Viessmann Vitodens 222-F B2TB, Application Manual

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14
Pump Information
IMPORTANT
Pump selection must be based on accurate system flow
and pressure drop calculations (includes DHW sizing).
Sizing of Low-Loss Header in a Residential Single-Boiler Application
* 1 For system
U
t < 20°F ( 11ºC) use low-loss header sizes for
U
t 20°F (11ºC).
* 2 Low-Loss temperature sensor - is included with the boiler for use in single-boiler applications.
Boiler
Model
No. of
Boilers
Boiler
Max.
Flow
Rate
GPM
(L/h)
Typical System Flow Rates Viessmann
Low-loss
Temp.
Sensor
Required*
2
U
t *1
°F
(°C)
20
(11.0)
25
(13.9)
30
(16.8)
35
(16.1)
40
(13.4)
B2TB
19
1 6.2
(1400)
System Flow
Rate
LLH Required
LLH Model GPM
(L/h)
6.4
(1453)
Yes
80/60
5.1
(1163)
Optional
80/60
4.3
(969)
Optional
80/60
3.7
(830)
Optional
80/60
3.2
(727)
Optional
80/60
included
B2TB
35
1 6.2
(1400)
System Flow
Rate
LLH Required
LLH Model GPM
(L/h)
11.7
(2657)
Yes
80/60
9.4
(2126)
Yes
80/60
7.8
(1771.6)
Yes
80/60
6.7
(1518)
Yes
80/60
5.9
(1328)
Optional
80/60
included
Note: The Vitodens 222-F comes equipped with a factory preset integrated boiler pump.
Vitodens 222F B2TB 19-35 are equipped with a boiler/
system pump. The system pump flow must be selected
on
U
t. If the system flow exceeds the boiler’s maximum
flow rate , a low-loss header is strongly recommended.
Low-Loss Header Application
Heating Circuit
Vitodens 222-F, B2TB 19 and 35 Technical Data