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Electrical connection
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 mm
▶ All 24 VAC connections in the boiler must be established using a 2-
wire power cable with 0.4 – 0.8 mm
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 (§ 16.1, p. 47).
18
1.
0010034327-001
2
2
or NYM-J 3 x 1.5 mm
.
2
cross-section.
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].
1
2.
Fig. 22 Opening the top cover
Condens 7000 WP – 6721842519 (2022/03)
6 720 614 366-24.1I
0010033907-002
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