NE2.0
9 6721821040 (2020/01)
div
Bosch Thermotechnik GmbH – Sophienstraße 30-32 – D-35576 Wetzlar
Safety precautions
▶ Electrical work may only be carried out by a qualified
electrician.
▶ Carry out electrical work in accordance with the
standards and local regulations which apply.
▶ Install the connection so that it is fixed and has the
correct phase sequence.
▶ Ensure that the total current does not exceed the value
stated on the data plate.
▶ Observe documents and connection diagrams of the
installed components.
▶ Ensure that an emergency stop device (heating system
emergency stop switch) is installed in accordance with
the regulations of the relevant country.
▶ In systems equipped with with three-phase current
consumers, the emergency stop device must be
integrated into the safety chain.
▶ Ensure that a standard-compliant circuit breaker and in
accordance with EN DIN 60335 is installed for all-pole
disconnection from the mains power supply. If there is
no circuit breaker, you will need to install one.
▶ Before opening the device, disconnect all poles of the
heating system via the circuit breaker. Secure against
unintentional reconnection.
▶ Size the cables according to the ambient conditions and
installation method.
▶ Do not use the green/yellow (gn/ge) protective
conductor as a control cable.
▶ Group and fasten together all common cables (e.g. with
cable ties) or strip the cable sheath short, to prevent the
risk of voltage flashes between 230 V and extra-low
voltage cables due to a wire accidentally coming loose
at the terminals.
▶ Observe the safety instructions in the documentation of
the control unit and the modules used.
▶ Integrate contact of the overfilling safety device into the
safety chain or interlock of the heat source.
▶ In the case of three-phase current consumers
(e.g. burners, boiler circulation pumps), appropriate
on-site switching devices must be connected upstream
of the current consumers and fuse-protected.
▶ Observe the legend in this document!
Remark
The schematic diagrams show non-binding examples for the
connection to a control unit or a heat source.
▶ Observe local conditions and regulations.
Connection to the external interlock terminals of a heat source is not
permitted!
Wiring diagram A
Terminals with control units with SI terminal
[1]
Optional equipment pressure booster
[2]
Volt free relay contacts for external fault display
[3]
Contact for fault display
[4]
Contact for granulate used up indicator
[5]
Power supply wiring
[6]
Burner shutdown contact
Neutralisation NE2.0
Current consumption: 1.7 A
Current consumption with pressure booster: 3.3 A
Wiring diagram B
Connection to other makes of boiler
[1]
Optional equipment pressure booster
[2]
Volt free relay contacts
[3]
Contact for fault display
[4]
Contact for granulate used up indicator
[5]
Power supply wiring
[6]
Burner shutdown contact
[7]
Mains power supply (230 V AC, 50 Hz,
maximum permissible fuse protection 10 A)
[8]
Burner shutdown contact (isolate, if not connected)
▶ Observe boiler documents.
Neutralisation NE2.0
Current consumption: 1.7 A
Current consumption with pressure booster: 3.3 A
Legend
Colour abbreviations
Table 3
Colour abbreviations
Connection
German abbreviation
Colour
sw
Black
br
Brown
rt
Red
or
Orange
ge
Yellow
gn
Green
bl
Blue
vi
Purple
gr
Gray
ws
White
rs
Pink
tk
Turquoise
gn/ge
Green-Yellow
