Smith's Heating First STR7-12V User manual

Dear Installer,
The following items should be included in the carton:
•Product
•Transformer with 450mm of pre-wired mains cable
•2 single-pin male connectors
In the e ent of items missing or isible damage please
contact us on 01245 324560. We would be most grateful
if you would lea e this Installation & User Guide and the
Guarantee Registration Card with the owner of the
property.
Thank you for your co-operation.
Ste e Russell
Customer Ser ice Manager
Sterling
Fan-Assisted Radiator
STR7-12V
Installation & User Guide

2
Introduction
Sterling 12V is primarily intended for installation directly onto a wall at high le el in
bathrooms and other high humidity areas. The maximum recommended installation height
is 2.1 metres to the underside of the heater. There is no clearance required abo e or to
the side of the heater.
Sterling is designed for use on standard two piped pumped central heating systems. Pipes
are 15mm and either pipe may be used as flow or return. This product is not suitable for
one-pipe systems.
The transformer must be located outside the bathroom or high humidity area. The 450mm
lead attached to the transformer must be connected to the fused spur (mains supply).
You will need to pro ide a cable (twin core 0.5mm2 for lengths up to 6 metres, 1.0mm2 for
longer lengths) to connect the terminals on the product to the transformer. The two
single-pin male connectors are pro ided to connect this cable to the transformer terminals.
We recommend the use of full flow isolating al es. The al es should be accessible after
completion of the installation.
We also recommend the fitting of an air ent at the highest point on either the flow or
return pipe to remo e any air trapped within the system.
Sterling is classified as a fixed appliance and electrical connection should be ia a 3A-fused
spur. The fused spur must be located outside the bathroom or high humidity area but
should be accessible after completion of the installation. This appliance must not be
earthed.
To a oid the possibility of ibration the Sterling must be fitted on a flat e en surface.
To conform to Building Regulations Part L (Part J in Scotland) this Sterling model can be
controlled by a remote wall mounted room thermostat (Smith’s En ironmental Products
Part No. RT002). For further details please contact us on 01245 324560.
Please note the guarantee may be invalidated if this product is not installed and used in
accordance with these instructions.

3
Installation
1. Release the outer casing by
remo ing the screws on the
underside of the casing.
2. Secure the heater to the wall
using fixings suitable for the wall
type. Ensure the chassis is flat
to the wall and le el. If
necessary use packing to
compensate for an une en wall
surface. Maximum recommended
installation height is 2.1 metres
to the underside of the heater.
3. Connect the heating system flow
and return pipes to the heater
pipe work. Do not use soldered
fittings to the heater pipe work
as the heat generated could
damage internal wiring and
components. We recommend the
use of full flow ser ice al es.
The al es should be accessible
after completion of the
installation. Check for water
leaks. Vent any trapped air from
the heating system.

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4. Isolate the electrical supply and
connect the transformer to the
fused spur. The transformer must
be located outside the bathroom
or high humidity area. Connect
the single pin male connectors to
the twin core cable you ha e
supplied.
5. Push in the connectors to the
transformer terminals and
connect the other end of the
cable to the terminals on the back
of the heater.
6. Attach the earth bonding
connector to the outer casing and
refit the outer casing to the
chassis.

5
Commissioning
1. Turn on the electrical supply at the fused spur.
2. Set the left hand (fan-only) switch to the blue dot and the right hand (heat output)
switch to II, the fan should run at boost speed.
3. Turn on the central heating system.
4. Set the room thermostat (if fitted) to maximum.
5. Set the left hand (fan-only) switch to the red dot and the right hand (heat output) switch
to I or II – heat will flow within a few minutes.
6. Balance the central heating system if the Sterling is installed on the same circuit as
panel radiators.
7. If the installation is working correctly, remember to reset the room thermostat (if fitted)
to its normal setting.
Please leave this Installation & User Guide with the user for future reference.
Heat utput Performance
It is recommended that the Sterling model is capable of maintaining the calculated heat
losses at normal heat output (I) enabling the boost setting (II) to be used for faster heat up.
Heat utput
Normal Boost
Model Watts Btu/h Watts Btu/h
STR7-12V 1351 4611 1801 6148
The temperature of the water in the central heating system will affect the heat output of
the Sterling model. The heat outputs gi en are tested in accordance with BS 4856 using a
water temperature of 85°C (185°F) at a flow rate of 340 lph (75 gph) and 20°C (66°F)
ambient room temperature. This gi es a temperature difference of 65ºC (117ºF). If your
boiler runs at a lower temperature and/or you prefer a different ambient room
temperature, please refer to the heat output correction factors gi en below.
Temperature Differences/Correction Factor
65°C (149°F) Test Performance
60°C (140°F) Approx. 10% reduction
55°C (131°F) Approx. 20% reduction
50°C (122°F) Approx. 30% reduction

