Timeguard TRT033C User Manual

Battery Powered

Electronic Room

Thermostat

Cat. No. TRT033C

RESET

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.

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.

1. Introduction

RESET

TRT products are a cost effective
comprehensive range of thermostats
and timers designed for internal use only.

The TRT033C 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.

TRT033C Electronic Room Thermostat

Room temperature
display (control
temperature displayed
flashing during setting)

Shows
when heat
is demanded

Border illuminates

when finding out

or changing set

temperature

Flashing symbol,

battery change

required

Button to
find out or
change set

temperature

Button illuminates

during changes to

set back and frost

settings

Screen illuminates
during setting of
operating parameters

Thumbnail cut out to assist
battery holder removal

Frost/bed

button

Reset

button

RESET

Battery holder

(2 x AA batteries)

Fig. 1

Fig. 1a

Rear View of TRT033C

Jumper shown
in PID off
position

ON OFF

Wall plate retaining screws

(at bottom of TRT033C)

2. Siting

The TRT033C must be sited where it will not be
influenced by heat sources, for example above a
radiator or a television or a refrigerator/freezer,

Jumper shown
in Swing 1.0ºC

position

Back Plate Removed

Live
terminal
(L)

Switched

live terminal

(SL)

Retaining

tab

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.

PID

SWING

1.0 0.5

3. Installation

This product should be installed by a qualified
installer to current installation standards.
If in any doubt contact the Timeguard Helpline
020 8450 0515.

Alternative
fixing holes

Fig. 3

Terminal for maintaining

continuity of earth

The TRT033C is designed to be surface mounted
on the supplied wall plate.

Always isolate the mains supply before
removing the unit from its wall plate.

Contents

Fig. 2

TRT033C thermostat
TRT033C wall plate
TRT033C instruction leaflet

2 x wall plugs
2 x screws
2 x AA batteries

To insert battery, first lower hinged front
cover and lever battery holder out using the
thumbnail cut out shown in Fig. 1a.

Insert the 2 x AA alkaline batteries supplied into
the battery holder maintaining the correct polarity
as shown in the base of the battery holder.

Insert battery holder connector blades fully into
their respective slots on the TRT033C and snap
battery holder into place.

Isolate 230VAC mains supply.

Incoming and outgoing wires should be 1.5mm sq.

Remove wall plate from unit, by undoing retaining
screws (see Fig. 2), and pivoting the bottom of the
unit outwards. The TRT033C can then be lifted off.

Pass the incoming wires through the opening
in the wall plate, and fix wall plate securely to
the wall, using screws (and wall plugs if necessary)
provided. The screws which secure the TRT033C
to the wall plate should be at the bottom.

Allow sufficient excess cable to wire up the unit,
but not too much to make it difficult to close the
unit onto the wall plate.

Connect the conductors to the relevant terminals,
according to the wiring diagram below. Ensure
that the curved brass washers grip the conductors.

Wiring Diagram

Note:
Check boiler
instructions
before
connecting

NONCCOM

4. Operation

Open battery access flap and press reset.

Normally current room temperature is
displayed on the screen.

To find out or adjust the set temperature,
press the + or - button once. The screen and
button border will illuminate blue as soon as
the button is pressed until 5 seconds after the
button is released. The set temperature will
flash to show it can be adjusted. If the set
temperature is ok do nothing and the display

Fig. 4

N

L

will return to room temperature 5 seconds later.
Otherwise use the + and - buttons to get to the
required set temperature in 0.5ºC steps. If the

This unit is double insulated, and hence does not
need connection to earth. If earth continuity is

+ or - button is held down, the display will
advance rapidly.

required, please use earth terminal on wall plate.

Once the desired temperature is set,

To reinstall the unit on the wall plate first ensure
the wall plate retaining screws are loosened
enough to clear the TRT033C body then engage
the top of the TRT033C onto the wall plate

the unit will revert to displaying the
current room temperature 5 seconds after
the last button press. The illumination will
also turn off after 5 seconds.

retaining tabs (see Fig. 3), and push firmly
downwards and then inwards. There will be
some resistance from the terminals. Once in
place, secure with the retaining screws.

A burner symbol is displayed when the
room temperature is below the set temperature
indicating that the thermostat is calling for heat
from the boiler.

Restore mains to the unit after checking all
system wiring is complete.

The night set back function reduces the set
temperature by about 4ºC for a given number
of hours set by the user. It is activated when
the bed symbol is flashing on the display and
the hours of set back remaining are shown on
the main display alternatively with the room
temperature.

To activate night set back press the frost/bed
button ( ) and adjust the number of hours
with the +/- button. To exit night set back,
wait for 5 seconds after any button push
(there is no blue illumination showing),
and press the frost/bed button once.

The frost function reduces the set temperature
to 5ºC. The frost function is activated by
holding down the frost/bed button for 3
seconds. The frost function is terminated by
holding down this same button for 3 seconds.
When in frost mode, the frost symbol ( ) will
flash on the display. The set temperature buttons
remain non-functional during frost mode.

The temperature swing can be adjusted

between 1ºC and 0.5ºC using a jumper found
on the rear of the unit. If the jumper is moved,
please press reset under battery access flap and
adjust set temperature.

Temperature swing – difference between on
and off switching temperatures.

PID control can also be turned on or off using
a jumper on the rear of the unit. PID can
minimise the temperature overshoot.

If the jumper is moved, please press reset
under battery access flap and adjust the set
temperature.

When the batteries need replacing, a battery
symbol will flash on the display.

To clean use a dry cloth only. Do not use any
liquid cleaners.

5. Specifications

Current rating: 3 (1) A

Voltage: 230V, 50Hz

Switch type: Single pole, changeover

Operating
temperature
range: 0ºC to 50ºC

Set temperature
range: 10ºC to 30ºC adjustable in

0.5ºC steps

Complies with: BS EN 60730

Conforms to
directives: Conforms to latest directives

Temperature
swing: 1ºC or 0.5ºC

Micro
disconnection: Type 1.B control action

Batteries: 2 x AA alkaline

For assistance with the product please contact:-

HELPLINE

020 8450 0515

or email [e-mail]

3 Year Guarantee

In the unlikely event of this product becoming

faulty due to defective material or manufacture

within 3 years of the date of purchase, please

return it to your supplier in the first year with proof

of purchase and it will be replaced free of charge.

For years 2 and 3 or any difficulty in the first year

telephone the helpline on

Note: a proof of purchase is required

in all cases. For all eligible replacements (where agreed by

Timeguard Ltd) the customer is responsible for all shipping/

postage charges for sending replacements outside the UK.

All shipping costs are to be paid in advance before

a replacement is sent.

For a product brochure please contact:

Timeguard Ltd. Victory Park, 400 Edgware Road,

London NW2 6ND Tel: [phone]

or email [e-mail]

A Group company

67-058-324 (issue 3)

020 8450 0515.