Worcester GREENSTAR 24i junior Manuale utente

Supplied By www.heating spares.co Tel. 0161 620 6677

24i, 28i RSF COMBI

USER INSTRUCTIONS &

CUSTOMER CARE GUIDE

G.C. NUMBERS

NATURAL GAS L.P.G.

24i 47 311 37 47 311 38

28i 47 311 54

Supplied By www.heating spares.co Tel. 0161 620 6677

EXCELLENCE COMES

AS STANDARD

Thank you for purchasing a Worcester gas-fired

combination appliance.

Worcester appliances are made by Worcester Heat Systems

and the strictest quality control standards are demanded

throughout every stage of production.

Indeed, Worcester Heat Systems have led the field in

innovative appliance

design and performance

for more than 30 years.

The result is that your

new Worcester 24i or 28i

appliance offers you the

very best of everything –

quality, efficiency,

economical running costs,

proven reliability and

value for money.

What’s more, you also

have the assurance of our

no-nonsense 1 year parts

and labour guarantee.

And it’s backed up by Worcester Care Call – a complete

maintenance scheme to keep your boiler operating at peak

condition and efficiency.

No wonder that more and more people are agreeing that

when it is gas, it has to be a Worcester 24i or 28i

Page No.

Operating Instructions

.................................... 3-11

Fault and Breakdowns 12

Maintenance and

Extended Warranty

Information ............ 13-14

Guarantee Details ... 15-16

CONTENTS

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GENERAL

INFORMATION

GAS SAFETY (INSTALLATION AND USE)

REGULATIONS 1998

It is the law that all gas appliances must be installed by a

competent person in accordance with the above regulations. Failure to

install appliances correctly could lead to prosecution. It is in your

interest and that of safety to ensure compliance with the law. The

manufacturers notes must not be taken, in any way, as over-riding

statutory obligations.

WARNING: This appliance must be earthed and protected by a 3

amp fuse.

ELECTRICITY SUPPLY: 230V ~ 50Hz

IMPORTANT: To get the best from your Worcester appliance

please read these instructions carefully.

NOTE: In the event of a fault the appliance should not be used

until the fault has been corrected by a competent person.

BENCHMARK

All CORGI Registered Installers carry a CORGI ID card and have

a registration number which must be recorded in your central heating

log book. You can check that your installer is CORGI registered by

calling CORGI on 01256 372300.

GENERAL DESCRIPTION

(See Fig.1.)

The WORCESTER 24i or 28i is a combined domestic hot water

and central heating appliance. It consists of a gas fired boiler having a

varying output of between 7.5 kW and 23.4 kW (24i) or 8.5 kw and

27.5 kw (28i), a combined heat-exchanger and all necessary controls to

provide mains fed domestic hot water and central heating.

The appliance can operate in one of two modes as required. Hot

water only or hot water and central heating.

Hot Water Mode:

When a demand is made for hot water by opening a tap or

shower the flow switch will energise and the burner will light at its

maximum setting.

When hot water is no longer required the appliance pump and

fan may continue to operate to dissipate the excess heat within the

boiler.

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A flow restrictor is fitted within the appliance which limits the

hot water delivery rate to a maximum of 8.0 (±15%) litres/minute

(1.8 gallons/minute) 24i or 10 (±15%) litres/minute (2.2 gallons/minute)

28i.

Hot Water and Central Heating mode:

When a demand is made for heating by the system controls (i.e. a

programmer or room thermostat).

The pump will energise circulating primary water around the

heating system and the burner will light. The heat output from the

appliance in this mode has been factory set to maximum. The

appliance will operate as necessary to maintain the temperature of the

radiators at the level set by the adjustment of the Heating

Temperature Control Knob.

(See Fig. 2.)

If the system no longer

requires output to maintain

the desired room temperature,

the burner will extinguish.

The pump and fan will

continue to run for a short

period to dissipate the

residual heat from the

appliance and then switch off.

