Bedienungsanleitung Bosch Condens GC7000WP (Seite 18 von 52) (Englisch)

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Electrical connection

Condens 7000 WP – 6721841195 (2022/01)

6.10 Connecting an expansion vessel

For the boiler and the system to function correctly, the right expansion

vessel must be selected.

▶ Determine the size and pre-charge pressure of the expansion vessel

by referring to EN 12828.

▶ Remove the cap from the connection point [1].

▶ Connect the connecting pipework of the expansion vessel to the

connection point.

Fig. 20 Connecting an expansion vessel

6.11 Installing the insulation (accessory)

Insulating parts are available for the connection set of this boiler.

If the boiler is placed on the base frame, the insulation consists of

several panels. In the case of wall-mounted installation, the insulation

consists of 1 piece which is fastened underneath the boiler.

▶ For more information, refer to worcester-bosch.co.uk or you will find

the relevant addresses on the rear of this document.

7 Electrical connection

CAUTION

Electric shock.

▶ Disconnect the boiler from the power supply before working on

electrical parts.

NOTICE

Electrical short circuit due to incorrect cabling.

▶ Only use original cables if they need to be replaced.

▶All 230 VAC connections in the boiler must be established using the

cable type H05VV-F 3 x 0.75 mm2 or NYM-J 3 x 1.5 mm2.

▶All 24 VAC connections in the boiler must be established using a 2-

wire power cable with 0.4 – 0.8 mm2 cross-section.

It must be possible to reach mains plug and therefore also the socket

(230 V AC, 50 Hz) at all times for commissioning of the boiler. The

socket must be earthed.

▶ When establishing the electrical connection, also refer to the

documentation of the accessory to be connected and the wiring

diagram (§ 15.1, p. 46).

7.1 Handling printed circuit boards

Printed circuit boards with control electronics are very sensitive to

electrostatic discharge (ESD). To prevent damage to the components,

exercise utmost caution.

CAUTION

Damage due to electrostatic charge!

▶ Wear an earthed wristband when handling unenclosed PCBs.

Fig. 21 Wrist strap

The damage is not normally immediately apparent. A PCB may function

perfectly during commissioning and problems often only arise later on.

Charged objects are only a problem if they are in the vicinity of the

electronics. Before starting work, ensure a safe distance of at least 1 m

from foam rubber, protective film and other packaging materials,

clothing made of synthetic fibres (e.g. fleece pullovers) and similar

items.

An earthed wrist strap offers good ESD protection when working with

electronics. This wrist strap must be worn when opening the screened

metallic bag/packaging or prior to exposing a fitted PCB. The wrist strap

must be worn until the PCB has been placed inside its screened

packaging or has been connected inside the closed control cabinet.

Replaced PCBs that are returned must be handled in this way.

7.2 Opening the top cover

The burner control unit and terminal strip for electrical components are

located under the top cover.

▶ Open the top cover by unfastening the retaining screws [1].

Fig. 22 Opening the top cover

0010034327-001

6 720 614 366-24.1I

0010033907-002

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