Troubleshooting The Gas Burner - Southern Pride MLR-150 Owner's Manual

TROUBLESHOOTING THE GAS BURNER

Gas burners require an experienced technician for proper service and adjustment.
If the burner does not appear to be operating properly, DO NOT ATTEMPT TO
ADJUST THE BURNER YOURSELF, but call in a competent service technician.
It is very important to know the sequence of operation when troubleshooting the burner. The below steps de-
scribe the cycle for ignition in the sequence of operation for the burner.
1. The smoker is powered on with the desired cooking temperature set.
2. At a call for heat from the thermostat, 230 volts of power go through the thermostat, the high limit switch,
and on to the burner.
3. The power comes into the burner at the junction box, which is located on top of the blower motor; 230
volts AC go to the primary side of the 24 volt AC step down transformer and to the combustion motor and
the combustion motor comes on.
4. The step down transformer sends 24 volts AC out to the centrifugal switch on the blower motor.
5. When the blower motor is powered up and reaches full speed, the centrifugal switch (located on the end of
the motor) is activated, sending 24 volts through it and on to the ignition control module.
6. When 24 volts reaches the ignition control module, it sends a high voltage spark out to the electrode
(igniter) to light the pilot flame, and at the same time, it sends 24 volts to open the pilot valve on the main
gas valve.
7. After the pilot lights, the electrode (igniter) acts as a flame sensor sending a DC micro amp signal back to
the control module that there is a pilot flame, then the ignition control module sends out 24 volts AC to
open the main valve.
8. The pilot flame lights the flow of gas from the main valve and the burner will fire until the call for heat
from the thermostat has been satisfied, shutting the burner down.
NOTE: The burner is equipped with a ignition module that has a 3-try for ignition sequence.
SYMPTOM
Blower motor does not run
Burner does not fire
Burner sparks, but does not fire
Pilot lights, but burner does not
Pilot lights, but does not stay lit
WARNING:
GAS BURNER SEQUENCE OF OPERATION
WHAT TO DO

Check for 230v present at the blower motor.

Check for 24 volts at the ignition control module.

Clean the centrifugal switch.

Check the condition of the ignition wire.

Clean the electrode and check the spark gap (1/8", 3mm)).

Firebox door must be closed to engage proximity switch.

Check that the high limit is not tripped.

Remove any ash in the burner head.

Check that the gas is turned on.

Check the supply line pressure. (see page 15).

Clean the electrode.

Check for loose wire connection at the valve and control module.

Clean the igniter rod.

Check the igniter-sensor probe and wire.
Copyright 2016 by Southern Pride Distributing, LLC Volume 2
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