2 Options & Parameters
Mk8 MM Manual Page | 55
Opt. # Default Range Description
For setting 1, there will only be no pre-purge if the burner has recycled due
to meeting operational temperature/ pressure, and the system has gone
through VPS checks successfully. If the burner has a lockout, or is
restarting after a lockout has been cleared, then the MM will force a pre-
purge. No pre-purge is only available when the fuel is set to gas.
BC: Maximum Allowed UV Self-Check Errors
The MM will test the flame detection of self-check UV scanner at a time
interval, set in option/ parameter 142, and will generate a lockout if it has
more errors than set in this option. See options/ parameters 110 and 122.
This expansion feature will need to be unlocked to enable first out
interlock. For setting 1, all of the first outs will be tied to burner safety stat
circuit. They will be automatically set for active low, and then can be
selected for non-recycle or recycle. Please see expansion option 110.
BC: Air Pressure Error Window
This air pressure error window is only active during modulation; the burner
will lockout if the air pressure is outside of this window.
0 mbar – 30.0 mbar (0” WG – 12.040” WG)
BC: Air Pressure Sensor Type
For setting 0, and external air pressure switch must be wired to terminal
54.If a reset of voltage is not detected within 2 minutes on terminal 54
during the ‘Wait for Air Switch’ phase before running to purge, a lockout
will occur. For setting 1, the air pressure sensor will look for zero air
pressure in the ‘Zero Air Sensor’ phase before running to purge. Setting 2
includes the checks made for settings 0 and 1.
Autoflame air pressure sensor
Autoflame air pressure sensor and air switch on T54
BC: Air-Proving Pressure Threshold
This is the minimum air pressure that must be detected by the MM during
normal firing and during purge when option/ parameter 141 is set to 0,
when using an Autoflame air pressure sensor. See parameter 43 for air
0.7 mbar – 120.0 mbar (0.281” WG – 48.176 “WG)
Value 10 = 0.401 “WG (1.0 mbar)
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