Question about Dometic 57915531 Air Conditioner

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Can the duothermo model # 57915.513 be recharged.

A copper pipe fitting broke causing the unit to lose all refrigerant. I have soldered a new fitting in but do not know if it possible to recharge the system. I have heard it is possible to solder a saddle valve into the system. Is this true? If so, where does one find the valve? What refrigerant do I need? Is that refrigerant available to the retail public?
Thanks much, Dan

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You will need R-22 refrigerant. Yes you can install a sattle tap valve. The problem is that you mean the public cannot buy saddle taps or freon do to enviromenalist

Posted on Feb 11, 2009

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I am having problems with the connections of my hot water heater. The connection of the cold water to the water tank leaks around the connection. When I tighten it the pipe twisted and it started...

Remember, that COLD water might cause condensation as it nears the Hot Water tank--

However, you seem pretty sure it was leaking-- so-- What type of piping are we working with: Copper, Plastic, or what?

Copper is the best-- but requires soldering fittings-- are you equipped to do that?

Plastic has shrink and expand problems around a Hot Water tank, and might be why you have the leak?

Tell us more, -- how far do you want to get into this?

Mack B

Jan 19, 2011 | Heating & Cooling

1 Answer

Old copper with paint, cleaned end, fluxed it, tried to tin it and solder will not stick. Tried three times. I was using my plumbers torch so I don't think heat was a problem. I have only run across this...

Are you trying to solder on a closed piping system? If so one thing that will cause many problems is any moisture in line. It does not take but a drop or so to vaporize to steam and cause oxidation on pipe or fitting which will cause solder not to stick.If you are working on closed piping try to find valve or faucet somewhere to vent steam. I would clean again and make sure you are using good flux and right solder & try again. Hope this helps. Thanks

Nov 09, 2010 | Heating & Cooling

2 Answers

Hello, My condensing unit (LG-LMU245HV) and my wall unit (LG-LMN185HV) are brand new and were installed just one month ago. Everything has been running fine but now all of a sudden now the air coming...

Hi, when the copper lines at the condensing unit, the larger of the 2- start to form ice, you have a freon leak. The unit is new, so I would expect the leak to be at one of the welded/brazed joints. What will happen, is the indoor unit, the evaporator coil will start to ice over and block off all air flow through through the coil. I hate to tell you this, you will need to call the installer out to do a leak check on the unit. They will then need to pump it down, braze the leak with sil-phos, or silver solder and recharge the unit. This is the problem, I see this a lot on new units. Someone forgot to do a leak check on it. Being only a month old, it has to have a warranty on it, shouldn't cost you a dime, but this is the problem, indeed!! Please keep me updated on this and get them out there. It will never cool until they fix the leak and recharge it. Please don't forget to rate me on this, I know you will be kind. Keep me posted and you can contact me by my user name below. Thank you Zeke! You still have freon in the unit, just low enough to start the suction line outside to start to ice and loose your cooling.
A/C, Heating, & Refrigeration Contractor

Aug 06, 2010 | Heating & Cooling

2 Answers

Hello! The copper line is broken where it attaches to the cooling unit. Is it possible that the line can weld? Thanks

It can probably be soldered ... then recharged. Seek help from your professional RV repair shop.

Jul 13, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Condensate copper discharge line has disconnected internally.

If the line has come out off the 3/4" copper adapter, it will have to be re soldered, or you can buy the same fittings in pvc plastic very cheap and do it over, very easy to due. Just get the fittings and pipe at Home Depot or a hardware store and re do it. Most condensate lines are pvc anyway.
Keep me posted on this if you need help.

Jun 11, 2010 | Heating & Cooling

1 Answer

A pipe has broken away from the main fin unit on my B1900 unit. I am advised that it cannot be fixed and will have to fit a new unit. Is there a fix solution?

If the pipe you are saying is broke is on the condensor coil and is copper it probibly cannot be repaired without costing a lot. My suggestion would be to purchase the coil by itself (this can be done at any r/v dealer) and have the old coil removed and the new coil welded in its place. The r/v companies won't tell you that this is an option due to the amount of monies they make selling you a complete unit. By getting a new coil you can find a a/c tech that should be able to install and recharge the unit for quite a bit less than having to purchase an entire unit. The only problem I see here is the actual size of the roof top unit however, a good a/c tech should be able to do this for you fairly inexpensive and have you up and running in no time. Good Luck on your repairs I hope I have helped you in some way


Oct 21, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

How to recharge refrigerant, can a car refrigerant canister be used?

There is an information tag probably on the back of the unit that tells you model number, serial number, manufacturer, etc. On the same tag it will tell you the refrigerant and the amount of refrigerant in the unit. If it is R-134a ( which is probably is) then yes it is the same refrigerant used in vehicles. However, legally you must repair the leak before you recharge the unit. You can buy the cans and adapters at an auto parts store.

May 02, 2009 | Heating & Cooling

3 Answers

Goodman Model CK60-1C with White Rogers mercury tube thermostat

The contactor on the outside unit is sticking and must be replaced. The inside unit cycles off and the outside continues to run causing the refrigerant lines to freeze up.

Jul 29, 2008 | Goodman CKL60AR60 Air Conditioner

1 Answer

Window air conditioner

You could get the valves from a scrapyard either out of a car or old refrigerator to solder in and refrigerant gas recharge cylinders from eBay.

Alternatively you could solder in a thin copper tube to refill the AirCon then crimp it before cutting and soldering it to make a perfect seal. This is how the manufacturers do it.

Jul 09, 2008 | Heating & Cooling

3 Answers

Leak on home A/C

You need to have the system evacuated to fix this leak. First thing is for safty reasons, for your protection and refrigerant release. second is to make sure no contaminates are released inside your system. The tech should recover the refrigerant fix the leak, then purge with nitrogen, then pull a deep vaccum to 500 microns and it should hold for 20 mins. then he should recharge the system with refrigerant.

Hope this helps

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