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The latest on this - a new company (paid for by Carrier) came out a couple of weeks ago, and measured CFM by measuring gas flow at the gas meter outside and return/supply air temps. They were...

Yea, its a Carrier Infinity, so I can see it logged on the controller interface. Suction pressure is about 150psi when it trips, so its not even close to the set point of 50psi for low pressure...

R410a with TXV - After a 4" spacer was installed between my evaporator and furnace, the tech added a little 410a, but I suspect he overcharged. Subcooling is about 17F (nameplate calls for 15F, so...

Nothing yet, but I'll have an update next Wed. I'm working with the same Carrier rep, and have been able to communicate directly with him. But I decided to go with another HVAC contractor. I...

Another observation when my evaporator was replaced. King valve at the condenser had no cooling when the filter dryer was brazed in, but he did do a good job of cooling the TXV. Whats the best...

My Carrier Infinity has a 50psig low pressure cutout. When the tech did a pump down a couple of weeks ago, to replace my evaporator, I noticed that he didn't bypass the cutout, and I don't think he...

OK, another update. 4" spacer installed between the air handler and the N coil evaporator. No difference. And unfortunately, they didn't bring a new compressor.

I'm standing by for round 3.

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First he looked at the furnace and coil, and had pretty much concluded that spacer was the problem, but he also talked about moving the txv sensing bulb outside the coil case.

Went outside to...

Another update, and hopefully we are moving in the right direction. Finally got the Carrier service rep out here, and I was impressed - he definitely seemed to know his stuff.

He said that I...

Yea, I probably could have been a little more diligent about finding a company who does more thorough testing. Every time I complained, we attributed poor performance to flex duct temperature...

OK, here is the latest on this issue. Based on the info my local HVAC contractor passed to Carrier, Carrier concluded the TXV was bad. It was just in the 5 year parts warranty, so Carrier paid...

I'm probably having my Carrier CNPVP evaporator replaced. Contractor says I can get the aluminum coil at the same price as the copper. Someone else mentioned the tin coated copper coil - I see...

CNPVP4821ACAABAA

I'm getting an in-warranty replacement of the TXV in a Carrier CNPVP N coil which has been in use for 5 years.

I'm not that concerned about the rusty evaporator (see attached pic) because I...

The latest on this. My local HVAC company has conferred with Carrier, and they believe the TXV is bad. Carrier had them come back out and double check the amp draw on the compressor, since these...

Beginning to wonder that myself. I know this company has had some turnover lately, so I'm not sure how good their Carrier expertise is anymore (not a big company, so I know that must be a...

I got similar numbers (about 26,000 btu/hr) for both. I'm using that Psychometrics app for iphone/android (maybe the same one your using), which also seems to match the regular enthalpy charts that...

Interesting thought there - I knew that about the Bristol/reverse direction compressor, but never thought about the mechanism that picks up the 2nd cylinder - being broken. I wonder if the amp draw...

I think on the Infinity systems with Infinity controller, that 1400 is by design, and is not adjustable other than 350cfm/ton when set to efficiency, 400cfm/ton when set to maximum. (this is a 4 ton...

Yea - long thread on that topic, and I guess that is what has prevented them from being able to quickly fix this. (and going to local Carrier for help). They've already noted that compressor amp...

After purchasing both of these, here are my quick observations:

Supco DSP-1000
CON:
- Display is smaller and harder to read
- Short probe (not as suitable for sticking in duct work)
PRO:
-...

Just an update on this, or lack of update. (Carrier Infinity supply air temp goes up from low to high stage, suction pressure goes up - good performance at low stage) Original thread:...

Still working good today - no complaints, but I bet it will be back. I just have to figure out how to present this to the HVAC contractor so that they believe me.

I can comprehend "debris...

Its still working fine this evening. I watched it shift from 1st to 2nd stage, supply air temp went down (opposite of what I usually experience). At the evap: Return Air Temp: 79, Supply Air...