D.4.B.1 Rotation Setup; D.4.C Redundancy - Bradford White OmniTech BONH1250 Installation And Operation Instructions Manual

8.D.4.b.1 Rotation Setup
There are two options for cascade Rotation Setup, Rotation 'Mode':
1. Run Time
Recurrence
2.
In the Run Time Mode, you can adjust only the
Rotation Run Time Hours. This chooses which
unit will fire first based on run time hours.
8.D.4.c Redundancy
To navigate to the Cascade Redundancy Screen, touch the Cascade Icon on the Configuration Screen, then touch the
Redundancy Icon on the Cascade Configuration Screen.
The Cascade Redundancy Screen allows the selection of one of three options for redundancy in cascade systems.
These options are:
• Boiler Internal Set Point – In a cascade configuration, upon loss of communication with the lead unit, the lag units
will continue to operate in the same manner as when the communication stopped. For example, if a lag unit was
firing to satisfy a cascade heat demand, it will continue to satisfy the heat demand upon loss of communication with
the Leader.
• Redundant Lead – In a cascade
configuration, upon loss of
communication with the lead unit,
a second unit will assume lead
responsibilities. This requires the 2nd
lead to have a manual address of 2 and
a 2nd system sensor installed at that
unit.
• Disable Redundancy – In a
cascade configuration, upon loss of
communication with the lead unit, lag
units will no longer satisfy the cascade
heat demand.
Note: The redundant lead unit should have a system sensor and be connected to the system pump (if / where applicable).
If the lead boiler maintains communication with the lag units, but loses connectivity with the system sensor, the
cascaded units will run at the calculated set point (CSP) provided by the lead unit, but will control to their individual
outlet sensor. In this mode, the firing rate can be limited using the Backup Mode Max Lag Power parameter.
C O N F I G U R A T I O N
For Recurrence Mode, there are two parameters:
1. Time of Day. You can adjust the hour and minute
of the day for rotation.
2. Every X Days. You can select how many days you
want to wait until rotation, and then it will rotate at
the hour and minute of the day previously selected.
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