Viessmann Vitocrossal 300 Series Technical Data Manual page 21

Vitocrossal 300 CU3A 26 to 199 Technical Data
System Layout 2
Vitocrossal 300 CU3A with...
- DHW storage tank
- one heating circuit with mixing valve and system separation
Legend
A Vitocrossal 300 CU3A boiler with
Vitotronic 200, KW6B outdoor reset control
Outdoor temperature !
B
C Vitotrol remote (optional)
Underfloor heating circuit
D
E Mixing valve temperature sensor ?
F Pressure relief valve
Plate heat exchanger for system separation
G
H Accessory kit for heating circuit with mixing valve
DHW circulating pump sA
I
DHW storage tank
J
K DHW tank temperature sensor %
Expansion tank
L
M DHW recirculation pump
N Temperature and pressure relief valve
Heating circuit pump
O
P Heating circuit pump
* Function based on coding of address 53
*
28/20
20
Installation of ...
underfloor heating circuit with 3-way mixing valve
■
and system separation (low-temp. circuit)
DHW production
■
IMPORTANT
System separation is required of underfloor heating
systems employing non-oxygen diffusion barrier tubing.
All components on the secondary side of the heat
exchanger must be made of corrosion-resistant materials.
IMPORTANT
Sizing of field-supplied pump P is critical for proper boiler
operation in this system layout. See page 8 for the supply
head pressure drop of the boiler. An undersized pump
may cause short-cycling and/or improper operation of the
boiler.
Installation Examples
21