No need to send the Anthrastat back to AA. It's a simple ON-OFF thermostat with a pointer that gets moved out of position. The pointer looks like a knob-BUT IT'S NOT A KNOB- we all grab it and twist it like a knob because it looks like a knob and that's why it gets out of calibration. We are supposed to use a 1/8" hex key to turn it, but we all forget, thus we have anthrastats that get out of calibration. Nothing could be simpler to fix. (The only other reason they get out of calibration is if they are very old and the bimetal plate work hardens and fails. Might happen once in your life. )
You can all do this. AA will charge you through the nose to calibrate or to replace the unit.
PostBy: mikeandgerry On: Wed Dec 03, 2008 10:18 pm
I found my anthrastat out of calibration recently and I have only turned it with a 1/8" hex key! (well, maybe just once I grabbed it and twisted the bejeevers out of it just to be irreverent!) The black indicator "knob" (gosh, it looks so much like a knob!) is held in place by a small set screw. I noticed that my solenoid was not tripping--ever. Upon inspection, I discovered the knob in question was loose.
With the help of Greg at LsFarm, I calibrated the anthrastat and tightened the knob set screw in the correct postion.
To calibrate the anthrastat, assemble the following:
1. a candy thermometer or other thermometer capable of accurately measuring a water temp of 120-150degF by immersion.
2. a large (tall) pot of water to accomodate most of the anthrastat rod when immersed within.
3. a 1/8" hex key
4. a small screwdriver for the set screw.
5. a continuity tester
1. heat water in the pot to a point between 120 and 140degF
2. shut off heat source.
3. insert rod of anthrastat in the hot water and wait five minutes for the rod to come up to the temp of the water.
4. place continuity tester clips on the two contact screws of the anthrastat
5. insert the hex key in the adjuster screw (the screw you use to change anthrastat settings when in use) and turn screw slowly just to the point where the continuity light changes from off to on or on to off; stop.
6. note the temperature on the thermometer measuring the water temperature
7. loosen set screw on the black indicator "knob"
8. turn pointer on the black indicator "knob" to the same temp shown on thermometer; tighten set screw.
Above all......BE CAREFUL. Dont' burn yourself!