I'm supposed to wire up two furnaces that share a common return duct that then branch off to separate supply ducts. They are twinnable but weren't twinned when I got here. Should the fans be interlocked so if one turns on it doesn't suck air through the others supply?
Whoever wired them the first time was a complete hack so I don't trust anything. I see there's a 24V EAC running off R and C along with a 24V humidifier solenoid, programmable stat, and the AC contactor running off the boards 40VA transformer. There's some other shoddy looking stuff but I'm refeeding them so I can pull new feeds so they're on the same phase if they need to be twinned.
Building has a total of four furnaces with two sets of furnaces sharing a return but all are ducted to their own supplies. The AC condensors are all different sizes but the CFM jumpers are also set to max for cooling so they should all be moving similar CFM when the AC turns on.
Whoever wired them the first time was a complete hack so I don't trust anything. I see there's a 24V EAC running off R and C along with a 24V humidifier solenoid, programmable stat, and the AC contactor running off the boards 40VA transformer. There's some other shoddy looking stuff but I'm refeeding them so I can pull new feeds so they're on the same phase if they need to be twinned.
Building has a total of four furnaces with two sets of furnaces sharing a return but all are ducted to their own supplies. The AC condensors are all different sizes but the CFM jumpers are also set to max for cooling so they should all be moving similar CFM when the AC turns on.
source https://hvac-talk.com/vbb/threads/2229602-Shared-Return-Separate-Supplies?goto=newpost
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