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Vitodens 200-W, B2HA 19 to 80 Technical Data
Accessories
Accessories for Vitodens 200-W
Low-Loss Header
(continued)
Use only a Viessmann supplied temperature sensor.
Do not use any other manufacturer’s temperature sensor.
Legend
AB Air
Bleed
BR Boiler
Return
BS Boiler
Supply
BY
Bypass (with laminar flow)
D
Debris and/or air
DV Drain
Valve
SC Sensor
Cable
SR System
Return
SS System
Supply
TS
Viessmann Temperature Sensor
SW Sensor
Well
When installing a low-loss header, the system mixed
supply temperature (T3) must be calculated as follows:
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
Vprimary < Vsecondary
T1 > T3
T2 = T4
Qprimary = Qsecondary
T1 167° F (75° C)
Vsecondary=VVbypass
IMPORTANT
IMPORTANT
Model No.
Max. system flow rate
Type 80/60
19.5 GPM (4.4 m
3
/h)
Type 120/80
35.2 GPM (8 m
3
/h)
Type 160/80
*1
44 GPM (10 m
3
/h)
Type 200/120 *
1
80 GPM (18 m
3
/h)
*1
Floor-mounted version (typically used for
multiple-boiler
installations).
Low-loss header design
(Type 80/50 or 120/80)
Principle of Operation
