Secure HRT4-B Betriebsanleitung

User and Installation Instructions

HRT4-B

Battery Operated Electronic Room

Thermostat with Load Compensation (LC)

Temperature Control Software

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.

WARNING: ISOLATE MAINS SUPPLY BEFORE

COMMENCING INSTALLATION.

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.

The heating system will not work if a time switch or

programmer has switched it off.

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.

FOR THE USER

What is a room thermostat? ... an explanation

for householders

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. 5

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.

The 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.

ADDITIONAL USER INFORMATION

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.

USER INSTRUCTIONS

When the thermostat is in the ‘call for heat’ condition a

flame symbol will appear in the display. Further

information on how the thermostat operates is

contained in the ‘Explanation for householders’ that

precedes this section.

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. 7

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.

Battery Replacement

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.

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.

INSTALLATION INSTRUCTIONS

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.

Positioning the Room

Thermostat

Warning isolate mains

supply before

commencing

installation.

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.

Please dispose of old 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.

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.

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