Bosch 15SBI Service Manual download pdf (Page 3)

2.7 System

All dirt must be flushed from the system before connecting the

appliance. Refer to Fig. 5,6 and 7.

The system can be pre-piped and flushed before the appliance is

fitted.

The connections in the system must withstand a pressure of up

to 3 bar.

Radiator valves must conform to BS2767:10:1977.

2.8 Domestic Hot Water

Single feed direct cylinders are not suitable and must not be

used.

A HW cylinder must be of the indirect coil type and suitable for

working at a gauge pressure of, at least, 0.35bar above the relief

valve setting.

Where a storage system will not have a vent to atmosphere the

installation must comply with Building Regulations and Water

Company bye-laws. If connecting to an existing system the local

authority should be informed.

2.9 Safety

The appliance must not be operated with the inner casing cover

removed.

The gas and electricity supplies must be turned off before

servicing or working on the appliance.

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.

2.10 Operation

Central Heating

A demand for heat will ignite the burner. The temperature is

controlled by the integral sensor. At the end of the demand the

burner will go out and the pump will continue to run for up to 3

minutes to dissipate the heat.

Domestic Hot Water:

The supply of domestic hot water depends upon the type of hot

water equipment installed and the control system. Refer to the

separate leaflet.

The use of unvented cylinders must be in accordance with the

manufacturers instructions relevant to British Standards

Gas to water heat

exchanger

Automatic air vent

Optional diverter valve

Expansion vessel

Pump

Fig. 1. Water flow diagram.

Combustion

Chamber

Return

Cold in

C.H.

flow

By-pass

Relief

valve

discharge

Cylinder

flow

(with optional

diverter valve

only)

1 2 3 4 5 6 7 8 ... 36 37

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Bosch 15SBI Service Manual Page 3

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