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Definitely going to add porright before and after indoor coil.also, before and after drier. may just swap out LL service valve, just for the fact thats where I saw ice beginning to form in the...

I did. That's the puzzling thing. In cooling, I have good pressures, good subcooling 12, good indoor temp differential. In heating, 240 psi on the 3/4 line, pulling down to 50 psi on 3/8 line. I've...

Cool thx. That confirms that that reading is after the piston. I did take a reading on the true suction port and it was the same,dropping down to around 50 psi, then the. comprssor getting noisy and...

Thx again for everyones time. Ill be sure to update. Feel free to throw 2 cents in anytime. Thx

Interested in other thoughts myself. Ron appreciate your interes and input. I will definitely post my findings. I think were thinking along the same lines. My next move is to cut a port after the...

Continuing to brainstorm. If I'm reading this drop at my 3/8 line valve port, this would eliminate my outdoor coilI which is my evaporator in heating mode) from having a restriction because the port...

I did check 3/4 line in heating and pressure stayed steady at 240 psi. Also, that's why I'm puzzled too. I would say that restriction is at that port too,, according to my findings. Again, I coudl...

I did have high side gauge on 3/4 line and low gauge on 3/8. Same deal, with it going from equalized pressure to large pressure drop across coil, 240 on 3/4 line agin dropping down to 50 psi on 3/8...

I would love to live with this pressure drop being normal in my case, however the noise the compressor makes and then it trips out, I guess on internal overload. I haven't checked screen though to be...

I was thinking gauge port was reading after piston, because piston is installed before flare union. Wasn't. Positve though. Either way it seemed problem was at one of the metering devices. I believed...

I'm sorry, I did take subcooling reading, not superheat. And that was 12. Carrier did say that both their carrier and payne ahu come with txvs meant for heat pumps. so I know its the proper one. The...

Here's where I'm at. Returned today, with a little more time to diagnose but again came up empty. So more suggestions or help is appreciated. replaced the expansion valve, replaced filter drier, and...

No, no, its all good. I appreciate the interest, and the help. Thx.

I know, I didn't have the gauges hooked up properly. I just finished pressure testing and evacuating the system with them hooked up this way, and left them when I started the system. My concern was...

Definitely will follow up after to talking to carrier Monday. Sounds like I must have the wrong one. Or faulty. Id like to see it be the wrong one, instead of a new faulty one. Thx again

Thx for clarifying, I had to reread the first reply a couple of times. So it looks like I have to definetly check into that indoor txv.

I do know that both units are manufactured by payne and are 1.5tons. So I guess they are matched properly. Also, any metering devices that come factory are still present. It kills me to have to wait...

You are correct in saying the only thing I am measuring is the indoor coil. The indoor metering device is a txv valve. I'm not sure, to be honest, if it a heatpump txv valve. It wouldn't need to be...

My high side gauge was on the 3/8 line. Low was on the 3/4. I was getting a reading +250 into the retard range on the 3/4. On the 3/8 it was immediately pulling down, around 50 psi I would kill the...

Right on, there is a flare connection on the liquid line service valve. This is where I had my high side gauge hooked up, where I was reading it drop down to 50 psi. Ill try pumping the refrigerant...

The ah and condenser are brand new. Not sureabout liquid valve having a piston. Its abrand new install. Ill have to check in with carrier Monday to see if ah has a heat pump txv valve installed from...

Chuck, appreciate the input. I was thinking along those lines. Do you need to change out the txv in an airhandler to a specific heat pump txv. Wasn't sure. I am sure that hasn't been done, if need be...

I apologize, Let me correct myself. The high side wasn't pulling into a vacuum. It was rapidly pulling down though. Once it reached around 50 psi, the hissing began along with the marbles in the...

Went to start up a payne 13 seer, 410a heat pump in the heating mode today and my high side gauge was pulling down to a vacuum, while the compressor began to hiss and sound like it had marbles in it....

No I didn't say it was icing, probably should have. I wasn't asking whether or not I should put refrigerant into an empty system. Im good there.