Cylinder/Pipe
Thermostat
Cat. No. TRT044
Operating & Installation Instructions
80
70
1
C
2
60
50
40
°C
What is a cylinder thermostat?
1
C
2
...an explanation for householders
A cylinder thermostat switches on and off
the heat supply from the boiler to the
hot-water cylinder. It works by sensing the
temperature of the water inside the cylinder,
switching on the water heating when the
temperature falls below the thermostat
setting, and switching it off once this set
temperature has been reached.
Turning a cylinder thermostat to a higher
setting will not make the water heat up
any faster. How quickly the water heats
up depends on the design of the heating
system, for example, the size of boiler and
the heat exchanger inside the cylinder.
The water heating will not work if a
time switch or programmer has switched
it off. And the cylinder thermostat will
not always switch the boiler off,
because the boiler sometimes
needs to heat the radiators.
Cylinder thermostats are usually fitted
between one quarter and one third of the
way up the cylinder. The cylinder thermostat
will have a temperature scale marked on it,
and it should be set at between 60ºC and
65ºC, then left to do its job. This temperature
is high enough to kill off harmful bacteria
in the water, but raising the temperature
of the stored hot water any higher will
result in wasted energy and increase
the risk of scalding.
If you have a boiler control thermostat,
it should always be set to a higher
temperature than that of the cylinder
thermostat. In most boilers, a single boiler
thermostat controls the temperature of
water sent to both the cylinder and
radiators, although in some there are
two separate boiler thermostats.
®
1. Introduction
80
70
1
C
2
60
50
40
°C
1
C
2
TRT products are a cost effective
comprehensive range of thermostats and
controllers designed for internal use only.
The TRT044 is cylinderstat, with an easily
adjustable dial. It is designed to be
mounted to a domestic hot water
cylinder using a spring wire, and allows
the user to economically control the
temperature of the hot water. It can
be fitted to all hot water cylinders, or
alternatively it can be used as a pipestat
using the alternative wire strap supplied.
The TRT044 can be used to switch
a circulating pump, boiler, or most
common motorised zone valves. It can
also be used for switching domestic 13A
immersion heaters if required.
TRT044 Cylinder/Pipe Thermostat
Side View
Cylinder/Pipe
contact
Rear View of TRT044
2
1
Easy
set dial
Front View of TRT044
40
°C
50
Clearly
marked
dial
60
70
80
Temperature
adjustment
knob
Cover
retaining
screw
Stylish
design
Wiring
terminals
C
Earth
terminal
Cable
entry
The electrical supply must be isolated
before attempting to install the TRT044.
.
Fig. 1a
Fig. 1b
Fig. 1c
Contents
TRT044 cylinder thermostat
TRT044 instruction leaflet
Spring wire
Wire strap
2. Siting
The TRT044 is designed to be surface mounted
onto the domestic hot water cylinder. For
cylinders with an insulating foam covering, a
section of foam must be removed so the back
of the thermostat is in direct contact with the
metal body of the tank.
The TRT044 should be mounted between a
quarter and third of the way up from the base
of the tank in a position that gives good access
to the dial.
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.
Always isolate the mains supply before
starting work.
Incoming cable should be 1.5mm sq.
Remove cover from unit by unscrewing cover
retaining screw, and easing off the temperature
adjusting knob.
Thread incoming wire though the cable gland.
Allow sufficient excess cable to wire up the
unit, but not too much to make it difficult to
close the cover on the unit.
Connect the conductors to the relevant
terminals, according to the wiring diagram.
Ensure that the brass washer grips the conductor.
Pull some of the excess cable back through the
gland and then tighten the gland to trap the
cable and give good strain relief.
Replace the cover and the adjustment knob.
Adjust the length of the spring wire, and use it
to strap the TRT044 to the hot water cylinder.
Restore mains to the unit after checking all
system wiring is complete.
Wiring Diagram
Note:
Check boiler
instructions
before
connecting.
Terminals C and 2 make on temperature rise.
Terminals C and 1 make on temperature fall.
Fig. 2
TRT044
Cylinderstat
C12
4. Operation
Use adjuster dial to set desired temperature.
For vulnerable people it may be advisable to
reduce the setting to as low as 50ºC bearing in
mind the outlet water temperature will be
somewhat higher than this due to the
temperature stratification in the tank.
To clean use a clean dry cloth only. Do not use
any liquid cleaners.
5. Specifications
Current rating: 16 (4) A
Voltage: 230V, 50HZ
Switch type: Single pole, double throw
(SPDT)
Operating
temperature range: 0°C to 55°C
Set temperature
range: 40°C to 80°C
Complies with: BS EN 60730
Conforms to
directives: Conforms to
latest directives
For assistance with the product please contact:-
HELPLINE
020 8450 0515
or email helpline@timeguard.com
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: 020 8452 1112
or email csc@timeguard.com
A Group company
67-058-330 (issue 2)
020 8450 0515.
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