A G-TRAC2
IOM-25 42 of 42 Mar 99 R7
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.
3. Ensure that the switch for direction of rotation and the mounting are the same for the existing and replacement
motors if equipped with rotation switch.
4. Now that the motor is at the beginning of its stroke, when you unbolt the existing one and install the replacement,
tighten up the linkage at this same spot so that the marks are properly aligned.
5. Having done the above, when you restart the unit the stroke of the new motor should be the same as the old one,
thus the combustion set up should be the same and not need adjustment if it was burning correctly before.
6. If time permits, check for combustion values noted in Section XXII to ensure proper combustion.
XXV. MISCELLANEOUS NOTES
If the flame relay has sensing problems at low fire, the low fire rate is probably set too low.
If the flue gets black check the high and low fire O
2
. If these are okay check the selected air fuel ratio curve selection.
Check the O
2
through the combustion range. It is still possible to have a bad set up.
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