Accessories
Accessories for Vitodens 222-F
Low-Loss Header (continued)
Principle of Operation
Legend
T1
Boiler supply temperature
T2
Boiler return temperature
T3
System supply temperature
T4
System return temperature
Vprimary
Boiler circuit flow rate
Vsecondary
Heating circuit flow rate
Vbypass
Bypass flow rate
Qprimary
Heat supplied by boiler
Qsecondary
Heat consumed by system
20
Vitodens 222-F, B2TA 19 and 35 Technical Data
IMPORTANT
When installing a low-loss header, the system mixed
supply temperature (T3) must be calculated as follows:
Vprimary < Vsecondary
T1 > T3
T2 = T4
Qprimary = Qsecondary
T1 167° F (75° C)
Vsecondary=Vprimary+Vbypass
Model No.
Type 80/60
Type 120/80
Type 160/80 *1
Type 200/120 *1
*1 Floor-mounted version (typically used for
multiple-boiler installations).
Max. system flow rate
17.6 GPM (4 m
3
/h)
35.2 GPM (8 m
3
/h)
44 GPM (10 m
3
/h)
80 GPM (18 m
3
/h)