1. Introduction
TRT products are a cost effective
comprehensive range of thermostats
and timers designed for internal use only.
The TRT033 is a battery powered
electronic room thermostat, with night
set back and frost mode. It has optional
PID control (which can help to minimise
temperature overshoot), and adjustable
swing (difference between on and off
switching temperatures), from 1ºC
to 0.5ºC.
It is designed to be surface mounted
on the wall plate supplied.
The electrical supply must be isolated
before removing the thermostat from the
wall plate.
2. Siting
The TRT033 must be sited where it will not be
influenced by heat sources, for example above a
radiator or a television or a refrigerator/freezer,
or in direct sunlight or subjected to draughts.
The product requires air circulation, so do not
position above or below shelving or other wall
mounted obstacles.
It should be mounted approximately 1.5m
above floor level.
3. Installation
This product must be installed in accordance
with the appropriate building and wiring
regulations.
In all cases if there is a doubt as to how to
proceed with an installation consult a qualified
electrician, your local authority’s building
control department or the Timeguard helpline
(020 8450 0515).
The TRT033 is designed to be surface mounted
on the supplied wall plate.
Always isolate the mains supply before
removing the unit from its wall plate.
Room temperature
display (control
temperature displayed
flashing during setting)
Border illuminates
when finding out
or changing set
temperature
Shows
when heat
is demanded
Flashing symbol,
battery change
required
Button illuminates
during changes to
set back and frost
settings
Button to
find out or
change set
temperature
Fig. 1
TRT033 Electronic Room Thermostat
Contents
TRT033 thermostat
TRT033 wall plate
TRT033 instruction leaflet
2 x wall plugs
2 x screws
2 x AA batteries
Alternative
fixing holes
Retaining
tab
Terminal for maintaining
continuity of earth
Switched
live terminal
(SL)
Live
terminal
(L)
Fig. 3
Back Plate Removed
PID
ON OFF
SWING
1.0 0.5
Jumper shown
in PID off
position
Wall plate retaining screws
(at bottom of TRT033)
Jumper shown
in Swing 1.0ºC
position
Fig. 2
Rear View of TRT033
Battery holder
(2 x AA batteries)
Screen illuminates
during setting of
operating parameters
Thumbnail cut out to assist
battery holder removal
Frost/bed
button
Reset
button
Fig. 1a
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 18ºC – 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
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