6
Fault Finding
1. Fan does not run on any switch setting.
a. Check the power supply is switched ON.
b. Check fuse in the fused spur.
c. Check the wiring connections at the fused spur.
d. Check the wiring connections at the transformer and product.
2. No heat output on settings I or II.
a. Vent any trapped air from the system (with the system turned OFF).
b. Check the central heating is switched ON.
c. If fitted ensure the room thermostat is calling for heat.
d. Balance the central heating system if installed on the same circuit as panel
radiators and increase the circulating pump speed if required.
e. Increase the boiler water temperature.
In the e ent of difficulty please contact us on 01245 324560. It will be helpful if you do not
disconnect the heater from the central heating system.
Smith's Environmental Products Ltd,
Blackall Industrial Estate, South Woodham Ferrers, Chelmsford, Essex CM3 5UW
Tel: [phone] After Sales: 01245 324560 Fax: [phone]
E-mail: info@smiths-en .com Web: www.smiths-en .com
For the republic of Ireland, contact MT Agencies on 01 864 3363
In light of our policy of continuous de elopment Smith’s En ironmental Products Ltd reser e the right to alter specifications
without prior notice.

7
Dear Customer,
We are delighted you ha e chosen one of our products and trust you
are satisfied with the installation. We would ask you to take a few
minutes to read the User Guide to help you gain maximum benefit
from your Sterling fan-assisted radiator. As with all our products your
Sterling is co ered by a free fi e-year parts and labour guarantee and
we would be grateful if you complete and return the Guarantee
Registration Card to us as soon as possible. This will ensure that
should you require assistance we can deal with you quickly and
efficiently.
Thank you for your co-operation.
Ste e Russell
Customer Ser ice Manager
01245 324900
P.s Your Sterling fan-assisted radiator is designed to operate as
part of your central heating system in the same way as a panel
radiator. Pro iding you lea e the heat output switch in either
the normal I or boost position II and the fan-only switch set to
RED your Sterling will switch on and off automatically with
your central heating system.
Sterling
Fan-Assisted Radiator
STR7-12V
User Guide

8
How a Sterling fan-assisted radiator works
Hot water from your central heating system passes through the heat exchanger transferring
its heat to the aluminium fins. Cooler air is drawn in by the fan and heated as it passes
through the heat exchanger before being expelled gently
back into the room. This not only gi es a more e en
temperature spread but will heat a room up in less than half
the time of a traditional panel radiator.
Sterling heaters include an internal thermostat that pre ents
the fan from operating until the central heating system water
passing through the heat exchanger reaches 40ºC. This
pre ents Sterling circulating cooler air at start up.
Heating
Ensure your central heating system is on, the heat
output set to normal I and the fan-only switch set to
RED (Heating). Pro iding the water temperature in
the system is more than 40ºC and the thermostat/s
controlling your central heating system is calling for
heat your Sterling will switch on.
If you require a faster warm up mo e the heat output
switch to boost II. Mo ing the heat output switch to
will turn off the Sterling.
Air Circulation (Summer Use)
Ensure your central heating is off. Set the fan-only switch to BLUE and the heat output
switch to I or II. Sterling will pro ide a cooling flow of air. If used in conjunction with a
remote thermostat, ensure the thermostat is set to maximum.
Fault Finding
This Sterling is co ered by a free fi e-year parts & labour guarantee. Please refer to the
Fault Finding section of the Installation Guide for ad ice. In the e ent of difficulty please
contact us on 01245 324560. It will be helpful if you do not disconnect the heater from the
central heating system.
Smith's Environmntal Products Ltd,
Blackall Industrial Estate, South Woodham Ferrers, Chelmsford, Essex CM3 5UW
Tel: [phone] After Sales: 01245 324560 Fax: [phone]
E-mail: info@smiths-en .com Web: www.smiths-en .com
For the republic of Ireland, contact MT Agencies on 01 864 3363
In light of our policy of continuous de elopment Smith’s En ironmental Products Ltd reser e the right to alter specifications
without prior notice.
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