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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 - 11/4/2009
Question
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.
---------- FOLLOW-UP ----------
QUESTION: John, Thanks - it doesn't use electric heat and once I checked the manual, it looks like it potentially could be a jumper that is miset. the ohm meter is a good idea - I'll try that. i'm just dreading crawling up into the crawspace with a head lamp - a real pain.
Thanks for your help.
Scott
ANSWER: Scott,
I was not referring to electric heat, just possible safeties for your heat source and ditto on the crawl, I have to do it all the time. Good luck
---------- FOLLOW-UP ----------
QUESTION: John, So I crawled up there tonight. the LED showed the unit was operating properly (2s On 2s OFF). I checked the heat relays and none of them were powered. I cycled the unit on and off a few times, still fan would not stop blowing. I disconnected the thermostat wire to the Green and Red to make sure they weren't shorted - still did not stop. Checked to make sure all jumpers were in proper location which they were. Am I correct to assume that the Blower Relay is continuously being powered no matter what? is there a way to mis wire AC power to the unit that would cause this? The unit has been running like this for a year - does it really matter if it is stuck on or is this something I need to get on top of? thanks again
Answer
Scott,
You did not tell me that it was that way for a year!!! The fan runs when there is power to it. It can be wired hot ( continuous) or through a relay. If it is through a relay, it is usually a 24 volt coil or through a board. It either gets its power on a call for fan or when there is a overheat problem that causes it to stay on to cool down. Not knowing what you have wired up, means all a person can do is look and see.
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