Worcester 28CDI Wartungshandbuch PDF herunterladen (Seite 3)

Any specified ventilation openings made into a wall or

compartment door must not be obstructed.

If the appliance is to be fitted into a compartment then the

compartment must conform to the requirements of BS 5440:2.

Notwithstanding the instructions given in BS 5440:2, this appliance

may be fitted in a compartment with no vents as long as the

minimum clearances stated in Section 6: Air Supply, are

maintained.

Do not place anything on top of the appliance.

The clearances specified for servicing must be maintained. Refer to

Fig. 2.

2.6 Flue

The appliance has a multi-directional horizontal fanned flue system.

The standard telescopic flue assembly accommodates flue lengths

from 297mm to 725mm.

Extension flue lengths available are from 726mm up to 4000mm

(24CDi) or up to 3000mm (28CDi and 35CDi II).

A vertical flue assembly kit is available.

Optional 45° and 90° flue bends are available.

A terminal guard, Type K2, GC 393 553, is available from Tower Flue

Components, Vale Rise, Tonbridge,TN9 1TB.

Do not allow the flue terminal fitted to the outside wall to become

obstructed or damaged.

A kit for the internal fixing of the flue is available separately.

2.7 Controls

The ON/OFF switch will turn the mains electricity on and off at the

appliance.

Note: There is still a live connection to the appliance.

The electronic control system and gas valve modulate the heat

input in response to the central heating and domestic hot water

temperature settings.

The Central Heating Temperature control knob provides for the

selection of domestic hot water only (turned fully anti-clockwise) or

central heating and domestic hot water (turned clockwise).

The position of the Domestic Hot Water control knob will determine

the temperature of the water delivered to the tap or shower or

bath.

A choice of facia mounted programmers are available as optional

extras. A remote mounted programmer may be connected to the

appliance.

The integral facia displays indicate the status of the appliance.

There is provision for the connection of a mains voltage room

thermostat and/or a frost thermostat.

The electronic controls prevent rapid cycling of the appliance in the

central heating mode.

2.8 System Notes

IMPORTANT: Check that no dirt is left in the water pipework as

this could cause damage to the appliance. Thoroughly flush the

heating system and the cold water mains supply in accordance

with the recommendations of BS7593: 1992.

Remove all system cleanser before adding any inhibitor.

The water pipe connections throughout a sealed system must be

capable of sustaining a pressure of up to 3 bar.

Radiator valves must conform to the requirements of BS

2767:1991.

The relief valve discharge must be directed away from any electrical

components or where it would cause a hazard to the user.

A drain cock to BS 2879 must be fitted to the lowest point of the

system.

For circuit design purposes it is important that due note is taken of

the information given in Table 3 relating to the available pump

head.

2.9 Showers, Bidets, Taps and Mixing Valves

Hot and cold taps and mixing valves used in the system must be

suitable for operating at the mains pressure.

Thermostatically controlled or pressure equalising shower valves

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

If a pressure equalising valve is used, set the Domestic Hot Water

temperature control knob to the ‘MAX’ position.

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 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 Bosch Technical Helpline.

2.10 Safety Considerations

The appliance must not be operated in a waterless condition.

The appliance must not be operated with the boiler inner casing

cover removed.

Work must not be carried out on the appliance without the gas and

electricity supplies being switched off.

Checks must be made to ensure that, where applicable, the

ventilation openings made into walls and partitions are of the

correct size and are not obstructed.

IMPORTANT: Where back-flow prevention devices, including

water meters, are fitted the expansion of hot water into cold

water main can be prevented. This can result in a pressure

build-up that may cause damage to the boiler and household

devices such as showers, washing machines etc.

In these cases we recommend that a mini-expansion vessel be

fitted adjacent to the boiler in the cold water pipe.

2.11 Operation

Domestic Hot Water: With a demand for hot water the burner will

light at its maximum setting and then automatically adjust its

output to maintain the temperature of the delivered water. When

hot water is no longer required, the burner will extinguish. The fan

and pump may continue to run for a short period to dissipate the

residual heat from the appliance.

Central Heating: With a demand for heating the burner will light at

its minimum setting and gradually increase to give the maximum

output. The output of the appliance is then automatically adjusted

to maintain the temperature of the system. The output can reduce

down to its minimum of setting. If the system no longer requires

even the minimum output to maintain the desired room

temperature the burner will extinguish. The fan and pump may

continue to run to dissipate the residual heat from the appliance.

The appliance will remain off for a fixed period of three minutes

before re-lighting to automatically meet the system requirements.

Domestic Hot Water and Central Heating: The appliance will

supply heat to the central heating system as required. A demand

for domestic hot water at a tap or shower will override the central

heating requirement for the period of the domestic hot water

demand. When hot water is no longer required the appliance will

return to the central heating state and its normal mode of

operation. The fan may continue to run to dissipate the residual

heat from the appliance as necessary.

Fig. 1. Appliance water flow diagram.

Boiler

6 7 8 9 10

1. Automatic air

vent.

2. Gas to water

heat

exchanger.

3. Circulating

pump.

4. Water to water

heat

exchanger.

5. Water

diverting

valve.

6. CH flow.

7. DHW out.

8. Mains cold

water in.

9. CH return

10.Safety

discharge.

11.Central heating

by-pass

adjustment.

12.Pressure relief

valve.

13.Sealed system

expansion

vessel.

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