EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: vlad777 on December 27, 2018, 05:42:49 pm
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Can someone please explain to me, what are warm in , warm out and cold out temperatures in specification for fridge thermostat.
Specifically Ranco k60p1134 and Ranco k60p1013. I bought the latter one as a replacement.
http://hydrocarbons21.com/assets/link/users_uploads/6496/CT123147_Eliwell_Catalogue_EM_2012_04-12_EN.pdf (http://hydrocarbons21.com/assets/link/users_uploads/6496/CT123147_Eliwell_Catalogue_EM_2012_04-12_EN.pdf)
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The temperature numbers show when the fridge compressor switches on and off. The temperature dial has a range as well (warm, cold) and there is another value for defrost mode, a warming heater is controlled.
Ranco Varifix VP4 K60P1013, 1 door refrigerator, push-button manual defrost, 1.2m capilliary, 1/4" fastons
Dial set to warmest:
Warm cut-out -10ºC
Warm cut-in -4°C
Dial set to coolest:
Cold cut-in -19°C
Cold cut-out -25ºC
Said another way:
Dial range -25ºC to -10ºC (cut-out) with differential of 6ºC.
I can't find data on the K60P1134, it would have different temperature range.
It's too bad manufacturers don't put a R-C snubber across the thermostat contacts to lessen arcing and extend the lifetime. I had to do this on an old fridge that ate thermostats.
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FYI, most mechanical refrigeration thermostats can be "calibrated" by turning an adjustment screw.