Dometic AES Service Manual (2134KB) - Bryant RV Services

(70) TAG LINE ENERGIZEDSecondly, suppose a customer has a properlywired RM3801 in a motor home that isequipped with a fully functional alternator.After the ignition key is turned on, the printedcircuit board determines that at least 13.3 voltsis available at the terminal block, so the 12volt heating element engages.VOLTAGE ---) 13.3 V.D.C.(FOR 40 SEC. MIN.)12V ELEMENTENERGIZES(71)When the customer leaves on the trip it is ahot, muggy night so the vehicle’s headlamps aswell as the dash air conditioning system isturned on. After a few minutes of driving itbegins to rain, so the windshield wipers arealso turned on. With all of these componentsoperating in the coach, the alternator hasdifficulty keeping up with the demand of thetotal coach load and the house battery beginsto drain. As soon as the printed circuit boardsees that the battery voltage going to therefrigerator has dropped to approximatelyvolts, the electronic circuitry will shut off the12 volt DC heating element to protect thehouse battery, At this time, an approximate 25minute delay cycle will be in progress.LOWER THAN 11 V.D.C. =HEATINGELEMENTOFFSAFETY DELAY(72)If the battery voltage remains low after thedelay cycle, the automatic controls will lightthe refrigerator on the LP gas mode and stayon the gas mode until the printed circuit boardsees approximately 13.3 volts DC to theterminal block.LOWER THAN 13.3 V.D.C.FOR 25 MIN. OR MORE qL.P. GASOPERATIONA-6-21