Norcold N300 Service Manual

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Norcold N300 Service Manual Manual pdf 7 page image

Service Manual N300 Models - 7Diagnosing Cooling ProblemsWARNING: The refrigerator cooling system is underpressure. Do not try to repair or to recharge a defectivecooling system. The cooling system contains sodiumchromate. The breathing of certain chromium com-pounds can cause cancer. The cooling system contentscan cause severe skin and eye burns, and can igniteand burn with an intense flame. Do not bend, drop,weld, move, drill, puncture, or hit the cooling system.Make sure the cooling unit has the correct ventilation:- Make sure that the intake and exhaust vents are notblocked.- Make sure that the air flow through the back of the refrig-erator is not decreased or blocked.- Make sure the ventilation baffle is correctly installed.Examine the cooling unit for leaks.WARNING: If you think that the cooling system has aleak, do not operate the refrigerator. Replace the cool-ing unit before operating the refrigerator.- If you smell ammonia, the cooling unit has a leak and mustbe replaced.- If you see a yellow powder or residue anywhere at the rearof the refrigerator or in the enclosure, the cooling unit hasa leak and must be replaced.Determine if the cooling problem occurs while operating therefrigerator on propane gas, AC electric, and DC electric:- Determine if the selected energy source is operating andheating correctly:CAUTION: Touch only the outside of the insula-tion sleeve. During normal operation, sometubes of the cooling unit are hot. Do not touchany tubes of the cooling unit.- Within 20 minutes of starting the refrigerator, touch theoutside of the insulation sleeve.WARNING: When cleaning, do not try to removethe orifice [3] from the orifice adapter [4]. Removalwill damage the orifice and can cause a propane gasleak. Leaking propane gas can ignite or explode andresult in dangerous personal injury or death. Do notclean the orifice with a pin or other objects.- Clean the orifice assembly with air pressure and alcoholonly.- Using a wrench, assemble the orifice assembly to theburner.- Assemble the flare nut to the orifice assembly.- Examine all of the gas connections for leaks.Wiring DiagramWiring PictorialThe parts of the wiring pictorial are (See Art01020):1. ............................................................ 120 VAC Power cord2 ....................................................................... Terminal block3 ............................................................................ 3 Amp fuse4 ...................................................................... Selector switch5 ....................................................................... Thermocouple6 ............................................... Thermostat / gas safety valve7 ...................................................... Thermocouple interrupter8 .......................................................................... Flame meter9 .............................................................................. AC heater10 .............................. -12 VDC Power supply (3-way models)11 ............................. +12 VDC Power supply (3-way models)12 ...............................................20 Amp fuse (3-way models)16 .................................................. DC heater (3-way models)The parts of the wiring diagram are (See Art01021):1. ............................................................................... 120 VAC2 ............................................................................ 3 Amp fuse3 ............................................................................ Thermostat4 .............................................................................. AC heater5 ................................................................................ 120 VAC6 ....................................................................Gas safety valve7 ...................................................... Thermocouple interrupter8 .......................................................................... Flame meter9 ...........................................................................Piezo lighter10 ............................................................................ Spark gap11 ..................................................................... Thermocouple12 .................................................... +12 VDC (3-way models)13 ...............................................20 Amp fuse (3-way models)14 .................................................. DC heater (3-way models)15 ............................................. -12 VDC Com(3-way models)17 .................................................................... Selector switch- The outside of the insulation sleeve should be warm tothe touch.- If the outside of the insulation sleeve is not warm, theselected energy source may not be operating cor-rectly.- Start up the refrigerator on a different energy sourceand repeat the procedure for all energy sources.- If the outside of the insulation sleeve is warm to the touch,make sure the unit is cooling correctly.- Within one hour after starting up the refrigerator, touchthe fins on the inside of the fresh food compartment.- The fins should feel cold to the touch.- If the fins do not feel cold to the touch after two hours,the cooling unit is not operating correctly.- If the cooling problem does not occur when operating onall energy sources, the problem is not the cooling unit.- Use the “Troubleshooting Charts” to determine thecause of the problem.