Viessmann Vitocrossal 300 CU3A 26 Installation Instructions Manual page 36

Control Connections
Connections
(continued)
36
Vitocrossal 300 CU3A 26 to 199 Installation
Connection to boiler
Pump output assignment is done using the start-up
wizard.
A maximum of 2 zone circuit pumps can be connected to
the boiler additional pumps will require the use of an AM1
extension module.
Refer to the AM1 extension module Installation
Instructions for additional details.
Connection at AM1 (accessory)
Pump output assignment is done using the start-up
wizard.
Refer to the boiler Service Instructions for
start-up instructions.