THPRE

**garyed** · 01-29-2013, 08:05 PM

Originally Posted by crmont

Nope. Take that off the list.

Why?

A bad txv at the outside unit can cause high head pressure just like he's seeing & still work fine in cooling. We haven't been given any SH, SC or even suction pressure measurements so that leaves a few possibilities besides just air flow until we get them.

**garyed** · 01-29-2013, 08:23 PM

Originally Posted by THPRE

Gary - I have had supposed experts out -- I should not say supposed - they impressed me with their knowledge and equiptment. The problem was that Goodman would not discuss much with anyone except the original installer. The only thing they would do was to verify that the units should work together. So if I want any warranty I have to go through things with my original installer. Thus the phone conferences. And since they just stonewall me I'm on this site to gain knowledge. And I am learning form all these answers. So Thanks to all! THPRE

You should not have to use the original installer to do the warranty on any Goodman equipment. As long as you use a licensed HVAC contractor there shouldn't be any problem with Goodman honoring the parts warranty. I do warranty on Goodman units all the time that I didn't install. Goodman is the easiest of any manufacturer I've ever dealt with to get warranty parts from so I don't understand why you're having such a hard time finding anyone who can handle any warranty on your equipment. Now if you're talking about a labor warranty or a part that failed because of improper installation that's a different story.

**crmont** · 01-30-2013, 03:26 AM

Originally Posted by garyed

Why?

A bad txv at the outside unit can cause high head pressure.....

Because it's very rare and easily diagnosed.

**vstech** · 01-30-2013, 08:30 AM

Originally Posted by THPRE

OK I go for that. But the air flow in the house seems suficient. Warms the house quickly enough. It is moving enough air to cause the inner door to be forced open. It is always left open anyway. I don't have the numbers from the tests here so will look at home again. Thanks , THPRE

... which door are you saying is being forced?
it's very simple. a 4 ton heat pump needs 1600cfm of airflow. that's air moving across the coil. if the ductwork is not sized properly to PERFECTLY flow air throughout the house, NOT ADEQUATELY, but PERFECTLY the VS blower will just spin faster, and faster in it's attempt to get the air to move across it. and no matter how hard you blow into a coke bottle, the air won't flow unless you give it a path large enough...
2500 square feet should have at LEAST 2 returns with filters in them, with ducts large enough to flow the air at a low enough pressure to allow it to move with the blower provided.

you mention 3 16" ducts feeding the 3 sections of in floor ductwork... what size is the duct the 16"ers are connected to on each end?

**vstech** · 01-30-2013, 08:32 AM

PRESSURE and AIRFLOW are not the same...
a home blower is designed ONLY for a certain amount of pressure, and if the airflow at that pressure is too low, you do not get a functional SYSTEM.

**THPRE** · 01-30-2013, 10:08 AM

The inside tx valve has been replaced twice and the outside one once.Also the drier but not the reciever. I think the suction was at 180 but I was fixated on the 610 high side. None of the changes to mechanical components or changes to the air flow have made any difference to the functioning of the refergeration system - except of course taking refergerant out and adding it back next season. Air flow changes of course made the house warm up or cool down more quickly and allowed the heat pump to run less. But the basic problem has remained the same.

**garyed** · 01-30-2013, 10:11 AM

Originally Posted by crmont

Because it's very rare and easily diagnosed.

Easily diagnosed for you maybe but that doesn't mean it would be for whoever is working on this unit. They've already changed the indoor TXV twice trying to fix this problem when supposedly the cooling was working fine. Something just doesn't add up here so I wouldn't assume anything at this point. I just saw the OP's post about the suction at 180 psi. If that's correct then it would have to be either overcharged, not enough air over the indoor coil or the coil is too small.

**THPRE** · 01-30-2013, 10:29 AM

I am already paying out for labor for all the testing and checking , I would be happy enough to pay labor to have it fixed. Maybe Goodman was just saying they would only gaurantee labor with the original installer. I know for sure that Goodman told me they would only deal with the original installer. That was in response to a phone call and an internet inquiry.

**THPRE** · 01-30-2013, 10:51 AM

VSTEC; I was not very specific on the door bit. Picture a rectangular room with a door at each end and the air handler in an inclosure on one side. One door to the outside and one door to the inside of the house. The inside door is what I was refering to. It is a normal 36 in door with a louvered grill in the bottom half of the dooor. This door fights being closed when the fan is running. The outside door does the same thing. I do not know the size of the three main trunks that the soft ducts are connected to. they are steel and rectangular but I don't know thwe dimensions. I guess I could cut another opening in the cabinet above the air handler and add another filter and grill. But with .05 as a max. static pressure in the return area is that needed? That was a maximum - with the out side vent in the top of the closet open it is less so the .30 total static pressures I mentioned are the highes experienced not the lowest. Thanks,THPRE

**crmont** · 01-30-2013, 11:17 AM

The outdoor txv has been replaced and was never the problem anyway.

I'm still waiting for a picture of the coil section of the air handler. I still think the coil is 90 degrees off.

**THPRE** · 01-30-2013, 11:38 AM

CRMONT; I am sorry about the pictures. The tx valve does fit in the cabinet and is normally closed and out of sight. The air handler is not square , it is 24 3/4 by 21 1/2 so it would be noticable if it were 90 degrees off. I'm not at home today so can't take better pictures.

**vstech** · 01-30-2013, 05:21 PM

Originally Posted by THPRE

VSTEC; I was not very specific on the door bit. Picture a rectangular room with a door at each end and the air handler in an inclosure on one side. One door to the outside and one door to the inside of the house. The inside door is what I was refering to. It is a normal 36 in door with a louvered grill in the bottom half of the dooor. This door fights being closed when the fan is running. The outside door does the same thing. I do not know the size of the three main trunks that the soft ducts are connected to. they are steel and rectangular but I don't know thwe dimensions. I guess I could cut another opening in the cabinet above the air handler and add another filter and grill. But with .05 as a max. static pressure in the return area is that needed? That was a maximum - with the out side vent in the top of the closet open it is less so the .30 total static pressures I mentioned are the highes experienced not the lowest. Thanks,THPRE

where are you getting this .05 max return static number from?