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Electrical connection
7
Electrical connection
7.1
General notes
DANGER:
Risk of electric shock!
▶ Before working on the power supply (120 VAC), disconnect the
boiler from the grid by shutting off the emergency shutoff switch or
disengaging the heating system circuit breaker. Take measures to
prevent accidental reconnection.
▶ It is not sufficient to simply shut off the controls.
▶ Observe all applicable electrical codes and regulations.
Electrical components must be installed by a trained and certified
electrician and the installation must meet the National Electric Code as
well as all applicable local codes and regulations.
The boiler must be properly electrically grounded in accordance with the
requirements of the authority having jurisdiction or, in the absence of
such requirements with the National Electrical Code, ANSI/NFPA 70
and/or the Canadian Electrical Code Part I, CSA C221.1, Electrical
Code.
Provide a dedicated circuit breaker for the boiler and heating system
rated at least 15A. All line voltage wiring must use at least AWG14 size
cables.
All appliance modulation, control and safety components are tested and
pre-wired for use.
Observe safety precautions and all rules and regulations required by
local code and the National Electric Code.
Fuses
The appliance is protected with a fuse. It is located on the circuit board
( Fig. 8, page 16).
Replacement fuses can be found on the back of the cover ( Fig. 43,
page 44).
Controls and modules
For installation and electrical connection of controls and modules, see
the installation instructions of the accessory.
44
7.2
Low voltage electrical connections in the Heatronic
boiler control
7.2.1
Open the Heatronic boiler control
NOTICE:
Small pieces of wire can cause shorts and damage the electronics.
▶ Always strip cables away from electronics.
▶ Unhook the clip (step 1) and fold the Heatronic down (step 2).
Fig. 42 Fold the Heatronic down
▶ Remove screws (step 1), unhook cable and remove cover (step 2).
1
Fig. 43 Remove the cover
7.2.2
Connecting the BUS-system
Connect only Bosch room controls to the internal BUS of this boiler. For
further details see the technical documentation of the BUS system
components (e. g. CRC200 and CZM100).
B
B
Fig. 44 Electrical wiring BUS-cable at the boiler
1
2
6 720 641 933-72.1O
1
2
1
6 720 641 933-86.1O
6 720 806 992-09.1O
Greenstar – 6721822579 (2020/03)
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