System Layout 4 - Viessmann VITODENS 222-F Technical Data Manual

Vitodens 222-F, B2TB 19 and 35 Technical Data

System Layout 4

Vitodens 222-F, B2TB with...
- Integrated DHW production
- one direct-connected heating circuit
- one heating circuit with a mixing valve
Legend
Vitodens 222-F B2TB boiler with
A
Vitotronic 200, HO1B outdoor reset control
Outdoor temperature sensor !
B
C Vitotrol remote (optional)
D Under floor heating circuit
Radiator heating circuit
E
F Heating circuit pump
Mixing valve temperature sensor ?
G
Accessory kit for heating circuit with mixing valve
H
I Domestic hot water storage tank
Integral expansion tank
J
K Temperature and pressure relief valve outlet
L Pressure relief valve outlet
DHW circulating pump sA
M
N Boiler pump
20
Low-loss header
O
Low-loss header sensor ?
P
Q DCW inlet
DHW outlet
R
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 9 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 9, 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
27