How To Buy a Commercial Used Freezer
This part of the free report covers a commercial used freezer evaluation strategy. How to avoid mistakes in buying a used refrigerator. This free report is an excerpt from the supplemental materials that come with the eBook The System For Saving On Refrigeration Repairs courtesy of
A Step-by-step Strategy
This is a strategy for evaluating a commercial used freezer. The basic strategy is to avoid freezers that have a preexisting problem. Remember that there is no way to judge the internal condition of the compressor, but there are some indicators.
The difference is in the sequence of operations. The freezer has an added defrost cycle. That must be checked out also.
Use the following simple procedure to check out the used freezer operation.
STEP 1 Open the door to warm the box. The condenser fan and compressor should come on, close the door. The condenser fan and the compressor always run together.
STEP 2 The evaporator fan should be running as the box cools down. The evaporator fan always runs.
STEP 3 When the temperature gets low enough to satisfy the temperature control, the compressor cuts off and the condenser fan cuts off. When this happens you can check the defrost system.
STEP 1 Advance the defrost control to activate the defrost cycle. The next time you call a refrigeration technician, have him show you how to do this. You will need to know how to activate a defrost timer and a defrost clock. Timers are more common on small equipment.
STEP 2 The evaporator fan is off. The condenser fan and the compressor is off.
STEP 3 Make sure the defrost heater is working. It is mounted on the back and bottom of the evaporator coils. Do not touch it! It is similar to an electric oven-heating element.
STEP 4 When the ice has cleared from the coil, it warms and the heater is turned off. It can also be turned off after a preset amount of time has elapsed.
STEP 5 When the time has elapsed, the compressor and condenser fan come on. This is vital. The most common failure is that the unit can not come out of defrost itself. Donít get impatient and help it.
STEP 6 When the evaporator has chilled, the evaporator fan comes on. This may take quite a while and the fan may cycle on and off at first. This is normal.
Now the used freezer operates as described in the Normal Operation section until the next defrost cycle.
The rest of the check out procedure is the same as the checks for the used refrigerator.
You may get a great price on a used freezer. After a couple of repairs, the overall price may be too high. At that point you have a lot of money in something that will cost you a lot more money. This strategy can help you avoid that. If you find anything wrong with the unit, move on to another.
The cabinet check, evaporator check, condenser check for a used freezer are the same as for evaluating a used refrigerator.
Start by checking out the cabinet. If it looks good, check out the following thing. If it looks old and worn out, find another unit.
Does the door close securely and tightly? Make sure the lights turn off when the doors are closed. Check the gaskets for splitting, pulling loose drying out. Check for cracks in the walls and doors inside the unit, even repaired ones.
All of these things can lead to excessive running time, evaporator icing and eventual compressor failure. Then you will have to pay for a compressor change and to fix the original problem. Then a used freezer would not be a good deal.
The evaporator is the box with a fan, inside the unit. All the parts should be securely fastened and not bent. Pour some water in the drain pan attached below the evaporator to check drainage.
All the fans should be running. A few units might have a door switch that cuts them off. If so, hold it in to make them run. The fans should not make any metallic noise. The blades should be symmetrical and free of nicks.
Look at the aluminum evaporator fins. You may have to carefully take a panel off the evaporator housing to do this. Unplug the unit first. Check for corrosion and deterioration. The fins are sharp. Be careful.
A bad evaporator can cause compressor failure. An evaporator replacement cost almost as much as a compressor change.
The condenser is the part with the compressor and fan on the outside of the used freezer. On full size units, it is on top or under the units. On smaller units it will be on an end or in the back of the unit.
The compressor is the big black thing with a big and little tube coming out of it. Rarely there may be 2 tubes at the base. With the unit unplugged put your hand on the compressor and try to rock it slightly. If you canít, the shipping bolts were never loosened and the compressor is probably damaged internally.
The problem with checking the condenser coils is that it may have just been cleaned. A unit that has constantly run with a dirty condenser has a damaged compressor. Look at the fan blade and cowl around the fan. If they are dirty, the compressor has had a hard life.
Check to see if the condenser fins are greasy. Grease is a great insulator and caused the compressor to overheat and overwork.
The fan shouldnít make a metallic noise or rattle. It should be symmetrical without any nicks. The compressor should not rattle either.
If everything works properly, you have ruled out many expensive potential problems. There is still no guarantee. There is no practical way to predict future compressor failures. You have greatly reduced your risk, but it cannot be eliminated. Good luck buying a used freezer.
Should you buy used refrigeration equipment?
I recomend that that you do not buy used refrigeration equipment. This is why. I will also tell you how to try to avoid making common mistakes, if you want to do it anyway.
How To Buy a Commercial Used Refrigerator
How to evaluate a commercial used refrigerator before buying it. How to avoid costly mistakes. A simple step-by-step strategy.
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