© 2023 Carrier 53
LOCKOUTS
When a safety shutdown occurs, the control indicates through the LED’s the reason for the lockout. If equipped, it
displays a lockout message and when in the cycle the lockout occurred. The alarm circuit (Terminal “A”) is
energized. The non-volatile memory remembers the status of the control even if a power failure occurs. By
momentarily depressing and releasing the reset button on the control or the display keypad, the control can be reset.
The button must be held down for one second and then released. Very little force is required to do this. Do not press
hard.
SAFETY SHUTDOWN
1. If the running interlock circuit (3-P or L1-P on YP148/YP184) does not close, the control locks out and the
blower motor is de-energized.
PROVING 3-P (L1-P on YP148/YP184) CLOSED
On cycle start the BurnerLogix proves the 3-P (L1-P on YP148/YP184) running interlock circuit closed in the
following manner:
1. At cycle start (L1-3 closes), if the M-8 damper switch is closed, the pre-purge period begins and the
BurnerLogix waits up to 20 seconds for the 3-P (3-P or L1-P on YP148/YP184) circuit to close.
2. At cycle start (L1-3 closes), if the M-8 damper switch is open, the BurnerLogix waits up to 10 seconds for the
3-P (3-P or L1-P on YP148/YP184) circuit to close after the M-8 circuit closes. Pre-purge timing begins after the
M-8 closes circuit closes.
2. If the fuel valve end switch or proof of closure switch connected to Terminal 13 opens during
standby or purge, the control locks out.
3. If the running interlock circuit ((L1-P on YP148/YP184)) opens during a start-up or firing period, or
valve proving sequence, all fuel valves will be de-energized, and the control locks out.
4. If the proven high fire circuit (M-8) has not closed after a ten (10) minute “Hold” period at the
start of prepurge, the control locks out.
5. If the low fire start circuit (M-D) has not closed after a ten (10) minute “Hold” period at the end
of prepurge, the control locks out.
6.
a.) If PROVE 3-P OPEN (PROVE L1-P OPEN on YP148/YP184) is selected as YES, and the 3-P (L1-P on
YP148/YP184) circuit is closed at the start of the operating cycle, the control holds for thirty (30) seconds
waiting for the 3-P (L1-P on YP148/YP184) circuit to open. If, after thirty (30) seconds, the 3-P (L1-P on
YP148/YP184) circuit does not open, the control locks out
b.) If PROVE M-8 OPEN is selected as YES, and the M-8 circuit is closed at the start of a cycle, the control
will hold for thirty (30) seconds for it to open. If, after thirty (30) seconds, the M-8 is still closed, the control
locks out.
c) If PROVE M-D OPEN is selected as YES, and the M-D switch is closed at the end the high fire purge
cycle, the control holds for thirty (30) seconds for it to open. If, after thirty (30) seconds, the M-D is still closed,
the control locks out.
d) If PROVE M-D TFI is selected as YES, the low fire start switch located between terminals M-D must be
closed during PTFI and MTFI.
7. If pilot flame is not detected after the pilot trial for ignition period, the pilot valve and ignition
transformer is de-energized, and the control locks out on safety.
8. If main flame is not detected during the main flame trial for ignition period for one FFRT, all
fuel valves are de-energized, and the control locks out on safety.
9. If the main flame fails during a firing cycle, all fuel valves are de-energized within 1 FFRT and
the control locks out on safety.
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