serial # 14L05317
This is Tech TOWN. For identifying your THERMOCOUPLE (no "R" at the end), you should contact PartTOWN:
This is interesting since they don't show that model number on the southbend site or Partstown I found this:
But they do show the spec sheet for a 73 inch 4721DDin the 400 ultimate line of ranges. Dated 2014. DD means both ovens are conventional. AA would be convection But the provided operators manual says that it uses a THERMOPILE. They are a lot longer lasting and rarely fail unless the pilot flame is off. So I Wonder if our guest has even troubleshooted it.
From the manual:
I guess Middleby is a bit behind on paperwork.
Ovens that use a THERMOPILE, though? I've only seen that in deck ovens. Might be the wrong manual for that serial number.
Here's all I could find on their website for that model number. A spec sheet for a 72" range:
Yea, that's the same spec sheet I found. The ultimate series heavy duty ranges are the 400 series. Found a operator manual for the unit on the Southbend site under Heavy duty ranges, Ultimate (400)
I was confused for a bit there. PartsTOWN's earlier version of that manual alludes to a THERMOCOUPLE in the troubleshooting guide. However, what you posted indicates a THERMOPILE. Here are two side-by-side:
The publication that you found at the Southbend's website is the 2014 revision....and is CORRECT. There's no parts breakdown in it, but the schematic on page 28 confirms that the oven uses a thermopile along with a combination valve (a basic millivolt system).
Ultimate Restaurant Ranges, Owners Manual 1190820, rev 4 (10/2014)
The 2010 revision (from PartTOWN's library) has a parts breakdown which the 2014 manual lacks. BOTH manuals have the same schematics. The parts breakdown also reflects use of a thermopile w/combination valve:
Ultimate Restaurant Ranges, Owners Manual 1190820, rev 3 (11/2010)
SO...the earlier (2010) manual contradicted itself.
I guess I didn't work on many (if ANY) of these. I do agree that the millivolt setup is superior to the use of a thermocouple with a TS11 or BASO pilot safety valve. However, repairs would be more expensive.
It's like the sale to middleby has confused the South bend management on who does manual maintenance. And forwarding to Partstown info.
Southbend has always been on the lead with oven control systems. I remember calibrating a convection oven from the late sixties and there hydraulic proportional gas control would hold the oven within 2 degrees. Wild!!
The millivolt thermocouples are small and easy to overheat with a over adjusted pilot. The bigger and more robust thermopile tends to tolerate a wider variation of flame. I think it acts like a bigger heat sink. But I do know that most thermocouples are replaced prematurely from incorrect or lack of diagnosis. Often it is the lack of a tap to test or the knowledge. And because it is the cheapest item in the control system, let's try this. And non OEM couples are common in big box, hardware, plumbing, and even farm stores. Of course, the fit and reliability does not match OEM. I have found them wired in place, hanging by the tube and just resting on the burner.
A lack of knowledge is a dangerous thing.
I forgot to mention, His serial number does look to be December of 2014. Problem is that the Ultimate's are a customization range It can come with 40,000 BTU burners instead of 33,000. let alone the different top versions But still, after 4 years they should have more out there. After all, Kitchens are known for not reading manuals and losing them.
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