Thermostatic Controls - T-stat setup

I hope someone can help me with this, I've got a Trane XR80 propane furnace that I
heat a small living space (1100 Sq. Ft.). I've installed a heat exchanger
coil in the furnace duct work to be fed with a waste oil boiler made by
Omni out of Spokane, WA. The boiler is much larger than I need to heat
the space I have right now, (250,000 BTU) I will need the extra BTU's for
a future home located next door to the existing living space. I have the
boiler set up to heat a 110 gallon insulated storage tank (Therma-stor
made by Dari-kool, DEC International), that way the boiler is not doing a
lot of short cycling since the boiler is much larger than I need. I'll
then draw out of the storage tank to supply hot water to the heat
exchanger coil in the furnace duct. I would like to have two t-stats
(which I have already) hooked to the system. I would like to use the
non-programable honeywell t-stat to be hooked up to the furnace (the propane part)
as a back up, in case I run low on waste oil, or the boiler is down for
repair(this t-stat would be set at a lower temp. setting than the
programable t-stat, a honeywell magic stat CT3200, the programable t-stat will be used to draw the hot
water from the Therma-stor tank via the Taco circ pump). I would like to
have the programable t-stat, when it calls for heat, power up the honeywell R8845U universal switching relay, the relay would turn
on the circ. pump circulating the hot water out of the Therma-stor tank to
the coil in the furnace. The furnace coil is located about 30 feet from
the Therma-stor tank, and the hot water is supplied to the coil with 1
inch pex line through a Taco 0010-F3 (the pump is probably larger than I
needed but I will need it for future use, and it came with the boiler). I also have a chronotherm III available, I'm not sure if I can use this t-stat rather than have two t-stats hooked up to my system. I have a five wires that run the system now, green, yellow, white, red, & blue. If I run the system with 2 t-stats (if thats possible) my idea is to use the non programmable t-stat with the existing 5 wires for the propane backup and run a new group of wires to the programmable t-stat.

Now here's my questions, I would like to be able to, when the programmable t-stat calls for heat have the t-stat power up the universal switching relay which will start the circ pump pumping the hot water to the coil in the furnace duct work. Is there a way to delay the start of the furnace fan, other than using an aquastat on the return line from the coil in the duct work. I would like to have it function like the propane furnace function does now, (t-stat calls for heat, starts the flame, after a period of time the fan comes on, t-stat is satisfied, flame turns off, & the fan runs for a cool down time). I would like to have the furnace do these functions, minus it starting the flame, can this be done? I'm open for options other than the ones that I've described. I was told to use a two stage t-stat, but wasn't told how to wire it up.

Thanks,
Ben

I am going to suggest the Honeywell IAQ t-stat.. You can set it up to "lock" out the LP heat with the outdoor sensor, and also if the system is 2˚ below set point, the LP can kick in to help.

Do you have A/C on your system?

No, I don't have A/C. I did get the boiler fired up last night and I think I might just use the Magic stat t-stat rather than have two t-stat hooked to the system. I circulated the water through the coil in the furnace and turned the fan switch on manually on the t-stat. It worked perfect, sending heat into the living space. Can you tell me, is their a way to have the t-stat just turn on the fan in the furnance when it calls for heat?

Thanks,
Ben

If the thermostat has the option for gas/elect heat = YES, if gas only.. NO.
And is it two stage heat?
And yes you can delay the fan with a time delay or sequencer.

No it's not two stage heat, and according to the instruction manual there is a setting on the back of the t-stat for "gas or oil" and "electric". How would I have the t-stat just run the fan when it calls for heat and turn the fan off when the t-stat is satisfied?

Thanks,
Ben

I would use a 2 state thermostat, first stage being pump and fan, second stage being gas heat. As Jay said you can set up the LP not to run above a set outside temp as well as it will kick on automatic if the temp in the house drops 2 degrees below the set point and the outside temp is below the lock out stage.

see this post.. any of these two can do the job.. I prefer the Honeywell myself. With it you would need the outdoor sensor and then set the stat up for two stage heat with the stat controlling backup heat (fossil fuel kit)

http://forum.doityourself.com/thermostatic-controls/381515-digital-thermostat-always-backlight.html

OH and on most stats if you choose elect heat the stat controls the fan.

Switch it over to "Electric", then the fan will come on right away on call for heat.

THANKS for the information so far, other than going out and buying a two stage t-stat that you recomended, can I wire up my t-stat that I already have (Honeywell magic stat CT3200) to perform what I'm looking to accomplish? I'm basically using my Trane XR80 as an air handler, in my original post I wanted to be able to have the LP part of the furnace still functionable through the t-stat. At this point in the heating season if I can just make the fan run when the t-stat calls for heat and turn off when the t-stat is satisfied I will be happy. By the way, I have 5 wires suppling my t-stat now, would that be suffiecient for the 2 stage t-stat that your talking about?

Thanks,
Ben

THANKS for the information so far, other than going out and buying a two stage t-stat that you recomended, can I wire up my t-stat that I already have (Honeywell magic stat CT3200) to perform what I'm looking to accomplish? No it can run the pump and furnace fan or the furnace and fan. It cannot do both pump and fan and then LP backup. At this point in the heating season if I can just make the fan run when the t-stat calls for heat and turn off when the t-stat is satisfied I will be happy.
Wire pump relay to W and leave G wired to G on the furnace, with the Thermostat set up for elect heat, this will run your pump and start your fan.
By the way, I have 5 wires suppling my t-stat now, would that be suffiecient for the 2 stage t-stat that your talking about?

Thanks,
Ben
No unless you do not have AC.... Edit.. You could add a time delay that is adjustable for say 20 mins. when this makes it would fire off the second stage of heat. Both would run until the tstat was satisfied.

you need

R=24v
C=common
G=fan
Y=AC
W=Stage 1 heat (pump)
W2=Stage 2 heat (LP,wires to W on furnace)

Or you can use 5 wires with a non-programmable mercury bulb thermostat. Leaving out the common wire.

THANK YOU, it looks like this will work, now I also know what each wire does as well. I'll reply again as soon as I have everything wired up and let you know how it's working.

Thanks again,
Ben

Jay11J & Cyberdead,

I got my system wired up and running for most of the day yesterday, today will be the first full day of running on it's own. All the information is MUCH APPRECIATED.

Thank you,
Ben

Glad we could help, let us know how this works out for you.. and how did you end up setting it up?

It works great. I moved the switch on the magic stat to the gas setting and had to back out the "B" screw one turn. From a honeywell switching relay I ran a 2 wire t-stat wire to my trane furnace. I connected the red wire to the red wire in the furnace from the magic stat. I removed the white wire (that comes from the magic stat) from the furnace and wire nutted it to the white wire from the switching relay. This switching relay runs the circ pump that pumps the water out of the therma stor tank to the coil in the duct work. I've got an aquastat set up to fire up the boiler when the temp. of the water in the therma stor tank starts to cool off. So far I have the house t-stat set at 72 degrees, the boiler starts every two hours and runs about 15 minutes. If you want I can try to post some photo's of the system.

Thanks again,
Ben