Viessmann B2TB004 - Page 36

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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Installation Examples
System Layout 5
Vitodens 222-F, B2TB with...
- Integrated DHW production
- one heating circuit with mixing valve
- one heating circuit without mixing valve and low-loss header
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:
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
mixing valve.
Legend
A Vitodens 222-F B2TB boiler with
Vitotronic 200, HO1B outdoor reset control
B Outdoor temperature sensor !
C Vitotrol remote (optional)
D Under floor heating circuit
E Radiator heating circuit
F Boiler pump
20
G Mixing valve temperature sensor ?
H Kit for heating circuit with mixing valve
I Domestic hot water storage tank
J Integral expansion tank
K Temperature and pressure relief valve outlet
L Pressure relief valve outlet
M Heating pump 28/20
N Low-loss header
O Viessmann temperature sensor for low-loss header ?
P DCW inlet
Q DHW outlet
R DHW circulating pump sA