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Adding a fan relay
To whom it may reach..
I added AC to a manufactured home (modular) furnace. The type where you slide the Mortex Coil in the bottom housing of furnace.(Downflow).
My question is, and its probably a dumb one but here it goes.. I need to add a fan relay to kick the fan on when calling for cool. What type of fan relay will I need to install? Again probably a no brainer, but I just opened my doors back in April and Ive been so soo busy and too much on my mind to remember something so simple.. Thanks in advance and I hope this is the correct area to post this thread!
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Originally Posted by
Stoutac
To whom it may reach..
I added AC to a manufactured home (modular) furnace. The type where you slide the Mortex Coil in the bottom housing of furnace.(Downflow).
My question is, and its probably a dumb one but here it goes.. I need to add a fan relay to kick the fan on when calling for cool. What type of fan relay will I need to install? Again probably a no brainer, but I just opened my doors back in April and Ive been so soo busy and too much on my mind to remember something so simple.. Thanks in advance and I hope this is the correct area to post this thread!
Your profile says Owner / Tech so why an electric 101 question?
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use something like a 90-340 relay, It is good for 6.9 amps.that is a generic relay number, made by several manufacturers.
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Does it not already have a fan relay for a g call? I would just let my thermostat call for g and make shure its the correct speed.
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Unless we change direction we are likely to end up where we are going.
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Rib u1c
Use y to energize coil, pass line power through n.o. Contact
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Use G for the coil
Take L1 from blower relay on board and land on C. Take NO on relay and wire to AC speed for blower.
Take heat speed and put on NC on other contact on the relay. Make a jumper from heat speed tap on board and put on C on other relay.
That way if someone has fan on and they turn the heat on, both heat speed and ac speed cant both be energized which will smoke the motor
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Originally Posted by
pecmsg
Your profile says Owner / Tech so why an electric 101 question?
Right! Soon as I got to looking at the wiring I knew exactly which relay to use and how to wire it.. 
Single Pull Normally Open (SPNC) 
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This puppy old. it's equipped with thermal disc type switches that turns on the only speed the motor has which was 1200 CFM.
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