Bosch Greenstar 12i Service Manual download pdf (Page 14)

PRE-INSTALLATION

6 720 644 743b (2011/08)

EXISTING BUILDS: S AND Y PLAN SYSTEMS:

S PLAN LAYOUT

Fig. 6 Existing build - S Plan

Y PLAN LAYOUT

WITH EXTERNAL DIVERTER VALVE

Fig. 7 Existing build - Y Plan external diverter valve

OPTIONAL DIVERTER VALVE

This boiler is designed to operate on a sealed system

only. The boiler will require a second return pipe from

the water cylinder to the wall mounting frame and

terminate in 15mm copper pipe.

EXISTING BUILD - SYSTEM LAYOUT

WITH OPTIONAL INTERNAL DIVERTER VALVE

(NOT SUPPLIED WITH BOILER)

Fig. 8 Existing build - Internal diverter valve

NEW BUILD - TWO ZONED HEATING SYSTEM

The latest Part L1a regulation for new installations

require separate zone controls for the central heating.

Fig. 9 New build - System layout

NOTICE: The boiler is fitted with its own

internal bypass.

1 Diverter/Zone valve

2 Radiator valve (flow)

3 Lock shield valve (return)

4Bypass

Tab. 10

NOTICE:

B A drain cock should be fitted at the

lowest point of the heating circuit and

beneath the appliance.

6720644743-05.1Wo

6720644743-06.1Wo

Boiler flow

Cylinder return

Heating return

)

6720644743-07.1Wo

6720644743-42.1Wo

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Bosch Greenstar 12i Service Manual Page 14