Worcester 26CDi Xtra Manuel utilisateur

26CDi XTRA

USER INSTRUCTIONS &

CUSTOMER CARE GUIDE

G. C. NUMBERS.

NATURAL GAS. L. P. G.

47 311 41 47 311 42

IMPORTANT: THIS APPLIANCE IS FOR USE WITH NATURAL GAS OR LPG.

THESE INSTRUCTIONS APPLY IN THE UK ONLY.

THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER OR AT THE GAS METER

26CDi XTRA

EXCELLENCE COMES

AS STANDARD

Thank you for purchasing the Worcester 26CDi Xtra gas-

fired combination appliance.

Worcester 26CDi Xtra 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 26CDi Xtra

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, to keep your boiler operating at peak condition and

efficiency, an optional maintenence scheme is available from

Worcester Heat Systems Ltd. Contact our Service Contracts Team

on 01905 754624 for further details.

Page No.

Operating Instructions

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

Fault and Breakdowns 12

Maintenance and

Extended Warranty

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

Guarantee Details ... 15-16

CONTENTS

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 overriding

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 26CDi Xtra 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.

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.

Without the completion of the log book, manufacturers may refuse to

respond to a call-out request. It is important that your installer has given you the

fully completed log book.

GENERAL DESCRIPTION

(See Fig.1.)

The WORCESTER 26CDi Xtra is a condensing, combined domestic hot water

and central heating appliance. It consists of a gas fired boiler with a secondary, high

efficient heat exchanger, having a varying output of between 6.7 kW and 26 kW. A

water to water heat exchanger to provide domestic hot water via the boiler,

circulating pump and water diverting valve. All the necessary controls to provide

mains fed domestic hot water and central heating.

The appliances are supplied as standard with a manual operating

switch. Alternatively a facia mounted programmer may have been fitted.

The appliance can operate in one of two modes. Hot water only or hot water

and central heating.

PLUMING: Because the appliance operates at high efficiency a white

plume of condensate will be emitted from the flue terminal which is fitted

outside the dwelling. The pluming will be more noticeable during cooler weather

and will occur every time the appliance is used.

Hot Water Mode:

When a demand is made for hot water by opening a tap or shower, the flow

switch will energise the pump and circulate primary hot water around the boiler and

water to water heat exchanger. 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 residual heat within the boiler.

A flow restrictor is fitted within the appliance which limits a hot water

delivery rate to a maximum of 9.0 (±15%) litres/minute (2.0 gallons/minute). 3

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. 3.)

If the system no longer requires output to maintain the desired

room temperature, the burner will extinguish. The pump will

continue to run for a short

period to dissipate the

residual heat from the

appliance and then switch off.

The pump will run for

the duration of the demand

and only shut off if the room

thermostat or programmer is

satisfied.

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.

NOTE: If in doubt about

the use of the controls ask

your installer to assist you.

Fig. 1. Appliance Water Flow Diagram.

Secondary Heat

Exchanger

Automatic

Air Vent

Circulating

Pump

Water To Water

Heat Exchanger

Water Diverter

Valve

Pressure Relief

Valve

Condensate

Drain

Safety

Relief

Return

Flow

Domestic Cold

Water Supply

Domestic Hot

Water Out

Gas To Water

Heat Exchanger

Boiler

Expansion

Vessel

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, your installer or heating 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. 3.

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).

Pressurising The System (See Fig. 2).

(If in doubt leave this procedure to your installer).

Remove the bottom panel to gain access to the

filling loop assembly.

Insert the bayonet end of the filling key into the

corresponding cut outs in the filling loop housing and

twist to lock the key in place.

Turn the grey knob anti-clockwise to allow water

ingress and fill until the required pressure is reached.

Turn the grey knob clockwise to stop filling and

remove. Remove the filling key by lining up the bayonet

end of the key with the cut outs in the filling loop

housing and withdrawing the key.

N.B. The key must always be removed from the

filling loop housing after the system has been filled to

prevent accidental filling and to comply with Bylaw 14

of the Water Bylaws Scheme.

Store the key in a safe place for future use and refit

the bottom panel.

GENERAL NOTES

Fig. 2.

Grey

Knob

Filling Key

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 BS2767:10. 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 mains pressure.

Thermostatically controlled shower valves will guard against the flow

of water at too high a temperature.

If using a pressure equalising valve, set the Domestic Hot Water

temperature control knob to the ‘MAX’ position.

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

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. The appliance can still be used for heating because it is fitted

to a sealed system.

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.

POSITION CLEARANCE

Left-hand side 10

Right-hand side 10

In Front 600

Above 180

Below 200

VENTILATION OF ROOM SEALED FANNED

FLUE (RSF) APPLIANCES

This is a room sealed appliance and 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.

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 6798:1987: Section 6. 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.

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 be happy to discuss

regular servicing arrangements and offer a comprehensive

maintenance contract.

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.

CLEANING

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

cloth and a little detergent.

CONDENSATE DRAIN

Your installer will have provided a plastic condensate drain pipe

from the appliance.

The pipe should discharge into the household drainage system,

outside gully or soak away.

OPERATION OF

CONTROLS

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

The appliance is fitted with the following controls:

See fig. 3.

OPERATING SWITCH

In the ‘0’position there is no mains electricity to the

appliance.

In the ‘I’ position mains electricity is connected to the

appliance.

CENTRAL HEATING TEMPERATURE

CONTROL

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.

DOMESTIC HOT WATER TEMPERATURE

CONTROL

The position of this knob will determine the temperature of the

water delivered at the domestic hot water taps between the ‘0’ and

the ‘MAX’ position.

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. 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 any of the indicator lights

are flashing.

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 LIGHTS

Mains electricity indicator:

OFF : No mains electricity to the appliance

ON : Mains electricity is connected to the

appliance

Central heating demand indicator:

OFF :No demand for heat to the central

heating circuit

ON :Central heating demand

FLASHING SLOW : Ignition lockout

(once per second)

FLASHING FAST : Appliance fault (other than ignition

(five times per second) lockout)

Domestic hot water demand indicator:

OFF :No demand for domestic hot water

ON : Domestic hot water demand

FLASHING FAST :Air flow fault.

(five times per second)

Central heating and domestic hot water demand indicators:

BOTH FLASHING SLOW :Overheat cut-off

(once per second)

Flame detection indicator:

OFF :Burner off

ON :Burner on

Fig. 3. Controls.

Operating

switch

Mains

electricity

indicator

Reset

button

Flame detection

indicator

DHW demand

indicator

Central heating

demand indicator

CH temp

control knob

DHW temp

control knob

System pressure

gauge

26CDi XTRA

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 green power on indicator

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

central heating temperature control knob to ‘MAX’. The red central

heating demand indicator will light.

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

Set the central heating and hot water temperature control knobs

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 to the ‘O’ position.

For Long Periods

Turn the operating switch to the ‘O’ position. Switch off the

mains electricity.

A facia mounted electronic programmer will retain its settings for

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

programme. The display will disappear

after approximately 12 hours.

A facia mounted mechanical

programmer will require resetting once

the operating switch has been set to ‘O’,

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, both the central heating and

the hot water demand indicators will

flash together.

Fig. 4. 26CDi Xtra with front panel removed.

Circulating pump

Clip

Locating peg

Expansion

vessel

Gas valve

TO LIGHT AND STOP THE

APPLIANCE

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