Concert Boiler Control Instruction & Operation Manual
Page 3 of 68
Introduction
Overview
Boiler Control
The Concert Boiler Control (Control) contains
features and capabilities which help improve
heating system operation, and efficiency. By
including unique capabilities, the Control can do
more, with less field wiring, and fewer aftermarket
controls and components
– improving the
operation of both new and replacement boiler
installations.
Advanced Touch Screen Display
Boiler status and setup selections are available
from an easy to use, full color, Touch Screen
Display. 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. Operation evaluation and problem-solving
is enhanced by historical capability including
graphic trends, lockout history records, as well as
boiler and circulator cycle counts and run time
hours.
Archives
Evaluation, optimization, and troubleshooting are
enhanced by the collection of an operational
record. Operation history is provided by major
variable historical trending, time and day stamped
alarms, lockout history, cycles, run hours, and
boiler loading profiles. These tools may be used
on site our downloaded to a thumb drive for review
off site.
Advanced Modulating Control
The Control 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 Control
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 Control also
utilizes
boiler
return
water
and
flue
gas
temperatures to adjust fan speed.
Built-in Safety Control
The Control includes safety controls designed to
ensure safe and reliable operation. In addition to
flame safety controls the Control includes supply
water temperature, differential water temperature,
and stack temperature safety limits, as well as
stepped modulation responses. Boiler modulation is
adjusted when required to help avoid loss of boiler
operation due to exceeding limits. Additionally, the
Control monitors the safety limits and displays
cause of boiler alarm trip and start delay.
Outdoor Air Reset
When selected the active setpoint is automatically
adjusted based on outside air temperature, time of
day, and length of demand (boost) settings.
Outdoor air
“reset” setpoint saves fuel by adjusting
the water temperature of a heating boiler lower as
the outside air temperature increases.
Auxiliary Equipment Control
The Control may be used to sequence the domestic
hot water, boiler and system circulators, or fresh air
damper. Circulators are automatically run for a 20
second exercise period after not being used for
longer than 7 days. Circulator exercise helps
prevent pump motor shaft seizing.
Energy Management System (EMS) Interface
The control accepts a 4-20mAdc input from the EMS
system for either direct modulation rate or setpoint.
A factory configured RS485 Modbus interface is
available for Energy Management System (EMS)
monitoring or control. Additionally the boiler Multiple
Boiler Sequencer Peer-To- Peer Network may be
used at the same time the EMS is monitoring and
providing setpoint over the Modbus network.
Multiple Boiler Peer-To-Peer Network
The Control 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 communication. The peer-to-peer network is
truly
“plug and play”. Communication is activated by
simply connecting a RJ45 Ethernet cable between
boilers. The Control provides precise boiler
coordination by sequencing boilers based on both
header water temperature and boiler modulation
rate. For example, the lead boiler can be configured
to start a lag boiler after operating at 50%
modulation rate for longer than an adjustable time.
The boilers are modulated in
“unison” (parallel)
modulation rate to ensure even heat distribution.
