A G-TRAC2 MANUAL
General Manual Revised: 03/15/99
White
Shaft
Connection
Blue shaft that you
adjust if needed
Combustion Set Up
Pot Position Fine Tuning (Low Fire Rate, Low Fire Air)
Adjusting the trim pots may, at times seem to have no effect, but turning the pot just a little more will move the
operator a large step. For some applications this step may be too large. If this happens there is a method to get
the G-TRAC2 to recognize small or partial step movements. This is done by placing the G-TRAC2 into service
mode and attaching a DC meter between the position feedback terminal (PG gas or PA air) and the PL terminal
and record the voltages. Make a very slight adjustment to the required pot. Next, rotate the manual service pot up
or down enough to get the operators to move about 5 to 10 degrees, then rotate the service pot back to its original
position. The operator(s) should now stop in a slightly different position (part step). In most instances the only
indication of a slightly different stopping position will be a slight change of the position feedback voltage (terminal
PG and PA).
NOTE: Making a large trim pot adjustment may slightly affect the setting of the other pots. If a large adjustment is
made recheck the settings of the other combustion related pots.
NOTE: The following set up steps, 1 through 5, have already been done in the factory. They should not need to be
repeated unless damage occurred. A field check to ensure proper combustion would be advised, but only
make adjustments if combustion were not correct. If changing an operator or G-TRAC2, consult
information later in this manual.
Place the probe of the combustion analyzer directly into the heat exchanger outlet, not to the flue. If the probe is
not inserted far enough, flue gas may be diluted by air entering into drain holes in flue, etc.
1. Select the correct burner and gas valve curve (dipswitch on Block B). Setting the dipswitches located next to
the set-point knob makes the selection. If the unit is in the field there should be a label noting the factory
settings. If not, a description of the switch settings is near the beginning of this manual or contact the factory.
2. With the power off, install and adjust the gas valve operator onto the ball valve so that the operator travels the
full 90º stroke (full closed to full open by the clutch). The “PG” terminal is the gas actuator’s positional
feedback connection. With the G-TRAC2 off and the valve in the fully closed position, the resistance of the
gas operator’s feedback pot is less then 50-ohms with the wires disconnected from terminals “PL and PG”.
The pot shaft in the operator is friction fit. To obtain 50
leave in the closed position. Adjust pot with needle-
nose pliers if needed.
3. With the power off, install and adjust the air operator onto the air damper so that with the operator in the
closed position, the combustion air
damper is just slightly cracked (4 to 8
degrees open). With the G-TRAC2 off
and the air operator in the fully closed
position, the resistance of the air
operator’s feedback pot is less then 50-
ohms with the wires disconnected from
terminals “PA and PL”. Adjust the pot
with needle nose pliers (if needed) to
obtain 50
. Leave in the closed
position.
4. High Fire Gas and Air
A. Place the unit into the service
mode (dipswitch A-5 on) and power up the G-TRAC2 terminals “T1 and T2” and the air/gas operators.
(30 paginas)
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