Viessmann B2TF - Page 117

117
Gas boiler, type B and C, category II
2N3P
Type B2TF
Rated heating output range (details to EN 15502)
T
F
/T
R
= 50/30 °C (P(50/30))
Natural gas kW 1.9 - 19 1.9 - 25 1.9 - 32
LPG kW 2.5 - 19 2.5 - 25 2.5 - 32
T
F
/T
R
= 80/60 °C (Pn(80/60))
Natural gas kW 1.7 - 17.5 1.7 - 23 1.7 - 29.3
LPG kW 2.2 - 17.5 2.2 - 23 2.2 - 29.3
Supply voltage V DC 24
Power consumption W 4
Permissible ambient temperature
■
During operation °C +5 to +35
■
During storage and transport °C -5 to +60
Electronic temperature limiter setting
(TN) °C
91
Electronic temperature cut-out setting °C 110
Weight excl. heating water kg 111.5
Permiss. operating pressure, heating wa-
ter side (PMS)
bar
MPa
3
0.3
Weight
– Excl. heating water and DHW kg 111.5 111.5 111.5
– Incl. heating water and DHW kg
Water capacity (excl. diaphragm expansion
vessel)
l 3.0 3.0 3.0
Max. flow temperature °C 82 82 82
Max. flow rate
(Limit for the use of hydraulic separation)
l/h See residual head graphs
Nominal circulating water volume
At T
F
/T
R
= 80/60 °C
l/h 818 1076 1374
Expansion vessel
Capacity l 18 18 18
Pre-charge pressure bar 0.75 0.75 0.75
kPa 75 75 75
Permiss. operating pressure bar 3 3 3
MPa 0.3 0.3 0.3
Connections (with connection accessories)
Boiler flow and return R ¾ ¾ ¾
Cold water and DHW R ½ ½ ½
DHW circulation R ½ ½ ½
Dimensions
Length mm 595 595 595
Width mm 600 600 600
Height mm 1400 1400 1400
Gas connection (with connection accesso-
ries)
R ½ ½ ½
Specification
Specification (cont.)
6151778
Service