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Option 12.1 - Setpoint 1 low limit control value (0 – 999 / 00.0 – 99.9 / 0.00 – 9.99)
Option 14.1 - Setpoint 2 low limit control value (0 – 999 / 00.0 – 99.9 / 0.00 – 9.99)
If the controlled shutdown triac is off, this parameter defines the highest measured value at which the
triac will be switched on.
The parameter may be adjusted if the following conditions exist:
•
The unit is in set-up or commission mode.
•
Option 12.0 / 14.0 is not set to zero.
•
The appropriate setpoint is selected.
Option 12.2 - Setpoint 1 high limit control value (0 – 999 / 00.0 – 99.9 / 0.00 – 9.99)
Option 14.2 - Setpoint 2 high limit control value (0 – 999 / 00.0 – 99.9 / 0.00 – 9.99)
If the controlled shutdown triac is on, this parameter defines the lowest measured value at which the
triac will be switched off.
The parameter may be adjusted if the following conditions exist:
•
The unit is in set-up or commission mode.
•
Option 12.0 / 14.0 is not set to zero.
•
The appropriate setpoint is selected.
Option 12.3 - Setpoint 1 measured value low alarm (0 – 999 / 00.0 – 99.9 / 0.00 – 9.99)
Option 14.3 - Setpoint 2 measured value low alarm (0 – 999 / 00.0 – 99.9 / 0.00 – 9.99)
If the measured value falls below the value of this parameter and option 12.0 / 14.0 is not set to zero,
the setpoint low alarm will be activated. For the alarm to be active, options 16.1 - 16.3 must be set
such that the setpoint low alarm triggers a digital output.
The parameter may be adjusted if the following conditions exist:
•
The unit is in set-up or commission mode.
•
Option 12.0 / 14.0 is not set to zero.
•
The appropriate setpoint is selected.
Option 12.4 - Setpoint 1 measured value high alarm (0 – 999 / 00.0 – 99.9 / 0.00 – 9.99)
Option 14.4 - Setpoint 2 measured value high alarm (0 – 999 / 00.0 – 99.9 / 0.00 – 9.99)
If the measured value rises above the value of this parameter and option 12.0 / 14.0 is not set to zero,
the setpoint high alarm will be activated. For the alarm to be active, options 16.1 - 16.3 must be set
such that the setpoint high alarm triggers a digital output.
The parameter may be adjusted if the following conditions exist:
•
The unit is in set-up or commission mode.
•
Option 12.0 / 14.0 is not set to zero.
•
The appropriate setpoint is selected.
Option 12.5 – Setpoint 1 warming limit (0 – 999 / 00.0 – 99.9 / 0.00 – 9.99)
Option 14.5 – Setpoint 2 warming limit (0 – 999 / 00.0 – 99.9 / 0.00 – 9.99)
If the boiler’s measured temperature/pressure is below this limit, the burner will be held at low fire.
This low fire hold may be overridden using manual modulation mode.
Options 15.1 and 15.2 - Auxiliary input functions (0 – 6)*
WARNING: If an auxiliary input is set to provide a fault mute facility, the “switch” to which
it is connected to must be local to the burner.
Auxiliary inputs 1 and 2 (terminals PC15 and PC16 respectively) may be configured to perform a
variety of different functions.
Option parameter 15.1 determines the function of auxiliary input 1, and option parameter 15.2 deter-
mines the function of auxiliary input 2.
