13 seer a/c a-coil

[qaztwo]

Replacing my 1970 ac with a york 13 seer 2 ton ac. Can I save money by using a 2.5 ton a-coil or should I find a 13 seer 2 ton coil.

 

[ob]

Re: 13 seer a/c a-coil

A bigger evaporator coil set will do little if the rated tonage of the condensing unit is 2 ton.Actually a person would be better off power use wise to increase the volume of the outdoor coil as it would equate to lower head pressure and cooler condensed refrigerant on the liquid line to evap coil.Best thing I would suggest is to size both the condenser and evap coil to the same brand and tonage specs and insure that the overall unit is sized in accordance with the conditioned space.

 

[SS MAYFLOAT]

Re: 13 seer a/c a-coil

The "A" coils that I have installed in the past usually comes with sizing orifices. Each one for a particualr output of the condenser. I suggest replacing your whole evap/cond unit with new. Your old one could be contaminated with acid that could prematurely kill your new condenser unit. Also after 30+ years of dirt inside the fins of your old coil will cause problems in proper adjustment of your superheat. This important for maximum output of your system.

I got to differ with OB. The new units that have Copeland Schroll compressors operate at higher head/suction pressures. These units also use the newer R410A which is designed for the higher pressures. I too was like OB thinking the same way. I just finished a compressor school that sorta made me change my way of thinking.

Incorrect sizing of the units will cause short cycling, improper superheat, and mostly higher operating costs. This too also will cause frequent visits by your service agent. He will be happy and you won't.

The USA will be caught in a stuggle with the elimanation of R22. Europe will be done using R22 in 2010 while the US is 2020 for now. I think that date will be moved up do to the increase of concern of global warming. When this transition happens, expect all service of the old systems to dramatically increase as the deadline comes close.

So it is a matter of pay more for the new 95% effecient units and low maintenance later, or pay less for a old style unit with super high maintenance costs later.

Example of the increase when R12 was done away with.

1980 R12 for a 30lb container was about $25 to $30
1984 R12 for a 30lb container was about $100
1988 R12 for a 30lb container was about $200
1991 R12 for a 30lb container was about $750 and prior to the deadline,,,,,$900!

I expect that when R22 is phased out, it will be the same way. Most of us will be forced into buying all brand new units when this happens.

 

[Coors]

Re: 13 seer a/c a-coil

Maybe not; the new r134a in cars will work in old r12 cars, maybe it will be similiar with houses.

 

[SS MAYFLOAT]

Re: 13 seer a/c a-coil

Maybe not; the new r134a in cars will work in old r12 cars, maybe it will be similiar with houses.

You will only find 134a in smaller applicances and autos. Larger units that require numerous pounds of refrigerant will use another type such as R404, R408, R409 etc.

I'm sure that there will be drop in replacement refrigerants, but that still will come with a cost. R22 is already on a price increase but still cheaper than the drop in replacement freon. It does get confusing with the phase out of R12 and its substitutes,,,,,,,,,,,now it is going to be double the trouble with many drop in replacements for the R22. Just gotta love our EPA,,,,,,BTW R12 is still made in Mexico and several other countries that don't worry about the ozone.

 

[Coors]

Re: 13 seer a/c a-coil

The 134a is sooo much cheaper than the r12 got to be, so maybe the same thing will happen for replacing refridgerant in large systems?