I currently have an old GE furnace in my attic. I just had to replace the blower motor as the bearings seized up. I did this without any problem. However, the replacement motor has two speed available. I was told the high speed worked best for cooling and the low speed worked best for heating.
I have a 90-340 control relay in the system.
So, I have several questions:
1st: Will running the fan on low be a good way to go when heating. I would assume yes as my blower cycles a lot when when heating. Seems to me I would get less motor electrical spike with less cycles and less heat would be wasted while the blower wasn't running. Right now it seems like my attic heats up faster than any other location because of the waste heat emanating from the unit while the blower isn't running.
2nd: Assuming that running the blower on low IS a good idea for heating - Can I replace my current relay with a similar relay which would turn the blower on low when heating was being used and on high for when the cooling system was being used.
3rd: Assuming 2 is a yes - Can anyone suggest such a relay?
4th: Assuming 3 is a yes - Can someone provide either instructions or reference to a site with instructions to connect said relay?
Thank you for any suggestions/answers. I have been searching the web for over an hour without an answer.