© 2023 Carrier 41
PTFI 20
FLAME SIGNAL
9. With flame proven at the end of PTFI, the main flame trial for ignition (MTFI) period begins. Terminal 7 is
energized. The BLV512 displays:
MTFI 35
FLAME SIGNAL
Terminal 5 is de-energized 10 seconds later and Terminal 6 is de-energized after another 5 seconds.
10. The firing rate motor is sent to the automatic modulation position (10-11 circuit made) and is under the
command of the proportional controller. The BLV512 displays:
AUTO 40
FLAME SIGNAL
Normal Shutdown
1. When the operating control circuit (L1-3) opens, the main fuel valve is de-energized. The firing rate motor is
driven to the low purge position (10-12 circuit made).
2. Following a 15 second post purge, the burner/blower motor is de-energized.
POST PURGE 0:05
CYCLE COMPLETE
3. The burner is now off and the BLV512 displays:
STANDBY
L1-3 OPEN
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