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Old 08-05-2010, 03:54 PM   #1
Senior Member
Workhorse Chassis Owner
Join Date: Mar 2007
Posts: 320
EMS system and Dometic A/C

I finally figured out that with the EMS I can wire it so when 30amps is approaced, the EMS can drop JUST the A/C compresspr and leave the fans running. Currently the system drops the entire A/C compressor and fans. Rexhall wired the 120 through the EMS instead of the thermostat wire for the compressor activation. Question is Does anyone know which wire on a Dometic digital Comfort Control Center is the one to control the compressor. The Dometic system uses 4 onductor phone RJ-11 wiring to control the A/C from the thermostat. One of the four would need to be cut and routed through the DC relay in the EMS. That much I know from EMS manual.

Dometic doesn't know which wire controls the compressor in the four wire circuit. I figure it's not the red or black wire and can't tell from the Dometic manuals. Does anyone have a coach in which the EMS only drops out the coach A/C on overload, If so please let me know coach mfg. and model and I'll research further

2005 30' Rexhall Vision, W-22 chassis, 19.5 tires, 208'' factory WB, 6000 CCC
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Old 08-05-2010, 04:39 PM   #2
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Mutha's Avatar
Texas Boomers Club
Workhorse Chassis Owner
Join Date: Aug 2006
Location: McKinney, Texas
Posts: 518
The two yellow wires coming out of the control box are the load shed wires. I think the compressor will NOT RUN when the two wires are connected together.
The two Blue wires are the furnace control wires and the Red & Black wires supply 12 volts to the control board. I have the wiring diagram if you need it. You can PM me and I will email it to you.

Good luck

2004 Safari 31SBD TREK W-20
McKinney, Texas
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Old 08-08-2010, 08:30 PM   #3
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I don't beleive that the four wire cable is dedicated to just the AC. It also controls the furnace and possibly multiple AC units if you have them. The thermostat "talks" to the contol unit in the AC to perform different control functions.
Dennis Codella
2007 HR Endeavor 40PDQ
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