TM 5-3895-374-24-2
The following is the normal cycle for the indicating lights and the programmer message display
from the time the temperature controller calls for heat until the heater is in normal "run" mode.
OIL OPERATION
TIME (SECONDS)
DISPLAY MESSAGE
INDICATING LIGHT(S)
0
Purge nn*
Heat demand, limit circuit**
60
PTFI
Ignition, main fuel valve
60 - 70
PTFI Flame signal XX
Ignition, main fuel valve
70
MTFI, Flame signal XX
Ignition, main fuel valve
80
Flame signal XX
Main fuel valve
After Run Period
Post purge nn
None
Idle
Off
None
GAS OPERATION
TIME (SECONDS)
DISPLAY MESSAGE
INDICATING LIGHT(S)
0
Purge nn
Heat demand, limit circuit**
60
PTFI
Ignition
60 - 70
PTFI Flame signal XX
Ignition
70
MTFI Flame signal XX
Ignition, main fuel valve
80
Flame signal XX
Main fuel valve
After Run Period
Post Purge nn
None
Idle
Off
None
* nn above denotes the number of seconds since the start of the cycle.
** Heat demand and Limit Circuit lights will remain illuminated during entire run period. If these
lights are not illuminated and the burner will not operate refer to Section 9:
HEATER TROUBLESHOOTING.
XX denotes the flame signal strength. Anything greater than 10 is normally acceptable.
(page 3 - 945)