The appliance will supply

heat to the central heating

system as required. A demand

for hot water at a tap or

shower will override the

central heating function for

the period of the domestic hot

water demand.

Fig. 1. System Diagram.

Automatic

air vent

Gas to water

heat

exchanger

Circulating

pump

Fixed

by-pass

Flow

switch

return

Domestic

hot water

out Domestic

cold

supply

Safety

discharge

Pressure

relief valve

Boiler

Expansion

vessel

flow

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CENTRAL HEATING SYSTEM

During the first few hours of operation of the central heating

system, check that all radiators are being heated at an even rate.

Should the upper area of a radiator be at a lower temperature than the

base of the radiator, it should be vented by releasing air through the

venting screw at the top of each radiator. Make sure your installer

shows you how to carry out the operation. Repeated venting will

reduce the quantity of water in the system and this must be

replenished for safe and satisfactory operation of the appliance.

Should water leaks be found in the system or excessive venting be

required from any radiator, a service engineer should be contacted and

the system corrected.

SEALED HEATING SYSTEM

The appliance will be fitted to a sealed heating system which is

pre-pressurised. Your installer will advise you on the minimum and

maximum pressure that should be indicated on the pressure gauge.

See Fig. 2. Check regularly that this pressure is maintained and

contact your installer or maintenance engineer if there is a permanent

significant drop in pressure indicated on the gauge. If the system loses

pressure it should be re-pressurised as instructed by the installer

(N.B. Maximum pressure 2.5 bar).

CLEARANCES

Your installer will have provided adequate space around the

appliance for safety and servicing. Do not restrict this space by the

addition of cupboards, shelves etc. close to the appliance.

Minimum clearances in millimetres.

ROOM THERMOSTAT

A room thermostat may be fitted for control of the central heating

temperature. It will be located in one room of the home. The method

of setting a room thermostat varies with the type and manufacture.

Refer to the instructions supplied with the room thermostat.

THERMOSTATIC RADIATOR VALVES

If thermostatic radiator valves are to be fitted to the system then

they must conform to the requirements of BS2767:1972. It is advisable

to leave one valve permanently set at maximum to prevent the boiler

short cycling.

GENERAL NOTES

RSF

Left-hand side 10

Right-hand side 10

In Front 600

Above 180

Below 200

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SHOWERS, BIDETS, TAPS AND MIXING

VALVES

Standard hot and cold taps and mixing valves used with the

appliance must be suitable for operating at the available mains

pressure. Thermostatically controlled or pressure equalising shower

valves will guard against the flow of water at too high a temperature.

Hot and cold mains fed water can be supplied direct to an

overrim flushing bidet subject to local water company requirements.

With all mains fed systems the flow of water from the individual

taps will vary with the number of outlets operated simultaneously

and the cold water mains supply pressure to the property. Flow

balancing using ‘Ball-o-Fix’ type valves is recommended to avoid an

excessive reduction in flow to individual outlets.

For further information contact Worcester Heat Systems Ltd.

HOT AND COLD FLOW

If the flow of water demanded from both hot and cold service

outlets is dependent upon mains supply, it may not be possible in

some installations to operate all outlets simultaneously.

WATER MAINS FAILURE

It is important to note that in the event of a mains water supply

failure, no tap water will be available until the mains supply is

restored.

USE IN HARD WATER AREAS

In temporary hard water areas (more than 350mg/litre or 200ppm

calcium bicarbonate) it is recommended that a proprietary scale

reducer is fitted in the mains cold water connection to the appliance.

Consult the local water company for additional advice.

Installation of a scale inhibitor assembly should be in accordance

with the requirements of the local water company. An isolating valve

should be fitted to allow servicing.

The water hardness can be determined by reference to the local

water company.

DOMESTIC HOT WATER TEMPERATURE

CONTROL

By slightly reducing the flow of domestic water from the tap, the

delivery temperature will be increased. This is of particular advantage

in the winter, for example to increase bath water temperature and to

remove heavy grease deposits on plates, etc. Also this will provide an

added advantage of reducing the delay before hot water is obtained.

