System Layout 4 - Viessmann B2HB 45 Installation Instructions Manual

Boiler Connections

System Layout 4

Vitodens 200-W, B2HB with...
- DHW storage tank
- one direct-connected heating circuit
- one heating circuit with a mixing valve
Legend
A Vitodens 200-W B2HB boiler with
Vitotronic 200, HO1B outdoor reset
control
Outdoor temperature sensor !
B
Vitotrol remote (optional)
C
D Under floor heating circuit
Radiator heating circuit
E
F Heating circuit pump
G Mixing valve temperature sensor ?
Accessory kit for heating circuit with mixing valve
H
I Domestic hot water storage tank
DHW tank temperature sensor %
J
Expansion tank
K
L Temperature and pressure relief valve
Pressure relief valve
M
N DHW recirculation pump
O Boiler pump
20
DHW circulating pump sA
P
* Function based on coding of address 33
IMPORTANT
DHW circulating pump P must pump into the Vitodens
200-W B2HB boiler (as illustrated).
36
*
28/20
Vitodens 200-W B2HB 45, 57 Installation
Installation of different heating circuits...
radiator heating circuit (high-temp. circuit)
■
under floor heating circuit with 3-way mixing valve
■
(low-temp. circuit)
DHW production
■
... with the following flow conditions:
1. The water flow rate (output) of the radiator heating
circuit is at least 30% greater than that of the under
floor heating circuit.
2. The total flow rate of the two heating circuits is
less than the maximum possible water flow rate of
the Vitodens 200-W B2HB boiler (see page 31 for
max. water flow rate).
The use of a low-loss header is strongly
recommended if the maximum water flow rate in the
application concerned exceeds the values shown on
page 31, or if the system flow rates are unknown.
The low-loss header is available as accessory part.
See following pages for additional installation examples
with a low-loss header.
The 3-way mixing valve, built-in to achieve the low-
temperature level of the under floor heating circuit, is
controlled by an accessory kit for a heating circuit with
mixing valve.