Worcester Highflow 400 Electronic Series Manuel utilisateur

HIGHFLOW 400 ELECTRONIC

SERIES

USER INSTRUCTIONS &

CUSTOMER CARE GUIDE

G.C. NUMBERS

APPLIANCE NATURAL GAS L.P.G.

Fanned Flue (RSF) 47 311 61 47 311 64

Balanced Flue (BF) 47 311 62

Open Flue (OF) 47 311 63

EXCELLENCE COMES

AS STANDARD

Thank you for purchasing a Highflow 400 Electronic

gas-fired combination appliance.

Highflow 400 Electronic Series appliances are made by

Worcester Heat Systems and the strictest quality control stan-

dards are demanded throughout every stage of production.

Indeed, Worcester Heat Systems have led the field in inno-

vative appliance design and performance for more than 30

years.

The result is that

your new Highflow 400

Electronic appliance offers

you the very best of every-

thing - quality, efficiency,

economical running costs,

proven reliability and

value for money.

What’s more,

you also have the assur-

ance of our no-nonsense 1

year parts and labour guar-

antee.

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 Highflow 400 Electronic

Series.

Page No.

Operating Instructions

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

Fault and Breakdowns 12

Maintenance and

Extended Warranty

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

Guarantee Details .. 15-16

CONTENTS

GAS SAFETY (INSTALLATION AND USE)

REGULATIONS 1998

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

tent 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 Highflow 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.

GENERAL DESCRIPTION

(See Fig.1.)

The HIGHFLOW 400 ELECTRONIC MODELS are combined

domestic hot water and central heating appliances. They consist of a

gas fired boiler having a varying output of between 8.8/11 kW and 24

kW, a heatbank containing stored primary water, a heat-exchanger to

provide domestic hot water via the boiler, a circulating pump, water

diverting valve and all necessary controls to provide central heating

and mains fed domestic hot water and central heating.

The hot water delivery rate is limited to 18 l/m. The specific

rate, declared as part of the relevant standard, is 20 l/m. To achieve

this a tank temperature of 75°C is required.

The appliances can operate in one of three modes. Hot water

only or hot water and central heating or heating only.

Hot Water Mode:

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

er hot water will be delivered almost immediately. The flow turbine

will energise the pump and circulate primary hot water around the

boiler and water to water heat exchanger. The burner will light to

maintain the temperature of the heatbank.

When hot water is no longer required the appliance will contin-

ue to operate, the burner will cycle a number of times, until the heat-

bank has returned to temperature. The pump will continue to run for

a few minutes to dissipate the residual heat around the appliance.

If no hot water demand is made then the boiler will only use

enough energy to maintain the temperature of the heatbank.

The maximum temperature of the water drawn off from the

heatbank is governed by the setting of the Hot Water Temperature

Control. (See Fig.2.)

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

water delivery rate to a maximum of 18 (±15%) litres/minute.

The restrictor is removed by the installer if a cistern feed hot

water system is installed.

GENERAL

INFORMATION

Hot Water and Central Heating Mode:

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.

When domestic hot water is no longer required the burner and

pump will continue to operate until the heatbank is back to the

required temperature.

The appliance will then return to the central heating state and

its normal mode of operation.

Similarly the hot water is occasionally diverted from the central

heating system into the heatbank to maintain the stored primary hot

water temperature.

NOTE: If in doubt about the use of the controls ask your

installer to assist you.

Central Heating Mode:

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

a programmer or room thermostat).

The water diverter valve will open, the pump will energise circu-

lating primary water around the heating system and the burner will

light. The appliance will operate as necessary to maintain the temper-

ature of the radiators at the level set by the adjustment of the Heating

Temperature Control. (See Fig. 2.)

If the system no longer requires heat to maintain the desired

room temperature, the burner will extinguish. The pump will contin-

ue to run for a short period to

dissipate the residual heat from

the appliance and then switch

off.

Fig. 1. System Diagram of Highflow 400 Electronic Series.

Primary

Water

circulation

Water

diverter

valve

From

radiators

Mains

cold in

Flow tur-

bine

Domestic hot

water out

Expansion

vessel

Slot in

front cover.

(O.F. only)

Pilot obser-

vation win-

dow.

radiators

Circulating

pump

Heat

exchanger

Heatbank

Burner

Boiler

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 replen-

ished 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 sys-

tem corrected.

SEALED HEATING SYSTEM

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

pre-pressurised. In this case your installer will advise you on the min-

imum and maximum pressure that should be indicated on the pres-

sure gauge. See Fig. 3. Check regularly that this pressure is main-

tained 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: Some sealed systems do not require pre-pressurisation. If

this type of system has been used by your installer he will advise you

of any special maintenance that is required to ensure that the system

is always full of water.

Should any 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.

OPEN VENTED HEATING SYSTEM

The appliance may be fitted to an open vented heating system

your installer will advise you. There is no need to check the pressure

gauge.

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.

GENERAL NOTES

BF Models OF Models RSF Models

Left-hand side 5 5 5

Right-hand side 5 70 5

In Front 600 600 600

Above 10 10 10

ROOM THERMOSTAT

A room thermostat may be fitted for control of the central heat-

ing temperature. 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.

SHOWERS, BIDETS, TAPS AND MIXING

VALVES

Standard hot and cold taps and mixing valves used with the appli-

ance must be suitable for operating at the available mains pressure. The

use of 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 over-

rim flushing bidet subject to local water company requirements.