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VENTILATION OF THE APPLIANCE

This is a room sealed appliancem, any ventilation openings in a

wall or door must not be obstructed. Do not allow the flue terminal

fitted on the outside wall to become obstructed or damaged.

If the appliance is fitted in a compartment do not use the

compartment for storage purposes unless it conforms to the

requirements of BS 6798:1987: Section 6 and the requirements of

Section 6. Air Supply in the Installation Instructions. It is essential

that the airing space is separated from the boiler space by a perforated

non-combustible partition as described in BS 6798:1987.

NOTE: Do not place anything on top of the appliance.

CIRCULATING PUMP

This may be fitted with a speed adjuster. If so it will be factory

set at maximum and should not be changed.

FROST PRECAUTIONS

Your British Gas Engineer, or any service engineer will advise

you on suitable frost precautions.

For short periods the built-in frost protection of the appliance

will be adequate.

If the appliance is not to be used for a long period of time and

there is a likelihood of freezing, then the appliance should be drained.

SERVICE

Annual servicing is important in order to ensure continuing high

efficiency and long life for your appliance. In the event of any

difficulty in making suitable servicing arrangements, Worcester Heat

Systems Limited, your British Gas Engineer or other competent

persons will discuss regular servicing arrangements and offer a

comprehensive maintenance contract.

IMPORTANT: Do not touch or adjust any sealed component.

WARNING

If a gas leak exists, or is suspected, turn off the gas supply to the

appliance at the service cock and consult your local British Gas

Engineer or service engineer.

Do not touch any electrical switches to turn them either on or off.

Open all windows and doors. Do not smoke. Extinguish all naked lights.

CLEANING

Do not use abrasive cleaners on the outer casing. Use a damp

cloth and a little detergent.

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OPERATION OF

CONTROLS

(See also label on inside of appliance front panel).

The appliance is fitted with the following controls:

CENTRAL HEATING TEMPERATURE

The position of this knob will determine the temperature of the

water delivered to the radiators between the ‘I’ and ‘MAX’ position.

When the knob is turned anti-clockwise past the ‘I’ position towards

the ‘’(Summer Position), then the appliance will operate in the

HOT WATER mode only and no heat will be delivered to the radiators.

FACIA MOUNTED PROGRAMMER (if fitted)

Your installer may have fitted a mechanical programmer into the

facia of your appliance. Operating instructions are supplied with the

programmer.

SYSTEM PRESSURE GAUGE

The red needle has been set to show the sealed system pressure

which is required for the appliance to operate effectively. The grey

needle will show the actual pressure in the system.

INDICATOR LIGHT

Mains electricity indicator:

OFF : No mains electricity to the appliance

ON : Mains electricity is connected to the

appliance

FLASHING : Sensor fault.

OVERHEAT CUT-OFF

THERMOSTAT

The appliance will enter a lockout condition in the event of

overheating.

An overheat cut-off thermostat is fitted to the appliance which

will interrupt the electricity supply to the ignition circuit.

If the overheat cut-off has operated the fan and/or pump will run

but the burner will not light. (No spark generation).

The appliance can be reset by pressing the overheat cut-off

button.

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Fig. 2. 24i/28i Controls.

Mains indicator

Central heating temperature

control and on/off knob

System pressure

gauge

Overheat cut-off

button

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TO LIGHT THE APPLIANCE

Check that the water valves to the central heating circuit are open.

Check that the grey needle on the pressure gauge is not below

the required pressure.

Switch on the mains electricity. The power on indicator will

light. Set the room thermostat, if fitted, to maximum. Turn the central

heating temperature control knob to ‘MAX’.

The burner will light.

Set the central heating control knob and the room thermostat, if

fitted, to the desired temperature.

Fig. 3. 28i with front panel removed.

Circulating

pump

Front panel

hook

DA A

PLA E

Locating peg

Burner

viewing

window

Gas valve

TO LIGHT AND STOP THE

APPLIANCE

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