Making The Electrical Connections; General Notes; Low Voltage Electrical Connections In The Heatronic Boiler Control; Open The Heatronic Boiler Control - Bosch ZBR16-3A Installation And Service Instructions Manual

52 | Making the electrical connections

6 Making the electrical connections
6.1

General notes

DANGER: Risk of electric shock!
B 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.
B It is not sufficient to simply shut off the
controls.
B 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 18).
Replacement fuses can be found on the back
of the cover ( Fig. 36).
Controls and modules
For installation and electrical connection of controls and
modules, see the installation instructions of the accessory.
6 720 643 068 (2011/06)
6.2 Low voltage electrical connections in
the Heatronic boiler control
6.2.1

Open the Heatronic boiler control

NOTICE: Small pieces of wire can cause
shorts and damage the electronics.
B Always strip cables away from electronics.
B Unhook the clip (step 1) and fold the Heatronic down
(step 2).
Fig. 35 Fold the Heatronic down
B Remove screws (step 1), unhook cable and remove
cover (step 2).
1
Fig. 36 Remove the cover
1
2
6 720 641 933-72.1O
1
2
1
6 720 641 933-86.1O
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