Bosch ZBR 42-3 A NG User Manual

Contents
3
Greenstar – 6721822579 (2021/01)
9 ZBR...-3A appliances (heating boiler) with DHW tank:
Thermal disinfection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
10 Boiler circulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
10.1 Pump anti-seize protection . . . . . . . . . . . . . . . . . . . . . . 54
10.2 Changing the pump curve of the boiler pump . . . . . . . . 54
11 Heatronic boiler control settings . . . . . . . . . . . . . . . . . . . . . . . 55
11.1 Guideline to service functions . . . . . . . . . . . . . . . . . . . . 55
11.2 Overview of the service functions . . . . . . . . . . . . . . . . . 56
11.2.1 First service level (press and hold the service
button until it lights up) . . . . . . . . . . . . . . . . . . . . . . . . . 56
11.2.2 Second service level (at first service level, service
button lights up, press ECO button and key pad
lock button simultaneously until 8.A appears) . . . . . . . 56
11.3 Description of the service functions . . . . . . . . . . . . . . . 56
11.3.1 First service level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
11.3.2 Second service level . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
12 Gas adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
12.1 Converting to a different gas type . . . . . . . . . . . . . . . . . 62
12.2 Installation location higher than 2,000 feet (610
m) above sea level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
12.3 Checking and setting the gas-air ratio (CO
2
or O
2
),
if required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
12.4 Dynamic gas pressure test port . . . . . . . . . . . . . . . . . . . 64
13 Flue gas test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
13.1 Emissions test button . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
13.2 Measuring CO content of flue gas . . . . . . . . . . . . . . . . . 64
14 Environmental protection and disposal. . . . . . . . . . . . . . . . . . 65
15 Inspection and maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
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 (only combi boiler ZWB...-3A) . . . . . 66
15.1.3 Plate type heat exchanger (only combi boiler
ZWB...-3A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
15.1.4 Checking electrodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
15.1.5 Burner servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
15.1.6 Heat exchanger block inspection and cleaning . . . . . . . 68
15.1.7 Cleaning condensate trap. . . . . . . . . . . . . . . . . . . . . . . . 69
15.1.8 Checking the mixer diaphragm . . . . . . . . . . . . . . . . . . . 69
15.1.9 Checking the expansion vessel . . . . . . . . . . . . . . . . . . . 70
15.1.10 Setting the boiler water pressure . . . . . . . . . . . . . . . . . 70
15.1.11 Testing system water quality . . . . . . . . . . . . . . . . . . . . . 70
15.1.12 Checking the electrical wiring. . . . . . . . . . . . . . . . . . . . 70
15.2 Maintenance and inspection checklist. . . . . . . . . . . . . . 71
16 Readings on the display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
17 Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
17.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
17.2 Faults that are shown on the display . . . . . . . . . . . . . . .74
17.3 Faults that are not shown on the display . . . . . . . . . . . .76
17.4 Check sensor values. . . . . . . . . . . . . . . . . . . . . . . . . . . .77
17.4.1 Outdoor temperature sensor . . . . . . . . . . . . . . . . . . . . .77
17.4.2 Additional supply temperature limiter. . . . . . . . . . . . . .77
17.4.3 Supply temperature sensor, External supply
temperature sensor, DHW tank temperature
sensor, DHW temperature sensor . . . . . . . . . . . . . . . . .77
17.5 Replacement code plug . . . . . . . . . . . . . . . . . . . . . . . . .77
18 Commissioning log for the appliance . . . . . . . . . . . . . . . . . . .78

Bosch ZBR 42-3 A NG Specifications

General

Brand	Bosch
Model	ZBR 42-3 A NG
Category	Boiler
Language	English