So, it’s time to throw your old bro­ken refrig­er­a­tor into the land­fill? Even if it is no longer repairable (for exam­ple, due to a fre­on leak), there are still valu­able work­ing units and spare parts on it that need to be removed! First of all, this con­cerns the com­pres­sor of the refrig­er­a­tor. It will come in handy more than once for pump­ing air, for exam­ple, in wheels or for mak­ing a home-made paint sprayer — an air­brush. To remove the com­pres­sor from the refrig­er­a­tor, you will have to unscrew only 4 nuts and cut off only 2 tubes with a hack­saw — inlet and out­let. The third tube (fre­on) is muf­fled tight­ly. The cop­per tube in the imme­di­ate vicin­i­ty of the unit can sim­ply be eat­en with wire cut­ters, and not sawn off. Of course, before pro­ceed­ing with dis­man­tling, the refrig­er­a­tor must be unplugged!

The next step is to check the removed unit for oper­abil­i­ty. To do this, it must be con­nect­ed to the elec­tri­cal net­work. If the com­pres­sor is run­ning, a hiss­ing sound is clear­ly audi­ble — air is sucked into one tube and thrown out into anoth­er. Remove the assem­bly from the old refrig­er­a­tor as care­ful­ly as pos­si­ble so that the oil in it remains safe and sound. You need to cut the cable going to the tem­per­a­ture sen­sor, then you need to mea­sure the resis­tance and study the loca­tion of the closed con­tacts that will be used dur­ing fur­ther assem­bly, it is very good if the cir­cuit dia­gram of the old refrig­er­a­tor is pre­served.

Preparatory work

Hav­ing deter­mined the out­let pipe from the com­pres­sor, it is bet­ter to mark it imme­di­ate­ly, because an oil fil­ter will need to be attached to it. In order for the used com­pres­sor in the new device not to over­heat and fail pre­ma­ture­ly, it is bet­ter to install a new relay to it, ide­al­ly if the relay is orig­i­nal, cor­re­spond­ing to the brand of the old refrig­er­a­tor. To con­nect the relay cor­rect­ly, you need to study the refrig­er­a­tor dia­gram and make the con­nec­tion in exact­ly the same order that was in the refrig­er­a­tor and which the dia­gram shows. If the doc­u­ments for the refrig­er­a­tor are not pre­served, the cir­cuit dia­gram can be found on the Inter­net.

Also, the new device will have to be equipped with a receiv­er, which can be bought in a store or made inde­pen­dent­ly. You will also need a plas­tic bot­tle for assem­bly, through the holes in the lid of which the inlet and out­let tubes will pass. After insert­ing the tubes, the bot­tle should be filled with epoxy resin, and the bot­tle should stand with the cap down until the resin hard­ens. After the resin hard­ens, the tubes and the cap will be tight­ly mount­ed into the bot­tle.

windshield washer hoses

To con­nect the air pump­ing unit to some kind of device, you will need wind­shield wash­er hoses, which, like a relay, can be bought at any car shop. Dur­ing oper­a­tion of the device, you should care­ful­ly mon­i­tor the oil lev­el, which pre­vents over­heat­ing. It should also be remem­bered that the com­pres­sor from the old refrig­er­a­tor should not work longer than 45 min­utes.

See also - The refrig­er­a­tor freezes food: why is this hap­pen­ing?

How to check the wiring and connect the compressor from an old refrigerator without a relay and a circuit?

Many peo­ple are inter­est­ed in con­nect­ing a com­pres­sor with­out a relay, and there are sig­nif­i­cant nuances here, infor­ma­tion about which is quite dif­fi­cult to find. It is not so much the scheme that is impor­tant here, but the prin­ci­ple. First you need to ring the gen­er­al con­clu­sion, which is locat­ed apart, to the left of the oth­er two. Hav­ing attached the ter­mi­nal to the com­mon ter­mi­nal, you need to find the work­ing wind­ing with the sec­ond ter­mi­nal. For exam­ple, one out­put shows 14 ohms and the oth­er shows 37.9 ohms. Which of these wind­ings is work­ing? Many mis­tak­en­ly claim that the work­ing wind­ing is the one that shows more resis­tance. But this is fun­da­men­tal­ly not true.


The work­ing wind­ing is the one that shows the least resis­tance! And the one that shows more resis­tance is the start­ing (start­ing) one! If you mix them up and con­nect the com­pres­sor incor­rect­ly, it will quick­ly over­heat and will not last long at all. There­fore, in this case, accu­ra­cy is need­ed!

homemade airbrush from refrigerator compressor

This is the rule that works for refrig­er­a­tor com­pres­sors, and this should not be for­got­ten. The next oblig­a­tory prepara­to­ry stage before con­nect­ing is to check if any of the wind­ings breaks into the case. Oth­er­wise, it may hap­pen that you touch the body of a work­ing device, and you will be shocked. And this is not exclud­ed, because the com­pres­sor is not new. To check, you need to touch the wind­ing out­put with the left ter­mi­nal, and with the right ter­mi­nal any­where on the body, test the sec­ond and third out­puts in the same way. Only if the device has shown that all three out­puts are reli­able and do not break through, can such a com­pres­sor be con­nect­ed to a work­ing device.

The next step is to con­nect the com­pres­sor from the old refrig­er­a­tion equip­ment to volt­age using the ter­mi­nal blocks. First — to the com­mon wire and to the work­er. And the start­ing volt­age will be applied by briefly touch­ing the bare wire. But this must be done care­ful­ly and care­ful­ly so as not to get an elec­tric shock. When volt­age is applied, the com­pres­sor starts to hum, and when we touch the start out­put, it turns on and starts blow­ing air. The opti­mal oper­at­ing time is 10–15 min­utes, dur­ing this time some heat­ing of the unit body is allowed, up to 50 degrees, but more can not be allowed.

See also - Is fre­on from the refrig­er­a­tor harm­ful to humans?

If the wiring is in order, you need to change the oil!

Of course, you can leave the old oil, but is it worth it to spend so much effort to con­nect the old com­pres­sor to the new device for only a few ses­sions? Most like­ly, there is long-used oil inside, which con­tains met­al par­ti­cles and does not pro­tect the unit from over­heat­ing well. It is best to com­plete­ly drain the old oil and fill in new engine oil. Where to fill it is not a ques­tion. As a rule, a large bolt is clear­ly vis­i­ble on the com­pres­sor hous­ing, which must be unscrewed with a wrench. Through the open hole, the old oil is drained and the new oil is poured.

How to extend the life of the compressor?

Pre­ven­tion of over­heat­ing and pre­ma­ture fail­ure of the com­pres­sor is a suf­fi­cient amount of oil, prop­er con­nec­tion to elec­tri­cal out­lets and time lim­its. It is not bad to con­nect a capac­i­tor between the com­mon and start­ing out­puts, espe­cial­ly if it was in the refrig­er­a­tor. This sim­ple device increas­es the effi­cien­cy of the engine and extends its ser­vice life.

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