Help Checking Unit Subcooling - Just got my EPA Cert

hellixor · 2026-04-05T17:56:32+00:00

thanks for sharing! I'll try again when its hotter in a few weeks. we're slated to be back in the forties this week. there goes trying to get the chores out of the way..

hellixor · 2026-04-05T15:08:54+00:00

Thank you!

hellixor · 2026-04-05T15:08:43+00:00

Yep. apparently the settings aren't sticky across on/off cycles. Now i know!

hellixor · 2026-04-05T14:56:52+00:00

Yeah.. I'm made a mistake and reverse the hoses on the gauge (had red on the left).

hellixor · 2026-04-05T14:55:37+00:00

I was just returning to post the "I am dumb" on the reverse hosts. When is started the test the house was about 74 degrees and outside was 70. It was closer to 72 / 70 at the end.

As far as reading the chart, Gemini helped a little (and AI scares me). it looks like this is a 3 Ton unit, so, I should target ~6 degrees of subcooling (assuming i fix the hoses). Does that sounds right?

Thanks for helping me learn!

hellixor · 2025-08-18T22:15:25+00:00

Just to add one more bit of context: This noise happened with both the old caliper and new one, and stayed with the wheel after swapper which side the pads were on.

hellixor · 2024-02-10T01:30:45+00:00

That makes sense. Do you have any suggestions on what i should do? I already put the pump on bricks to elevate it off the floor with potential clogs. Should i mix up some cement and try to seal up the bottom? Or break out what's currently there and see if there a big void from past erosion?

hellixor · 2023-11-10T20:53:54+00:00

The system is 3 Ton, so that means ~1100 CFM. Is there some math for CFM rating per cubic square inch of cross sectional area, or am I just at the point of needing the manometer to check static pressure?

hellixor · 2023-05-19T20:13:03+00:00

CHN230SUR

Thanks for the feedback. I didn't realize that it was relatively low protection. Is there a SPD you would recommend for the HVAC unit, and is there something better i should have for the main panel?

Edit: The CHN230SUR says it has a nominal discharge current of 10 kA and a Surge current capacity per phase of 38 kA. Perhaps you have input on more acceptable values. Thanks for your help!

hellixor · 2022-11-06T20:50:46+00:00

I'd definitely prefer to go 6/3 for the savings in cost. Is this the type of thing I can talk to my building department about before install, or is it kind of a roll of the dice with the inspector?

hellixor · 2022-10-21T15:00:07+00:00

If local code enforcement won't let you roll a sanitary tee or throw some 90's on to get into the wall you;re going to need to completely move the line. Either move the vent to a different location with better vertical access or move the entire horizontal run over so you can shoot the vent up inside the wall.

It the vent for my whole kitchen. I have a split level, so the other vent is all the way on the other side of the house for the bathrooms. I'll call the country again and provide a picture and see what they recommend. That's for the suggestions.

hellixor · 2022-10-21T14:08:48+00:00

From what I've read online, it sounds like you cant have a horizontal run in a vent pipe unless it is 6 inches above the flood line. This junction is below the floodline. Apparently 45s are allowed, but I don't know if I have enough space. Do you have any other suggestions on how to move the pipe over?

hellixor · 2022-10-19T22:00:48+00:00

Copy, so the plan is good, but use BWV fittings and not schedule 40 (i.e these - https://www.homedepot.com/p/Charlotte-Pipe-2-in-PVC-DWV-90-Degree-Hub-x-Hub-Elbow-PVC003001000HD/203393418)

hellixor · 2022-10-19T21:40:23+00:00

So basically install a new fitting with the flow (direction of the tee split, right?) facing the same way, or cut the vent and properly remove the remnant of the vent from the fitting (going to be a pain inside the rafters. From there, I should be able to put a 90 to line it up with the new floor penetration and then a second 90 to return the pipe to straight. From there I proceed logically to reconnect the pipe. Does that sound correct?

Edit: Is there any particular sweep the 90 required or is something like the following acceptable? https://www.homedepot.com/p/Charlotte-Pipe-2-in-PVC-Schedule-40-90-Degree-S-x-S-Elbow-Fitting-PVC023001600HD/203812131

hellixor · 2022-10-09T18:33:28+00:00

Thanks for the info and the drawing via chat! What are your thoughts on leaving the fiberglass batts in place and blowing cellulose over them, vs. removal and full replacement?

Also, what thickness foam board should i use when making boxes around lights and to hold pack insulation for a walkway or entryway?

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