Recent content by cagey

For closure: I did this, switched from voice call to email due to a long wait queue, and over a number of days and one back-and-forth, was assured that my proposed lineset routing would result in a reliable and fully performing system. As an aside, this r/DIYHeatPumps...

Thanks for your reply. From the installation manual, for all capacities of the MRCOOL Universal System, the refrigerant line diameters are 3/4 in. (Vapor), 3/8 in. (Liquid). Cross referencing with the "Determine Refrigerant Velocity" chart you provided, it predicts vapor velocity 2500 fpm (3...

I'm evaluating ideas for replacing the two 23 year old 4 ton 12 SEER R22 package heat pumps sitting on my roof. They're still working okay, but will need to be replaced eventually. When that happens, I would rather not replace them with rooftop package units (mainly because of maintenance...

I believe my ducting precludes: I'm pretty sure the duct that's closer the the camera (flowing from the house into the package unit) mounts right where the economizer would be installed (with house ducting connecting to the bottom of the package). Agreed. Also it's not that much of a hassle...

Also relevant for my (single-speed R22) compressor: https://www.copeland.com/documents/ae-1312-application-guidelines-for-1-5-to-6-75-ton-refrigerant-r-22-407c-134a-copeland-scroll-compressors-en-us-1570846.pdf From pg 3: I'm pretty sure a package unit such as mine would always have a...

To gain a little closure on the compressor crankcase heater (CCH) sub-topic: from this 2008 hvac-talk topic: and (from a different poster on page 2 of the topic): As with most forum topics, opinions will vary, and that's certainly true of the above-referenced hvac-talk topic, but as far as I'm...

Fascinating! In case anyone who can discern the telltale signs of such a lashup is interested taking a look, the best online-accessible wiring diagram I can find for my specific heat pump is on page 38 of this document.

That's an interesting subtopic in its own right: I did some investigation in past months regarding why a 1-pole contactor would (aside from it's presumed lower cost) ever be preferable to a 2-pole in this application, and the best I could come up with was that it's needed to power a compressor's...

Agreed. The two relays I've already replaced were replaced from spares I'd put in inventory. Spare fan motors I don't have yet (due to cost and only recently pinning down their exact part numbers), but I have spare contactors, a 90-370 relay, a sequencer relay, and a couple of the caps (I'm...

I've recently (9 months ago) purchased a home with two 24 year old 14 SEER Ruud RJMA 4-Ton R22 package heat pumps running on 240VAC on the roof. Even though they lack state of the art efficiency, thus far (thru most of a winter and most of a summer) they seem to be performing well. As a...

Ditto. I rewired 26 4-foot 2-tube magnetic-ballast fixtures in my new-to-me garage 6 months ago and installed Type-B (ballast-less) T8 LED bulbs. No problems thus far. I'm sure some bulbs will fail eventually, but ... In general, I avoid fixtures with integral LED bulbs.

I was a satisfied EGO customer, having bought 2 smaller tool kits (blower and string trimmer each with 2.5Ah battery and charger) circa August 2021, which have performed admirably. Then one month ago, having a need to clear some trees on a new property, I wanted a cordless 16" chainsaw, and lo...