Day 4 Update: I'm well into phase 2 which is the heat pump portion of the install. Yesterday I removed the old HP and brought the new HP to the site and set it on a new condenser pad. Today's fun project was crawling thru my crawlspace removing old refrigerant line and installing a new 50' lineset. My wife fed me the tubing thru a conduit feedthru I made thru the foundation of my garage right next to the air handler. Surprise #1 The lineset went thru the conduit just fine but hit a stub of a 2X4 hanging below a beam in the crawlspace. It was just a spacer for a water pipe but as luck would have it it was perfectly in line with the conduit feedthru. That was fun cutting off the stub laying on my back. Threading the lineset was slow going because the route was S shaped instead of a straight shot. I had to gradually bend the shape after every 4-5' was fed thru. It's now hung and tie wrapped with nice gradual bends. This time I got lucky since I have about 1-2' extra from a 50' spool. Surprise #2 It was really nice of Mueller to provide a 90 degree ell in the end of the lineset. However it now points 180 degrees from where it needs to to connect to the air handler. Trying to turn 50' of installed lineset 180 degrees just won't happen. I'll guess I'll just have to use a street elbow fitting. Next weekends fun project with be brazing all connections and doing leak testing, evacuation, final charge and checkout. Doing a project like this gives me newfound respect for the pros that do this type of work day in day out.

Tiger, I made the dip switch adjustment to cut off Comfort R but forgot to run a wire from the Bk terminal in the air handler back to the DHM2 terminal on the EIM. Hopefully when I do that I will see the improvement I am looking for. But I have another question. You guys said to turn the fan to the auto position because if the fan is running all the time it would be blowing air across cool moist air causing humidity to rise. I believe that is right. I have mine in the auto position, but what if my whole house air purifier is being run up to 30 minutes every hour which is causing the fan to run that often as well? Would that basically be the same as running the fan all the time which would cause humidity to rise? My wife has asthma and I try to keep the air as clean as possible. Would I be better off just letting the air cleaner run when ever the a/c came on?

I am in agreement with everyone, the unit is old but as stated, was purchased by TRANE. However, the relays and other supporting parts are readily available. If I'm correct, I think Tigerdunes was pointing in the right direction. If you are not familiar with heating with heat pumps, then the air coming from the vents while in the heat pump mode alone, would feel cool to you. One thing you mentioned was that while it was in the heat pump mode, you did not measure voltage to the element. That would be normal. When the unit calls for AUX or Emerg. heat, then you would get a voltage to the heaters. Here's what I think is happening....the reversing valve is stuck...it was common on the older units. The unit stays in the cooling mode and when the first bank of heaters comes on, the cool air overcomes the full effect of the heater. Check the air coming from the outside unit. If it is warm and that will confirm the possibility of a stuck reversing valve. As mentioned also by Tigerdunes, replacing a reversing valve is expensive and given the age of your unit, whole replacement of the unit would be a better choice. Now a professional should be called however, I'll give you one thing you can try, if indeed it is still in the A/C mode. You can force the valve to slide into the heat mode by doing this.....disconnect the blower at the condenser. Turn the unit on in the heat pump mode and let it run....Given your temperatures, the condenser will slowly build pressure on one side of the valve as the pressure drops on the other side. You'll know you are getting close when you hear the compressor staring to load up. You'll suddenly hear a whoosh and the reversing valve has now reversed. Let it run for about a minute to make sure it has fully reversed. Shut the unit downand hook the fan back up. When the unit goes into the defrost mode, the valve may work and the unit defrosts but may not switch back to heat mode (sometimes they do, sometimes they don't.) If that's the case, you have to do it all over. This suggestion is just to get you some heat until you get someone out.

Yes, an ice block can stop air flow. A fan cant push air through a wall of ice. Have it looked at by a pro. There are multiple things that cause ice. And that is not a normal amount of ice btw. http://www.calldougs.com/article/what-causes-an-air-conditioner-to-ice-up