Hydraulic Connection; Installation Examples - Viessmann VITOCROSSAL 300 Technical Data Manual

Vitocrossal 300 CU3A 26 to 57 Technical Data

Hydraulic Connection

Installation Examples

System design
Viessmann condensing boilers can generally be installed
in any pumped hot water heating system (closed system).
Minimum system pressure 14 psi.
The boiler water temperature is limited to 194ºF (90ºC).
To minimise distribution losses, we recommend that
you size the heat distribution system to a max. supply
temperature of 158ºF (70ºC).
For apartments with less than 860 ft
space or for low energy houses with low heat demand
we recommend, due to the immediate capturing of the
room-influencing factors, the utilisation of the Vitocrossal
300 CU3A with a constant temperature control unit in
conjunction with the Vitotrol 200A / 300A.
To reduce burner cycling in low energy houses with a
correspondingly low heat demand, we recommend the
use of a low loss header.
Please note that in the following piping layout examples
all pumps external to the boiler are field supplied.
IMPORTANT
The examples on the following pages depict possible
piping layouts of the Vitocrossal 300 CU3A boiler
equipped with Viessmann System Technology.
Please note that the following examples are simplified
conceptual drawings only!
Piping and necessary componentry must be field verified.
A low water cut-off (LWCO) must be installed where
required by local codes.
Proper installation and functionality in the field is the
responsibility of the heating contractor.
Installation
2 (80 m 2) living
19