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Old 04-14-2009, 05:46 AM   #16
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Taco IFC pump makes noise when it stops


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Originally Posted by Addicted View Post
You are missing the fact that I have a DHW loop in parallel.
No I'm not.

But, I am still waitng for you to post a pic, or drawing of your piping.

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Old 04-14-2009, 06:19 AM   #17
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Taco IFC pump makes noise when it stops


Do you have a single 1 1/4 pipe that can be traced thru one pump from the output of the boiler to the inlet of the boiler? If you do, that is your primary loop. The primary loop is to keep the boiler as near the set operating temperature as possible, period. It is protection for the boiler, against thermal shock only. Secondary loops or system loops or dhw loops or snow-melt loops or any other loops are supposed to be tied to the primary loop to 1. Supply hot water to a given heating circuit and
2. Return the water with the depleted BTU's to the boiler for reheating. Generally several heating circuits or zones can relie on one pump in either the feed or return of a secondary loop to push or pull the heated water around the circuits in the SECONDARY LOOP for those circuits only. If you look carefully you will see that the primary is a complete unbroken loop from the boiler to the boiler. The secondary should also be a complete loop from where it comes off the primary, thru pump(s), zone valve(s), ball valves, flo-cheks, radiators, in floor radiant, sno-melt, etc., all the way back to where it ties into the primary. The DHW is just another secondary, but in this case rather than put an expensive zone valve in the loop people will put either a bigger pump with a chk valve built into it or a pump w/o a chk valve and put in a flo-chek instead. This is so that your sidearm water heater will get hot fast, have faster recovery, and during shut down there is much less chance of the hotter water bleeding off into cooler areas of the system. When your DHW calls for heat, the boiler/primary pump starts up to make sure the boiler gets hot + stays hot. This pump WILL NOT push water around ANY secondary loop whether it be DHW or Heating zones. When the DHW starts up the DHW pump starts up and pushes water around the DHW loop ONLY. If it did not start your winky would get real cold in the shower. The same process happens with the heat zones except that the appropriate zone valve opens first, then the Heat/secondary pump starts up, then the boiler/primary pump starts up, and after a short time delay the ignitor circuit lights off the boiler and you are in business.
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Old 04-14-2009, 06:56 AM   #18
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Taco IFC pump makes noise when it stops


Primary secondary piping doesn't protect boilers from thermal shock.
Thats an old wives tale.

The only way it could protect a boiler from thermal shock is if the primary loop moves more water then all the secondary loops combined.

Primary secondary only guarranties that the primary loop moves the amount of water that the boiler needs.

Check out heatinghelp.com

Its a wethead site.
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Old 04-14-2009, 09:09 AM   #19
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Taco IFC pump makes noise when it stops


sounds like someone got kicked out of bed to early this a.m., but I could be wrong. As far as protect or not on boilers and their primary loops you might be right, but not in this lifetime. All the boiler manufacturers I have dealt with (about 12) have all told me the same thing and I have seen it first hand when someone chooses to disregard their warnings. Replacing boiler sections is NO FUN!
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Old 04-14-2009, 10:42 AM   #20
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Taco IFC pump makes noise when it stops


Boiler manufacturers, have changed their stories more then one time (the reps at least).

Yes, their latest kick for the last 10 to 20 years is P/S piping cures all..

It doesn't.

A lot of 50 year and older boilers around without P/S piping.

I'm up at 4:30 every morning.
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Old 04-14-2009, 12:47 PM   #21
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Taco IFC pump makes noise when it stops


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I'm up at 4:30 every morning.
How do you do that ?
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Old 04-14-2009, 12:59 PM   #22
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Taco IFC pump makes noise when it stops


LOL... 2 alarm clocks.

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