Overview of Primary Product

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SYSTEM FAULTS
A system fault (illuminated by the fault LED on the logic cards) prevents gas ignition but does not
lock out the system. System fault conditions are as follows:
1. If a flame is detected out of sequence, which may be caused by:
a) a faulty scanner
b) electrical interference on the sensor leads
c) a flame exists in the burner due to a gas leak or other condition.
2. Air flow switch closed before start-up.
System Lockout Conditions
A system lockout will occur (illuminated by the alarm LED on the logic card) for any of the follow-
ing conditions:
1. Air failure–loss of combustion anytime during the operational cycle.
2. Pilot flame fail–loss of flame during the trial for pilot ignition period.
3. Main flame fail–loss of flame during the main burner trial for ignition.
4. Main fuel valve–open after cycle shutdown or before start-up with interlocks closed.
5. Unmatched burners–the number of flame sensing modules installed (MB-600PF or
MBPF-100S) does not match the number selected on the DIP switches (see “S6 DIP
Switch Settings” on page 9).
6. Relay fail–failure of Multi-Burner Control internal relays.
7. Low fire fail–low fire switch open prior to trial for ignition.
8. High fire fail–high fire switch is not closed at the end of high fire purge.
9. Flame fail–loss of flame after main flame has been established.
10. If no purge time is set (see “S2 DIP Switch Settings” on page 7).
11. Wiring error which puts external voltage on any of the output terminals.
12. Welded internal contacts or other malfunctions in the Multi-Burner Control.
13. Auxiliary input fail–loss of input voltage to any of the four “AUX” terminals after the limit
input is made.
14. A system fault condition that lasts longer than 30 seconds.