Explanation Of Symbols And Safety Instructions; Explanation Of Symbols - Bosch Worcester 2000 Series Installation And Maintenance Instructions Manual

9.6 Flue gas analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
9.7 Checking the flue integrity . . . . . . . . . . . . . . . . . . . . . . .53
9.8 Cleaning the siphon and heat exchanger . . . . . . . . . . .53
9.8.1 Cleaning the heat exchanger . . . . . . . . . . . . . . . . . . . . .53
9.8.2 Cleaning the siphon . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
9.9 Setting the air/gas ratio . . . . . . . . . . . . . . . . . . . . . . . . .58
10 Replacement parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
10.1 Component access . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
10.2 Draining the appliance . . . . . . . . . . . . . . . . . . . . . . . . . .59
10.3 Checking the strainer in the cold water pipe. . . . . . . . .59
10.4 Checking the plate heat exchanger . . . . . . . . . . . . . . . .60
10.5 Checking the expansion vessel . . . . . . . . . . . . . . . . . . .60
10.6 Adjusting the operating pressure of the heating
system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
10.7 Removing the gas valve . . . . . . . . . . . . . . . . . . . . . . . . .60
10.8 Removing the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
10.9 Removing the automatic air vent valve . . . . . . . . . . . . .61
10.10 Removing the motor of the diverter valve . . . . . . . . . . .61
10.11 Removing the heat exchanger . . . . . . . . . . . . . . . . . . . .62
10.12 Replacing the control unit . . . . . . . . . . . . . . . . . . . . . . .62
10.13 Reattaching the casing on the side . . . . . . . . . . . . . . . .63
11 Fault finding and diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
11.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
11.2 Table of operation and fault displays . . . . . . . . . . . . . . .64
11.3 Pump operation and diagnosis . . . . . . . . . . . . . . . . . . .71
11.4 Faults that are not displayed . . . . . . . . . . . . . . . . . . . . .72
12 Environmental protection/disposal . . . . . . . . . . . . . . . . . . . . .73
13 Technical Specifications/Logs . . . . . . . . . . . . . . . . . . . . . . . . .74
13.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
13.2 Component resistance characteristics . . . . . . . . . . . . .75
13.2.1 Sensor values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
13.3 Heating curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
13.4 Internal wiring of the appliance . . . . . . . . . . . . . . . . . . .76
13.4.1 Electircal wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
13.5 Setting values for output . . . . . . . . . . . . . . . . . . . . . . . .77
13.5.1 Gas setting values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
13.6 Gas Boiler System Commissioning Checklist and
Warranty Validation Record . . . . . . . . . . . . . . . . . . . . . .78
13.7 Inspection and maintenance checklist . . . . . . . . . . . . .79
13.8 Service and Interim Boiler Work Record . . . . . . . . . . . .80
Worcester 2000 - 6 721 814 551 (2019/09)
1

Explanation of symbols and safety instructions

1.1

Explanation of symbols

Warnings
In warnings, signal words at the beginning of a warning are used to
indicate the type and seriousness of the ensuing risk if measures for
minimising danger are not taken.
The following signal words are defined and can be used in this document:
DANGER:
DANGER indicates that severe or life-threatening personal injury will
occur.
WARNING:
WARNING indicates that severe to life-threatening personal injury may
occur.
CAUTION:
CAUTION indicates that minor to medium personal injury may occur.
NOTICE:
NOTICE indicates that material damage may occur.
Important information
The info symbol indicates important information where there is no risk to
people or property.
Additional symbols
Symbol Meaning
▶ a step in an action sequence

a reference to a related part in the document
• a list entry
- a list entry (second level)
Table 1
Table of contents
3