cooler thermostat help

Karl Townsend · 2007-09-08T21:40:09+00:00

Each of the evaporators in the apple cooler has a thermostat like item C on page 603 of They are mounted on the 13' ceiling in the dark area behind the evaporator. I have to climb to the top of a 10 foot step ladder to adjust them and they need several adjustments per season. My old tired eyes almost can't see the dial anymore, trying to look through bifocals to the ceiling while holding a flashlight and leaning over a stack of apple boxes just ain't fun.So, I'm looking for a better thermostat. First I looked at an electronic thermostat - item E on the same Mcmaster page 603. I could move it about four foot down the wall as it has a longer bulb length. That would put it 9-10' high on the wall. easier to see but still need a ladder.Then I noticed item 331K21 on page 544. If I could lengthen the cables from 3' to 30', the control unit could be placed near the cooler walk door at eye level - no more ladder. It says the sensor is a thermistor probe with a 3.5' cable. So, can a thermistor probe cable be lengthened?Or, any other good suggestions? I'd really like to adjust cooler set point without a ladder and at the front of the room if at all possible. The back evaporator often gets stacked in. FWIW, any thermostat just energizes a 220 VAC solenoid to let the refrigerant flow.Karl

Sep 08, 2007 22 Replies

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Dave Martindale 19 years ago

I once built a bunch of thermocouple junctions for a science experiment. All that was needed was stripping a bit of insulation from the end of the TC cable, twisting or otherwise putting the two wires in contact at their ends, and a moment in an oxyacetylene torch flame.

Dave

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