2 Options & Parameters
Mk8 MM Manual Page | 56
Opt. # Default Range Description
BC: Terminal T80 Function
Setting 1 allows an additional safety check on the valves and damper to
ensure that they are in the correct position for start/low fire. See Valves
and Servomotors manual for information on setup and wiring.
BC: Terminal T81 Function
For setting 1, terminal 81 acts as a line voltage input for a mechanical
proving switch. The switch must be made when the air channel servo is at
the purge position and it must remain made for the whole duration of the
purge phase otherwise a lockout is generated. This input must also not be
made while not at purge position. For setting 2, terminal 81 acts as purge
pressure proving switch input. The switch must be made continuously for
the
whole duration of the purge time. If it drops out, the purge timer
restarts once the signal is made again. It must also not be made before
the blower motor starts to confirm the input is working correctly. If this
input comes on during the relay tests a lockout is generated. Option 158
adds an optional time limit for the purge pressure proving to be made.
BC: Delay to Purge (T52) Timeout
An input on terminal 52 is required to indicate the system is ready to move
toward the purge phase. If the MM does not see this input for 1 second
within this time set, then a lockout will occur. Setting 0 will disable this
timeout, so the MM would sit indefinitely in delay to purge.
BC: Purge Pressure Proving (T81) Timeout
If option/parameter 155 is set to 2, then the system will lockout if the purge
pressure is not proved within the specified time. Setting to 0 will disable
this timeout, so the MM will be in the purge phase indefinitely waiting for
the pressure proving signal to be received on terminal 81.
BC: Clear Commissioning Data
Clear all commissioning data, options and parameters
Reset all options to default values
Reset all parameters to default values
Reset all safety options and parameters to default values
Reset all expansion options to default values