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[Dirtslinger]

Has any one put there heat exchanger on the cold air return side of forced air furnace?
 If so how well does it work.
Just bought a woodmaster 4400
Thanks

[yoderheating]

 Depends on what kind of furnace you have.  If you have air conditioning you will have to put in a zone valve.

[willieG]

i am not sure what your ductwork is like, but it is recomended that you "fill" your ductwork with rad in order to stop air flow from going around your rad and not through it, most ductwork i have seen has a larger return duct than the other, if so you will need to spend more money on enough rad to fill the bigger cavity, also it is wise to have your rad on the "clean side" of your filters so your rad is not collecting the "dust bunnies" that your filter will normally capture

[Dirtslinger]

Depends on what kind of furnace you have.  If you have air conditioning you will have to put in a zone valve.

My furnace is a arcoaire with no air cond.

[Dirtslinger]

i am not sure what your ductwork is like, but it is recomended that you "fill" your ductwork with rad in order to stop air flow from going around your rad and not through it, most ductwork i have seen has a larger return duct than the other, if so you will need to spend more money on enough rad to fill the bigger cavity, also it is wise to have your rad on the "clean side" of your filters so your rad is not collecting the "dust bunnies" that your filter will normally capture

The only reason for putting it on return side is that my plenum small if I do put it on the cold air side my filter will be in front of it to stop the dust bunnies

[R W Ohio]

I have a coworker that had to install his in the return and has had no problems to date. The hot air across the blower motor was a concern but as of now it has not caused any problems. I will tell you to make sure that the water goes into the bottom of the coil and out the top in order for it to work.

[Dirtslinger]

I have a coworker that had to install his in the return and has had no problems to date. The hot air across the blower motor was a concern but as of now it has not caused any problems. I will tell you to make sure that the water goes into the bottom of the coil and out the top in order for it to work.

I was looking at that to and my circuit board is in there so I might have to change my mind again

[yoda]

I have a coworker that had to install his in the return and has had no problems to date. The hot air across the blower motor was a concern but as of now it has not caused any problems. I will tell you to make sure that the water goes into the bottom of the coil and out the top in order for it to work.

my coil is on the "hot" side but I have my hot water going into the top of the coil. Should I change it around? if so why? thanks

[R W Ohio]

I have been told that it is hard for the pump to push air from the top down through the coil,thus you could end up with an air lock in the coil and not be able to bleed it out.

[yoda]

 Makes sense, thanks

[yoderheating]

 If your pump can't push the air out of the coil your pump is undersized. The suppy should be on the side the air is blowing toward. So, when installing in the return, the suppy sould be on the furnace side, and when installing on the supply side the water supply should be away from the furnace. This will make the air warmer. As the air flows through the coil,  it reaches warmer and warmer water.  If you put the hottest water first, the rest of the coil does very little to raise the air temp.

[jcappe]

Mine is in the cold air section of my duct work and it works great.  I basically put it where the furnace filter was and moved the filter. 

[Acecooper]

My furnace also has air conditioning. I don't know how it works on yours but mine us working properly. It is hard to give a suggestion since you haven't supplied a complete description to what you are using, try to post a picture so we can visualize it.

[juddspaintballs]

The system I am currently installing via the help of my HVAC father-in-law has the AC coil on the supply side inside of the air handler, then the water/air HX in the plenum, and the backup electric heat coils on the return side. 

[yoderheating]

 The reason you have to be careful with a furnace with A/C is because you do not want to pull hot air across a A/C coil when the A/C is running. This has the potential of damaging your compressor. This may sound like a strange scenario but it has happened.