My chest freezer just died. The thermostat dial seems to move a relay
up/down and if I push the small stem that sticks out the end (Ranco type
K50) the compressor cycles on. I guess I need a new thermostat. The
dial won't move the level the extra 1-2 mm needed to activate the
How does the sensing coil actually work? On air pressure? If I were to
cut it open, I think it's hollow inside, similar to a furnace
thermocouple. I presume the sensor somehow moves one end of the relay
but I'd like to understand how the thing works since I'm curious.
If it's a coil, such as in the older style (round) Honeywell thermostats...
the coils is made of bi-metallic strip. One metal expands more, than the
other, which causes bending. Most simple overtemp devices have some
The bi-metal may be a conducting member itself, or push on something, or
tilt a mercury switch (home thermostat)
I referred to it as a coil, but only because when you buy one the
(hollow?) tube is coiled up. Okay, rolled up.
You have to unroll it and insert it up a metal tube at the back of the
freezer near the bottom.
It looks like this:
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