed

correctly as indicated by the terminal markings in

the battery compartment. Ensure that the electricity

supply to the HRT4-B is switched OFF.

Swing the thermostat into position on the wall plate

without fitting the battery terminal guard. Tighten the

2 captive screws on the underside of the unit.

Now switch ON the electrical circuit to the HRT4-B

and observe that it switches the heating system On

and Off as the temperature is turned up and down

on the thermostat. If the thermostat is switching

the heating system satisfactorily then switch the

electricity supply to the thermostat OFF, remove the

thermostat from the wall plate and fit the terminal

guard over the terminals on the wall plate.

Once clipped into position the terminal guard cannot be removed from the wall plate.

Re-fit the thermostat into position on the wall plate and tighten the 2 captive screws on the

underside of the unit. Switch on the electricity supply to the HRT4-B and check again for correct

operation.

Explain its operation to the householder before handing over these instructions, highlighting the

‘explanation for householders’ section on page 2.

Wiring conversion charts

Replacing existing Horstmann thermostats

Replacing other thermostats

HRT4-B DRT1

Common 1 Common

Call (N/O) 4 N/O

Satisfied (N/C) 3 N/C

HRT4-B Drayton Danfoss Honeywell

Digistat + RETB DT90E

Common 1 Com 3 A

Call (N/O) 4 On 2 B

Satisfied(N/C) 3 Off 1 C

Thermostat specifications HRT4-B

Power Supply 2 x AAA alkaline batteries

Contact rating 3 (1)amp at 230v AC

Temperature accuracy +/- 0.5°C

Contact type Micro disconnection

Volt free changeover

Dimensions 86mm x 86mm x 36.25mm

Pollution control Degree2

Design standard EN60730 – 2-9

Temperature range HRT4-B 5-30°C

Rated Impulse voltage Cat 1 - 1500v

Enclosure protection IP30

DIL switch settings – 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.

• DIL switch numbers 7 and 8 should be set as diagram opposite.

• For Gas boilers set the TPI setting to 6 cycles per hour.

(Default setting)

• For Oil boilers set the TPI setting to 3 cycles per hour.

• For Electric heating set the TPI setting to 12 cycles per hour.

Horstmann Controls

South Bristol Business Park, Roman Farm Road, Bristol BS4 1UP

E-mail: [email protected]o.uk

Web site: www.horstmann.co.uk

Leaflet number P83851 – Issue 1

Switch positions for

different TPI settings.

Table des matières

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