29
®
Table 2:
EXPLANATION OF LOGSTAT
Logstat represents the current software module the Flame-Monitor is currently executing. They are
named as close to the logic module the actual burner sequence is in. For instance, in the Flame-Mon-
itor, MPURGE represents High Fire Purge where MPOSTPURGE represents the low fire start
period where the mod motor is sent to the low fire position in preparation for pilot light-off.
MSHUTDWN1 represents the post purge period after a complete cycle or the cool down period after
a lockout.
MIDLE or STANDBY is the period of time where the operating control is open or the control is in
lockout waiting for reset. On instances of false flame during the purge period, the control algorithm
forces the control back to STANDBY until false flame ceases or lockout occurs.
MPREPURGE1 is the period of time prior to PURGE where the control checks the status of the air
flow interlocks or the high fire proving switch (D-8). If either switch is found open, the control will
remain in this state until the respective switch closes or lockout occurs.
MTFI represents the pilot trial for ignition stage of a burner sequence. MTFMF represents the main
trial for main flame period where main fuel is introduced along with pilot and igniter.
MAUTO is the run period of the burner sequence.
MPOSTIDLE and MSHTDWN2 are small periods of time where certain internal tests are conducted
and general cleanup before and after a cycle is performed.
The Flame-Monitor outputs the current displayed message as well as the historical lockout messages
as numbers. The table that follows correlates the message number with the actual displayed test mes-
sage.
LOGIC DISPATCHER
VALUE MODULE
FUNCTION
DEC
HEX
69
45H
MPOSTIDLE
70
46H
MPREPURGE1
Wait for air flow and/or high fire switch to close
71
47H
MPURGE
Open Damper Purge
72
48H
MPOST PURGE
Low Fire Purge
73
49H
MTFI
Pilot Trial
74
4AH
MTFMF
Main Trial
75
4BH
MAUTO
AUTO
76
4CH
MSHTDWN1
Post Purge
77
4DH
MSHTDWN2
Post Purge
78
4EH
MIDLE
Standby
