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The sequencing system will determine the maximum power output available if the lowest priority
firing boiler was turned off. If that is more than what is currently needed PLUS the OFF headroom,
the OFF delay will be initiated. The OFF delay will count-down all the while the above condition is
true. At the end of this delay time, that last boiler will be modulated to low fire then switched off. The
other boilers modulated up to compensate.
Restore Procedure
To restore NXTSD104 back to 6000 controller mode:
Press on unit button top right hand corner of NXTSD104.
Select Ethernet.
Select Ethernet Button to Disable Plant Master.
Restoration complete.
WARNING:
Before enabling the “Sequencing” button, be certain that
all parameters in the various boiler and header sections are correct and
make sense. Enabling sequencing will immediately take control of all
connected boilers and, should the parameters be incorrect, may shut boilers
There are two settings relating to when the system brings boilers OFF :
- OFF headroom / deadband (power), and
- OFF delay (seconds).
