Operation; Major Features - Burnham Water boiler Installation, Operating And Service Instructions

Xii. Operation
A.

Major Features

1. General
The Sage2.1™ Control provides safety interlocks and
water temperature control. The Sage2.1 simply controls
boiler modulation and pump outputs based on the boiler
water outlet temperature and a contractor adjusted
setpoint. However, using parameter menu selections,
the control system may also respond to header water
temperature and outside air temperatures with Domestic
Hot Water Priority (DHWP), Frost Protection and
Warm Weather Shut Down (WWSD), multiple boiler
sequencer control or Building Automation System
(BAS) firing rate demand, remote setpoint and remote
start/stop commands.
2. Advanced Modulating & Safety Control
The Sage2.1 modulates the boiler input by varying
the fan speed. As the fan speed increases, so does the
amount of fuel gas drawn into the blower. As a result,
a fairly constant air-fuel ratio is maintained across all
inputs. The Sage2.1 determines the input needed by
looking at both current and recent differences between
the measured temperature and the setpoint temperature.
As the measured temperature approaches the setpoint
temperature, the fan will slow down and the input will
drop. The Sage2.1 also monitors boiler return and flue
temperatures. In addition, all other safety controls,
including the optional field installed low water cut-off
and auxiliary safety limits, are connected to external
limits of the Sage2.1. The Sage2.1 uses input from all
of these controls to either shut down the boiler when
an unsafe condition exists or, in some cases, to correct
the problem.
3. Circulator Control
The Sage2.1 control may be used to sequence the
domestic hot water, boiler and system circulators.
Service rated relay outputs are wired to a line voltage
terminal block for easy field connection. Simple
parameter selections allow all three pumps to respond
properly to various system piping arrangements
including either a boiler or primary piped indirect
water heater.
4. Circulator Exercising
Circulators are automatically run for a 20 second
exercise period after not being used for longer than 7
days. Exercise helps prevent pump rotor seizing.
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5. Advanced Touch Screen Display
Sage2.1 LCD Touch Screen Display
a. Boiler Display
Boiler status and setup selections are available
from an easy to use, dual color, LCD Touch Screen
Display. Over one hundred helpful information
screens are provide to explain status information
and setup functions. In the event of a fault condition
the user is guided by "blinking" touch buttons to
Help screens that explain the problem cause and
corrective action. The Sage2.1 uses a combination
of Information and Help screens to guide the user
to proper setup & troubleshooting.
b. Contractor Contact Information Screens
The contractor can insert name, address and phone
information into the Sage2.1 Display. Users are
directed to this contact information in the event of an
alarm or when attempting to adjust parameters.
c. Data Logging
Supply and return temperature, fan speed and flame
current Real Time Graphic Trends allow users
to observe process changes over time providing
valuable diagnostic information. Trends screens
record data for 15 minutes with ten 1.5 minute
divisions. Trends have start & stop buttons to
retain displayed data. Also, Hard Lockout history
records, boiler run time hours and cycle counts for
the boiler and individual circulators are provided.
6. Communication
A boiler-to-boiler communications network allows
connected Sage2.1 Controllers to exchange signals as
required to provide sequencer control.