Bosch KWB42-3A Installation And Maintenance Instructions For Contractors

Information about the appliance
25
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
3.18 Technical data combi boiler KWB 42-3
Input / Output Unit NG LPG (Propane)
Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 151,600 (44.4) 148,300 (43.5)
Max. output rate 104/86 °F (40/20 °C) BTU/hr (kW) 137,500 (40.3) 137,500 (40.3)
Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 137,500 (40.3) 137,500 (40.3)
Max. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 134,400 (39.4) 134,400 (39.4)
Output rate domestic hot water (DHW) 113 °F (45 °C) BTU/hr (kW) 137,500 (40.3) 137,500 (40.3)
Output rate domestic hot water (DHW) 140 °F (60 °C) BTU/hr (kW) 135,800 (39.8) 135,800 (39.8)
Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 36,000 (10.5) 46,400 (13.6)
Max. output rate 104/86 °F (40/20 °C) BTU/hr (kW) 35,500 (10.4) 46,400 (13.6)
Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 35,100 (10.3) 46,100 (13.5)
Max. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 31,700 (9.3) 42,000 (12.3)
Input / Output at elevation 2000 - 4500 feet (611 - 1372 metres)
Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 136,440 (40.0) 139,402 (40.9)
Max. output rate 104/86 °F (40/20 °C) BTU/hr (kW) 123,750 (36.3) 129,250 (37.9)
Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 123,750 (36.3) 129,250 (37.9)
Max. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 120,960 (35.3) 126,336 (37.0)
Output rate domestic hot water (DHW) 113 °F (45 °C) BTU/hr (kW) 123,750 (36.3) 129,750 (37.9)
Output rate domestic hot water (DHW) 140 °F (60 °C) BTU/hr (kW) 122,220 (35.8) 127,652 (37.4)
Input / Output at elevation 4500 - 7000 feet (1373 - 2143 metres)
Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 125,828 (36.9) 129,021 (37.8)
Max. output rate 104/86 °F (40/20 °C) BTU/hr (kW) 114,125 (33.5) 119,625 (35.1)
Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 114,125 (33.3) 119,625 (35.1)
Max. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 111,552 (32.7) 116,928 (34.3)
Output rate domestic hot water (DHW) 113 °F (45 °C) BTU/hr (kW) 114,125 (33.5) 129,750 (37.9)
Output rate domestic hot water (DHW) 140 °F (60 °C) BTU/hr (kW) 112,714 (33.0) 127,652 (37.4)
Gas connection value
Natural gas - H
s
=1,010 BTU/ft
3
(37.3MJ/m
3
)ft
3
/hr (m
3
/h) 149 (4.2) -
Liquid Propane Gas - HD-S = 2,500 BTU/ft
3
(37.3MJ/m
3
)ft
3
/hr (m
3
/h) - 59 (1.7)
Permissible gas inlet 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 Gallon (litre) 3.17 (12) 3.17 (12)
DHW
Maximum DHW flow rate gpm (litres/min.) 3.963 (15) 3.963 (15)
Nominal DHW flow rate (at 140 °F (60 °C) outlet temperature) gpm (litres/min.) 3.61 (11.4) 3.61 (11.4)
Outlet temperature °F ( °C) 104 - 140 (40 - 60) 104 - 140 (40 - 60)
Maximum cold water inlet temperature °F ( °C) 140 (60) 140 (60)
Maximum approved DHW pressure psi (bar) 150 (10.3) 150 (10.3)
Minimum water pressure psi (bar) 4.35 (0.3) 4.35 (0.3)
Flue gas
Flue gas mass flow at maximum/minimum nominal output gps 18.0/4.5 17.5/5.6
Flue gas temperature 176/140 °F (80/60 °C) at max./min. nominal output °F ( °C) 171/135 (77/57) 171/135 (77/57)
Flue gas temperature 104/86 °F (40/30 °C) at max./min. nominal output °F ( °C) 133/91 (56/33) 133/91 (56/33)
CO
2
at maximum nominal output % 9.4 11.0
CO
2
at minimum nominal output % 8.6 10.4
Condensate
Maximum condensate quality (t
R
= 86 °F (30 °C)) gph (l/h) 0.32 (1.2) 0.32 (1.2)
pH level approx. 4.8 4.8
General

Bosch KWB42-3A Specifications

General

Brand	Bosch
Model	KWB42-3A
Category	Boiler
Language	English