Bosch KWB28-3 User Manual

Installation and Service Instructions for Contractors
Residential Gas Condensing Boiler
Greenstar FS/Combi FS
6720810590-00.2Wo
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.
NOTICE:
In Massachusetts, this appliance must be installed by a licensed
plumber or gas fitter.
These instructions are available in English and French.
Please keep these instructions for future reference.
Warranty information available at www.bosch-climate.us
Annual service is required
KBR16-3. |KBR21-3. |KBR28-3. |KBR35-3. |KBR42-3. |KWB28-3. |KWB35-3. |KWB42-3.
6720810590 (2015/05) CA/US

Bosch KWB28-3 Specifications

General

Brand	Bosch
Model	KWB28-3
Category	Boiler
Language	English

Summary

Key to symbols and safety instructions

General safety instructions

Crucial safety guidelines for installation and operation.

Information about the appliance

Electrical wiring heating boiler KBR..-3A

Illustrates the electrical connections for the KBR heating boiler.

Electrical wiring combi boiler KWB..-3A

Illustrates the electrical connections for the KWB combi boiler.

Common Applications of KBR boilers

Wiring

Illustrates the wiring for multi-zone systems with circulators.

Installation

Installation and operation

Covers essential steps for installing and operating the system.

Installing a low water cut off (LWCO)

Provides instructions for installing a low water cut-off device.

Connecting flue gas accessories

Testing gas and water connections for leaks

Making the electrical connections

General notes

Important general information and safety precautions for electrical work.

Electrical connections in the junction boxes

Connecting an external heating zone pump or DHW recirculation pump

Connecting mains power supply

Connecting the LWCO device

Commissioning

Before operating the appliance

Pre-operation checks and steps required before initial start-up.

Set up space heating

KBR..-3A appliances (heating boilers) with DHW tank: Setting the DHW temperature

KWB..-3A appliances (combi boilers): Setting the DHW temperature

Setting frost protection

Procedures for setting frost protection for the system and DHW tank.

Gas type conversion

Converting to a different gas type

Step-by-step guide for converting the appliance to a different gas type.

Setting the gas-air ratio (CO2 or O2)

Faults

Troubleshooting

General guidance for diagnosing and resolving appliance faults.

Faults that are shown on the display

Lists faults displayed on the unit and their solutions.

Faults that are not shown on the display

Lists faults not indicated on the display and their resolutions.

Check sensor values