Bosch ZBR 21-3 A NG - Page 19

Product Description
19
Greenstar – 6721822579 (2021/01)
Table 4 Technical data ZBR 28-3 A..., ZBR 35-3 A...
ZBR 28-3 A... ZBR 35-3 A...
Input/Output Unit NG LPG (propane) NG LPG (propane)
Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 100,800 (29.5) 98,600 (28.9) 131,900 (38.6) 129,100 (37.8)
Max. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 93,800 (27.5) 93,800 (27.5) 122,800 (36.0) 122,800 (36.0)
Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 93,100 (27.3) 93,100 (27.3) 121,800 (35.7) 121,800 (35.7)
Max. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 89,400 (26.2) 89,400 (26.2) 116,700 (34.2) 116,700 (34.2)
Min. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 24,600 (7.2) 40,100 (11.7) 36,000 (10.5) 46,400 (13.6)
Min. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 23,900 (7.0) 39,900 (11.7) 35,100 (10.3) 46,100 (13.5)
Min. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 23,900 (7.0) 39,600 (11.6) 34,800 (10.2) 45,700 (13.4)
Min. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 21,800 (6.4) 36,200 (10.6) 31,700 (9.3) 42,000 (12.3)
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) – 130 (3.7) –
Liquid Propane Gas – H
D-S
= 2,500 BTU/ft
3
(93.1MJ/m
3
)ft
3
/hr (m
3
/h) – 39 (1.1) – 52 (1.5)
Permissible inlet gas pressure
NG in. W.C. (mbar) 3.5-10.5"
(8.7-26.1)
– 3.5-10.5
(8.7-26.1)
–
LPG (propane) in. W.C. (mbar) – 8-13" (19.9-32.3) – 8-13 (19.9-32.3)
Flue gas
Flue gas mass flow at maximum/minimum nominal output
g/s
12.0/3.2 11.6/4.8 15.7/4.5 15.2/5.6
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) 162/135 (72/57) 162/135 (72/57)
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) 127/91 (53/33) 127/91 (53/33)
CO
2
at max. nominal output % 9.4 11.0 9.4 11.0
CO
2
at minimum nominal output % 8.6 10.4 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) 0.8 (3.1) 0.8 (3.1)
pH level, approx. 4.8 4.8 4.8 4.8
General
Voltage VAC 120
120 120 120
Frequency Hz 60 60 60 60
Max. power consumption (central heating mode) W 205 205 205 205
Max. power consumption (Stand-by) W <6 <6 <6 <6
Sound pressure level dB(A) ≤39 ≤39 ≤44 ≤44
Max. supply temperature °F ( °C) 187 (86) 187 (86) 187 (86) 187 (86)
Max. permissible operating pressure (P
MS
) heating psi (bar) 30 (2.07) 30 (2.07) 30 (2.07) 30 (2.07)
Permissible ambient temperature °F ( °C) 32 - 122 (0 - 50) 32 - 122 (0 - 50) 32 - 122 (0 - 50) 32 - 122 (0 - 50)
Nominal water capacity (heating) gal (l) 0.925 (3.5) 0.925 (3.5) 0.925 (3.5) 0.925 (3.5)
Weight (without packaging) lbs. (kg) 103.6 (47) 103.6 (47) 103.6 (47) 103.6 (47)
Dimensions, W x H x D inch
(mm)
17-21/64" × 33-15/32"13-57/64"
(440 × 850 × 353)
17-21/64" × 33-15/32"13-57/64"
(440 × 850 × 353)