A G-TRAC2 MANUAL
General Manual Revised: 03/15/99
Dip switch Block “B” – Fuel Curves/Air Curves
The G-TRAC-2 has built in air to fuel ratio curves. The combination of these curves provides 16 possible settings.
The curves are selected by turning dipswitches on or off. These dipswitches are located in a slot below the set-
point knob on the front of the control. Dipswitches 1 and 4, on block A and B, adjust the gas valve curve;
dipswitches two and five adjust the combustion air curve. There is a label attached to the unit indicating the
factory dipswitch settings.
The correct curves for a particular burner will vary based on the gas valve, air shutter, and combustion air blower
and unit size. If there are problems with condensate forming in the flue, the burner can be set up to reduce the
amount of condensate formed. This will required the burner to operate with extra combustion air (higher O
2
) in the
mid-to-low fire range. Increasing the amount of combustion air distributes the water vapor, formed during
combustion, over a larger volume of flue gases. This dilutes the concentration and lowers the dew point
temperature. Note however, that increasing the amount of excess air too much will reduce the burner efficiency,
slightly.
Following are curve guides for setting up air/fuel mixtures.
• Dipswitches 1 and 4 set gas valve curves.
• Dipswitches 2 and 5 set air damper curves.
GAS CURVES
Gas
Curve
Dip switch 1 Dip switch 4 Characteristics
1
OFF OFF
Undersized valve or high efficiency application. Lower O
2
in mid-range.
2
OFF ON Normal Setting
3
ON OFF
Oversized gas valve or condensate reduction. More O
2
in
mid-range.
4
ON ON Even more O
2
in low and mid-range. *
* On versions manufactured after May 12, 1998.
AIR CURVES
Air Curve Dipswitch 2 Dipswitch 5 Characteristics
1
OFF OFF
Rich (Lower O
2
in mid-range).
2
ON OFF Normal Setting
3
OFF ON
Lean (More O
2
in mid-range).
4
ON ON Lean “S” curve
Dipswitch Block “C” – Low Limit, PI, CTRAC, 0 10 VDC Control
This dip switch block is located
G-TRAC 2.1 - near the top on the back of the board.
G-TRAC 2.2 – through the small slot at the very top of the panel front.
The controller must be turned over to access these switches.
This dipswitch block provides low limit enable or disable, and control choices of “Normal PI”, “CTRAC PI” or
“Direct 0
10 VDC Control” (such as from a BMS).
NOTE: XXX Switch position does not affect description in “ACTION” box.
(30 paginas)
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