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Building Technologies Boiler Sequence Controller RMK770 CE1P3132en
HVAC Products 7 Boiler control 23.04.2009
7.13 Boiler faults
If a boiler initiates lockout, it is shut down until the fault is rectified.
A boiler is considered faulty if one of the following faults occurred:
• Fault of burner
• Fault of boiler pump
• Fault of shutoff valve (no checkback signal)
• Maximum flue gas temperature exceeded (if plant stop is required)
• One of the 3 binary fault inputs reports a fault (if plant stop is required)
• Faulty boiler temperature sensor
Main menu > Commissioning > Extra configuration > Boiler … > Inputs
Operating line Adjustable values / remarks
Checkb signal burner
Fault burner
[Boiler pump] overload
[Boiler pump B] overload
Flow signal pump
Checkb sign shutoff valve
Fault input 1
Fault input 2
Fault input 3
The normal position of the fault input can be parameterized at the respective terminal.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Inputs
Operating line Range Factory setting
Normal position Open / Closed Open
A burner fault can be signaled by the burner fault input, or it can be generated when
there is no burner checkback signal from the controller.
The waiting time for the burner’s checkback signal can be adjusted (signal delay).
If there is no checkback signal from the shutoff valve, the boiler is considered faulty
also. The waiting time for the checkback signal can be adjusted. If there is no check-
back signal on completion of the waiting time, a fault status message is delivered.
It can be selected whether or not crossing of the maximum flue gas temperature shall
lead to a fault with boiler stop.
There are 3 binary fault inputs available which, with the default parameters, are used
for water shortage, high-pressure and low-pressure.
But it is also possible to use other fault text.
Depending on the kind of fault, the fault status signal delay, the fault acknowledgement,
the priority and/or the effect can be parameterized.
For fault inputs 1, 2 and 3, it is also possible to enter fault text. For details about the
meaning of these settings, refer to chapter 13 “Function block “Faults“”.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler … > Fault settings > Fault Burner
Operating line Range Factory setting
Fault acknowledgement None / Acknowledge /
Acknowledge and reset
Acknowledge
Normal position of
fault input
Fault burner
Fault shutoff valve
Maximum flue gas
temperature
Binary fault inputs
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