Heating, Air Conditioning, Fridge, HVAC/Reversing valve

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Question
I have a 2 ton, 10 seer Trane, split heat pump system.  System was only putting out 2-3 degree differential yet air handler coil was clean.  Tech stated outside compressor freon pressure was very high and reversing valve was not functioning properly.

Outside compressor was manufactured in 1/2000 and in operation towards the end of 2000.  

Tech says success rate of replacing reversing valve is risky and replacement is best option.

Do you agree or is replacing reversing valve a cost-effective way to get a couple more years out of the system.

Thanks in advance.

Answer
Steve,
 What data did the tech give you that indicated the reversing valve?  In 30 years I have never had one go out, although I have changed a few in the past due to my boss telling me to on a unit under warranty and guess what?  It didn't cure the problem.
 I would be more inclined to say the metering device.  Those valves when they do fail don't fail part way as that one has to be able to give some work in the mode in question.  Is this im Heating?  Does in work in cooling and not heating or the other way around?  It would be very rare to fail with the valve going almost all the way across and then working in the other mode  (cooling to heating or heating to cooling). And then work good when you shift to the other mode.
 To answer your question, changing the valve is not that difficult.  You have to wrap it with heat paste and do the 4 connections " fast and ugly".  In other words get it sealed good and no time smoothing the sweat joints out and making them pretty as the valve body itself cannot exceed 200 degrees.  The danger lies in a perfecctly good valve that sticks, because that would mean there is "stuff" floating around in your system and then it is expensive, because to do it correctly so it does not happen again means changing the accumlinater, RV valve, metering device, filter and doing a very good job of cleaning the system and installing the new parts.
Let me know what Data he took to verify the valve and what the pressure readings on his gauges were in both cooling and heating modes along with the outdoor temp and indoor temp at the time he took those numbers.

Heating, Air Conditioning, Fridge, HVAC

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john t. borgman

Expertise

I am in Portland Oregon at Ben's heating 503-233-1779. I work days, so I can only answer early in the day or later in the evening. I only answer public questions for residential equipment. 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 almost 30 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.

Organizations
Refrigeration Service Engineer's Society

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, York, Goodman, Ultra boilers, Unico, Mitsubishi,Sanyo, Taylor, Nicewonger, Navien. Associates degree in Refrigeration Engineering. Certified with Energy Department, Check-me Program, P.T.C.S (performance tested comfort systems ), have N.A.T.E. certifications in gas, a/c & heat pump.

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