Alpine Sage2.1 Control Overview

Burnham Sage2.1 Boiler Control System (SBC2.1) – Overview (con’t)
U.S. Boiler Company – August, 2010 Page 5 of 8
2. Stand-Alone Back-up : If the Master Sage 2.1 Control is powered down,
disabled, or loses communication with connected boilers, individual boilers
can be connected to resume control as stand alone boilers.
3. Slave Boiler Rate Adjustment : Each slave boiler continues to monitor supply,
return, and flue gas temperatures and modifies the Sequence Master’s firing
rate demand to help (a.) avoid individual boiler faults, (b.) minimize boiler
cycling, and (c.) operate boiler(s) at peak efficiency.
4. Slave Boiler Status Monitoring : The Sequence Master constantly monitors
slave boiler status and will automatically skip over disabled boilers when
staging additional slave boilers.
- Equalized Run Time/Customized Sequences: To equalize the run
time the sequencer automatically rotates the lead boiler after 24 hours of run time.
Normally, boilers are started in boiler numerical order (1,2,3,...) and stopped in
reverse order (...3,2,1). However, custom sequences may be established to
optimize the response. For example, a large boiler may be selected to run first
during winter months and then selected to run last for the remainder of the year.
- Innovative Condensing Boiler Control: The Sequence Master reduces
firing rates to ensure peak operating efficiency. Lowered firing rates reduce stack
temperatures and maximize the Alpine Boiler’s ability to condense flue products
thus saving fuel. In order to maximize fuel efficiency, the Sage2.1 maintains a
lowered modulation rate until the last boiler is started. At this point, the modulation
rate is released to allow boilers to modulate as required to meet heat load.
- Optimized Boiler Modulation: The Sequence Master develops a firing rate
demand based on it's set point and sensed temperature. This demand is used as a
firing rate by each boiler. Each boiler continues to monitor boiler supply
temperatures along with return and flue gas temperatures and then modifies the
modulation rate to minimize boiler cycling and provide heat to the building
efficiently.
- Multiple Demands: The Sequence Master responds to Central Heat, DHW
and frost protection demands similar to the stand-alone boiler. When the Indirect
Water Heater (IWH) parameter is set to "Primary Piped" the Sequence Master
drives the “networked” boilers to the DHW setpoint. When "Boiler Piped" is
selected, the individual Slave boiler responds to the DHW demand. The “Primary
Piped” option allows all boilers to be staged for a DHW demand, maximizing
recovery, and providing back-up for DHW with multiple boilers available to respond
to a demand.
- DHW Two-Boiler Start: When the Indirect Water Heater (IWH) parameter
is set to "Primary Piped" and the DHW Two Boiler Start parameter is enabled two
boilers are started without delay in response to a DHW call for heat. This feature
allows rapid recovery of large DHW demands and multiple Indirect Water Heaters.