HRT4-A, HFT4 and HTT4
User and Installation Instructions
Mains Operated Electronic Room Thermostat with
Load Compensation temperature control software
The HRT4-A is a 230 volt electronic room thermostat
designed to provide optimum comfort with close control of
the energy used to heat the home. These instructions also
apply to the HFT4 frost thermostat and the HTT4 tamper
proof thermostat.
INSTALLATION AND CONNECTION OF THE HRT4-A,
HFT4 AND HTT4 MUST BE CARRIED OUT BY A
SUITABLY QUALIFIED PERSON.
WARNING: ISOLATE MAINS SUPPLY BEFORE
COMMENCING INSTALLATION.
The HRT4-A will only operate on a 230 Volt mains
electricity supply and until power is connected the
thermostat will be inoperative.
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What is a room thermostat? ... an explanation for
householders
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.
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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.
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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 them.
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.
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Additional User information
Set the dial to the required room temperature by lining up
the temperature marked on the dial in degrees C against
the setting mark to the left of the dial.
The indicator light will be On when the thermostat is 'calling'
for heat. (In other words the thermostat has detected that
the room is not warm enough compared to its set
temperature).
If the indicator light is Off then either the room thermostat is
sensing that it is warm enough and has switched Off or that
the timeswitch / programmer has switched Off.
N.B. If the timeswitch or programmer has switched Off the
thermostat will not operate.
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