Hi,

I have a used furnace with a 5 ton evaporative coil on it. I want to connect it to a 3.5 ton compressor. Any potential problems? Seems like it would be slightly more efficient.

llama

There are many potential problems but they can be overcome with the proper parts and a professional service person in the HVAC trade.

The unit will need a expansion valve installed on the coil. The TXV should be externally equalized and adjustable. It would also be good if it has a built in pressure balance circuit so additional start components will be kept to a minimum.

Once in operation then the TXV will need to be adjusted to the correct super heat setting. The pressures will be a bit different that a matched evaporator but the larger coil surface of the bigger coil will allow more moisture removal and slower blower motor speed if desired.

HVAC 1000,

Thanks for your input.


There are many ....... speed if desired.