Mains Supply

Bosch Appliances 28i junior, 24i junior manual Mains Supply

INSTALLATION

PRE -

MAINS WATER EXPANSION VESSEL:

A - Mini expansion vessel, part No. 7 716 102 105

B - Mains water inlet
C - Non-return valve
D - Boiler		D
	A
B	C

ELECTRIC SUPPLY:

•Supply: 230V - 50Hz, 140 watts

•Cable: PVC insulated 0.75mm2 (24 x 0.2mm) temperature rated to 90°C.

•External 3A fuse to BS1362.

•The appliance must be earthed.

•IPX4D. NOTE: this is reduced to IP20 if the following mechanical timers are fitted:

7 716 192 036 or 7 716 192 037.

•All pipes to the boiler must be cross-bonded.

•Wiring must comply with IEE wiring regulations.

GAS SUPPLY:

•Boilers using NG must be connected to a governed meter.

•LPG boilers must be connected to a regulator.

•Installation and connection of the gas supply to the boiler must be in accordance with BS6891.

•Under no circumstances should the size of the gas supply pipe be less than that of the appliance inlet connection.

•The meter or regulator and pipework to the meter must be checked, preferably by the gas supplier, to ensure it is in good working order and can meet the gas flow and pressure requirements in addition to the demand from any other appliance being served.

WATER SUPPLY:

Water mains pressure:

•Minimum mains water pressure 1.3 bar for maximum performance.

•Maximum mains fed water pressure 10 bar. If necessary, fit a pressure reducing valve.

IMPORTANT: Non-return, back flow pre- vention devices (including those associ- ated with water meters) fitted to the mains water supply can cause a pres- sure build up which could damage the boiler and other household appliances.

•Where the mains water supply has a non- return, back flow prevention valve fitted, a mini expansion vessel (A) should be connect- ed to the mains water inlet pipe (B) between the non-return valve (C) and the boiler (D) as shown opposite.

Use in hard water areas:

Normally there is no need for water treatment to prevent scale formation as the maximum tem- perature of the DHW heat exchanger is limited in the electronic circuit.

In areas where temporary water hardness exceeds 200ppm, consideration may need to be given to the fitting of a scale prevention device. In such circumstances, the advice of the local water authority should be sought.

MAINS SUPPLY

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior 8 716 107 336b (11/05)

28i junior, 24i junior specifications

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