This Part is a Surface Mount Style HI LIMIT: Single Pole Single Throw THERMAL FUSE Auto Reset (With NO CAPILLARY)
This Hi Limit Surface mount surface mounts to the heater in a spot where it can read what the actual water temperature is flowing through the heater. When the hi limit thermodisc reaches 121°F it flips inside out opening the circuit usually shutting down the entire system.. There are some brands of controls however that still operate the pumps and such except the heater does not operate until it resets the Bi-Metaliic wavy Disc inside that trips inside out when it reaches 121 degrees Fahrenheit. This is not always the best system since the friction from the water movement and the heat from the pump motors can continue raising the temperature of the water to even more unsafe levels..If the system did stop then as the water cools the metal will cool and will retake the previous shape and close circuit again and attempt to run the heater again.. Until the temp reaches 121° again and it will continue this cycle until the situation is solved. Some Hi Limits require a manual reset this one does not..
The way you can decide if this auto-reset Hi Limit is bad or not is first it is a normally closed circuit..Therefore if the circuit is not closed it is bad. It is also bad if it will either be open and will not close the circuit under any temperature setting hot or Cold. Or if it is opening before it reaches 121° F.. or after opening at 121° F it will not reset when the temp falls below 121°f on the thermodisc surface it is attached to.. In any of these scenarios it is defective and must be replaced..
It can be found and used as a replacement for Sundance Sentry 850 Heaters under the numbers HI LIMIT: DISC OEM Code 314100 6000-093 Replaced: SD6000-093 Sundance 6000-093 as well as other applications Like Cal Spa Heat Exchangers with a Wet Element and other parts number it can replace are are follow: Allied Code 2-05-0110, OEM Code 314100 6000-093, HI LIMIT: SPST THERMAL FUSE (NO CAPILLARY)
Replacement For: AI #SD6000-093 / MFG #6000-093 Brand name : Thermodisc
Surface Mount, auto reset Sensor used on Sundance smart heaters and Cal Spa wet elements among others.
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