Dual Boiler Hookup: Controls

 
TGMC
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Post by TGMC » Tue. Aug. 19, 2008 8:55 pm

the argo 6 zone controll will also interface with a reset controll for outside temp, I think the taco is an argo in taco clothing.


 
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Post by TGMC » Tue. Aug. 19, 2008 9:03 pm

actually this config. works with both series or paralell/primary-secondary. my system is a dual paralell with secondary supply pumps on the push. I use only 1 pump on the coal boiler for the primary loop because the bioler is at the opposite end of the house. if the gas turns on, it turns off the call for the coal, canceling the pump, the secondary pumps take over as primary when the gas is on.

 
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Post by Scottscoaled » Tue. Aug. 19, 2008 10:34 pm

How do you heat your dhw? :) Scott

 
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beatle78
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Post by beatle78 » Wed. Aug. 20, 2008 8:23 am

stokerscot wrote:How do you heat your dhw? :) Scott
Scott,

Was this question for me or TGMC? I heat my water with an indirect HW heater.

 
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Post by beatle78 » Wed. Aug. 20, 2008 8:26 am

TGMC wrote:the argo 6 zone controll will also interface with a reset controll for outside temp, I think the taco is an argo in taco clothing.
ahhh. good to know! I think the Argo one is better b/c the Taco 6 zone doesn't mention anything about priority safety timer. On the Taco 6 zone, the priority zone could disable all the other heating zones indefinitely. :!:

 
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beatle78
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Post by beatle78 » Wed. Aug. 20, 2008 8:28 am

TGMC wrote:the c1/c2 on the gas boiler calls the t t on the coal boiler. the gas valve is 24 volt. if you use 2 honeywell 8124a controllsuse 1 more cube relay on the c1/c2 output of the oil boiler.the oil boiler is actually called first but is the secondary boiler in this configuration.
This sounds interesting...

Could you draw this out? I don't quite visualize this.

 
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Post by Adamiscold » Wed. Aug. 20, 2008 9:06 am

beatle78 wrote:
TGMC wrote:the argo 6 zone controll will also interface with a reset controll for outside temp, I think the taco is an argo in taco clothing.
ahhh. good to know! I think the Argo one is better b/c the Taco 6 zone doesn't mention anything about priority safety timer. On the Taco 6 zone, the priority zone could disable all the other heating zones indefinitely. :!:
I know my Azel i-Link series multi-zone controller doesn't have a priority setting on it but it's not needed on my system, the draw of the DHW greatly out weights the volume of water that my pumps use for each zone. So the DHW will always get first priority for the hot water.


 
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beatle78
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Post by beatle78 » Wed. Aug. 20, 2008 2:54 pm

I like the looks of this Honeywell Outdoor Reset(ODR) AQ475 [see attached). I would run the T-T from the zone relay to the R-W on this outdoor reset and then from the "Boiler Aquastat" on the ODR to the T-T on the L8124 on the coal boiler.

The nice thing about using this is that I can control the coal boiler's circ. pump with the C1-C2 on this ODR. This is important b/c I need to the circ pump on the coal boiler to run when there is a call for heat since it is the pump for the coal boiler is the "primary loop" pump.

AND I can get it for $150!!! :D

Attachments

honeywell_aq475amanual_OutdoorReset.pdf
.PDF | 599.8KB | honeywell_aq475amanual_OutdoorReset.pdf

 
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Post by TGMC » Wed. Aug. 20, 2008 5:34 pm

MY DHW is heated by 2 indirect waterheaters, 1 40 gal weil-mclain, 1 ford 60 gal for solar with a concrete jacket. I chose the argo controll because the priority zone cancels out after about 15/20 min.plus it is expandable with more zone controlls and the odr controll. my piping is set up for 8+ zones and a future solar loop.

 
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Post by TGMC » Wed. Aug. 20, 2008 5:36 pm

i'll do my best to draw this out. i'm not good on paper, but can put this stuff together in my sleep all night long.

 
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Post by beatle78 » Wed. Aug. 20, 2008 8:12 pm

TGMC wrote:i chose the argo controll because the priority zone cancels out after about 15/20 min.plus it is expandable with more zone controlls and the odr controll. my piping is set up for 8+ zones and a future solar loop.
Good point, The Taco control is almost identical to the Argo EXCEPT it makes no mention of the priority zone shutting down after 'x' amount of time.

I'm not sure if I'm going to use the priority zone feature, but it would be nice to have available if I so choose to.

I don't think I can use the Argo ODR b/c I need a ODR that will turn on the system pump when there is a call for heat. The Honeywell has a C1/C2 connection so it can turn on the system pump when there is a call for heat.

 
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beatle78
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Post by beatle78 » Fri. Aug. 22, 2008 8:46 am

Update:

Here is what I plan to do for the top level controls.

1. Zone controller -> Outdoor Reset -> Coal Boiler's L8124 Aquastat

2. Zone controller -> Oil Boiler's L8124 Aquastat

Now, I don't think I can run the T-T from the zone controller to both the oil and coal appliances b/c each aquastat supplies 24VAC to the dry contact T-T on the zone controller. If I did that and a service man shut off the power to the oil boiler, the 24VAC from the coal boiler would backfeed the oil boiler's L8124 and kill the man!

If I'm wrong on this please let me know!

So what I plan to do is have a DPDT manual switch to switch from the coal boiler to the oil boiler! Now, I also plan to have a single thermostat in the house connected to the T-T on the oil boiler's control so if we go away and the coal boiler goes out and the house starts to get cold, the oil boiler will get a call for heat from that single thermostat and provide heat to the heating zones.

I will follow up with how I plan to setup the coal boiler controls....high limits shutoff, fire out shutoff, outdoor reset.....

 
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Razzler
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Post by Razzler » Fri. Aug. 22, 2008 5:02 pm

If you are installing a L6006A aquastat to stop the coal from feeding if you have a out fire? You would be useing terminal R and W(braek on temp drop)You can use the terminal R and B(make on temp drop) to powerup the backup gas boiler.

 
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beatle78
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Post by beatle78 » Mon. Aug. 25, 2008 9:22 am

Razzler wrote:If you are installing a L6006A aquastat to stop the coal from feeding if you have a out fire? You would be useing terminal R and W(braek on temp drop)You can use the terminal R and B(make on temp drop) to powerup the backup gas boiler.
I like this idea! I would put the L6006A before the power switch to the coal boiler. This way the power from the L6006A will either go to the switch for the coal or the switch for the oil.....

The only issue I see is when I need to start the coal boiler. I will need to bypass the L6006A with a SPDT switch to power the coal boiler when it is cold.

If I forget to flip this switch back it will not allow the oil burner to come on at all until I flip the SPDT and it routes power back to the L6006A..... is this is problem? perhaps?.....hmmmm

 
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Razzler
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Post by Razzler » Mon. Aug. 25, 2008 3:26 pm

not a problem! Just DON'T forget to turn switch back on!! :lol: The only time you would need to over ride with the switch is when you are starting the fire again..


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