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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 > Electric Furnace with strange cycle
Expert: john t. borgman - 11/9/2009
Question
Hello John,
I have a airforce central heat/air conditioning.
The Furnace is a YORK model N4AHD14A06A (located in the house)
The Heat Pump is a Lennox (located outside the house)
Both are connected to a control panel White Rogers, this panel has 4 positions:
1) COOL
2) HEAT (in this position, when the temperature outside is above 27 Fahrenheit, the heatpump will be running to provide heating. Below 27F, the furnace will take over automatically)
3) OFF
4) EMERGENCY (Bypass the heatpump to heat directly with the furnace)
Right now, I set the switch to HEAT, I set the temperature to 70F. Normally, when the temperature in the house reach 70F. The heating (fan) would stop running.
For the past two days, when it reach the desired temperature 70F. The fan would stop. The every 90 to 120 seconds, it would start running for 7 to 8 seconds, then it stops for 90-120 seconds then it start running for 7 to 8 seconds. And it keeps this infernal cycle.
I even tried to put the switch on the control panel to STOP but the cycle keep going. The only way to stop is to switch of the Bottom breaker on the furnace. (The Top breaker would switch of the control panel)
I need your advise.
Best regards
Thong
Answer
Thong,
It sounds like you probably have a mechanical fan/limit switch that is in need of replacing. But first check your filter to make sure it is not clogged and the furnace is not getting all the heat off at the end of the cycle. But if it continuous for a long time after it reaches temperature it is probably that device. The only other thing that it could be is a faulty control board on your furnace. The reason for the 2 guesses is that Canada and the US have slightly different units and I am unsure which York controls are in yours
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