With all mains fed systems the flow of water from the individ-

ual taps will vary with the number of outlets operated simultaneous-

ly and the cold water mains supply pressure to the property. Flow bal-

ancing 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. Cistern fed hot water supply will stop once the cistern has

emptied but the appliance can still be used for heating provided that

the system is of the sealed system type. Open vent central heating

systems should be turned off until the supply is restored.

USE IN HARD WATER AREAS

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 require-

ments 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 Limited.

AIR SUPPLY FOR OPEN FLUED (O.F.)

APPLIANCES

Fresh air is required for combustion

Your installer will have made arrangements for an adequate sup-

ply of fresh air to the appliance. Do not block up any air ways which

may be let into a wall or door. Do not hang clothes or other com-

bustible materials over the appliance or against the flue pipe.

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. In particular, the flue pipe should not pass

through an airing cupboard space unless protected by a guard (such as

wire mesh) concentrically spaced 25mm, as described in BS

6798:1987.

VENTILATION OF BALANCED FLUED (BF)

AND ROOM SEALED FANNED FLUE (RSF)

APPLIANCES

These are room sealed appliances that do not require air for

combustion from the room. However 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 separat-

ed 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 re-adjusted.

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. Your British Gas Engineer, or any service engineer will advise

you on suitable frost precautions. For short periods leave the appli-

ance on a low temperature setting.

SERVICE

Annual servicing is important in order to ensure continuing high

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

culty in making suitable servicing arrangements, Worcester Heat

Systems Limited, your British Gas Engineer or other competent per-

sons will discuss regular servicing arrangements and offer a compre-

hensive 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 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.

The appliance is fitted with a blanking panel or an electronic

programmer on the facia panel for the control of domestic hot water

and central heating.

OPERATING MODES

HOT WATER ONLY. The appliance will operate at any time

there is a demand for hot water. Heating temperature control at OFF

(fully anti-clockwise).

OFF. Both hot water and central heating will remain off when

the heating and hot water temperature controls are at OFF (fully anti-

clockwise).

HEATING AND HOT WATER. Hot water will be supplied when a

demand is made. Heating and hot water temperature control at OFF

(fully anti-clockwise).

Central heating will operate continuously in response to a

demand from a room thermostat or thermostatic radiator valves if fit-

ted.

HEATING ONLY. Hot water temperature control at OFF (fully

anti-clockwise). The appliance will operate in response to a demand

from a room thermostat or thermostatic radiator valve, if fitted.

ELECTRONIC PROGRAMMER

Your Installer may have mounted the optional electronic pro-

grammer on the appliance facia panel. Operating instructions are sup-

plied with the programmer.

TEMPERATURE CONTROLS

The Heating Temperature Control gives control over the temper-

ature of water supplied to the radiators when the boiler is serving the

central heating system. This control does not influence the tempera-

ture of the Hot Water which is set by the Hot Water Temperature

Control. The controls have a range as indicated in Fig. 2.

The operating temperatures may be set anywhere within the

range. With a high central heating temperature setting the radiators

will get hotter and high room temperatures will be achievable.

Similarly the temperature of the hot water can be controlled. With

lower settings the radiators and hot water will be cooler but in winter

conditions the central heating and hot water may not reach their

design temperatures.

The temperature controls will shut down the relevant operating

mode when turned fully anti-clockwise.

The Heating Temperature Control is also used to reset any safety

lock-outs by turning it OFF and ON.

WARNING: Do not attempt to adjust any sealed components on

the appliance.

Any interference with sealed components may cause a danger-

ous condition.

OPERATION OF CON-

TROLS

Fig. 2. Facia panel.

Heating Temperature Control

Minimum setting

Maximum setting

Optional Facia Mounted Programmer

Power Light

CH ON Light

OFF

HW ON Light

Hot Water Temperature Control

TO LIGHT THE APPLIANCE

See Figs 2 and 3.

Set the temperature controls A,B (or programmer Cif fitted) to

OFF. Switch off the electricity supply. Remove the cabinet front panel

by lifting off its mountings. Turn the gas service cock Don. Check

that the red needle on the pressure gauge is not below the required

pressure (sealed systems only) usually 1-1.5 bar.

Switch on the mains electricity indicated by the Power light E.

Turn the heating temperature control Bto max. Set each channel

of the programmer C(if fitted) to ON and the burner will light (not

visible).

Set the programmer (if fitted) to the required position.

Set the temperature controls to the desired settings.

Set the room thermostat, if fitted, to the desired temperature.

Set the central heating temperature control Bto the required position.

TO STOP THE APPLI-

ANCE

For Short Periods; Set the temper-

ature controls (or programmer) to OFF

as indicated by the Demand lights F,G

going out.

For Long Periods; Set the temper-

ature controls (or programmer) to OFF

as indicated by the Demand light

going out. Switch off the mains elec-

tricity indicated by the Power light E

going out.

The facia mounted programmer

will retain its settings for about 4

weeks after which it will return to the

factory set programme. The display

will disappear after approx. 12 hours.

ELECTRICITY SUPPLY

FAILURE

The appliance will not operate

without an electricity supply. Normal

operation of the appliance will resume

after the electricity supply is restored.

TO LIGHT AND STOP THE

APPLIANCE

Fig. 3. Appliance with cabinet front cover removed

Circulating

pump

Expansion

vessel

Heatbank

Water

diverter

valve

Pressure

gauge

Gas serv-

ice cock D

CEF G

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