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outdoor reset
Smitdy
Member Posts: 22
I got a question for other contractors regarding outdoor reset controls. My question is -The part that mounts on the outside of the structure, are they Universal/ interchangeable? My assumption is it's simply a resistor and that they are. I ordered one for a customer the other day that the previous contractor had not installed and the supply house gave me one for a different boiler model & manufacturer but said it will work for this one as well... and it did. If this is the case for all of them I will only have to stock one or two on my truck. -Chris, DBA: A-Plumbing&Heating
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Well, a fancy resistor. Technically a thermistor -- that is, a resistor the resistance of which is proportional to the temperature. Any thermistor with the same relationship of temperature to resistance should work.Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England2 -
IIRC there are typically two different types, a 12K (12,000ohm @ 72F) and a 20 K ( 20,000 ohm @ 72F) Just make sure to get the right matching setting.To learn more about this professional, click here to visit their ad in Find A Contractor.1
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Also important to know that many sensors are non-linear so the replacements needs to match the profile in the Boiler manuals0
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@ steam whisperer I messaged the rep from Emerson Swan he told me all of their boilers (HTP) use 10k sensor.0
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They aren't really that prone to failure to stock them in the truck. I think in 20 years I've had one or two give false readings that had to be changed.0
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There's actually a number of common thermistors and a whole passel of uncommon ones. You gotta pay attention to the details. There's at least two common 10K thermistors & one or two more uncommon ones. If you use them right around 25° C (77° F), any one of them will work—that's the 10K part. The further you go from 25° C, however, the further apart the different thermistors will measure, so it's not good to switch the thermistor type for an outdoor sensor.1
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@Eric_32 the issue isn't that they are prone to failure is that another contractor has not installed it. Most recently I had to install one because the garage door installer had removed it not knowing what it is and thrown it away. He said it was in his way... of course he was a moron.0
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