Bosch GREENSTAR II HE OIL 12/22 Service Manual download pdf (Page 13)

9.1 The appliance is suitable for connection to all conventional indi-

rect hot water systems utilising an indirect double feed cylinder.

9.2 The flow and return connections are located at the rear of

the appliance.

9.3 There is no requirement for a system bypass.

9.4 The pressure jet burner fitted to the appliance has full

automatic control and hence there is no requirement for heat

leak radiators.

9.5 The primary system should be flushed and treated in

accordance with the recommendations of BS 7593:1992 before

the system is handed over to the user.

9.6 The pump should be set in accordance with the heating load

requirements to give a flow and return differential temperature

of 11°C under full load conditions.

Open Vent Primary System.

(See Fig.17).

The following points are for guidance only. The system

installation should be carried out in accordance with BS 5449:

Part 1.

System Pipework

The first metre of pipework from all appliance connections must

be in copper; afterwards copper or plastic pipe can be used. The

plastic pipe must be manufactured to BS 7291 and installed to

BS 5955 part 8. It is important to protect the system

components; the plastic pipe specified must be resistant to the

ingress of oxygen.

2. Feed and Expansion System

The feed and expansion pipes must rise continuously from the

appliance and must be of the minimum diameter shown in Fig 17.

The cistern must be arranged to provide a minimum static head

of 1 metre above the top of the highest point in the heating

circuit.

3. Filling and Venting

Air in the appliance is expelled through the vent pipe or

dissipated into the system. Manual air vents should be fitted at

any high points in the system.

There is a connection on the appliance for connecting an auto

air vent.

Sealed Primary System

The appliance is supplied with a manual reset thermostat and is

suitable for use with a sealed primary system.

General

The system should be installed in compliance with the

9. Heating and Hot Water System

Fig. 19. System filling and make-up

Heating

return

Non return

valve

Stop

cock

Auto air

vent

Fill point.

Heating return

30mm (12in) min.

above highest

point of the system

Make up

vessel

Method 1 Method 2

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 27 28

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Bosch GREENSTAR II HE OIL 12/22 Service Manual Page 13

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