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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 > Air Handler
Expert: john t. borgman - 11/3/2009
Question
Hi John,
I have a UPG Model MA Modular non-variable speed air handler. It is hooked up with ac and forced air for heat (over water pipes). The fan stays on constantly. It provides heating and cooling but the fan never shuts off. I pulled the thermostat off and the fan still runs - I figured that should break the signal to the fan motor is the problem was the thermostat. I checked the manual and it said there is a "fan on lock condition" which would cause the fan motor to stay on. However, it looks like that condition relates to electric heat which I don't have. For the themostat I only have the R, G, Y, and W hooked up - no COM. I haven't crawled up to the air handler yet because it is in a really tight crawl space with little working room. Any ideas or do you need more info. thanks
Answer
Scott,
The fan gets it's power through the G wire and the tstat has a fan ON/Auto position. If those are not the problem then at the air handler there are limit switches that will lock the fan on, because the unit is overheating, some are manual reset some are not. That unit might also have a mechanical switch to energize the fan on a call for heat which could be stuck. You will just have to look, or better yet, if you have an ohm meter and know how to use it, check the limits and switches.
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