VIESSMANN VITOCROSSAL 300 CU3A Gas Condensing Boiler User Guide
- October 27, 2023
- VIESSMANN
Table of Contents
- VIESSMANN VITOCROSSAL 300 CU3A Gas Condensing Boiler
- Before wiring the boiler
- What you need to know about wiring the boiler
- Access to the CU3A Wiring
- Power and Sensor Connection
- Heating Circuits Connection
- DHW Connection
- External Heat Demand Connection
- References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
VIESSMANN VITOCROSSAL 300 CU3A Gas Condensing Boiler
This Quick Start Guide is designed to provide an overview to an experienced licensed professional heating contractor with the a general wiring and operational knowledge of the Vitocrossal 300 CU3A boiler. It is NOT a substitute for the technical support literature supplied with the Vitocrossal 300 CU3A boiler and its accessories. The technical support literature of each product contains the necessary safety and national/local code requirements which, if not followed exactly, will lead to property damages, personal injuries and/or loss of life. Viessmann Manufacturing assumes no responsibility for damage(s) of any kind caused by inappropriate use of this Quick Start-up Guide and/or failure to read the technical literature provided
Before wiring the boiler
- Connect fuel supply and all hydronic piping.
- Ensure gas pressure matches rating plate.
- Verify that the venting is installed according to the Installation Instructions.
- Perform leak tests on the gas supply, heating system and venting, using approved methods.
What you need to know about wiring the boiler
- For detailed installation information of the Vitocrossal 300 CU3A boiler refer to the appropriate documentation.
- Refer to boiler wiring diagram for electrical requirements of boiler.
- 120VAC wiring! The boiler can only be connected to a 120/1/60 power supply.
- Proper polarity must be maintained for 120VAC wiring.
- The control unit requires an earth ground for proper operation.
- Use shielded wire for sensor wiring to prevent electromagnetic interference.
Access to the CU3A Wiring
Power and Sensor Connection
Heating Circuits Connection
with mixing valve extension module (max. 2)
DHW Connection
External Heat Demand Connection
References
- Home | Centrotherm
- Home - DuraVent
- ENERVEX - Mechanical Draft, Venting & Heat Recovery welcome...
- ICC-RSF
- Novaflex Group - Novaflex
- Selkirk
- Van-Packer – A Leader in the Chimney & Exhausting Industry
- wesmechtech.com