A G-TRAC2 MANUAL
General Manual Revised: 03/15/99
Before changing a G-TRAC2, if possible you should have the unit in operation and record the following
information so that you may make the change quickly and avoid a time consuming combustion set up. If the
information is already recorded on a label on the unit and the G-TRAC2 is operable it is advisable to recheck the
values.
If you follow the steps below using the recorded values, the burner set up should not change significantly from the
existing G-TRAC2.
On any G-TRAC2 change (if the G-TRAC2 is operable), before disconnecting any of the wiring operate the unit
and record the following information.
Using a DC voltmeter record the following:
1. Set the dipswitches on the new G-TRAC2 to match those on the existing one. There are 3 sets of
dipswitches on the new G-TRAC2. On the top front there is an open set, through the slot under the set
point knob there is another set, and on the latest revision there is a set of dip switches on the back near
the top.
2. Set dipswitch A-5 (on the top set of switches) ON to place the G-TRAC2 into the service mode.
3. Measure and record the following values to at least 1/10-volt accuracy.
4. Take the burner to high fire – record feedback DC voltage across “PL and PA”. Also record the values
on the unit for future reference.
5. Take the burner to low fire – record feedback DC voltage across “PL and PA” _____ and record feedback
DC voltage across “PL and PG” _____. Also record the values on the unit for future reference.
6. With the unit at low fire, turn the unit off.
7. Install the new board.
8. After the new board is installed, turn on dipswitch A-5 to place the new G-TRAC2 into the service mode.
Take the unit to high fire. Adjust the high fire air pot until the voltage across “PL and PA” matches the
value recorded above.
9. Adjust the low fire pot to get the “PL and PG” values recorded above.
10. Take the unit to low fire. Adjust the low fire air pot until the voltage across “PL and PA” match those
recorded above.
11. Recheck the above values. Try to be very accurate. (Less than
1
/
10
of a volt.)
12. If the combustion was correct before it should still be correct.
13. Turn off dipswitch A-5 to put unit into “AUTO” mode.
Changing Gas or Air Operator on G-TRAC2
1. The motors are usually not at the end of the stroke when you approach the problem of changing one.
They will usually, at best, be in the “Start” position, which will be with about a 5-degree stroke position for
the combustion air actuator.
2. Adjust the faulty operator to the beginning (or end) of its stroke by activating the motor’s manual clutch
release and turn it fully CW or CCW. Mark the position of the value or damper before removing faulty
operator.
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