Bosch Installation Manual

Product Description
21
Greenstar – 6721822579 (2021/01)
3.12 Technical data ZWB...-3A
Table 6 Technical data ZWB28-3A..., ZWB35-3A...
ZWB 28-3 A... ZWB 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)
Output rate domestic hot water (DHW), 113 °F (45 °C) BTU/hr (kW) 93,600 (27.4) 93,600 (27.4) 120,500 (35.3) 120,500 (35.3)
Output rate domestic hot water (DHW), 140 °F (60 °C) BTU/hr (kW) 91,400 (26.8) 91,400 (26.8) 118,700 (34.8) 118,700 (34.8)
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
) BTU/ft
3
(MJ/m
3
) 99 (2.8) – 130 (3.7) –
Liquid Propane Gas – H
D-S
= 2,500 BTU/ft
3
(93.1MJ/m
3
)BTU/ft
3
(MJ/m
3
) – 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)
Expansion vessel
Pre-charge pressure psi (bar) 10.9 (0.75) 10.9 (0.75) 10.9 (0.75) 10.9 (0.75)
Total contents gal (l) 3.17 (12) 3.17 (12) 3.17 (12) 3.17 (12)
DHW
Max. DHW flow rate gpm (l/min) 2.64 (10) 2.64 (10) 3.17 (12) 3.17 (12)
Nominal DHW flow rate (at 140 °F (60 °C) outlet temperature) gpm (l/min) 2.03 (7.7) 2.03 (7.7) 2.6 (10) 2.6 (10)
Outlet temperature °F ( °C) 104 - 140 (40 - 60) 104 - 140 (40 - 60) 104 - 140 (40 - 60) 104 - 140 (40 - 60)
Max. cold water inlet temperature °F ( °C) 140 (60) 140 (60) 140 (60) 140 (60)
Max. approved DHW pressure psi (bar) 150 (10.3) 150 (10.3) 150 (10.3) 150 (10.3)
Minimum water pressure psi (bar) 4.35 (0.3) 4.35 (0.3) 4.35 (0.3) 4.35 (0.3)
Flue gas
Flue gas mass flow at maximum/minimum nominal output
g/s
12.0/3.2 11.7/4.9 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 (4/32) 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) 110.2 (50) 110.2 (50) 110.2 (50) 110.2 (50)
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)