OK, DV (millivolt systems) experts...I've got a baffler.
Got a customer with an older Gas Technologies, Inc gas fireplace. This company was the precursor to Heat n Glo...
Not a very aesthetic unit...Flames are all the same size & the logs are concrete...
Anyway, I digress...
Like I said, it's a millivolt system T-couple/T-pile & the unit works fine, burns nice & steady
Mv readings are 550 +/- on the pilot & 220+/- with the burner on...
Perfect, right?
Once the blower comes on, the millivolts on the t-pile drop like a rock...
I mean quickly...
Within 2-3 minutes, the burner will shut right down...
If I turn the blower rheostat off, the mvs climb back to normal...
This unit has a spill switch wired into the valve/t-pile/rocker switch system, so I rewired the the system
to eliminate any potential grounding due to the deteriorated sheathing...
Still the same results...
I took the thermo-disc out of the blower system & still the same results...
I unplugged the fan & turned the rheostat on & the mvs held true...
I turned the rheostat off & plugged the fan into the "hot" (unswitched) receptacle,
& the mvs held true...
I don't have the know-how to test the rheostat or the blower to determine which one is (or BOTH ARE) the culprit...
Any ideas where to check next?
Got a customer with an older Gas Technologies, Inc gas fireplace. This company was the precursor to Heat n Glo...
Not a very aesthetic unit...Flames are all the same size & the logs are concrete...
Anyway, I digress...
Like I said, it's a millivolt system T-couple/T-pile & the unit works fine, burns nice & steady
Mv readings are 550 +/- on the pilot & 220+/- with the burner on...
Perfect, right?
Once the blower comes on, the millivolts on the t-pile drop like a rock...
I mean quickly...
Within 2-3 minutes, the burner will shut right down...
If I turn the blower rheostat off, the mvs climb back to normal...
This unit has a spill switch wired into the valve/t-pile/rocker switch system, so I rewired the the system
to eliminate any potential grounding due to the deteriorated sheathing...
Still the same results...
I took the thermo-disc out of the blower system & still the same results...
I unplugged the fan & turned the rheostat on & the mvs held true...
I turned the rheostat off & plugged the fan into the "hot" (unswitched) receptacle,
& the mvs held true...
I don't have the know-how to test the rheostat or the blower to determine which one is (or BOTH ARE) the culprit...
Any ideas where to check next?