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About john t. borgman
Expertise
I work days, so I can only answer early in the day or later in the evening, I live in Oregon. I have been so good at all the other area's of hvac, I am probably the only hvac guy that does not know oil. ( lol ) I am very well versed in gas, electric and heat pumps and will only answer residential applications. I have been known the past decade or so, by my employers as the guy you send when no one can figure it out. Trouble shooting is my special. I understand the physics behind air flow, refrigerants and electricity. I understand programmable t-stats, zone controls, economizers, fossil fuel kits and the engineering thought process in the wiring and construction of residential equipment
Experience
I was lucky enough to start in this field over 25 years ago as an installer, for a company that installed the best duct systems I have ever seen, even to this day. The best ,as far as understanding the way air really flows through a duct system, from the return air to the very last supply register . They also had great pride and the duct work was put in, not only to last 50 years, but to look exceptional. Then as I started doing service work, I was again fortunate that I found a 3 year engineering class being put on be a man that was the educational director for the Entire united states for a society called " the Refrigeration Service Engineering Society " And for the next 3 years I schooled at night and practiced what I learned during the day, a great advantage over schooling and then trying to remember it years later.. Versed in duct design manual J heat gain/loss calculations. Also experience in wine rooms and indoor swimming pool hvac & humidity controls
Publications
I have 2 inventions that have gone through the process and been recorded at the National Institute of Standards and Technology from start to finish and thus been invited to national innovation workshops by the dept. of Commerce and the dept. of Energy. They are waste heat recovery devices that N.I.S.T approved as valid and am currently looking for marketing partners to get this product into the hands of consumers and make a BIG difference in Energy savings for every Household and Eatery and take a big bite in the the peak hours power consumption that face our Utilities companies.
Education/Credentials
factory training in Lennox ,Rheem, Ruud ,Trane, Tempstar ,Carrier, Day&Night, Payne, Bryant, Coleman, Intertherm, Ultra boilers, Unico, Mitsubishi,Sanyo, Taylor, Nicewonger, . Associates degree in Refrigeration Engineering. Certified with Energy Department, Check-me Program, have N.A.T.E. certifications in gas, a/c & heat pump. Teach and apprentice at every company I work at.
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You are here: Experts > Home/Garden > Home Appliances > Heating, Air Conditioning, Fridge, HVAC > Compressor matching air handler
Expert: john t. borgman - 11/8/2009
Question
John,
You're so helpful I need to ask you another question. I have a 3 Ton Luxaire Compressor and it is paired to a 3.5 Ton UPG Air Handler (AHP42C3XH21A). Is this a problem? I noticed that all my other compressors are matched to the Air Handler units. The unit seems to be putting out enough cooling. thanks again. Scott btw I ordered the board for the other air handler.
Answer
Hey Scott,
What that means is that you have an air handler capable of 1,600 cfm or air across the coil. It is a multi speed motor, high is generally the setting for cooling. If you in fact have a 3.5 ton coil the extra 200 cfm is fine. If you have a 3 ton coil to match the condensing unit, it will work as well, but at about a 15% efficiency loss. Of course this all depends on the duct work. As hardly any duct work is correct and the physical numbers that are used to set the refrigerant and air flow levels are, an adjustment is always made to compensate. What it boils down to, is if a tech knows his stuff, he will set the refrigerant charge to get the maximum out of your system, ie, a fully active coil, where the refrigerant is boiled off 3/4 of the way through and condensed at the same ratio allowing the remaining 1/4 to super heat or sub cool the refrigerant for maximum effect.
Back to your question....I am unsure of the humidity levels in NY, but if they are not extreme then that set up will also work fine for moisture control. When you get over 3 tons and then start having a half ton difference here or there, the percentage, compared to the total is low enough to work ok, it is when units are mismatched and the tonnage is low enough that it is 30 or more percent of the total that you run into problems, including shortened compressor life.
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