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under size condensing unit


fiveboroughac
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It is going to work? Hard to say, you might get lucky. Is it proper to install a 4 ton condenser on a 5 ton coil without changing the orifice or TVX on it? Absolutely not. What about using a 13 SEER condenser on a 10 SEER air handler? Nope. It's a lousy gamble with your money. Do it right.

The 4 ton has a lower refrigerant flow rate than the 5 ton. And a 4 ton 13 SEER likely has a lower refrigerant flow rate than a 4 ton 10 SEER. The 13 SEER's have larger condenser coils, smaller compressor capacity but same tonnage when joined to a matching inside unit. Your evaporator (cooling) coil will be starved for refrigerant, resulting in inadequate head pressure, bubbles in gas, reduce cooling capacity (from 4 tons), etc.

Marc

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Out of curiousity, does anyone on this forum actually complete Manual J calculations as an inspector?

I'm thinking of buying the ACCA Manual D and Manual J books and learn how to do these two calculations because I'm seeing lots of lousy duct system installations on new construction and I suspect that the tonnages aren't the best choice either.

Marc

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