Bosch Buderus SSB255 User Manual

Bosch Buderus SSB Boiler Control Operations
SSB255 | SSB399 | SSB512
Control Operations Guide
WARNING:
the heating system can cause personal injury and property damage.
Follow these instructions precisely.
If you require assistance or further information, contact a licensed

Bosch Buderus SSB255 Specifications

General

Model	Buderus SSB255
Category	Boiler
Fuel Type	Natural Gas
Efficiency	Up to 95% AFUE
Heat Exchanger Material	Stainless Steel
Modulation Ratio	5:1
Weight	180 lbs
Operating Pressure	30 psi (Maximum)

Summary

Key to Symbols and Safety Instructions

Key to Symbols

Explanation of warning symbols used in the document, including keywords like DANGER, WARNING, CAUTION, and NOTICE.

Safety Precautions

Essential safety warnings and instructions for installation, setup, modification, operation, and maintenance.

Boiler Settings Menu

Heating Modes

Central Heating (CH) Mode

Details six onboard CH Mode settings, including default mode, outdoor reset, and analog controls.

General Operation Settings

Outdoor Reset Curve Settings

Domestic Hot Water

Domestic Hot Water Settings

Configuration parameters for domestic hot water, including modes, tank setpoints, and priority settings.

Domestic Hot Water Operation

Instructions for operating domestic hot water using 10K ohm sensor or field-supplied aquastat.

Cascade Operation

Cascade Operation Settings

Parameters for configuring multiple boilers in a cascade, including emergency mode and boiler addresses.

Cascade Operation - Set-up of Boilers

Step-by-step guide for connecting and configuring boilers for cascade operation, including managing boiler setup.

Cascade - Start Sequence

Details the sequence for starting boilers in a cascade based on system temperature and setpoints.

Cascade - Stop Sequence

Explains the process for stopping boilers in a cascade based on power levels and system temperature.

Start-up & Commissioning Settings

Cascade Quick Set-Up