5461 889 - 16
30
Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Waterside flow (primary circuit)
The Vitodens 222-F, B2TB is designed for closed loop,
forced circulation hot water heating systems only.
Use standard friction loss method for pipe sizing. Observe
boiler maximum and minimum flow rate limitations.
If system flow rate exceeds boiler maximum flow rate
(as stated above), falls below the minimum flow rate
or if system flow rate is unknown, Viessmann strongly
recommends the installation of a low-loss header.
Once the low-loss header is connected, the built-in low-
loss header logic of the Vitodens 222-F boiler ensures
the required t across the system through the sensory
communication between the low-loss header and the
boiler.
An alternative method may be used, such as primary
secondary piping using closely spaced tees. A low-loss
header offers additional benefits not provided by a pair
of closely spaced tees. Viessmann therefore strongly
recommends and prefers the use of a low-loss header
over closely spaced tees. Refer to the Technical Data
manual for low-loss header information.
Boiler Connections
Waterside Flow
Boiler maximum flow rate 6.2 GPM (1400 L/h)
Boiler maximum flow rate 6.2 GPM (1400 L/h)
Pressure drop (primary circuit) for
Vitodens 222-F, B2TB 19, 35, 68, 125
Model B2TB 19, 68 1 boiler
Output (NG/LPG)
MBH 64
System t for NG/LPG
20ºF (11ºC) rise GPM (L/h) 6.4 (1453)
25ºF (14ºC) rise GPM (L/h) 5.1 (1163)
30ºF (17ºC) rise GPM (L/h) 4.3 (969)
35ºF (19.5ºC) rise GPM (L/h) 3.7 (830)
40ºF (22ºC) rise GPM (L/h) 3.2 (727)
Model B2TB 35, 125 1 boiler
Output (NG/LPG)
MBH 117
System t for NG/LPG
20ºF (11ºC) rise GPM (L/h) 11.7 (2657)
25ºF (14ºC) rise GPM (L/h) 9.4 (2126)
30ºF (17ºC) rise GPM (L/h) 7.8 (1771)
35ºF (19.5ºC) rise GPM (L/h) 6.7 (1518)
40ºF (22ºC) rise GPM (L/h) 5.9 (1328)
Flow rate
Supply head pressure (water)
To Next Page
Loading...
