DJM2.4 MANUAL
22 Oct 00 R2
After setting up the low fire, adjust the curve matching pot as described in points 8 and 9
above. Need of a resistor on the valve as described in the text above for the high
turndown burner is greatly reduced on the standard burner.
Pilot Set Up for DJ Series Standard Burners
Do not set up pilot until you are confident the burner is operating with correct air/fuel
mixture. (Set up high fire first.)
1. Ensure the pilot tube is free of debris and blockages.
Note that there is an orifice where the pilot gas line is connected to the pilot air tube. This
orifice is sized to the BTU and altitude requirements of the burner. It must be free of dirt
and burrs to operate properly. If there are problems lighting or proving the pilot that do
not appear to be related to the ignition/flame supervision device then carefully clean and
inspect this orifice from both the gas tube and air tube side. If a burr exists it is usually
best to remove it by pushing it into the air tube from the gas tube with a small pin or
orifice drill, then break it off by inserting a object into the air tube.
2. On standard round burners, set pilot as per the following procedure.
Install a 10,000-ohm resistor in series with the flame rod circuit.
Connect a DC voltmeter across the resistor.
The reading will be in millivolts if your meter does not auto scale.
Connect a manometer to the pilot line.
Run the burner on main flame for a few minutes to have the burner plate warm.
Leave the pilot on but turn the main gas off. (You will have to jumper the DJM2.4
terminals PV1 and PV2 to do this and remove the wire from terminal VFB24 or VFB120
depending on the gas valves voltage.)
As low pilot gas pressure can damage the ceramics, reduce the pilot gas pressure to
2.5 inches and immediately return it to a higher pressure. This is to ensure the pilot
gas regular responds properly.
Adjust the pilot valve regulator to a pressure in excess of 4.5 inches pressure.
Slowly reduce the pilot gas pressure while watching both the pressure and the
voltmeter. The millivolt reading should be increasing. At the point where it begins to
fall you should stop reducing pressure and return to the high spot.
NOTE: That the fall in pressure could only be as small as a couple of millivolts. This
point should be between 4.5 and 2.5 inches pilot pressure.
NOTE: That some smaller burners DJ40 and smaller, may need to have a screw
placed through the pilot air tube to reduce the amount of air to the pilot.
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