A G-TRAC2 MANUAL
General Manual Revised: 03/15/99
The low fire air is meant to be set by an initial mechanical adjustment followed by fine-tuning on the low
fire air pot. For the initial factory adjustment, place the low fire air pot to mid-scale. Mechanically adjust
the damper blade until the O
2
is between 15 and 18% then use the pot to fine tune the O
2
readings.
Record the DC volts across terminal PA (+) and PL.
NOTE: At no time should the air damper operator be in the fully closed position. This is evident, by examining the
damper operator mechanical stops or by reading the PA to PL voltage. It should never read below .3 volts.
This is to ensure the operator is always in its control range.
7. Adjust the unit to about firing rate (about 2.5 VDC across terminals “PG and PL”). Check the O
2
. The reading
should be between 13 and 17.5 %. If it is closer to 13%, there is an increased chance of condensation. Closer
to 17% reduces condensation.
For factory set up, if proper O
2
readings cannot be attained, a new air and/or fuel ratio curve must be
selected. Do not change setting while in the field. Contact the factory. Once a different curve is selected
you must repeat the factory set up procedures.
NOTE: Do not change air or fuel curves without contacting the factory. If the air or fuel curves are changed both
the high and low fire must be rechecked and the voltages recorded on a new label.
8. Turn off the service mode dipswitch A-5 and ensure you have recorded the set up voltages on the unit.
Record the dipswitch settings, selected pot settings, low fire air, high fire air, and low gas voltage. This will
enable faster and easier change-out of parts in future, as noted in section XXII.
NOTE: If large low fire gas or air adjustments are made with their respective pots, the high fire settings should be
rechecked. After set up is complete ensure dipswitch A-5 is turned off.
Propane Gas
Combustion set up for propane fuels for either the high turndown or the standard burner are similar to the above.
The only modification suggested may be to increase the oxygen settings by 1 to 1.5% above those for natural
gas.
Due to the quantity of fuel that can be drawn off a propane tank, it is often necessary to equip a propane fuel
system with a vaporizer. The usual sign that a vaporizer is required is that the units fuel supply falls off as the line
"freezes". The user usually observes:
• Lack of temperature rise;
• After turning the unit off for awhile the fuel line thaws and restarting it, all appears to be normal.
High turndown burners operating on propane fuel will generally exhibit the following:
High Fire At 3.5% O
2
will appear yellow from behind the burner, however, if you could view it from the other
side of the burner you would see blue as the flame lengthens out.
Low Fire At 16% O
2
the flame will likely be yellow. At 17% O
2
the flame will likely be blue and yellow.
Inlet/Manifold Pressure Settings
Manifold pressure settings that the unit was tested and clocked at in the factory are recorded on the unit rating
plate. Any attempt to clock a unit in the field should be done with care. Corrections for density (altitude and station
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