Early Thunderbolt Control TC Designation Question

[Westgate Thunderbolt]

I understand that the later Thunderbolt RCM controls were designated RCM1A for three phase power and RCM1B for single phase power. My question is concerning the earlier Thunderbolt controls designated TC-4, TC-7, TC-7C and TC-7D. All of these designations are stamped into the serial number section of the data plate. It isn't a serial numbering system as I have seen the same designations on other control enclosures. Does anyone have any idea what the different TC designations are for?

[holler]

I've got a lot of tbolts also that are TC-7D. I have no clue what it means. It's stamped on every tag on the siren.



picture credit goes to DJ226

[TboltTX1]

My ID tag looks similar except it doesn't have any letter after the "T."

[Brendan W]

My thunderbolt ID Tags are similar... I guess it stands for "Thunderbolt"?

[Westgate Thunderbolt]

The TC designations are specific to the controls only. These individual designations are on the control enclosure wiring schematics for the panel only. I have the schematics for the TC-7, TC-7C and the TC-7D. I don't have them for the TC-4, but I know I've seen that designation on a control enclosure.

[holler]

Some of my tbolts have TC-7D on the blower frame tag and the head tag.