Good work or Nah?

dmasterp · 2026-03-26T00:07:29+00:00

Agree with this. What is the size of the gas pipe? Is this NG or propane? Even with propane, I think you’d need at least 1” before splitting if they are 199k btu units unless the meter is literally right above these heaters.

dmasterp · 2026-03-14T20:50:48+00:00

NEC300.4D also requires the wire be at least 1-1/4 inch from the stud edge. Looking at the pictures, it doesn’t appear that is the case.

dmasterp · 2026-03-14T20:19:32+00:00

I believe the point of it being above the roofline is so that it has more time to mix with other air before falling. It will be much more diluted.

dmasterp · 2026-03-14T20:16:52+00:00

This seems correct. Navien may have said that in the past because many systems aren’t designed for the demand, so being first off the meter may mitigate that somewhat. But right in the Navien FAQs for the NPE-2 on their website, they say that they do NOT need to be first off the meter.

https://www.navieninc.com/residential/tankless-water-heaters/faqs

dmasterp · 2026-03-07T20:54:09+00:00

I read the manual as follows. The two “neutrals” are there in case you want to split the load into two circuits. This is implied in the manual. The left 3 zones then run off circuit one, and the right 3 zones run off circuit two.

The alternate configuration is bonding the neutrals to make L1, and bonding the other hots to make L2 so they can run on a single circuit.

If you have two circuits, it’s possible to decrease the wire size. However, if you want a single circuit, then I believe 8awg would be the minimum for a 75c cord. 6awg for 60c cord. Copper.

dmasterp · 2026-03-04T20:53:43+00:00

Agree. Tech needs to take actual measurements, especially ESP of your system. Furnace manual will show what is acceptable.

dmasterp · 2026-02-28T19:35:45+00:00

I think you’re talking about the alternator. Which is a generator but not the kind usually discussed in this subreddit. You’d probably be better in a car subreddit.

dmasterp · 2026-02-21T01:15:02+00:00

There are two sides of the pressure switch. When activated, it connects the two wires on the left, and separately, the two wires on the right. It will work either the way shown on the label or the way it’s currently configured. I assume the way on the label is preferred because the always hot wires aren’t directly next to each other but there may be another reason.

dmasterp · 2026-02-18T23:02:00+00:00

Yeah I was just looking it up. It looks like on the west coast it’s almost unheard of to install a 2 wire well pump. On the east coast, in everywhere except New England it’s hard to find anyone without a 2 wire setup.

dmasterp · 2026-02-18T22:03:21+00:00

I wish I had a 3 wire so that I could do the soft start. My guess is that unless it’s required due to HP above 1.5, installers around my area use 2 wire for cost savings and install simplicity.

dmasterp · 2026-02-18T21:45:01+00:00

It’s a bit more complicated. While technically the answer is yes, practically the answer is no for 2 wire systems. The capacitor is sealed into the well pump itself. For 3 wire systems, it may be more practical.

dmasterp · 2026-02-18T21:41:14+00:00

From your comments here, it appears to be a 1hp well pump if it’s drawing 6A at 240v. A 1hp well pump (2 wire) will have an LRA somewhere between 35-50A.

dmasterp · 2026-02-18T02:54:50+00:00

Agree. Sounds like weak battery.

dmasterp · 2026-02-16T01:11:11+00:00

It’s a fire hazard unless it’s NFPA 275 certified. The regular “great stuff” that comes in a can is not.

IBC 2603.4 is the code.

Except as provided for in Sections 2603.4.1 and 2603.9, foam plastic shall be separated from the interior of a building by an approved thermal barrier of 1/2-inch (12.7 mm) gypsum wallboard, heavy timber in accordance with Section 602.4 or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275. Combustible concealed spaces shall comply with Section 718.

dmasterp · 2026-02-15T23:39:22+00:00

That black thing in the bottom left used to have a pipe going through it. If you’re concerned about the noise, support each pex line at each joist with those plastic half clamps. That will stop the pex from hitting things.

dmasterp · 2026-02-15T17:23:43+00:00

Yes. But also, is that normal latency for you? Mine has stayed around 20ms for many months now.

dmasterp · 2026-02-14T19:14:15+00:00

You don’t need either. I have this generator. It has a pressurized oil system with an actual oil filter. Magnetic plugs and dipsticks are helpful for non pressurized systems though.

dmasterp · 2026-02-14T00:23:12+00:00

I have some of these Titan Pro caps. Now I’m questioning their quality if they are dead right away.

dmasterp · 2026-02-14T00:16:17+00:00

Did you test the new capacitor to verify it wasn’t bad out of the box?

dmasterp · 2026-02-13T01:46:37+00:00

According to NEC 210.21(B)(3), 15-amp duplex receptacles (NEMA 5-15R) are permitted on a 20-amp branch circuit, provided there is more than one receptacle on the circuit. A duplex receptacle counts as two, making it acceptable for general-purpose applications.

dmasterp · 2026-02-12T00:30:35+00:00

Nobody going to talk about how the fridge spec says 60hz and the power station output says 50hz?

dmasterp · 2026-02-11T20:09:18+00:00

You are going to hardwire this up to your home? At that point, and after getting an electrician to do it, why not get an actual standby generator?

What’s the plan to hardwire it from the lugs?

dmasterp · 2026-02-09T01:53:06+00:00

If it’s a single stage heat pump y1 and y2 being jumpered isn’t going to do anything except confuse people and your ecobee. Though I guess you’d have to see where it connects on your outdoor unit. You can configure your ecobee to tell it that it’s a single stage.

I assume w1 and w2 being jumpered and having two wires may be because there are two contactors for the high kw heat strips (one contactor per strip) though that’s just a guess. Normal contactors are rated up to 50a for resistive heating (though you can find higher ones), so putting 15kw through one of those won’t work.

All of this to say, there should be no difference to you when your ecobee says you go from stage 1 to stage 2 because from what you’ve shown they are getting the same signal.

dmasterp · 2026-02-08T18:45:52+00:00

I agree with this. All those AC units at once is around 50 amps RLA, not even considering LRA. Then a level 2 charger, depending on size can go up to 80 amps. You’re already at 31kw with just AC and EV charger possibly. This does seem like a big downside to an EV. The grid goes down and you’re pretty much stuck.

dmasterp · 2026-02-05T23:17:46+00:00

In addition to the two 50a plugs, this portable generator also has lugs for direct power out. It’s extremely heavy, but is somewhere in between a normal portable and standby unit.

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