A G-TRAC2 MANUAL
General Manual Revised: 03/15/99
2. Heat Required LED ON
Upon a call for heat, the “Heat Required” LED light will come on.
3. Pre-Purge Light
PRE-PURGE LITE ON
When the combustion air actuator is in the correct position, the air-proving switch will close and the “pre-purge”
light and timer will start. When the burner is pre-purging, the “pre-purge” light will remain ‘on’. After the pre-purge
cycle is complete, the combustion air damper has moved to the light-off position, and if required, the gas valve
has also been driven to the light off position:
• The “pre-purge” light turns off,
• The “Burner On” light comes on,
• The set of relay contacts between terminals "AS and 2" close
• The ignition control device is energized.
The flame supervision device energizes the pilot gas valve and spark. If the pilot lights and the flame supervision
device proves the pilot flame, the flame supervision device then energizes the main gas valve.
“DM and DM” contacts will close at this stage to open the dampers, if they are wired through this optional contact.
The “Supply Blower On” light may flash in a long and short pattern, while the heat exchanger is warming up
NOTE: If at any time the combustion air proving switch opens while the burner is firing, the burner is shut
off and the G-TRAC2 will go to flame failure lockout. (Combustion fan will stop in a few minutes). The
“Flame Failure” light will flash and a signal will be on terminal “LK”. The same voltage will be at
terminal C as what is input at terminal A.
If the main flame lit, about 15 seconds later the G-TRAC2 interrupts the pilot valve power. The combustion air
damper and the gas valve position modulate to maintain the required discharge temperature while maintaining the
correct air and fuel ratios for proper combustion. This is Normal Burner Operation.
When the discharge air temperature is satisfied, the combustion air blower continues to run in a “maintain purge”
mode (with the combustion air actuator in a partially open position) to allow immediate re-ignition if there is another
heat call within five minutes. The gas actuator should be at low fire position as that is where the burner cycled off
as part of its normal operation.
At any time during the above, if the heat switch and/or fan switch is turned off the burner is cycled off. The
combustion fan continues to run in a “cool down mode” with the air damper at the “maintain purge” position
(partially open) for 45 seconds.
XIV. TEMPERATURE CONTROL – GENERAL OVERVIEW
The G-TRAC2 is primarily a “discharge air control”. Optional discharge reset devices and night heat packages are
available. Refer to unit wiring diagram and/or G-TRAC-2 dipswitch label to see how your unit is equipped.
Wires to G-TRAC2 OPTION
M,S,U
Remote Set Point
VXYZ
Room RA Reset and/or Night Heat
Resistor Network and +/-
Sensor XZ Ambient Reset – BMS Reset
(30 paginas)
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