Do I need a pump?

Do I need a pump?

PostBy: franksnbeans On: Mon Mar 31, 2014 5:47 pm

I just finished installing an AA 130 coal boiler. It is all working great except that I'm sending the water about 100 feet to the oil furnace then to the house load. I have a pump which goes from the boiler to the house (oil furnace) but not one back. I lose 4 degrees from coal boiler through pump to oil furnace. On the return I am losing 20 degrees from house to coal boiler with no pump. There is a chance the temp gauge isn't working right on return line at coal boiler. The gauge was left over from old system. I figured if water is leaving coal boiler it has to enter back at same rate. Do I need another pump to return to coal boiler?
franksnbeans
 
Stoker Coal Boiler: AA 130
Coal Size/Type: Pea

Re: Do I need a pump?

PostBy: lsayre On: Mon Mar 31, 2014 8:30 pm

20 degrees of drop in temperature after traversing the homes zones is considered the ideal. Consider yourself lucky.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Anthracite Pea
Other Heating: Resistance Boiler (It has been fixed!)

Re: Do I need a pump?

PostBy: whistlenut On: Mon Mar 31, 2014 8:42 pm

Are you circulating 24/7 with the circ pump between the boilers? Your drop is normal, but we need more info. A series connection (hot from coal boiler to return on oil boiler?) 100' is nothing, but tell us more, and what circ are you using, and the pipe type and diameter to the oil boiler. If the question is related to using the same pump as the oil boiler, then yes, you need a dedicated pump between the two heat sources, and I'd get a 3 speed unit like the Taco 0015(old model was the 008R) or whatever pump curve you need.
whistlenut
 
Stoker Coal Boiler: AA130's,260's, AHS130&260's,EFM900,GJ&VanWert
Hand Fed Coal Boiler: Franks Boiler,Itasca415,NYer130,Van Wert
Hot Air Coal Stoker Furnace: Yellow Flame
Hot Air Coal Stoker Stove: Alaska-4,Keystoker-2,
Hand Fed Coal Stove: Alaska,Gibraltor,Keystone,Vc Vigilant 2
Hand Fed Coal Furnace: Van Wert, NYer's, Ford,Jensen.
Coal Size/Type: Rice,Buck,Pea,Nut&Stove
Other Heating: Oil HWBB


Re: Do I need a pump?

PostBy: franksnbeans On: Mon Mar 31, 2014 8:54 pm

The 20 degree drop is from the house after the zones back to the coal boiler. The drop is just in the tubing. Which is 1" pex. It runs right with the other tubing supplying the house. Which only had a 4 degree drop. I personally think the temperature gauge is off at the coal boiler. I looped a zone at the coal boiler and the gauge stayed the same. I was just worried I want getting a good flow back to coal boiler through the tubing from house. The pump is a taco 1/8 HP
franksnbeans
 
Stoker Coal Boiler: AA 130
Coal Size/Type: Pea

Re: Do I need a pump?

PostBy: Sting On: Mon Mar 31, 2014 9:11 pm

Maybe you need a circulator

Maybe you need better insulation on your infrastructure

It Depends!

Kind Regards
Sting
Sting
 
Other Heating: BurnHAM=NG-gas

Re: Do I need a pump?

PostBy: waldo lemieux On: Tue Apr 01, 2014 8:19 am

Beansandfranks,

If the 20 deg drop is an real number forget the new pump and start dinging. To be sure you could use one of those Infared guns or get two new thermostats. If the drop is real then getting a bigger faster pump is only gonna put more heat in the ground, shure youl have warmer return water but at what cost?

Waldo
waldo lemieux
 
Stove/Furnace Make: efm
Stove/Furnace Model: s-20

Re: Do I need a pump?

PostBy: Rob R. On: Tue Apr 01, 2014 8:32 am

Is this 20 degree drop when there are zones in the house calling for heat?
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: Do I need a pump?

PostBy: franksnbeans On: Tue Apr 01, 2014 10:17 am

No just the tubing returning from house to coal boiler. I am insulating some piping to see if that's where I'm losing it.
franksnbeans
 
Stoker Coal Boiler: AA 130
Coal Size/Type: Pea

Re: Do I need a pump?

PostBy: katman On: Wed Apr 02, 2014 8:07 am

Doesn't make sense if your tubing is contained and insulated underground to lose 4 one way and 20 the other. Are those measurements at the points of entry/exit from underground?
katman
 
Hot Air Coal Stoker Stove: Harman Magnum
Other Heating: Harman PB 105 Pellet Boiler

Re: Do I need a pump?

PostBy: franksnbeans On: Wed Apr 02, 2014 8:24 am

I agree. And your right. I have a zone in the out building which is radiant floor heating. I eliminated that zone by turning off the valves and the temp went right up. I try to make this understandable....even with the control valve closed on the feed to the radiant, the return must have been feeding through one loop in the floor and back through the other. Giving me a ghost flow. Either way I don't need that zone anymore since the axeman Anderson heats the building. So now I have my 4 degree drop back top the coal boiler. Thanks to all who have advice. The forum is a wealth of info.
franksnbeans
 
Stoker Coal Boiler: AA 130
Coal Size/Type: Pea