Smith's Heating First STR7-12V User Manual

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Page 1

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 event of items missing or visible damage please contact us on 01245 324560. We would be most grateful if you would leave this Installation & User Guide and the Guarantee Registration Card with the owner of the property.

Thank you for your co-operation.

Steve Russell Customer Service Manager

Sterling

Fan-Assisted Radiator

STR7-12V

Installation & User Guide

Page 2

Introduction

Sterling 12V is primarily intended for installation directly onto a wall at high level 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 above 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 provide 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 provided to connect this cable to the transformer terminals.

We recommend the use of full flow isolating valves. The valves should be accessible after

completion of the installation.

We also recommend the fitting of an air vent at the highest point on either the flow or

return pipe to remove any air trapped within the system.

Sterling is classified as a fixed appliance and electrical connection should be via 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 avoid the possibility of vibration the Sterling must be fitted on a flat even 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 Environmental 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.

Page 3

Installation

1. Release the outer casing by

removing 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 level. If necessary use packing to compensate for an uneven 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 service valves. The valves 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 have 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.

Page 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 Output 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 Output

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 given 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 gives 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 given 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

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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 event 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: 01245 324900 After Sales: 01245 324560 Fax: 01245 324422

E-mail: info@smiths-env.com Web: www.smiths-env.com

For the republic of Ireland, contact MT Agencies on 01 864 3363

In light of our policy of continuous development Smith’s Environmental Products Ltd reserve the right t o alter specifications

without prior notice.

Page 7

Dear Customer,

We are delighted you have 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 covered by a free five-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.

Steve Russell Customer Service 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. Providing you leave 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

Page 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 gives a more even 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 prevents the fan from operating until the central heating system water passing through the heat exchanger reaches 40ºC. This prevents 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). Providing 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 move the heat output switch to boost II. Moving the heat output switch to

O 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 provide a cooling flow of air. If used in conjunction with a remote thermostat, ensure the thermostat is set to maximum.