Print

[RSI]

I contacted another dealer who said 1" Logstar should work on my 350' run. Anyone have a link to an online calculator to look at the 3/4 (Thermopex) 1" (Logstar) and 1 1/4 (Logstor) calculations?

According to my math w/o just use of a calcualtor, at 350' and assuming 20 DT and a 100,000 BTU furnace (furnace is 100,000, HX is est 200,000 BTU). I used 100,000 in calculation.

1" Logstor  (using 1" pex table)= 43.89 head?
1 1/4 Logstor (Using 1 1/4 pex table)= 15.63 head?

What GPM are you using for these numbers? If you figure just the 350' of pipe at 10 GPM the 1" Logstor would be about 34.5' of head and 1-1/4" Logstor would be 11.75' of head. (logstor 1-1/4" is not anything close in size to standard 1-1/4" pex)

[Gunpowder]

I used 10 GPM
1"
KxCxLx(F 1.75)
.00223 x 1.0 x 350 x 56.234 = 43.89

1 1/4

.000794 x 1 x 350 x 56.234 = 15.63

Obviously Logstor is metric but close enough.

Taco VR1618 specs:

 operating modes:
- Fixed speed (     ) - infinitely adjustable min/max settings
- Constant pressure (   ), variable speed - 3 constant pressure differential curves (5, 10, or 15 feet of head)
- Proportional pressure (   ), variable speed - 3 variable pressure differential curves (High, Med, or Low
    Maximum Shut-off Head: 18 feet 
  •     Maximum Flow: 16 gpm
  •     Maximum Operating Pressure:
125 psi 
(8.6 bar)
  •     Maximum Water Temp: 230°F (110°C)
  •     Minimum Water Temp: 36°F (2°C)
  •     Electrical specifications:
Voltage: 120V, 60 Hz 
Single phase
Operating Power: 4W - 44W
Max. AMP Rating: 0.54
  •    Equipped with a cast iron casing     
and should be used for closed
loop systems only
  •     Taco circulator pumps are   
for indoor use only
  •     Acceptable for use with water or     
maximum of 50% water/glycol solution

[mlappin]

Even with 11 feet of head, the Viridian won’t move 10gpm, least not according to the chart.

http://www.taco-hvac.com/uploads/FileLibrary/102-499.pdf

A Grundfos 26-99 on Med will though.

http://s3.supplyhouse.com/manuals/1297872762860/47830_PROD_FILE.pdf

[Gunpowder]

Even with 11 feet of head, the Viridian won’t move 10gpm, least not according to the chart.

http://www.taco-hvac.com/uploads/FileLibrary/102-499.pdf

A Grundfos 26-99 on Med will though.

http://s3.supplyhouse.com/manuals/1297872762860/47830_PROD_FILE.pdf

Yep. Is my math still right? Approx 44 head with 1" pex? Not sure the numbers to use for 1" Logstor though. I used basic 1" pex numbers off a chart.

At $6,300 for 1 1/4 Logstor or $4,865 for 1" logstor, that's a might big sandwich to eat. I can put a high efficiency furnace in for less than that. Total cost one could put in a Geo system. The CL6048 is already set up on the 50KBTU other building. that is way overkill boiler for that demand on its own. Grrr

[mlappin]

Even with 11 feet of head, the Viridian won’t move 10gpm, least not according to the chart.

http://www.taco-hvac.com/uploads/FileLibrary/102-499.pdf

A Grundfos 26-99 on Med will though.

http://s3.supplyhouse.com/manuals/1297872762860/47830_PROD_FILE.pdf

Yep. Is my math still right? Approx 44 head with 1" pex? Not sure the numbers to use for 1" Logstor though. I used basic 1" pex numbers off a chart.

At $6,300 for 1 1/4 Logstor or $4,865 for 1" logstor, that's a might big sandwich to eat. I can put a high efficiency furnace in for less than that. Total cost one could put in a Geo system. The CL6048 is already set up on the 50KBTU other building. that is way overkill boiler for that demand on its own. Grrr

Im sure Logstor has its own numbers to use, use the numbers for copper and you’ll be close enough for guvmint work.

Other pipes are available, I like Logstor, but you could get 1 1/4” Performaflex Ultra from Z supply for roughly two bucks a foot less than 1” Logstor. Could always have one pump pushing to the house then another pump pushing back to the stove.

[Gunpowder]

I want to stay with dense foam like Logstor/thermopex/Reheau for the obvious benefits.

[aarmga]

I was just contemplating with 44 head feet that pump is going to be working pretty hard.  I'd go with the 1-1/4" for sure.  But at that price plus install plus the stove why not go with a geo system?  Can be done for under 20 Grand now and rebates available.  Plus you don't have to worry about cutting wood or replacing your furnace.

[Gunpowder]

To put closure on this thread. I successfully raised my a-coil 6" so I have room for a HX. Assuming I get approval from the board tonight (monthly board meeting for the nonprofit), I plan to install 1.26” (32mm I.D.) Logstore which is about same I.D. size as the 1 1/4 thermapox. Head should be under 17 so a Grundfos 26-99FC will work.

[slimjim]

Best of luck at your meeting!

[Gunpowder]

Best of luck at your meeting!

The CB 6048 is already installed and 75' of Thermapex ran to the office/nature center. The run in question is to my residence so I am the mercy of the board as I pay my own utilities. Looks like a little over $5K will install the pex and HX plus plumbing. That's a big chunk for a nonprofit these days.