Viessmann B2TF - Page 118

118
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
DHW loading cylinder
Capacity l 100 100 100
Permiss. operating pressure (DHW side) bar 10 10 10
MPa 1 1 1
Continuous DHW output kW 19.74 26.53 32.50
For DHW heating from 10 to 45 °C l/h 484.80 648.80 793.80
Performance factor N
L
*4
1.4 2.1 2.6
Initial DHW output
For DHW heating from 10 to 45 °C
l/10 min 163.70 196.20 215.50
Supply values
Relative to the max. load and
1013 mbar/15 °C
Natural gas E
m
3
/h
2.40 3.12 3.69
Natural gas LL
m
3
/h
2.79 3.63 4.29
LPG kg/h 1.76 2.29 2.71
Flue gas parameters
Temperature (at a return temperature of
30 °C)
– At rated heating output °C 41 46 59
– At partial load °C 38 38 38
Temperature (at a return temperature of 60
°C)
°C 67 72 77
Mass flow rate (for DHW heating)
Natural gas
– At rated heating output kg/h 40.4 54.2 62.1
– At partial load kg/h 3.2 3.2 3.2
LPG
– At rated heating output kg/h 39.8 53.2 61.1
– At partial load kg/h 3.9 3.9 3.9
Available draught Pa 250 250 250
mbar 2.5 2.5 2.5
Max. amount of condensate
To DWA-A 251
l/h 3.2 4.1 4.9
Condensate connection (hose nozzle) Ø mm 20 - 24 20 - 24 20 - 24
Flue gas connection Ø mm 60 60 60
Ventilation air connection Ø mm 100 100 100
*4
At 70 ºC average boiler water temperature and cylinder storage temperature Tcyl = 60 ºC.
DHW performance factor NL depends on cylinder storage temperature Tcyl.
Standard values: Tcyl = 60 ºC → 1.0 × NL Tcyl = 55 ºC → 0.75 × NL Tcyl = 50 ºC → 0.55 × NL Tcyl = 45 ºC → 0.3 × NL.
Specification
Specification (cont.)
6151778
Service