The home is a 2500sqft ist floor with exposed basement ICF. I went with a geo contractor that I thought had a great designer but now I have questions on. The home is 90% complete and has the following components in the HVAC system. 3.5 ton envision waterfurnace, renewaire EV300 energy exchange ventilator, honeywell dh150 de-humidifier, axial fan bathroom ventilator. The designer was a really nice guy and seemed really concerned about getting the job "right". Late last year he "retired". The contractor then seemed to almost abandon the job. The system was ducted and installed partially and the ac portion of the system was started along with the evr and the de-humidifier. It ran and the house seemed relatively ok while we were finishing construction but it seemed to me like there were a lot of odors in the house and even though the evr was running I could never feel any type of flow from any of the ducts. When we tried to go to heat, the system didn't heat. I was looking at it myself and happened to look at the ducting and noticed that the contractor had constructed a rather large plenum box right outside the return air to the waterfurnace. He ran the erv intake and outlet into this box along with the de-humidifier intake and output. All told the inlets and outlets from both the erv and de-humidifier are less than 18" from each other and on top of it there is a 12" return line that is only a foot long connectected to this box. The rest of the return system from the house is in a long trunk line at least 50' long. Correct me if I'm stupid but it seems to me that both the erv and the de-humidifier will simply short circuit in the box and the waterfurnace will pull all of its return air from the 12" duct that is 2' long rather than try to suck from a 50' line with many branches. The designerless contractor simply says "oh, don't worry it will be ok". I think I need a true HVAC engineer to come and evaluate the system and sort out what is right and wrong. I spent almost 40K on this system and the contractor is a large going firm that has the resource to correct the problems or at worst afford the lawsuit that this may bring. I was stupid for being so trustworthy so long but, I did it. Now I have to make sure its right. I know the components are good it's just the ducting and airflow that need to be verified. The hose has a basement and everything can be re-done if necessary. I am looking for a good HVAC engineer to come and evaluate this thing. Thanks in advance for your suggestions. I am located in upstate SC.

Check this link out regarding ERV setup.
http://www.onetrane.com/pdf/ervginst.pdf
Toward the end of the document they give a few examples. The example you are explaining is "not approved" unless there is a backdraft damper installed between the "room air" (inside air being blown outside by the ERV) and the "fresh air (outside air being blown in by the ERV)." This is on page 12.

Do you know if there is a backdraft damper installed?

What odors are you noticing?
What is your relative humidity?
Is your dehumidifier pulling a moisture out?
Did you fix the heat problem?

I just came off a situation where a whole house dehu was short circuited, though not as severely as this one seems to be.

Central dehus are often an expensive bandaid applied to a poorly built house or poorly designed / installed HVAC system.

In addition to the questionable setup, you mention the system was run before construction was complete. A separate issue I wonder about is whether or not there is construction dust from drywall, sawdust, etc. that might clog your filters and/or contaminate the coils. You might want to have the system checked out before final acceptance.

Along with fixing the obviously short circuited ERV and Dehu you'll want someone to perform at least rudimentary test and balance work on the duct system. Depending upon the layout of the home it might have been better to group bedroom returns into a box over a hallway and then allow the hallway to act as a return, it having far less restriction to flow than a 50 foot duct.

Site unseen, it is hard to give good advice. You need expert boots on the ground. There's a better than even chance that your problems have nothing to do with WaterFurnace and everything to do with a poor installation.

You might want to seek a good, well-equipped energy auditor or rater (rather than a competing HVAC contractor) to generate a report of deficiencies and then offer the contractor the chance to correct the problems.

You are too kind curt. How 'bout there is a hundred percent chance the installer screwed up and little chance there is anything significantly wrong with the heat pump.