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Bosch ZWB 28-3 A NG User Manual

Bosch ZWB 28-3 A NG
80 pages
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6721822579 (2021/01) US/CA
Installation and Service Instructions for Contractors
Residential Gas Condensing Boiler
Greenstar
0010004900-002
WARNING:
Improper installation, set-up, modification, operation or maintenance
of the heating system can cause personal injury and property damage.
Follow these instructions precisely.
If you require assistance or further information, contact a trained and
certified installer or the gas supply company.
WARNING:
The operating instructions are part of the technical documents that
must be handed over to the owner or operator of the heating system.
Explain to the owner or operator how to use the heating system using
the operating instructions. Make sure that they are familiar with all
required information for the safe and proper operation of the heating
system.
These instructions are available in English and French.
Please keep these instructions for future reference.
ZBR 21-3 A... | ZBR 28-3 A... | ZBR 35-3 A... | ZBR 42-3 A... | ZWB 28-3 A... | ZWB 35-3 A... |
ZWB 42-3 A...

Table of Contents

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Bosch ZWB 28-3 A NG Specifications

General IconGeneral
CategoryBoiler
Fuel TypeNatural Gas
Max. Thermal Power28 kW
Efficiency ClassA
Weight36 kg

Summary

1 Explanation of Symbols and Safety Instructions

1.2 General Safety Instructions

Provides essential safety guidelines for handling gas leaks, flue gas, and general operational safety.

6 Notes on Installation and Operation

6.1 Notes on Installation and Operation

Covers essential notes for installing and operating the heating system correctly.

6.1.1 Important Notes

Details critical notes regarding water systems, antifreeze, and system pressure.

6.6 Mounting the Appliance

Provides instructions for securely mounting the boiler appliance.

6.7 Installing the Low Water Cut Off (LWCO)

Details the procedure for installing the Low Water Cut Off device.

6.8 Connecting Flue Gas Accessories

Explains the connection of flue gas accessories, including vent systems.

6.8.1 Installation of Exhaust and Air Intake System

Covers installation requirements for exhaust and air intake systems.

6.8.3 Vent and Combustion Air Pipe Lengths

Specifies maximum allowable vent and combustion air pipe lengths.

6.9 Testing Gas and Water Connections for Leaks

Provides procedures for testing gas and water connections to ensure leak-free operation.

7 Electrical Connection

7.1 General Notes

Covers general notes, safety warnings, and requirements for electrical connections.

7.3.4 Connecting Mains Power Supply

Details the procedure for connecting the mains power supply to the boiler.

7.4 Connecting the LWCO Device

Provides step-by-step instructions for connecting the Low Water Cut Off device.

8 Commissioning

8.1 Before Operating the Appliance

Covers essential checks before operation, including filling and purging the system.

8.3 Switch on Heat

Guides on enabling heating operation and setting the supply temperature.

8.6 Setting DHW Temperature (ZBR...-3A)

Guides on setting the DHW temperature for ZBR...-3A appliances.

8.7 Setting DHW Temperature (ZWB...-3A)

Guides on setting the DHW temperature for ZWB...-3A appliances.

9 ZBR...-3A Appliances with DHW Tank: Thermal Disinfection

11 Heatronic Boiler Control Settings

11.1 Guideline to Service Functions

Provides guidance on accessing and using Heatronic service functions for appliance configuration.

11.2 Overview of the Service Functions

Lists and describes the available service functions categorized by levels.

11.2.1 First Service Level

Details how to access and navigate the first level of service functions.

11.2.2 Second Service Level

Details how to access the second level of service functions.

11.3 Description of the Service Functions

Provides descriptions for the service functions.

11.3.1 First Service Level

Describes service functions accessible in the first level.

12 Gas Adjustment

12.1 Converting to a Different Gas Type

Explains the process for converting the boiler to a different gas type.

12.3 Checking and Setting Gas-Air Ratio (CO2 or O2)

Describes how to check and set the gas-air ratio for optimal combustion.

12.4 Dynamic Gas Pressure Test Port

Details how to use the dynamic gas pressure test port.

13 Flue Gas Test

13.1 Emissions Test Button

Explains how to use the emissions test button to select outputs for testing.

13.2 Measuring CO Content of Flue Gas

Provides instructions for measuring CO content in flue gas for safety.

15 Inspection and Maintenance

16 Readings on the Display

Troubleshooting Faults

Provides guidance on troubleshooting common appliance faults and system issues.

18 Commissioning Log for the Appliance

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