| Electronics > Repair |
| Replacing thermal fuse in a fog machine |
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| paluszak:
This is a picture of MY existing, tested, and fully-functioning thermostat / thermal cutoff switch (See pic). It is apparently a 10Amp, 250V variety with a 208 Degree Celsius temp rating. Here is also a picture of the existing, "tested as DEAD" thermal fuse as well. What thermal fuse do I need to buy to replace this unit? Unfortunately I cannot read the writing on the bad unit as it is 98% rubbed off. Do I need to make sure it's a 10Amp fuse as well, or can it be 15Amp (like the model the local electronics store salesperson pointed me toward)? And what model (or better yet, what Functioning, Holding and/or Maximum Temps) should this new / replacement thermal fuse have? THANK YOU!!! |
| paluszak:
floobydust, I believe that I have finally found the correct TCO I need, however it is listed as 15A (NTE8167), go figure... The Thermostat in my unit again is listed as a 10a/250v? Is it going to be okay to put this 15A TCO inline with a 10A Thermostat / Thermal switch? Do they make a 10A version of something like the NTE8167? Thanks again! |
| floobydust:
Chauvet FX-800 fog machine is 700W or about 6A draw at 120VAC. So both the thermostat and thermal cutoff need to be capable of carrying more than this much current. A 10A or 15A rated thermal fuse would not matter here. These fuses activate first due to pellet temperature. NTE Inc. Thermal Cutoffs TCO datasheets says 10A continuous and 15A interrupting. Digikey also sells TCO's by Cantherm, SDF series rated 10A or 15A at 125V or 250V, depending on the region for safety approvals. If your thermostat is stuck on, then it will overheat and blow the new TCO. I always buy a few extra. |
| paluszak:
Thank you again for your time and awesome help! So I stopped at my local electronic store after work, but they did not have the proper TCO fuse, so I am probably just going to order it online. One quick question though before I do so (hopefully the last) if I may... Why would the TCO temperature be slightly lower (as opposed to slightly higher) than the thermostat / thermal switch temperature rating, as you had stated previously? Just want to make sure I get the correct one, and get this over with. Thank you again for the assistance! Jason |
| floobydust:
The TCO protects the enclosure from getting too hot. The fog machine's designers don't seem to care about only the heater overheating. The TCO is located inside an insulating sleeve, far away on the mounting bracket at the bottom of the enclosure. It does not accurately see the heating block temperature. There is lots of heat loss and really, when the enclosure bottom heats up is when it trips. Some fog machines have plastic enclosures, others a steel bottom, so I think that's why the TCO temp rating varies so much. |
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