Quote:
Originally Posted by ChrisFSB
EMS : Has a low voltage relay; Normally Open. When it wants to shed the middle AC; the relay closes.
Dometic : Has two yellow wires, marked "Load Shed". 1 second before the compressor turns on, 12 volts is applied to one wire. If you wire these through the EMS relay, and the relay is closed (i.e. load needs to be shed), then 12 volts is now present on the other yellow wire. The controller senses the 12 volts and this causes the AC to shut down.
I've reviewed the Furrion docs and don't see a similar feature. I guess you could wire the EMS's relay to a 120V AC 20 Amp relay and just cut the AC's power?
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Chris, thanks again for your detailed explanation on the EMS/PCS system and shedding the Middle AC. I would have never done it if you didn't point out those wires and the way the system works.
Like you mentioned on my Furrion using the Furrion controller it doesn't have those two yellow wires. But there is a simple way to shed power to the Furrion by using those two brown wires from the PCS system. I used 12 VDC from the fuse block next to the AC fuse panel and did this to a
normally closed 12 VDC relay:
+12 VDC to one brown wire
The other brown wire to the +terminal of the 12VDC relay
A ground wire from the 12 VDC block to the - terminal of the 12 VDC relay
The other two terminals of the relay are both for the ground wire of the thermostat, so when the shedding is needed, the PCS relay closes, sending 12 VDC to the new added relay which opens it's contacts and opens the ground to the thermostat which turns off the Furrion.
Actually very simple to do for anyone using the Furrion controller and wants to have their PCS system shed if needed.
Linear Mode
