System Layout 3 - Viessmann VITODENS 200-W Installation Instructions Manual

Boiler Connections

System Layout 3

Vitodens 200-W, B2HA with...
- DHW storage tank
- one heating circuit with mixing valve and system separation
Legend
A Vitodens 200-W B2HA boiler with
Vitotronic 200, HO1B outdoor reset
control
Outdoor temperature !
B
Vitotrol remote (optional)
C
D Underfloor heating circuit
Mixing valve temperature sensor ?
E
F Pressure relief valve
G Plate heat exchanger for system
separation
H Accessory kit for heating circuit with
mixing valve
DHW circulating pump sA
I
J DHW storage tank
DHW tank temperature sensor %
K
L Expansion tank
M DHW recirculation pump
Temperature and pressure relief valve
N
O Flow check valve
Heating circuit pump
P
Heating circuit pump
Q
* Function based on coding of address 33
IMPORTANT
DHW circulating pump must pump I into the Vitodens
200-W B2HA boiler (as illustrated).
36
*
28/20
20
Vitodens 200-W B2HA 112, 150 Installation
Installation of ...
underfloor heating circuit with 3-way mixing valve
■
and system separation (low-temp. circuit)
DHW production
■
... with the following flow conditions:
The flow rate of the heating circuit is less than the
maximum possible water flow rate of the Vitodens
200-W B2HA boiler.
See page 30 for maximum water flow rate of the Vitodens
200-W B2HA boilers. The use of a low-loss header is
recommended if the system water flow rate is unknown.
The low-loss header is available as accessory part.
See following pages for installation examples with a
low-loss header.
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 30 for the
supply head pressure drop of the boiler. An undersized
pump may cause short-cycling and/or improper operation
of the boiler. Viessmann STRONGLY recommends using a
low-loss header and a boiler pump in this system layout.