Gas fireplace with powerpile, and thermocouple

zepfan

I was replacing a pilot assembly on an LP gas fireplace, that has both a powerpile, and a thermocouple that attach to the gas valve. I was wondering what is the purpose of the thermocouple, if the pilot assembly already has a powerpile? I am used to see one, or the other but not both There is no external power supply for the fireplace, the pilot assembly does it all. Any suggestions or insight would be much appreciated. thanks to all.

EBEBRATT-Ed

Is 1 monitoring the pilot and the other the main flame? Do they have another control besides the gas valve

zepfan

Thats what I was thinking, but both connect to the same gas valve. Only one valve in the fireplace

mattmia2

Simpler gas valve design, same valve for millivolt and 24vac, just change the solenoid and connect a transformer or thermopile depending on model.

Bob Harper

The TC is for flame proving to keep the pilot lit. Since there is a thermopile, the TC is typically a 30 second "quick dropout" used in gas direct vents with a glass front. The thermopile powers the main operator function.
Provide make and model please.

zepfan

The gas valve is a Robertshaw. The fireplace is a heatglo model# 6000TRLP-oak serial# 00289519, and yes it has a glassfront

Tim McElwain

What is the model number of the Robertshaw valve?

zepfan

the model# is 7000mvrb-4-lc-lp thanks to all

Tim McElwain

Suggested Replacement

https://mccombssupply.com/robertshaw-millivolt-gas-valve-7000mvrlc-710-508-fireplace-log-control/?gclid=EAIaIQobChMIjrj0pNS09QIVNfTjBx2HQgGyEAQYAyABEgI0R_D_BwE