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I worked on an old delfield freezer hat had r12 in it and the condensor fan and compressor would turn on when I plugged it in but the evaporator fan motor would not come on. I ran 120 vac to it and it ran, but the unit did not have a sqamatic and I really didn't know the real sequence of opperation to figure out why the fan would not come on for the evaporator. If you could find some thing on the model:6125-s or might be 5 with serial# 147697-T let me in

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  • Refrigerators Master
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Some older models ran power throughthe door/ light switches, for the evaporator fan, or perhaps even ewired through the defrost thermostat( reason for that is if evap is warm no need to run a fan and circulate hot air through the cabinet did you try letting run for a while mighttake 20-30 min to get cold enough to trip the defrost thermo.I usuallly hit it with a shot of the freon just ot freeze it shut real quick

Posted on Apr 02, 2008

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Posted on Jan 02, 2017

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1 Answer

Causes freezer compressor freeze up


with such limited information, I can only answer generic. Most of the time it is because the evaporator fan(s) are not running or the evaporator is frozen over. With further info such as model, serial, or more details on behaviors, I could probably helps some further.

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The unit needs two fans running and good airflow, one fan outside cools the condensor coil and the other inside the unit blowing across the evaporator coil, warming it. The compressor must start up. The defrost timer stops everything and switches on a heating element to defrost the evaporator for several minutes. Please verify these conditions. The condensor coil may get clogged with dirt and lint, the evaporator may get clogged with ice build up, or the fan may quit working due to bad bearings, need for lubrication, or burn out. The defrost timer has an internal motor and contacts which may quit working, some have a way to manualy turn it to switch its mode in case it quits working.

on Feb 11, 2015 | Freezers

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Ac problem at idle after converting over to 134a from r12


to convert from r12 to r 134 a the entire system has to be changed
that is condensor, compressor, evaporator, hoses ,the lot because r134a runs at much higher pressures than r12 ( nearly 3 times higher in psi)
it needs different gauges and has different fill connections so that the gasses cannot be mixed
to make it worse the oil used in the compressor is different because of the different gas and is not compatible with the r12
there was nothing wrong with r12 gas but companies and customers were "hoodwinked" into believing that the r12 was bad for the atmosphere and r134a was the answer
just as you have been " hoodwinked" by the person into getting a gas change over without being fully informed of what was involved and why
with r134a gas there has to be a fan in front of the condenser that works immediately the ac is switched on as the temp of the gas being converted back to liquid is much higher because of the higher pressure need to convert it back from gas to liquid
without that fan the system starts to circulate gas and so the evaporation of the liquid at the evaporator in the car is lost and no heat from the car is transferred back outside
what it means is this --- if you can get r12 gas , change the compressor back to an r12 compressor, have the system completely flushed, vacuumed down for at least 1/2 hour and then refill with r12
If on the other hand you have to use r134a because that is the only compatible compressor available then the evaporator , hoses and condenser have to be changed as well and that means a new ac kit basically
find yourself an accredited ac specialist shops and get quotes

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yes it can. if the model is a techumseh find the local dealer.
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equivelant. no oil change . replace the filter drier when you replace it .the refrigerant charge will be about 90% of the original r-12 charge

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1 Answer

Compressor runs bypassed thermostat with wire that turns on and off compressor,but freezer cabinet is not cold 65 degrees evaporator fan does not turn on,condensor fan on,sttill no cold


If you have just turned it on it takes awhile for the fans to come on. The evaporator coil has to get cold about (10 to 20 degrees) and make a klixion fan switch to turn the fans ON.... Is the evaporator coils getting a frost pattern on them??? If not then the system may be low of Freon.. If the coil is completely froze up and you are getting frost back to the compressor..... then you have a bad fan switch or a door switch.... If you have a wiring diagram you can trace out the wiring.... It is usually down by the compressor or control panel... hope this helps.

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1 Answer

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The fans are controlled with a clixon that has a cut in at 5 degrees, and cut out at 20 degrees. If the unit is running and the fans are not comng on then I would have to say you are out of freon. But your condensor fan could be running and the compressor NOT be running which could be a problem with your compressor. Find out if your compressor is running by taking an amp draw. If compressor IS running then you are low on freon. If the compressor is running and your evaporator coil is cold and your fans AREN'T coming on then your clixon is bad.

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You may have a small leak in the evaporator. You could try to get a replacement freon with stop leak from the automotive store and give it a shot. If it is a R12 unit then it is too old to repair. But it is worth the gamble to shoot it with freeze 12 or an equivilent before you condemn it.

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Is the frost on the entire surface of the evaporator or just a portion. If it is only frosting on a portion there is a possibility your system has developed a leak and has lost some of the charge. Or your compressor has lost its ability to pump the gas. A bad condenser fan motor overtaxes the compressor and can cause premature failure. If it is a bad compressor it may be time to replace the refrigerator. Replacing the compressor is an expensive job and the warranty is only one year on a replaced compressor.

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