You are taking care of a commercial cooling system and the business owner tells you the problem could be the Carrier AC compressor. This is a big job and can involve major expenses. It’s best to be absolutely sure the compressor is the issue before checking out a replacement. This will save both the technician and business owner a lot of headaches. Here are some helpful tips on checking compressors.
Occam’s Razor
When you have a problem, the simplest solution is usually the best course to pursue. This is the basic reasoning behind the Occam’s Razor philosophy. In other words, be careful you are not so caught up in troubleshooting a Carrier AC compressor, you overlook the obvious.
Is It Too Simple?
You’d be surprised how many businesses call professional help and the only thing wrong is a tripped breaker. Even though you have been told the breakers are fine, you should always check for yourself.
What is the Most Obvious Cause?
The first thing to do is make sure the unit hasn’t simply kicked out on overload. For single phase compressors, take an ohm reading on the windings and check between the run and start terminals for resistance.
It’s Overloaded – Now What?
You have discovered the compressor has an open circuit due to overload. The compressor could be hung up. However, you also could have dirty coils or frozen over evaporator coils. Check out everything which could cause a compressor to overheat.
Carrier AC Compressor Replacement Options
A compressor may appear to be dead but it could be something as simple as the start capacitor. However, let’s assume you have checked all these simple matters and determined a new compressor is needed. It’s now time for the business owner to decide which course of action to take. Here are the options:
- New Carrier AC compressor – this is a very expensive option but it will ensure several years of trouble-free operation.
- Rebuilt unit – a rebuilt compressor is not like a new one and many parts may be worn. In fact, some units are rebuilt by only replacing components which are bad.
- Remanufactured compressor – this is an option the business owner should be aware of. When a reputable remanufacturer goes through a Carrier AC compressor, they completely disassemble the unit, inspect everything and replace important components like bearings, seals, and valves. The unit is restored to “good as new” condition, and leak tests and function tests are performed.
- Used compressor – cheap but very risky proposition
- Replace the condenser unit or the entire system – this is something the business owner may not be able to afford.