Opening The Control Unit; Check Power Supply Connection - Viessmann Vitocrossal 300 Series Service Instructions Manual

Start-up

Opening the Control Unit

Legend
A Top part of control unit with programming unit
B Push button for changing the angle
C On/off switch

Check Power Supply Connection

12
Vitocrossal 300 CU3A 26 to 199 Service
Vitotronic 200, type KW6B
1. Lift the programming unit A into the upright position
(the angle of the programming unit can be adjusted
using the push button on the side B).
2. Open the control cover and turn the boiler on by
switching the on/off switch C.
An external accessories connection modules are
integrated into the Vitocrossal 300 CU3A boiler, which
requires a 120VAC power supply from a wall receptacle
(15A fuse protected).
Refer to the Installation Instructions shipped with the
boiler.
Voltage range
The voltage at connector 40 of the boiler control must be
120V (see wiring diagram).
Neutral conductor
The electrical power supply must have a neutral conductor.
IMPORTANT
In Canada all electrical wiring is to be done in accordance
with the latest edition of CSA C22.1 Part 1 and/or local
codes. In the U.S. use the National Electrical Code ANSI/
NFPA 70. The heating contractor must also comply with
both the Standard for Controls and Safety Devices for
Automatically Fired Boilers, ANSI/ASME CSD-1.
Note: The line conductor "L " and the neutral conductor
"N" must not be interchanged.
See wiring diagram on page 101 in section entitled
"Additional Information".