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[POPS60]

search for it and could find the answer.

I just finished insulating my work shop 30x50 insulated 2x4 walls and ceiling which is 11'6".  I'm mounting a 200K (bigger is better) modine type fan coil 2 speed hanging from the ceiling location is higher than my boiler.  It's a 50ft run to my boiler.  Should include a flowcheck to keep the water from draining back?   Looking to put a Grundfos UPS26-99FC 3 speed to feed it on a thermostat 40-45 when not occupied, and take it up to 60-65 when in there couple times a week.  Any ideas input is welcomed and appreciated


Live in Northern WI.  boiler run at 185, 1in pex

[mlappin]

You don’t have to, but a 26-99 can be bought with a flow check already in it.

I used three smaller air handlers in my shop, two of the three are plumbed by running the lines up to the stringers, then dow not the heat exchangers and back up, don’t have flow checks in any of my pumps and have had zero issues so far.

[RSI]

It probably wouldn't hurt to leave the flow check in as long as the pump is at the stove. If you ever get a small leak in the lines it should keep the supply side full of water at least.

Adding a bleeder valve after the pump may not be a bad idea in case you ever get air trapped in the pump.

[E Yoder]

I normally remove the flow checks unless I actually need them to prevent reverse flow to gain a bit more flow. I would doubt you'd need a big 26-99 except for the initial purge of air on a 50' loop.  I've been using some NRF-25 B&G's and have been impressed with the flow it can put out. A lot for the money.
Anyway, it'll work with or without the flow check. Won't drain back unless you have a leak.

[schoppy]

FYI, I ran GPM flow tests on several different brands of pumps including 2 different brands of ECM pumps (RSI supply me one of them) and there was no measureable difference in flow with or without the check valves in place. I checked this twice as it didn't seem right to me.

[RSI]

I can't remember if you told me before, how close were the GPM displays on the ECM pumps to what you measured?

[schoppy]

I don't know if I wrote that down, but if I remember correctly the measured flow was a little less than the displayed flow. I will have to check to see if I wrote that down.