Alpine Sage2.1 Control Overview

Burnham Sage2.1 Boiler Control System (SBC2.1) – Overview (con’t)
U.S. Boiler Company – August, 2010 Page 4 of 8
• The Sage2.1 Sequencer provides the following:
- Sage2.1 Sequencer Master:
A single Sage2.1 Boiler Control is used to control up
to eight (8) Sage2.1 equipped boilers by enabling its Sequencer Master. The call for heat,
outdoor and header sensors, and pumps are wired to the master enabled Sage2.1
Controller.
- Multiple Firing Rate Sensor Options: The Sage2.1 has multiple firing rate
sensor options. Some piping arrangements are better suited to select the firing rate
of the boiler based on the header temperature, rather than the boiler supply
temperature. Multiple boiler systems using the Sage 2.1’s internal sequencer require
the use of a header sensor. This feature enhances the versatility of the Alpine boiler
by integrating into existing systems without requiring additional controls.
- Lead/Slave Boiler Sequencing: One boiler is a “Lead” boiler and the
remaining networked boilers are “Slaves”. When demand is increasing, the Lead
boiler is the first to start and the Slave boilers are started in sequential order
(1,2,3,...) until the demand is satisfied. When demand is decreasing, the boilers are
stopped in reverse order which helps equalize run time hours on all boilers.
- Advanced Boiler Sequencing: Both header water temperature and boiler
firing rate percentages are used to start and stop the networked boilers. In order to
minimize temperature deviations, the Sage2.1 control adjusts the number of boilers
running based on the firing rate. This combination allows the boilers to anticipate
slow load changes before they disrupt water temperature yet still respond quickly to
sudden load changes. These special sequencer features help reduce energy-wasting
system temperature swings and the resulting unnecessary boiler cycling. Additionally,
the control monitors boiler
lockout status and
automatically skips over
disabled boilers. The
Sequencer will operate
the boilers as efficiently
a possible by lowering
the firing rates of the
staged boilers in unison
as additional stages are
brought on.
- Improved System Reliability: The Sage 2.1 Control contains several
features designed to ensure continued boiler operation in the unlikely event of a
sensor or control failure:
1. Backup Header Sensor : In the event of a header sensor failure the lead
boiler’s supply sensor is used by the Sequence Master to control the firing
rate of staged boilers. This feature allows continued Sequencer control in the
event of a header sensor failure.
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