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X. Sage Boiler Control
A. INTRODUCTION: The intent of this section is to briefly
summarize the controllers capabilities, familiarize the user
with its basic features and to list factory supplied default
settings. Read the additionally supplied Factory Instruction
Manual for the SBC to learn more about the controllers
features and capabilities.
1. Sage Boiler Control Overview
The Sage Boiler Control (SBC) is a complete boiler
monitoring and automation system. The SBC pro-
vides advanced boiler modulation, operating control,
diagnostics, multiple boiler lead-lag and auxiliary
device control. The SBC provides advanced control
features in an easy to use package.
2. Flexible, Field Selectable Control.
Control modules, water system, boiler auxiliary and
modulating lead/lag control features are menu se-
lectable without the need for external programmers,
laptops or downloads. Every boiler is shipped with
factory defaults that make field menu selections un-
necessary unless you are applying additional control
features.
3. Boiler Monitoring and Diagnostic Displays
The SBC's two line by sixteen character LCD
display may be used for monitoring boiler inlet and
outlet, remote system and outside air temperatures,
modulation rate setpoint and modulating percent and
mixing valve demand percent. Additionally, the dis-
play automatically presents boiler sequence messag-
es, alarms, hold and lockout messages. A diagnostic
menu is included that provides the last 10 alarm
messages and boiler inlet temperature alarm history.
Boiler inlet temperature alarm history includes time
and date, the lowest inlet temperature reached and
the amount of time the water temperature dropped
below the alarm setpoint.
4. Modulation Rate and On/Off Modes
The SBC may simply control boiler modulation
and on/off output based on the boiler water out-
let temperature and an operator adjusted setpoint.
However, using parameter selections, the SBC
allows the boiler modulation and on/off output to
respond to remove system water and outside air
temperatures, Domestic Hot Water Priority (DHWP)
input or Energy Domestic Hot Water Priority (EMS)
modulation rate demand, remote setpoint or remote
start/stop commands. Parameter selections of remote
system water temperature and remote mode deter-
mining the choice of one of six different control
modes.
5. Advanced Availability
The above control modes are menu selectable op-
tions. However, if a selected sensor rails, the SBC
automatically changes to a control mode that will
allow continued automatic operation of the boiler.
For example, in the event of a remote system tem-
5
(SBC
)
TM
TM
perature sensor failure, the SBC will automatically
switch to boiler outlet temperature sensor based
control.
6. Outdoor Air Reset
When selected the modulation rate setpint is auto-
matically adjusted based on outside air temperature.
Outdoor air "reset" setpoint saves fuel by adjusting
the water temperature of a heating boiler lower as
the outside air temperature increases.
7. Warm Weather Shutdown (WWSD)
Some boilers are used primarily for heating build-
ings, and the boilers can be automatically shut-
down when the outdoor air temperature is warm.
When outside air temperature is above the WWSD
setpoint, this function will prevent the boiler, boiler
pump and/or the system pump from starting.
8. Domestic Hot Water Priority (DHWP)
Some boilers are used primarily for building space
heating, but also provide heat for the domestic hot
water users. When the outdoor temperature is warm,
the outdoor reset setpoint may drop lower than a
desirable domestic hot water temperature. When
enabled and a DHWP contact input is detected, the
hot water setpoint is adjusted to be greater than a
field adjustable DHWP Setpoint.
9. Water Side Control Outputs
In order to maximize the life and availability of a
hot water system it may be desirable to automate
mixing valves, boiler pumps, system pumps, and
standby system pumps. The SBC makes this type of
automation totally integrated and cost effective. The
control of these devices is field selectable through
simple yes/no menu selections.
10. Combustion Air Side Control Outputs
Boiler room combustion air dampers (fresh air
dampers) and vent inducer control outputs are field
selectable options.
11. Peer-To-Peer Network
The SBC includes state-of-the-art modulating lead-
lag sequencer for up to eight (8) boilers capable of
auto rotation, outdoor reset and peer-to-peer com-
munication. The peer-to-peer network is truly "plug
and play". Communication is activated by simply
connecting a RJ11 telephone line between boilers.
The SBC provides precise boiler coordination by
sequencing boilers based on both remote system
water temperature and boiler modulation rate. For
example, the lead boiler can be configured to start
a lag boiler after operating above 90% modulation
rate for longer than an adjustable time. The boilers
are modulated in "unison" (parallel) modulation rate
to ensure even heat distribution.
12. Modbus Communication Interface
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