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Bosch KBR28-3A User Manual

Bosch KBR28-3A
100 pages
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6 720 810 590 (2020/04) CA/US
Installation and Maintenance Instructions for Contractors
Residential Gas Condensing Boiler
Greenstar FS/Combi FS
6720810590-00.2Wo
KBR16-3A | KBR21-3A | KBR28-3A | KBR35-3A | KBR42-3A | KWB28-3A | KWB35-3A | KWB42-3A

Table of Contents

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Bosch KBR28-3A Specifications

General IconGeneral
BrandBosch
ModelKBR28-3A
CategoryBoiler
LanguageEnglish

Summary

Symbols and Safety Instructions

General safety instructions

Provides critical safety advice for gas leaks, smell of gas, and flue gas scenarios.

DANGER: Risk of fire when soldering and brazing!

DANGER: Risk of personal injury or death from flue gas poisoning!

Addresses risks from flue gas, venting systems, blockages, and improper installation.

DANGER: Risk of personal injury or death from explosion!

Outlines dangers related to gas components, installation, and service work.

DANGER: Risk of personal injury or death from fire!

Warns against flammable materials in the boiler room and required clearances.

DANGER: Risk of personal injury or death from electric shock!

Emphasizes electrical safety, power disconnection, and lockout/tagout procedures.

DANGER: Safety devices!

Warns against shutting off safety valves and potential hot water escape.

DANGER: Risk of personal injury or death after a flood!

States that appliances subjected to flooding must be replaced.

Information about the appliance

Product dimensions and minimum clearances

Provides detailed dimensions and required clearances for installation.

Dimensions and minimum clearances (front, rear, side view)

Illustrates dimensions and minimum clearances with specific values.

Electrical wiring diagram for heating boiler KBR..-3A

Illustrates the electrical wiring for the KBR heating boiler.

Key to figure 8 Heating boiler KBR..-3A

Provides a key for the KBR heating boiler electrical wiring diagram.

Electrical wiring diagram Combi boiler KWB..-3A

Illustrates the electrical wiring for the KWB combi boiler.

Key to figure 9 Combi boiler KWB..-3A

Provides a key for the KWB combi boiler electrical wiring diagram.

Technical data - Heating boiler KBR 16-3

Lists technical specifications for the KBR 16-3 heating boiler.

Technical data heating boiler KBR21-3

Lists technical specifications for the KBR 21-3 heating boiler.

Technical data heating boiler KBR 28-3

Lists technical specifications for the KBR 28-3 heating boiler.

Technical data heating boiler KBR 35-3

Lists technical specifications for the KBR 35-3 heating boiler.

Technical data heating boiler KBR 42-3

Lists technical specifications for the KBR 42-3 heating boiler.

Technical data combi boiler KWB 28-3

Lists technical specifications for the KWB 28-3 combi boiler.

Technical data combi boiler 35-3

Lists technical specifications for the KWB 35-3 combi boiler.

Technical data combi boiler KWB 42-3

Lists technical specifications for the KWB 42-3 combi boiler.

Regulations

Compliance with standards and regulations

Details applicable national and local codes and standards for installation.

Common applications of KBR boilers

Wiring - Multi zone with zone valves and LWCO

Details wiring for multi-zone systems using zone valves and LWCO.

Wiring

Details wiring connections for multi-zone systems with circulators.

Installation

Important notes

Covers crucial installation notes, system filling, and commissioning steps.

Recommended steps for commissioning a new or retrofit boiler installation

Provides a step-by-step guide for boiler commissioning.

Primary-secondary piping or Low Loss Header (LLH)

Explains the use of LLH for hydraulic separation in multi-zone systems.

Selecting the installation location

Details requirements for choosing the installation location.

Low Loss Header (LLH) utilization

Explains the use of LLH for hydraulic separation and flow rate management.

Installing a Low Water Cut off (LWCO)

Explains the installation of an LWCO device on the boiler's supply pipe.

Installing a LWCO device - removing dummy plug

Illustrates removing the dummy plug for LWCO installation.

Installing a LWCO device – securing with a clip

Shows how to secure the LWCO device with a clip.

Connecting the flue gas accessories

Lists optional vent systems and how to attach the vent flange.

Horizontal venting system (telescopic concentric vent kit)

Illustrates horizontal venting using a telescopic concentric kit.

Installing the concentric vent adaptor

Shows how to install the concentric vent adaptor.

Installation of the exhaust and air intake

Emphasizes correct venting to prevent carbon monoxide poisoning.

Direct vent installations (sealed combustion)

Lists requirements for direct vent applications.

Vent & combustion air pipe position of a sealed combustion system

Illustrates pipe positioning for sealed combustion systems.

Materials for pipe

Provides a table of pipe materials and their compliance.

Vent and combustion air pipe position

Illustrates vent and air pipe positions with clearances.

Vertical venting system (sealed combustion)

Shows more vertical venting examples for sealed combustion.

Vent and combustion pipe lengths

Provides maximum pipe lengths based on configuration and elbows.

Electrical connection

Electrical connections in the junction boxes

Details access to junction boxes for electrical connections.

Connecting the BUS-System

Explains how to connect the BUS system to the boiler.

Low voltage (LV) connections

Shows low voltage terminal connections.

High voltage junction box

Details connections for mains power, pumps, and circulators.

Connecting an external heating zone pump or DHW recirculation pump

Guides on connecting external pumps or recirculation pumps.

Connecting mains power supply

Details routing and connecting the mains power cable.

Low voltage (LV) junction box

Covers connections for sensors, thermostats, and programmers.

Connecting the LWCO device

Details the process for connecting the LWCO device.

Commissioning

Before operating the appliance

Outlines pre-operation checks and system filling.

Scalding

Warns about scalding risks and recommends limiting DHW temperature.

KBR...3A appliances with DHW tank: Thermal disinfection

Explains how to perform thermal disinfection of the DHW system.

Heatronic boiler control settings

Service function 2.d: Thermal disinfection (Legionella protection)

Enables thermal disinfection to prevent Legionella bacteria.

Gas type conversion

Personal injury and property damage

Warns about dangers during conversion if instructions are not followed.

Converting to a different gas type

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

Setting the gas/air ratio (CO2 or O2)

Guides on setting the gas-air ratio using an analyzer.

Dynamic gas pressure test

Details how to perform a dynamic gas pressure test.

Flue gas test

Measuring CO content of the flue gas

Guides on measuring CO levels using a flue gas probe.

Inspection and maintenance

Burner servicing

Explains how to service the burner, including cover removal and cleaning.

Heat exchanger block inspection and cleaning

Covers inspection and cleaning of the heat exchanger block.

Checklist for annual inspection and maintenance

Provides a checklist for annual inspection and maintenance procedures.

Faults

Troubleshooting

Provides initial troubleshooting steps for appliance faults.

DANGER: Explosion!

Safety warning regarding gas cock and leaks.

DANGER: Risk of flue gas poisoning.

Safety warning regarding flue gas leaks.

DANGER: Risk of electric shock!

Safety warning regarding electrical hazards.

WARNING: Danger of scalding!

Safety warning about hot water scalding.

NOTICE: Risk of system damage from freezing!

Warns about freezing risks and draining procedures.

Faults that are shown on the display

Continues listing displayed faults and their elimination.

Faults that are not shown on the display

Lists faults not displayed and their potential causes/solutions.

Check sensor values

Provides resistance values for temperature sensors for diagnostics.

Commissioning log for the appliance

Gas setting and flue gas test:

Section for recording gas settings and flue gas test results.

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