pump question?

RoosterBoy

hay guys on one side of my house i have a baseboard loop with a taco 007 i am installing a new zone 55ft of suntemp basebord on the other side of my house this week and want to use a grundfos 1558 on speed 2

will running the 1558 at a lower speed at the same time as the 007 be Okay. or will i have problems.

will lower speed be better for heating then at speed 3 like a 007 id like to move the other zone to a 1558 also

thank you

RoosterBoy

anyone? :-)please help

Bob Sweet

Rooster Boy

are you running this set up pri/sec ?

RoosterBoy

no im not doing primary secondary looping i thought that was just for radiant floor

sometimes both zones will come on at the same time right now i use hydro air on this side of the house and baseboard on the other now i am installing baseboard to replace the hydro air and just keep the duct for my ac last year i used 2 007 and it worked fine im just not sure if running 2 pumps at different speeds is okay

my setup is a g115 with riello burner lt 160 dhw tank and r2107 buderus outdoor reset

thanks

hr

You need to know

how many btus are needed and the pressure drop to accuratly answer that question. Add up all the baseboard lengths, and the copper piping and fittings and do some calculating. A rule of thumb is not more than 67 to 70 feet of 3/4" baseboard on a zone.

It may be best to add a second zone and circ pump if your lengths are getting out there.

The free Slant Fin calculator, on this site would answer a lot of the questions


hot rod

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Bob Sweet

pri/sec works well

with any set up (rfh, BB, HA ), it allows pumps to work independantly or in tandem regardless of what each pump is doing, along with a bit of boiler protection from return temps. My guess is if the heat load hasn't changed youll be fine.

RoosterBoy

OK i'm not sure how to calculate the pressure drop and gal per min flow. but maybe this will help the whole loop is being piped in pex and will total 138 feet that includes 55ft of baseboard loaded for 170deg on -8 deg day in connecticut

thanks

RoosterBoy

ok i added up the btu in each zone and came up with this
BTU divided by 10,000

zone 1 gave me 2.4gpm flow and zone 2 gave my 2.9gpm flow
not sure how to do pressure drop

i was thinking of piping this zone with a home run setup and still use just one t-stat this way here i wont need a differential pressure bypass valve because all baseboards would run at the same time every time there's a call for heat it's a small part of the house with 2 bedrooms it would be crazy to run t stats in every room :-)

RoosterBoy

thp_8

007

I hate to muddy the waters, but I will. Your first 007 is more than enough circ. for the whole job. If it was mine, I would zone valve the set up and just use the one circ. Always looking to use the least amount of power. Total energy effiiency is often overlooked.

RoosterBoy

thanks thp

zone one has 47 feet of baseboard and is a 120ft loop that includs the 47 ft of basebord

zone 2 will be 55 ft of basebord and i want to do it as a home run so each room gets 170deg

thanks