Worcester GREENSTAR 24i junior Manuel utilisateur

24i /28i junior

USER INSTRUCTIONS &

CUSTOMER CARE GUIDE

G.C. NUMBERS

APPLIANCE NATURAL GAS L.P.G.

24i junior 47 311 69 47 311 71

28i junior 47 311 70 47 311 72

EXCELLENCE COMES

AS STANDARD

Page No.

Operating Instructions

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

Fault and Breakdowns 12

Maintenance and

Extended Warranty

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

Guarantee Details ... 15-16

CONTENTS

Thank you for purchasing a Worcester ijunior Series gas-

fired combination appliance.

Worcester ijunior Series 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 ijunior

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 Worcester ijunior Series.

GENERAL

INFORMATION

GAS SAFETY (INSTALLATION AND USE)

REGULATIONS 1998

It is the law , in GB, 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.

In GB a competent person is someone registered with CORGI.

All CORGI Registered Installers carry a CORGI ID card and have a

registration number. Both should be recorded in your central heating

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

calling CORGI on 01256 372300.

In Eire the installation must be in accordance with IS 813.

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

amp fuse to BS 1362.

ELECTRICITY SUPPLY: 230V ~ 50Hz

IMPORTANT: To get the best from your Worcester ijunior

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

The Benchmark initiative is a code of practice to encourage the

correct installation, commissioning and servicing of domestic central

heating boilers and system equipment.

A 'log book' is dispatched with every appliance, This is a vital

document that needs to be completed by the installer at the time of

installation. It confirms that the boiler has been installed and

commissioned according to the manufacturers instructions.

In Eire the declaration found in IS 813 must be completed.

Without the completion of the log book and/or the declaration,

manufacturers may refuse to respond to a call-out request. It is

important that your installer has given you the fully completed log

book and/or declaration.

GENERAL DESCRIPTION

The WORCESTER ijunior models are combined domestic hot

water and central heating appliances. They consist of a gas fired boiler

having a varying output of between 7.5kW and 23.5kW (24i junior) or

8.0 and 27.5kW (28i junior), and all the necessary controls to provide

mains fed domestic hot water and central heating.

The appliances can operate in one of two modes. Hot water only

or hot water and central heating.

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) 24ijunior or 10 (±15%) litres/minute (2.2

gallons/minute) 28ijunior.

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 appliance will operate as necessary to maintain the

temperature of the radiators at the level set by the adjustment of the

Heating Temperature Control.

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.

Hot Water Only mode:

The appliance operates to supply only domestic hot water when

the heating temperature mode is fully anti-clockwise, at the position.

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 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.

SEALED HEATING SYSTEM

The appliance must 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. 1. 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.

NOTE: The set pressure will normally be 1 to 1.5 bar. The

maximum operating pressure is 2.5 bar.

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.

GENERAL NOTES

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.

NOTE: If the appliance is to be enclosed after the

installation then the instructions given in Section 4, Siting

the Appliance, of the Installation Book MUST be followed.

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

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. It is essential that the airing space is

separated from the boiler space by a perforated non-combustible

partition as described in BS 6798.

ROOM THERMOSTAT

A room thermostat must 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 fitted to the system then they

must conform to the requirements of BS2767. It is advisable to leave

one valve permanently set at maximum to prevent the boiler short

cycling.

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 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

Technical Helpline.

HOT AND COLD FLOW

The flow of water demanded from both hot and cold service

outlets is dependent upon mains supply and 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. The appliance can still be used for heating as it is connected

to a sealed system.

Service

Left-hand side 10 25

Right-hand side 10 25

In Front 600 *25

Above flue elbow 30 30

Below 200 200

CLEARANCES

Unventilated

compartment

Minimum clearances in millimetres.

*Front clearance is to a removable

panel or door.

