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[CRJR]

I fired up my boiler tonight the supply and return lines in the house going into the water to air heat exchanger are both hot enough I can't hold on to them for more than a couple of seconds but the temperature coming out of the register is only lukewarm air any thoughts?

[slimjim]

Perhaps the rad is getting dirty with dust? how hot is the water line on the outbound or return side of the heat exchanger while the fan is on?

[CRJR]

Return line feels the same as the supply. If I turn the propane back on and turn the furnace on I get warm air. The plentum is cold when trying to use hot water from
owb for heat.

[slimjim]

Sounds to me like the Rad, on the air side, is plugged up and the air can't pass through the rad, pull it out and clean it.

[CRJR]

I follow what you are saying but I have good air flow and I get good heat when using the propane. I'll see if I can open up the plentum and make sure the hx isn't full of dust

[slimjim]

Try closing down a ball valve on the loop about 2/3 of the way closed, you should be able to hear the water rushing past the valve, if so then I would bet there is a coating of dust inside the fins on your rad and that dust slows the ability of the rad to transfer the heat, pet hair can be a real issue, I would clean it then add a filter.

[CRJR]

water to air hx in plentum  looks as clean as when I put it in 2 years ago

[CRJR]

I had  a/c installed this summer. For some reason the a/c compressor is turning on and cooling the air in the plentum

[mlappin]

It's been years since I've wired mine up, but you definitely have a wiring problem. For now just turn the power off to the AC.

Somebody that deals wit this daily will be sure to chime in shortly.

[slimjim]

There you have it, RSI does a lot of 24 volt controls, I'm going to sit back and let him handle this one