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Chestcold F 40 3 way fridge . 12 volt thermostat .
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<blockquote data-quote="Katabatic" data-source="post: 586876" data-attributes="member: 19153"><p>Here's a circuit using a 30A relay and a thermostat:</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/19153/1607856646_fridge_thermostat.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>A word of caution about your idea to "...hang the bulb into the fridge..."</p><p></p><p>Some fridge thermostats are air-sensing, and some are evaporator-sensing.....depending on which type you end up with will determine whether you can just hang the bulb in the fridge, or need to attach it firmly to the evaporator assembly.</p><p></p><p>After your relay has done a bit of work switching 10A DC, the contacts will end up looking like this:</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/19153/1607857235_burnt_contacts.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>How long this takes will depend on the number of switching operations, which in turn is dependent on set temperature, ambient temperature, and internal heat load, and hours of use.</p><p></p><p>When the contacts start looking like the above, you will start losing voltage to the fridge and subsequently cooling capability.</p><p></p><p>It will pay to keep an eye on the voltage across the fridge coil from time to time.</p></blockquote><p></p>
[QUOTE="Katabatic, post: 586876, member: 19153"] Here's a circuit using a 30A relay and a thermostat: [img]https://www.prospectingaustralia.com/forum/img/member-images/19153/1607856646_fridge_thermostat.jpg[/img] A word of caution about your idea to "...hang the bulb into the fridge..." Some fridge thermostats are air-sensing, and some are evaporator-sensing.....depending on which type you end up with will determine whether you can just hang the bulb in the fridge, or need to attach it firmly to the evaporator assembly. After your relay has done a bit of work switching 10A DC, the contacts will end up looking like this: [img]https://www.prospectingaustralia.com/forum/img/member-images/19153/1607857235_burnt_contacts.jpg[/img] How long this takes will depend on the number of switching operations, which in turn is dependent on set temperature, ambient temperature, and internal heat load, and hours of use. When the contacts start looking like the above, you will start losing voltage to the fridge and subsequently cooling capability. It will pay to keep an eye on the voltage across the fridge coil from time to time. [/QUOTE]
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Chestcold F 40 3 way fridge . 12 volt thermostat .
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