Norcold N260.3 Series Service Manual

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Norcold N260.3 Series Service Manual Manual pdf 15 page image

SERVICE MANUAL15www.norcold.comControls, cont’d.When the outside air temperature is below 50° F., the refrigeratormay have a tendency to freeze food. To reduce the tendency tofreeze food:- Turn the gas control to LO position.- Keep the refrigerator full.- Put foods that are more likely to freeze on the lower shelf.The gas control has a gas safety valve built into it. As long as aflame is present, the safety valve is open and allows propane gasto flow to the burner. Any loss of flame (empty gas tank, blow out,etc.) closes the safety valve and stops the flow of propane gas.The piezo lighter [216] makes a spark which ignites the flame atthe burner.The 3 Amp fuse [220] protects the AC wiring of the refrigerator.The 20 Amp fuse [223] (model 323) protects the DC wiring of therefrigerator.Modes of OperationThe controls are designed so that each mode of operation isindependent of the others. The refrigerator will still operate in theGAS mode without any electrical input.Gas ModeThe GAS mode uses a thermocouple system to produce a self-generating power (millivolts). The Thermocouple, when heatedby the burner flame, produces enough millivolts to hold the safetyvalve open. A loss of flame de-energizes the safety valve andshuts the propane gas down. An Interrupter device is coupled inseries with the thermocouple so that the milliamperes cannot flowto the Safety Valve (part of the Control Valve) until the Interruptercontacts are shunted (jumpered). The shunt is provided by theSelector switch when it is switched to GAS mode. The Selectorswitch not only serves as a mode selector but also as an interlockbetween modes so that two sources of power cannot be energizedsimultaneously.The GAS mode utilizes an adjustable GAS control. The control canbe manually adjusted to meter the fixed amount of propane gasto the burner thereby acting as a temperature control to maintaincabinet temperature.Note: This is not an automatic gas control. It does not change theflame from high fire to low fire as other RV refrigerators. If the cooling loadchanges, you must manually change the gas control to maintain the sametemperature inside the refrigerator.The gas ignition method uses a piezo spark ignitor requiring amanual ignition of the burner. See the Lighting Instructions.To change the desired temperature setting, push and turn thegas control to the HI, MED, or LO position. HI is the coldesttemperature setting.Note! The gas control changes the amount of propane gas that goesto the burner. It is not an automatic gas control. It does not change theflame from high fire to low fire. If the cooling load changes, you mustmanually change the gas control to maintain the same temperature insidethe refrigerator.When the outside air temperature is less than 50° F (10° C), therefrigerator may have a tendency to freeze food at the coldertemperature settings. To reduce the tendency to freeze food:■ Turn the gas control to the LO position.■ Keep the refrigerator full.■ Put foods that are more likely to freeze on the lower shelf.AC and DC ModesThe AC mode is thermostatically controlled by an adjustablethermostat. The thermostat has a capillary sensor attached to thecooling fin. The AC electric heater will cycle in response to the fintemperature to maintain the cabinet temperature. The DC mode isnot thermostatically controlled. When operating in DC Mode, theDC heater is on continually.DC Operation PrecautionsThe refrigerator is made to operate on DC power while the vehicleis “in transit” and neither AC power nor propane gas sources areavailable. Operate the refrigerator on DC power only while thevehicle engine is running.■ For the refrigerator to operate correctly on DC power, the bat-tery must be in a fully charged condition.■ For the battery to be fully charged at all times during refrigeratoroperation, the vehicle engine must be running and the batterycharging system must be in good operating condition.■ While the vehicle engine is running, make sure the voltage atthe DC power supply leads at the refrigerator is more than 11.5VDC.