Worcester 26CDi Xtra Manual de Serviço descarregar pdf (Página 3)

2.6 GAS SUPPLY

Check the data plate (located on the inner cover of the appliance)

to ensure the appliance has been set up for the correct gas

supply. The appliance can be set up for either of the following

gases: Natural gas (G20) or propane (G31).

A conversion kit including instructions is available to change

the appliance from one gas to the other.

The boiler requires 2.7m

/h (95.3ft

/hr) of natural (G20) or

1.03m

/hr (40ft

/hr) of propane gas (G31) The gas meter and

supply pipes must be capable of supplying this quantity of gas

in addition to the demands of any other appliances being served.

The meter governor should deliver a dynamic pressure of

20mbar (8in wg) for natural gas or 37mbar (14.4 in wg) for

propane.

The complete installation, including the gas meter, must be

tested for soundness and purged. Refer to BS 6891.

2.7 CONDENSATE DRAIN

A condensate drain is provided on the appliance. This drain must

be connected to a drainage point on site. All pipework and

fittings in the condensate drainage system must be made of

plastic. NO OTHER MATERIALS SHALL BE USED.

The drain outlet on the appliance is 22mm/

in plastic.

See fig. 3.

2.8 PACKING

The appliance and flue components are packed in separate

cartons.

2.9 GENERAL INSTALLATION

The appliance is for connection to a sealed primary system only.

The 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 5440:2:1989.

Notwithstanding the instructions given in BS 5440:2:1989, 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. See fig. 2.

2.10 FLUE

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

The Standard Flue assembly length is from 100mm to 1000mm.

The alternative Extended Flue assembly is available, for flue

lengths up to 2000mm Iong.

The flue system inclines 2

° (44mm per metre length)

towards the appliance, to prevent condensate dripping from the

flue terminal.

NB: A white plume of condensate will be emitted from the

flue terminal when the appliance is operating. Refer to

Section 4 “Siting the appliance.”

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 internal fixing of the flue is also available, as an optional extra.

2.11 CONTROLS

The electronic control system and gas valve modulate the heat

input in response to the central heating and domestic hot water

temperature settings between minimum and maximum.

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

the appliance.

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 taps.

A choice of facia mounted programmers is available as an

optional extra. 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.

Frost Protection

The boiler is fitted with an internal frost thermostat which will

protect the boiler from frost damage, as long as the mains switch

on the boiler is in the on position. However, if frost protection is

necessary for the system, please contact The Worcester Technical

Helpline. Tel: 0990 266241.

Thermostatic radiator valves can be used in the system.

The appliance incorporates an adjustable by-pass between the

central heating flow and return.

2.12 SYSTEM NOTES

WARNING: CHECK THAT NO DIRT IS LEFT IN EITHER THE

GAS OR WATER PIPEWORK AS THIS COULD CAUSE DAMAGE TO

THE APPLIANCE. THOROUGHLY FLUSH THE HEATING SYSTEM,

AND THE MAINS WATER SUPPLY IN ACCORDANCE WITH THE

RECOMMENDATIONS OF BS 7593 :1992.

NB: AN INLET WATER FILTER IS FITTED INTO THE MAINS COLD

WATER INLET ON THE APPLIANCE. CHECK THE FILTER IS FITTED

WHEN THE APPLIANCE IS INSTALLED. SEE FIG. 18.

REFER TO SECTION 10 “INSTALLATION,” AND 10.2 “GENERAL

FITTING.” SEE FIG. 16 .

PURGE THE GAS SUPPLY BEFORE FINALLY CONNECTING THE APPLIANCE.

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 current requirements of BS 2767:10.

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.

Fig. 1. Appliance water flow diagram.

Automatic

Air Vent

Circulating

Pump

Water to Water

Heat Exchanger

Water Diverter

Valve

CH Flow

Domestic

Hot Water

Out

Domestic

Cold Supply

CH Return

Safety

Relief

Condensate

Drain

Pressure

Relief

Valve

Expansion

Vessel

Gas to Water

Heat Exachanger

Secondary

High

Efficiency

Heat

Exchanger

Boiler

Central Heating

By-pass

Adjustment

1 2 3 4 5 6 7 8 ... 49 50

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