Ultra Flow requirements

Rocky_2

Am installing a 230 Ultra. Will be hooked up to an existing Amtrol hot water maker. Tappings on tank are 3/4". Literature on Amtrol says it wants to see between 4 and 8 gpm flow in the coil. Is this going to be sufficient flow through the Ultra's heat exchaner? With the Amtrol in priority, the P/S system off the boiler will be disabled so boiler pump will not be able to provide any flow through Heat exchanger. Just want to make sure the 4 or 5 gallons a minute going through Amtrol coil will be sufficient to keep me from damaging the 230's exchanger. thanks in advance for all the good info,
Warm regards from chilly Fairbanks,
Rocky

Tony_23

Ultra 230

Requires a 0011 or equivalent for DHW just like it does for space heating. I would pipe it at least 1" right up to the water heater, but 1-1/4" might be in the instructions ?

I have one in a commercial application, on bbd, that required quick recovery from setback. I piped the tap for DHW off my space heat manifold and used a Taco relay with priority. DHW circ and primary circ run on call for DHW and other zone circs are off. I saved a 0011 and used an appropriately sized 007 for the DHW. $100 difference

hr

It's the pressure drop

in the indirect coil that you need to watch. The Weil installation manual has a pressure drop table shows what is comfortable when adding an indirect.

Any way to use a Weil or Triangle Tube tank in tank design indirect? Very little pressure drop in those things, and excellent heat transfer surface. Not nearly the lime up issues as finned coild indirect HXers.

I'm running my small 32 gallon phase 3 with 140 boiler temperatures powered by a Lochinvar Knight. A bit slower recovery, but doesn't require a mother of all pumps, and it sweats nicely throughout the whole show!

hot rod

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Floyd_21

Don't worry about the Ultra....

that sucker will protect it's self even under dry fire conditions. But make sure that you have at least an 0011 on there with large enough piping to get good flow. The Amtrols are rather restrictive with their coils and you need a good amount of head to push enough water through them. the worst case is that the Ultra will short cycle. If worst comes to worst you ccan back the DHW side of the Ultra down a bit, to keep it from short cycling, the recovery may be affected, but not because of the boiler, it's dependent on the amount of water you can jam through that coil.

Floyd

Rocky_2

I have 3/4\" taps off boiler loop feeding Amtrol

Am using a Grundfos 26-64 to pump it. Looks like I might need to re-do the indirect taps to at least 1" right up to the coils and change the pump out to a taco 11. Or, could go get me a Smart 40 tank and be done with it. More piping, more time to tear out a perfectly good Amtrol 41, but this IS going in MY own shop, after all. First one I've put in. Start one for a customer next week in a new house, so am using myself as the guinnea pig here. So far I like what I see, just hope the nuts don't start leaking like I've been reading on a few threads here.
Thanks for the info,
Warm regards from chilly (currently at 18 below zero) Fairbanks.
Rocky

hr

Actually, Rocky

it will probably work the way you have it. You may have some higher than desired velocities in the piping between the boiler and indirect, but it is an intermitent load.

The 26-64 will move the required 14 GPM at 15 feet, how does that look to the spec show in the Weil manual.

You need the coil spec on the indirect also. The 0011 shows an available 10.4 feet (for the indirect) with an 11.5 gpm flow through the boiler. The 26-64 is very close to the 0011 at that point on the curves.


If I, or someone has time they could run the numbers on the HDS software to show that exact install. With piping lengths and fitting count you could pin point that on the HDS.

hot rod

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Bob Schultz_2

How I Did It.

The last time I installed this combination, I wired the primary pump to run constantly, (same terminals as the 110 volt supply).
This allows constant circulation across the heat exchanger, so no matter what happens, the boiler gets flow.
Learned the hard way, because before doing this, the pipes would shake, and huff and puff, and the boiler would overheat.
Works Great Now.

Rocky

Thanks, Hot Rod,

I will run the HDS myself as I have it installed. Didn't even think about that. that's why "You da Man!"
Regards,
Rocky