Bosch ZSB 30-2 A Operations Instructions download pdf (Page 30)

30 | Installation

6 720 644 143 (2010/09)

Fitting the filling loop (ZWB)

B Close the isolating valves on the mains water inlet [9]

and the CH return [1] connections.

B Remove the blanking plugs [2].

B Place the filter [7] into the inlet side of the filling loop

[4] ensuring that the filter mesh faces into the filling

loop.

B Fit the filling loop [4] to the mains water inlet [9] and

CH return [1] connections. Ensure that the filling loop

is completely pushed into the stop tabs [6, 3] on both

sides of the filling loop.

B Fit two screws and washers [8] to each of the two

connections [9] and [1]. Do not try to turn the brass

hexagon connectors.

Fig. 23

Filling the heating circuit (ZWB)

B Ensure that all system and boiler drain points are

closed.

B Tigthen screw [1] on the filling loop as far as it will go

(Æ Fig. 24).

B Open the cold water supply tap [3] and heating return

tap [2].

B Insert key [4] in the filling direction so the arrow

points to symbol .

B Turn key [4] to position .

B Fully undo screw [1] on the filling loop and fill the

heating circuit to a pressure of 1 - 2 bar.

Fig. 24

B After filling, turn in screw [1] as far as it will go.

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Bosch ZSB 30-2 A Operations Instructions Page 30