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grjr
 
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pressure switch:
check voltage across 1&2, when contacts are closed you should see 0V if contacts are open you should see some voltage
check voltage across 3&4, when contacts are closed you should see 0V if contacts are open you should see some voltage

thermo-switch I am guessing should depend on whatever temperature it is suppose to switch at, you'd need a thermometer and know how and when it is suppose to switch.
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Old 08-11-2010, 05:07 PM grjr is offline  
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kstokes
 
the resistance of the coil of a relay isn't terribly important, as long as it's "ballpark correct". 80 ohms vs 120 ohms, I wouldn't worry. Tolerances are all over the place on the coil.

As long as the switching contacts have virtually no resistance when they're switched on, and infinite resistance when they're switched off, you've got nothing to worry about.
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Old 08-12-2010, 10:32 PM kstokes is offline  
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