Mismatched AC Coil and Condenser

Old 05-22-08, 03:26 PM
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Mismatched AC Coil and Condenser

I had a bad leak in my AC coil ( Carrier CE3AXA042000ABAA 3.5 Ton) unit. I got several quotes to replace it and decided to go with a company that said that they with replace the coil with another Carrier coil that has a 10-year warranty for $1200. I was at work when they arrived and they had already removed the old coil and were hooking up the new coil. The new coil is a 4.0 Ton Comfortmaker model ( EHD2x48AA2 ) instead of a 3.5 Ton Carrier unit. The tech said that Comfortmaker and Carrier were made by the same company. I also asked him about the coil being a 4 Ton and not being matched with my Condenser being a ( York HACB042506A 3.5 Ton) unit, and he said that it was ok, and that was what they used to do to increase systems efficiency. Apparently the system also only has a 5-year warranty instead of a 10-year warranty. He had the Tech write on the ticket “10-year warranty for defects and 1-year labor warranty” and said that he would personally guarantee the additional 5 years. Am I being ripped off or not, and if so what should I do.
Old 05-22-08, 04:29 PM
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The tech is correct.
Having a coil of a smaller capacity than the outdoor unit is a NO GO, but the other way around does help improve the seer (efficiency).
Old 05-25-08, 11:20 AM
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The extra half ton coil size will be okay providing the refrigerant control metering device is matched to the condenser's capacity & not the evaporators larger capacity.

I would have advised you to install a Thermostatic Expansion Valve (TXV) metering device! TXV's adjust to the heatload that is put through the evaporator for optimal Superheat setpoint & efficient operation. TXV's also provide better protection against liquid refrigerant slugging of the compressor.


Last edited by GregH; 05-25-08 at 11:34 AM. Reason: Links to personal websites not permitted.............Please read our rules!

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