Bosch ZBR28-3A - Technical Data Combi Boiler ZWB28-3 A

28 | Information about the appliance
Copyright (optional information)6 720 643 068 (2011/06)
3.15 Technical data combi boiler ZWB28-3A...
Unit NG LPG (propane)
Output at elevation 0 - 2000 feet (0 - 610 m)
Maximum nominal output (P
max
) 104/86 °F (40/30 °C) BTU/hr (kW) 93,800 (27.5) 93,800 (27.5)
Maximum nominal output (P
max
) 122/86 °F (50/30 °C) BTU/hr (kW) 93,100 (27.3) 93,100 (27.3)
Maximum nominal output (P
max
) 176/140 °F (80/60 °C) BTU/hr (kW) 89,400 (26.2) 89,400 (26.2)
Max. nominal thermal load (Q
max
) heating (H
i
) 180/79 °F (82/26 °C) BTU/hr (kW) 90,800 (26.6) 90,800 (26.6)
Max. nominal thermal load (Q
max
) heating (H
s
) 180/79 °F (82/26 °C) BTU/hr (kW) 100,800 (29.5) 98,600 (28.9)
Min. nominal output (P
min
) 104/86 °F (40/30 °C) BTU/hr (kW) 23,900 (7.0) 39,900 (11.7)
Min. nominal output (P
min
) 122/86 °F (50/30 °C) BTU/hr (kW) 23,900 (7.0) 39,600 (11.6)
Min. nominal output (P
min
) 176/140 °F (80/60 °C) BTU/hr (kW) 21,800 (6.4) 36,200 (10.6)
Min. nominal thermal load (Q
min
) heating (H
i
) 180/79 °F (82/26 °C) BTU/hr (kW) 22,200 (6.5) 36,800 (10.8)
Min. nominal thermal load (Q
min
) heating (H
s
) 180/79 °F (82/26 °C) BTU/hr (kW) 24,600 (7.2) 40,100 (11.7)
Max. nominal output (P
max
) DHW (H
i
) 113°F (45°C) BTU/hr (kW) 93,600 (27.4) 93,600 (27.4)
Max. nominal output (P
max
) DHW (H
s
) 140°F (60°C) BTU/hr (kW) 91,400 (26.8) 91,400 (26.8)
Max. nominal thermal load (Q
max
) DHW (H
i
) BTU/hr (kW) 90,800 (26.6) 90,800 (26.6)
Max. nominal thermal load (Q
max
) DHW (H
s
)BTU/hr (kW)100,800 (29.5) 98,600 (28.9)
Min. nominal thermal load (Q
min
) DHW (H
i
)BTU/hr (kW)22,200 (6.5) 36,800 (10.8)
Min. nominal thermal load (Q
min
) DHW (H
s
)BTU/hr (kW)24,600 (7.2) 40,100 (11.7)
Gas connection value
Natural Gas – H
s
= 1,010 BTU/ft
3
(37.3MJ/m
3
)ft
3
/hr (m
3
/h) 99 (2.8) –
Liquid Propane Gas – H
D-S
= 2,500 BTU/ft
3
(93.1MJ/m
3
)ft
3
/hr (m
3
/h) – 39 (1.1)
Permissible inlet gas pressure
NG in. W.C. (mbar) 3.5-10.5" (8.7-26.1) –
LPG (propane) in. W.C. (mbar) – 8-13" (19.9-32.3)
Expansion vessel
Pre-charge pressure psi (bar) 10.9 (0.75) 10.9 (0.75)
Total contents Gal (L) 3.17 (12) 3.17 (12)
DHW
Max. DHW flow rate gpm (l/min) 2.64 (10) 2.64 (10)
Nominal DHW quantity (at 140 °F (60 °C) outlet temperature) gpm (l/min) 2.03 (7.7) 2.03 (7.7)
Outlet temperature °F ( °C) 104 - 140 (40 - 60) 104 - 140 (40 - 60)
Max. cold water inlet temperature °F ( °C) 140 (60) 140 (60)
Max. approved DHW pressure psi (bar) 150 (10.3) 150 (10.3)
Minimum water pressure psi (bar) 4.35 (0.3) 4.35 (0.3)
Specific flow rate to EN 625 (D) gpm (l/min) 3.75 (14.2) 3.75 (14.2)
Calculation values for calculating cross-section to EN 13384
Flue gas mass flow at maximum/minimum nominal output gps 12.0/3.2 11.7/4.9
Flue gas temperature 176/140 °F (80/60 °C) at maximum/minimum
nominal heat input
°F ( °C)
147/133 (64/56) 147/133 (64/56)
Flue gas temperature 104/86 °F (40/30 °C) at maximum/minimum
nominal heat input
°F ( °C)
117/90 (47/32) 117/90 (47/32)
CO
2
at max. nominal output % 9.4 11.0
CO
2
at minimum nominal output % 8.6 10.4
Condensate
Max. condensate quantity (t
R
= 86 °F (30 °C)) gph (l/h) 0.6 (2.3) 0.6 (2.3)
pH level, approx. 4.8 4.8
Tab. 8 Technical data combi boiler ZWB28-3A...