E

C

D

A

B

FILLING THE SYSTEM

1Turn on the water main and open the system valves.

2Open all radiator valves.

3Fill the system via a WRAS approved filling loop to 1 bar then turn the valve anti-clock- wise to close.

4Vent (A) any air from the boiler heat exchanger using a suitable container to collect any water. Ensure tube outlet (B) is directed away from the fan or any other electrical component to prevent any water damage. Also place a suitable cover over the fan to prevent any spillage of water

on to electrical connections. Ensure the cover is removed after venting.

5Vent all radiators, retighten when completed and check the system and correct any leaks.

The boiler integral expansion vessel is pre- charged to 0.75 bar (equal to a static head of 7.5m (22ft). A Schraeder type valve is fitted to the expansion vessel to allow for pressure adjustment if required.

If an extra expansion vessel is fitted to the central heating return, adjust this to the same pressure as the appliance internal expansion vessel, refer to separate instruc- tions with the extra expansion vessel.

6Briefly open the pressure relief valve to test its operation.

7If required increase system pressure back to 1 bar.

8Rotate the adjustable pointer on the pressure gauge to record the set system pressure.

9Isolate and remove filling loop connection to system or if using the optional integral filling connection (C) (not supplied with the boiler) remove key (D) and place in

its storage position (E) on the bottom cover of the boiler.

A pre-filling kit 7 716 192 282 is available for installations where the boiler will not be fitted immediately to the heating system. This allows the heating system and mains water connections to be filled and checked prior to boiler installation.

This kit can be used in conjunction with the optional filling loop 7 716 192 281(not sup- plied with the boiler).

COMMISSIONING

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

FILLING THE SYSTEM

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Bosch Appliances 24i junior, 28i junior manual Filling the System

28i junior, 24i junior specifications

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