VENTILATION OF ROOM SEALED FANNED

FLUE APPLIANCES

These are room sealed appliances and do not require any

ventilation openings. Do not allow the flue terminal fitted on the

outside wall to become obstructed or damaged.

USE IN HARD WATER AREAS

Normally there is no need for scale protection. However, in areas

of exceptionally hard water supply it is recommended that an In-Line

scale inhibitor be fitted.

Installation should be strictly in accordance with the

requirements of the local Water Company. An isolating valve to

facilitate servicing should be incorporated.

The water hardness may be determined using the standard test

paper or by reference to the local Water Company.

Further information may be obtained from Worcester Heat

Systems Technical Helpline.

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

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.

The Worcester Heat Systems Technical Helpline will advise you on

suitable frost precautions. For short periods the built-in frost

protection of the appliance will be adequate.

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 or other competent persons will discuss regular

servicing arrangements and offer a comprehensive maintenance

contract.

CLEANING

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

cloth and a little detergent.

Under no circumstances should any seal on the boiler be broken.

▲

CENTRAL HEATING TEMPERATURE

CONTROL

The position of this knob will determine the temperature of the

water delivered to the radiators between fully clockwise and anti-

clockwise to the mark. When the knob is turned anti-clockwise

past the 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.

HOT WATER TEMPERATURE CONTROL

There is no separate temperature control.

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

delivery temperature of the water will be further 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.

FACIA MOUNTED PROGRAMMER (if fitted)

Your installer may have mounted either a mechanical or an

electronic programmer into the facia of your appliance. Operating

instructions are supplied with the programmer.

RESET BUTTON

Press this button in for five seconds if the indicator light is

flashing slowly.

If indicator lamp is flashing fast turn power OFF and ON at the

switched socket supply to reset.

SYSTEM PRESSURE GAUGE

The black needle will show the actual pressure in the system.

When operating the pressure indicated must not be greater than

2.5bar. If it is then contact your installer.

OPERATION OF

CONTROLS

Fig. 1. Controls.

Fault indicator and

reset button

Flame detection

indicator

CH temperature

control knob

System pressure

gauge

Space for optional

plug in programmer

INDICATOR LIGHTS

Flame detection indicator:

OFF:Burner off

ON:Burner on

Fault indicator:

FLASHING SLOW:Ignition lockout or

(once per second) boiler overheat

FLASHING FAST: Appliance fault

(five times a second)

TO LIGHT AND STOP THE

APPLIANCE

CH Control in

fully clockwise position

CH Control in

fully anti-clockwise position

TO LIGHT THE APPLIANCE

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

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

the required system pressure.

Switch on the mains electricity. Set the room thermostat to

maximum. Turn the central heating temperature control knob fully

clockwise.

The burner will light and the red flame detection indicator will light.

Set the central heating temperature control knob and the room

thermostat, if fitted, to the desired temperature.

TO STOP THE APPLIANCE

For Short Periods

Turn the central heating temperature control knob fully anti-

clockwise past the position. NOTE: The appliance will still operate

in the domestic hot water mode.

For Long Periods

Turn the central heating temperature control knob fully anti-

clockwise past the position. Switch off the electricity at the mains

supply.

A facia mounted electronic programmer will retain its settings for

about two weeks, after which it will return to the factory set

programme. The time will be saved for approximately 7 hours. The

display will disappear after approximately 1 hour.

A facia mounted mechanical programmer will require resetting

once the central heating temperature control knob has been set fully

anti-clockwise past the position, or the mains supply has been

disconnected.

ELECTRICITY SUPPLY

FAILURE

If the electricity supply fails the appliance will not operate. Once

the supply is restored the appliance will return to normal operation. If

a programmer is fitted, check that the settings have been maintained.

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 gas valve.

If the overheat cut-off has operated, the fault indicator will flash once

a second.

The appliance can be reset by pressing the fault indicator button

and holding in for 5 seconds when the appliance has cooled. If this

condition continues to occur, then call a service engineer.

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