External T-Stat for Monitor K-1 heater?

[HayZee518]

with NO thermistor connected [open circuit] the unit defaults to 42 degrees no matter what the set point is. I never tried to short it out so I don't know what it'll do. you do have a point tho. use a linear pot in series with a thermostat so you can vary the resistance to a "temperature"

[adnadeau]

I meant short out the 5K pot, not the thermistor.

[bucyluca]

Originally Posted by adnadeau

Do you want complete thermostatic control or just the option of switching between two temperatures remotely? The thermistor is a 10K @ 77°F device. At 70° it has a resistance of approx. 11940 ohms and at 58° it has a resistance of approx. 16400 ohms (from USSensor's web site), difference of 4460 ohms. If you stuck a 5K ten-turn pot in series with the thermistor and switched it with a remote double-throw universal thermostat telephone control, you could switch in for the lower setting, and short it out for normal operation. Adjust the pot for whatever works best. Get a pair of matching Molex connectors to add it into your unit.

Thanks, thats what I wanted to know. All I want is to set it either from 58f or 76f. My neighbor is an electr. engineer, and I'll show your post. Hopefully he can come up with the solution.
I alrady have the freeze Alarm box that connects to the phone line, with 2 thermostat in ports built in.

I'll post a followup.

In the meantime, if anyone knows of an existing kit, let me know.

Thanks again for the details.

Happy New Year