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pecmsg and ksefan, Great idea with the whole home dehumidifier with fresh air.

Kdean1, Absolutely the system is oversized. Background information:
The original equipment in the home was 125 BTU...

The equipment is Luxaire, R-410A Condenser Model # AL21B4821S, A-Coil Model # CM49CE3A1, and Gas Furnace Model # TM8V100C16MP12 installed in March 2020. There hasn’t been any issues with freeze up....

Looking to improve moisture removal on a communicating system. The AC has an inverter condenser unit and EEV evaporator coil. Furnace is a 2 stage variable speed unit. It is an AHRI matching system....

I will program the Santa Fe controller to provide fresh air as recommended in the load calculation. Can the Santa Fe controllers also be set up some way to program fresh air when when make up air is...

My daughter and son-in-law are gutting and renovating a home. The home is a 92’ long rancher with a 16” high living room in the center. The walls and roof rafters will be spray foamed. The home will...

Update: Shellcamp, it looks like you identified the problem. There is about 1-1/2” of exposed suction piping without insulation. This is right where the piping enters the encased coil. The rust spot...

Thanks for all the responses. This is a horizontal, left installation for Luxaire coil and furnace. Furnace is TM8V100C16MP12 with CM49CE3A1 coil.
The “drain pan” in my original post is a...

Thanks to the knowledgeable Pros on this site. My HVAC system was replaced about 2 years years ago with a lot of advice from HVAC talk members.
My condensate pan is starting to rust. The unit is a...

Foam strips is a great tip and a lot less mess. Thanks

Mgenius33,
Thanks for that info about sealing between supply box and drywall. Not sure if that was done but think it wasn’t. Will check that out and caulk as necessary. Is 100% silicone a choice for...

SS120396,
Thanks for responding. The house is 2,000 square feet. There is photo of the meter in the attached report showing 1,735 CFM. If this helps.

Had a a lot of work done on replacing and upgrading my HVAC system a while ago with a lot of help from the knowledgeable folks on this site. The local electrical utility (PSO) provided a significant...

Thanks to all your comments on the static pressure test. Yes, the test port for the supply was located past the coil. I made a new test port location at the end of the furnace (below the coil). New...

BNME8EZ: thanks for the analysis on the temperature rise. I will put this on the list for the contractor to address.

The attached photos were taken during the installation and thus not completed. The plenum are lined internally, dampers are manual, R-8 insulation was subsequently applied for all ductwork. Yes - all...

Adelberts-Protege and beenthere: the lightbulb finally went on - no way the static pressure is correct. Don’t know how it went wrong. According to the contractor the test port were in the correct...

Thank you for responding. I will try to respond to the comments as best I can.
Beenthere: CFM was 1605 based on air flow data table for furnace and jumper settings. Test ports were located in the...

Here goes trying to attach the commissioning report. This system has not run much due to the current moderate temperatures. I do have dampers on all the takeoffs but will wait for higher temperatures...

Yes,
The old system was only pushing about 3.5 tons and it was screaming loud with the main return located near the living/tv room. The static pressure now is 0.11 the contractor said this is the...

It’s been a long time, but finally got my system updated. Could not find any contractor that was willing to do a static pressure test so performed myself. Static was .55 on the return and .26 on the...

Pecmsg and flicks, both present good points and agree there is no perfect system. Don’t want get a complicated system with variable speed where a lot of technicians may not be familiar wither the...

There are 2 issues with being slightly undersized. First is the fear of being undersized and sweating each summer for the next 10 years. My current system cycles for about 20 - 25 minutes at a time...

I have a previous thread about about changing out my current 5 ton system to a 3 ton system based on a whole house load calculation. Still trying to get a contractor to perform static testing on...

Thanks for reiterating the static test that BNME8EZ also mentioned. I will ask a contractor to perform the test and record for this board to review. Are two values all that is needed - entering the...

Teddy bear,
Thanks for the response. One contractor slowed down the fan 2 stages in an attempt to lower the return noise. He said it was set on the highest speed but didn’t want to slow it down any...

Bazooka Joey,
Yes, I will be looking for the AHRI number for the system. What is frustrating about this replacement issue is that no local contractor seems interested in load calculations. It seems...

Thanks BNME8EZ.
Each contractor turned on the blower. One contractor turned down the blower speed. No one mentioned static pressure. Is a static pressure test on existing system a useful test method...

We bought a new home (built in 2003) about 8 months ago with a 5 ton AC and a 125k 80% furnace. At the time I realized AC and furnace were likely oversized but had the system inspected prior to...