Viessmann B2TB004 Installation Instructions Manual page 37

Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
System Layout 6
Vitodens 222-F, B2TB with...
- Integrated DHW production
- one direct-connected heating circuit
- one heating circuit with system separation
Legend
Vitodens 222-F B2TB boiler with
A
Vitotronic 200, HO1B outdoor reset control
B Outdoor temperature sensor !
Vitotrol remote (optional)
C
D Under floor heating circuit
E Mixing valve temperature sensor ?
Accessory kit for heating circuit with mixing valve
F
G Heating circuit pumps
DHW storage tank
H
Integral expansion tank
I
J Pressure relief valve outlet
Temperature and pressure relief valve outlet
K
L Radiator heating circuit
M Boiler pump
20
DHW circulating pump sA
N
O Plate exchanger for system separation
DCW inlet
P
DHW outlet
Q
R Expansion tank
Installation of different heating circuits...
two heating circuits with 3-way mixing valve
■
(low-temp. circuit)
DHW production
■
... with the following flow conditions:
The total flow rate of the two heating circuits is greater
than the maximum possible water flow rate of the
Vitodens 222-F B2TB boiler (see page 30 for maximum
water flow rate of boiler).
The use of a low-loss header is strongly recommended.
The low-loss header is available as accessory part.
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
a mixing valve.
Installation Examples
37