Bosch KBR42-3A Installation And Maintenance Instructions For Contractors

Information about the appliance
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
24
3.17 Technical data combi boiler 35-3
Table 10
Input / Output Unit NG LPG (Propane)
Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 131,900 (38.6) 129,100 (37.8)
Max. output rate 104/86 °F (40/20 °C) BTU/hr (kW) 122,800 (36.0) 122,800 (36.0)
Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 121,800 (35.7) 121,800 (35.7)
Max. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 116,700 (34.2) 116,700 (34.2)
Output rate domestic hot water (DHW) 113 °F (45 °C) BTU/hr (kW) 120,500 (35.3) 120,500 (35.3)
Output rate domestic hot water (DHW) 140 °F (60 °C) BTU/hr (kW) 118,700 (34.8) 118,700 (34.8)
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) 35,100 (10.3) 46,100 (13.5)
Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 34,800 (10.2) 45,700 (13.4)
Max. output rate 176/140 °F (80/60 °C) BTU/hr (kW) 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) 130 (3.7) -
Liquid Propane Gas - HD-S = 2,500 BTU/ft
3
(37.3MJ/m
3
)ft
3
/hr (m
3
/h) - 52 (1.5)
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.) 3.17 (12) 3.17 (12)
Nominal DHW flow rate (at 140 °F (60 °C) outlet temperature) gpm (litres/min.) 2.6 (10) 2.6 (10)
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 15.7/4.5 15.2/5.6
Flue gas temperature 176/140 °F (80/60 °C) at max./min. nominal output °F ( °C) 162/135 (72/57) 162/135 (72/57)
Flue gas temperature 104/86 °F (40/30 °C) at max./min. nominal output °F ( °C) 127/91 (53/33) 127/91 (53/33)
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
Voltage Vac 120 120
Frequency Hz 60 60
Max. power consumption (central heating mode) W 205 205
Max. power consumption (standby mode) W <6 <6
Sound pressure level dB (A) ≤39 ≤39
Max. supply temperature °F ( °C) 190 (88) 190 (88)
Max. permissible operating pressure (P
MS
) heating psi (bar) 30 (2.07) 30 (2.07)
Permissible ambient temperature °F ( °C) 32-122 (0-50) 32-122 (0-50)
Nominal water capacity (heating) Gall (L) 0.925 (3.5) 0.925 (3.5)
Weight (without packaging) lbs (kg) 164 (74) 164 (74)
Maximum overall dimensions W x H x D inch (mm) 21
15
/
16
x 41
1
/
4
x 21
7
/
8
557 x 1048 x 555
21
15
/
16
x 41
1
/
4
x 21
7
/
8
557 x 1048 x 555

Bosch KBR42-3A Specifications

General

Brand	Bosch
Model	KBR42-3A
Category	Boiler
Language	English