Viessmann B2HB009 Installation Instructions Manual page 35

Vitodens 200-W B2HB 19 to 35, 68 to 125 Installation
System Layout 3
Vitodens 200-W, B2HB with...
- DHW storage tank
- one heating circuit with mixing valve and system separation
Legend
A Vitodens 200-W B2HB boiler with
Vitotronic 200, HO1B outdoor reset
control
B Outdoor temperature sensor !
Vitotrol remote (optional)
C
D Underfloor heating circuit
Mixing valve temperature sensor ?
E
Pressure relief valve
F
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
Expansion tank
L
M DHW recirculation pump
Temperature and pressure relief valve
N
O Flow check valve
P Heating circuit pump
Heating circuit pump
Q
* Function based on coding of address 53
IMPORTANT
DHW circulating pump I must pump into the Vitodens
200-W B2HB boiler (as illustrated).
*
28/20
20
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 B2HB boiler.
See page 30 for maximum water flow rate of the Vitodens
200-W B2HB 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
water flow pressure drop of the boiler heat exchanger.
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.
Boiler Connections
35