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Page 92
Section 12
TROUBLESHOOTING
12.1
Potential Setup and
Synchronization Problems
Because the Brute uses a sophisticated control
system, it can constantly perform a series of self-
checks. For example, as a burner is lighted, the
controller checks each stage of the purge and
ignition process. If part of the process does not
happen on time, or takes too long to occur, the
controller stops the process. We have detailed
these self-checks in the section on "Operating
Sequence."
Two of these self-checks are particularly important:
• Controller synchronization
• Flap valve status
If the control system is not satisfied with the results
of both of these checks, it will not allow the system
to run. Sometimes the reason for this may not be
obvious at first – that's why we are describing them
at the start of this section on Troubleshooting.
Operator
interface
Fig. 122 – Lead/Lag Arrangement in a Multiple-Boiler Installation
Boiler 1
Boiler 2
Addr
Addr
Addr
Addr
1
2
3
Lead Lag
Slave 3
Master and
Slave 1
Slave 4
Slave 2
12.1.1
Controller Synchronization
On a multiple-boiler installation, the individual boiler
controllers are arranged in a "daisy chain" using
a Modbus connection, with the Secondary control
of one boiler connected to the Primary control of
the next boiler. Up to four boilers, with up to eight
controllers, can be connected in this way. See Fig.
122.
As part of the setup process, each of these
controllers must be given a unique address. (For
details, see Section 9 - Installation and Setup." The
controls must be set up and addressed correctly
before the Modbus wiring is completed. If the wiring
is attached before the Modbus control addresses
are changed, there will be multiple controls with the
same address, and the system will not work.
When a Lead/Lag system is first powered up, the
controller acting as the Lead/Lag Master goes
through a "synchronization" process. During
synchronization, the controller establishes
communications with each of the Slave controllers
via the Modbus link. The Slave controllers download
some setup parameters and operating history
information. (On a system with several boilers, this
phase can take several minutes.) If the Master
cannot establish communications with one of the
Slaves, it triggers a Hold or Lockout.
Boiler 3
Addr
Addr
Addr
4
5
6
Slave 5
Slave 7
Slave 6
B
W
RADFORD
Boiler 4
Addr
7
8
Slave 8
HITE
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Table of Contents
Troubleshooting
