for use by heating contractor
Please file in Service Binder
5673 649 - 01 04/2015
VITOCROSSAL 300
Vitocrossal 300
CU3A Series 26 to 57
Floor mounted, gas-fired condensing boiler with MatriX gas burner and Lambda Pro control
For operation with natural gas and liquid propane gas
Heating input 19 to 199 MBH
5.6 to 58 kW
Read and save these instructions
for future reference.
Product may not be exactly as shown
IMPORTANT
H
Please file in Service Binder
5673 650 - 01 04/2015
Operating Instructions
VITOCROSSAL 300
With Vitotronic 200 KW6B Controls
Vitocrossal 300
CU3A Series 26 to 57
Floor mounted, gas-fired condensing boiler with MatriX gas burner and Lambda Pro control
For operation with natural gas and liquid propane gas
Heating input 19 to 199 MBH
5.6 to 58 kW
Read and save these instructions
for future reference.
Product may not be exactly as shown
IMPORTANT
H
Do not store or use gasoline or other
fl ammable liquids in the vicinity of this
or any other appliance.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliances.
Do not touch any electrical switches,
do not use any phone in your building.
Immediately call your gas supplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
If you cannot reach your gas supplier,
call the fi re department.
Installation and service must be
performed by a qualifi ed installer,
service agency or the gas supplier.
If the information in this manual is not followed
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
WARNING
Improper installation, adjustment, and/
or operation could cause carbon monoxide
poisoning resulting in injury or loss of life.
This product must be installed and serviced
by a professional service technician who is
experienced and qualified in hot water boiler
installation and gas combustion.
WARNING
Please file in Service Binder
for use by heating contractor
5673 648 - 01 04/2015
Installation Instructions
Vitocrossal 300
CU3A Series 26 to 57
Floor mounted, gas-fired condensing boiler with MatriX gas burner and Lambda Pro control
For operation with natural gas and liquid propane gas
Heating input 19 to 199 MBH
5.6 to 58 kW
VITOCROSSAL 300
Read and save these instructions
for future reference.
Product may not be exactly as shown
IMPORTANT
H
Please file in Service Binder
5774 472 - 03 04/2015
Mixing Valve
Extension Module
Installation Instructions
for use by heating contractor
Mixing Valve Extension Module
for one heating circuit with mixing valve
Product may not be exactly as shown
Read and save these instructions
for future reference.
IMPORTANT
Certified as a component
part for Viessmann boilers
QUICK START GUIDE
VITOCROSSAL 300, CU3A
UNCOMPROMISE.US
FOR LPG CONVERSION DETAIL, SEE PAGES 14-15
FOR CODINGS, SEE PAGES 57-70
FOR TROUBLESHOOTING AND FAULT CODES, SEE PAGES 75-86
FOR WIRING DIAGRAM, SEE PAGES 94-95
FOR HEATING/DHW PUMP AND SENSOR WIRING, SEE PAGES 24-38
FOR SYSTEM LAYOUT, SEE PAGES 40-48
FOR PROGRAMMING, SEE PAGES 11-33
FOR PUMP AND SENSOR WIRING, SEE PAGE 8
Vitocrossal 300 CU3A Quick Start Guide:
INSTRUCTIONS
UNCOMPROMISE.US
For the latest updates on the Quick Start Guide, please visit
9442120 05 / 2015
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