Viessmann B2TB004 Installation Instructions Manual page 35

Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
System Layout 4
Vitodens 222-F, B2TB with...
- Integrated DHW production
- one direct-connected heating circuit
- one heating circuit with a mixing valve
Legend
A Vitodens 222-F B2TB boiler with
Vitotronic 200, HO1B outdoor reset
control
B Outdoor temperature sensor !
Vitotrol remote (optional)
C
D Under floor heating circuit
E Radiator heating circuit
Heating circuit pump
F
G Mixing valve temperature sensor ?
Accessory kit for heating circuit with mixing valve
H
Domestic hot water storage tank
I
J Integral expansion tank
Temperature and pressure relief valve outlet
K
L Pressure relief valve outlet
M DHW circulating pump sA
Boiler pump
N
20
O Low-loss header
Low-loss header sensor ?
P
DCW inlet
Q
R DHW outlet
28/20
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 222-F B2TB boiler (see page 30 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 30, or if the system flow rates are unknown.
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
mixing valve.
Installation Examples
35