I don't have a lot of choice. The picture I posted is all I have access to. I'll do it on the left side as close as I can to where it heads into the ceiling. If this doesn't work I am SOL anyways.
EUREKA! This beautiful little tab called "EAC" is an Electrical Air Cleaner, and I don't have one. I read the installation manual where it describes the operation of the furnace in detail. EAC is always on when the fan is on, 120V!
One last question. When I plug everything in, can I just pull the breaker for the furnace (as long as it's not running when I do it, and cause ventilation issues)?
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I got the fan in, but the wiring is still in progress. Romex really isn't suited to hooking up to the control board. It's way too stiff.
I'm trying to stick with the wiring specs already inside the furnace, but that wire is really hard to find in small quantities. In the manual is says all wire inside the furnace must be rated to 105 C / 221 F, which excludes regular THHN wire. It's UL1015 PVC coated stranded stuff. Everything on the control board is between 18 and 14awg. The blower fan itself is on 18awg UL1275, but that is practically impossible to find, as far as I have seen.
What kind of fuse do I need?
I'm trying to stick with the wiring specs already inside the furnace, but that wire is really hard to find in small quantities. In the manual is says all wire inside the furnace must be rated to 105 C / 221 F, which excludes regular THHN wire. It's UL1015 PVC coated stranded stuff. Everything on the control board is between 18 and 14awg. The blower fan itself is on 18awg UL1275, but that is practically impossible to find, as far as I have seen.
What kind of fuse do I need?
Net,
what is the total Flow and Return resistance of the 18awg cable you are thinking of using?
Now apply that 0.4Aac to determine the voltage drop in the Flow and Return wiring.
Express that voltage drop as a % of the whole 115Vac supply.
Your regulations probably state that the % lost in the cable is limited to no more than 5% (This is just a guess).
If your extra leg gives <2%, go ahead. If <1% then even better.
But do watch your cable runs. Keep them cool.
what is the total Flow and Return resistance of the 18awg cable you are thinking of using?
Now apply that 0.4Aac to determine the voltage drop in the Flow and Return wiring.
Express that voltage drop as a % of the whole 115Vac supply.
Your regulations probably state that the % lost in the cable is limited to no more than 5% (This is just a guess).
If your extra leg gives <2%, go ahead. If <1% then even better.
But do watch your cable runs. Keep them cool.
All set up. I'll be observing everything over the next few days, but it appears to be working perfectly. I ended up putting a box in the ceiling with a switch. THHN runs from the furnace control board in flexible conduit, to that switch box, into Romex which runs through the ceiling to the fan.
Thanks all for the help.
Thanks all for the help.
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