3818 ac compressor overheating-gctid818343

[N4618Q59]

My toward ac stopped working, compressor overheats and stops running leaving fan blowing warm air Need to know tipe of freon gas I can use to ad to the system and any info on this ac Thanks

[RPrather]

How long does the compressor run before it shuts down? If it runs for only a minute or so its more than likely a bad run capacitor. Being low on refrigerant usually won't cause the compressor to over heat. The other problem that might cause it to trip on internal overload is a fouled condenser. Also check the sea strainer if its partially plugged that will cause low water flow.

[RPrather]

The refrigerant type will be listed on the units data plate. If its older than 5 years more than likely it will be charged with R-22 if its a newer unit it will be 410-A or R134-A. I just priced R-22 for a chiller repair and dealer cost on a 30 pound can is $788.00. I would recommend to have a qualified technician check it out to make sure whats going on with it.

[N4618Q59]

Thank you for the help, last year it was working somewhat but this year doesn't work at all it runs for about 3 minutes and shots compressor off I checked it the unit and the compressor gets very hot and causes the thermal switch on top of the compressor to trip off, how do I determine what type of freon it needs fi was to try to recharge it

[N4618Q59]

It is the original Marine Air unit of the front room,

[N4618Q59]

I do have few cans of r22 that I purchased last month from E bay .the unit has two port whit brass caps on it, one is labeled as a suction I suppose that's where gets charged, I am familiar with Automotive units

[RPrather]

It more than likely has R-22. The symptoms you describe its not likely to be low on refrigerant, It sounds like an electrical problem. Low refrigerant can cause compressor over heating but that usually occurs after a long run and after it shuts off with high suction super heat temps. I would start by checking all electrical connections and water flow.

If those are good I would check the compressor start components such as the start and run capacitors and the start relay if so equipped.

[N4618Q59]

I just hooked up the gauge and Freon can to the suction side but I didn't not punched the can it is still sealed and noticed the Gauge in about 3 minutes the needle goes all the way over to the max 360 degrees and the compressor shuts off also noted the water Cooling discharge coils are getting very hot

[RPrather]

If you have a set refrigeration gauges I would hook em up and check the pressures before adding refrigerant. Over charging a system is actually worse than under charging and can cause damage. Also make sure you have a temperature pressure chart and check your condensing water temps and evaporator entering air temps.

[RPrather]

Check the high side pressure also.

[N4618Q59]

I need to get adapters for my gauges lines and start allover again

[RPrather]

Usually if the compressor heats up rapidly its an electrical or condenser/high side issue.

[Sportscar]

Have you made sure you have water flow?? If the coils are getting hot it almost sounds like your not pushing enough water through the system.

[MacPhid]

If your condenser is overheating, check your temperature difference of the cooling water into and out of the condenser. Verify water flow out through the hull. If you have an infra red temperature sensor, check the freon temp inlet and outlet of the condenser and compare the difference. The gas outlet should be quite cool. I'm guessing you have a clogged or scaled up condenser.

From the original nameplate on my Marine Air Systems from 1989, it's R-22 in the unit. The 16,000 BTU aft unit has 16 oz for a charge.

James

[iceclimber]

If the 3818 is like the 32, there is a magnetic water pump near the strainer. If you have one, you can tell if this is the problem right away by putting your hand on it after you hear the compressor shut down. If it's hot, you have found the problem. The replacement is like 2- 3 hundy or you can take it apart and make sure the impellers are clear.

Again, assuming the systems are the same.