Bosch KBR42-3A Installation And Maintenance Instructions For Contractors

Contents
3
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
11.2.2 Second service level. . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
11.3 Description of the service functions . . . . . . . . . . . . . . . 57
11.3.1 First level service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
11.3.2 Second service level. . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
12 Gas type conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
12.1 Installation location higher than 2,000 feet
(610m) above sea level . . . . . . . . . . . . . . . . . . . . . . . . . 63
12.2 Setting the gas/air ratio (CO2 or O2) . . . . . . . . . . . . . . 63
12.3 Dynamic gas pressure test . . . . . . . . . . . . . . . . . . . . . . . 64
13 Flue gas test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
13.1 Emissions test button . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
13.2 Measuring CO content of the flue gas . . . . . . . . . . . . . . 65
14 Environmental protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
14.1 Environmental protection and disposal. . . . . . . . . . . . . 66
15 Inspection and maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
15.1 Description of various steps. . . . . . . . . . . . . . . . . . . . . . 66
15.1.1 Calling up the latest fault (service function 6.A). . . . . . 66
15.1.2 Fresh water filter in the cold water pipe . . . . . . . . . . . . 66
15.1.3 Plate type heat exchanger (only combi boiler
KWB..-3A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
15.1.4 Checking the electrodes. . . . . . . . . . . . . . . . . . . . . . . . . 68
15.1.5 Burner servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
15.1.6 Heat exchanger block inspection and cleaning . . . . . . . 69
15.1.7 Cleaning condensate trap. . . . . . . . . . . . . . . . . . . . . . . . 70
15.1.8 Checking the mixer diaphragm . . . . . . . . . . . . . . . . . . . 70
15.1.9 Expansion vessel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
15.1.10 Setting the boiler water pressure . . . . . . . . . . . . . . . . . 71
15.1.11 Testing system water quality . . . . . . . . . . . . . . . . . . . . . 71
15.1.12 Checking the electrical wiring. . . . . . . . . . . . . . . . . . . . 71
15.2 Checklist for annual inspection and maintenance . . . . 72
16 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
16.1 Readings on the display . . . . . . . . . . . . . . . . . . . . . . . . . 73
17 Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
17.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
17.2 Faults that are shown on the display . . . . . . . . . . . . . . . 75
17.3 Faults that are not shown on the display . . . . . . . . . . . . 77
17.4 Check sensor values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
17.4.1 Outdoor temperature sensor (available as
accessory). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
17.4.2 Additional supply temperature limiter. . . . . . . . . . . . . . 78
17.4.3 Supply temperature sensor, DHW temperature
sensor, external supply temperature sensor . . . . . . . . . 78
17.4.4 Replacement code plug . . . . . . . . . . . . . . . . . . . . . . . . . 78
18 Commissioning log for the appliance. . . . . . . . . . . . . . . . . . . . 79
19 Spare parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
19.1 Group 1 - Sheet metal - Greenstar . . . . . . . . . . . . . . . . . 82
19.2 Group 2 - Burner/Heat exchanger - Greenstar . . . . . . . 84
19.3 Group 3 - Gas valve / Fan / Mixing chamber -
Greenstar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
19.4 Group 4 - Pipes combi boiler KWB..3A - Greenstar . . . .88
19.5 Group 5 Pipes Heat only boiler KBR...3A -
Greenstar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
19.6 Group 6 - Control box - Greenstar . . . . . . . . . . . . . . . . .92
19.7 Group 7 - Hydraulic block - Combi boiler KWB..3A
- Greenstar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
19.8 Group 8 - Accessories for service/installation -
Greenstar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

Bosch KBR42-3A Specifications

General

Brand	Bosch
Model	KBR42-3A
Category	Boiler
Language	English