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Refrigerators on Shabbos: Difference between revisions
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If the door to the refrigerator is opened letting in warm air, it can cause the thermostat to contract, completing the electrical circuit and turning on the compressor again. | If the door to the refrigerator is opened letting in warm air, it can cause the thermostat to contract, completing the electrical circuit and turning on the compressor again. | ||
In refrigerators with a compressor only, there were three opinions in the poskim if it was allowed to be opened on Shabbos: | |||
1. The refrigerator not allowed to be opened on Shabbos at all (Chazon Ish. See Chut HaShani-1 pg.199). | 1. The refrigerator is not allowed to be opened on Shabbos at all (Chazon Ish. See Chut HaShani-1 pg.199). | ||
2. The refrigerator was allowed to be opened only while the compressor was running so that letting the warm air in would not directly activate it (Igros Moshe O’CH 2:68). | 2. The refrigerator was allowed to be opened only while the compressor was running so that letting the warm air in would not directly activate it (Igros Moshe O’CH 2:68). | ||
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So each time the door is opened the microprocessor makes many changes to the calculations so that it can adjust the systems accordingly: How often to turn on the compressor, when to open the damper vent, how wide to open it, when to turn on the defrost etc. Every change in calculation creates a new electronic switch in the circuitry. | So each time the door is opened the microprocessor makes many changes to the calculations so that it can adjust the systems accordingly: How often to turn on the compressor, when to open the damper vent, how wide to open it, when to turn on the defrost etc. Every change in calculation creates a new electronic switch in the circuitry. | ||
In Eretz Yisrael most poskim today forbid using a refrigerator on Shabbat without some type of Shabbos mode switch. | In Eretz Yisrael most poskim today forbid using a refrigerator on Shabbat without some type of Shabbos mode switch. More recently refrigerators are being made with approval from Kashrut orginizations that ensure these systems are not tampered with on Shabbos. | ||
