A G-TRAC2 MANUAL
General Manual Revised: 03/15/99
Burner Pulsing, Backfiring, Exploding, Noisy
An improper air/fuel mixture usually causes this condition. Do not attempt to do any combustion analysis until the
inlet fuel pressure has been checked with the unit operating at high fire. (This should include other loads on the same
gas system being on.) If the inlet pressure falls too low then the velocity of the air over the flame will be too great
and tear the flame. If the burner is designed and set up for proper fuel pressure and it does not have it, it will react
exactly like a burner with too much combustion air. If the inlet fuel pressure is correct at high fire then the
combustion set up should be checked.
If an explosion occurs after the fire has been off and is in the process of being re-lit, it is likely due to a leaking gas
valve. It is recommended that both the main and pilot valve be replaced if you cannot prove the source of a leak.
Fire without Combustion Fan
If there is a flame operating in the burner section without the combustion fan in operation, check to see if there is
power across the G-TRAC2 terminal 3 and neutral. Record the result. Next check to see if there is power on G-
TRAC2 terminals 2 and neutral. Record the result. Next, check to see if there is power to G-TRAC2 terminals T1
and T2. Record the result.
If there is no power to any of the above terminals and if all wiring is as per the original diagram, there should not
be any power to the pilot or main gas blocking valve. Very gently turn off the manual valve for the pilot gas. Check
to see if the flame has gone out. If it has then the pilot solenoid is likely leaking. If the flame is still on gently turn
off the main firing valve. If this stops the flame then the main valve has been leaking. At this time turn off the line
valve to the unit and repair the problem.
Heat Locked On – G-TRAC2 Slave to C-TRAC
• Change G-TRAC to model 2.2
• Set C-TRAC cooling deadband pot 3 to 4 degrees higher than normal.
• Set C-TRAC heat envelope pot to position 1.5.
• Heat may stay on due to G-TRAC2 integral timing if the G-TRAC2 heat switch is left on when the C-TRAC
switches to mechanical cooling. Stage 1 mechanical cooling call should turn power off to G-TRAC2 terminal
“HS” by opening relay contacts.
Prepurge Light Stays At “Damper Moving” Status
If the pre-purge light indicates that it is in the “Damper Moving” status for an extended period of time, and the
damper motors appear to have reached the end of their stroke, the problem is often the resistance value from the
feedback pot in the damper operator. Pushing the actuator linkage often moves it enough to correct the problem.
Refer to Section XXII for a diagram and description of this pot and its settings. Just tweaking this pot a few ohms
will resolve the problem if it is repetitive.
Replacing a G-TRAC2 in the Field
If the G-TRAC2 air operator, combustion air damper, main burner modulating valve or its operator is changed, the
combustion should be re-checked for correct set up. After the change is complete, operator travel and combustion
should be checked for proof of repetitive operation at least three times before acceptance. To just check it once is
not acceptable.
NOTE: If the following information is not recorded on the G-TRAC2 configuration label attached to the control
cabinet wall, any time you see any G-TRAC2 equipped unit, you should record these voltages on the wall of
the control cabinet for later use in case the G-TRAC2 ever fails.
(30 paginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentarios a estos manuales