Norcold N620 Service Manual

Contents

Norcold N620 Service Manual Manual pdf 24 page image

Service Manual 24Diagnosing 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 systemcontents can cause severe skin and eye burns, andcan ignite and burn with an intense flame. Do notbend, drop, weld, move, drill, puncture, or hit thecooling 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 therefrigerator 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 unit has aleak, do not operate the refrigerator. Replace thecooling unit before operating the refrigerator.- If you smell ammonia, the cooling unit has a leak andmust be replaced.- If you see a yellow powder or residue anywhere at therear of the refrigerator or in the enclosure, the cooling unithas a 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 theinsulation sleeve. During normal operation,some tubes of the cooling unit are hot. Do nottouch any tubes of the cooling unit.- Within 20 minutes of starting the refrigerator, touchthe outside of the insulation sleeve.- The outside of the insulation sleeve should be warmto the touch.- If the outside of the insulation sleeve is not warm, theselected energy source may not be operatingcorrectly.- 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 thetouch, make sure the unit is cooling correctly.- Within one hour after starting up the refrigerator,touch the fins on the inside of the fresh food com-partment.- 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.Refrigerator MaintenanceGas flame appearance:While in propane gas operation, examine the gas flame:- Open the lower intake vent.- Turn the thermostat to “9”.CAUTION: The burner box cover can be hot. Weargloves to avoid burns.- Open the burner box door [3] and look at the gas flame [1](See Art00982 and Art00955).- The flame should be a darker blue inside and alighter blue outside and should be a constant andsteady shape.- The flame should not be yellow and should not havean erratic and unstable shape.- Make sure the flame does not touch the inside of theflue tube [2].- Close the burner box door.Remove and clean the burner orifice:To remove and clean the burner orifice:- Close the valve at the propane gas tank(s).- Close the manual shut of valve of the refrigerator.- Push the ON/OFF button to stop the refrigerator.CAUTION: The burner box cover can be hot. Weargloves to avoid burns.- Open the lower intake vent.- Remove the flare nut from the orifice assembly [1] (SeeArt00994).- Remove the orifice assembly from the burner [2].WARNING: When cleaning, do not try to remove theorifice [3] from the orifice adapter [4]. Removal willdamage the orifice and seal of the orifice and cancause a propane gas leak. Leaking propane gascan ignite or explode and result in dangerouspersonal injury or death. Do not clean the orificewith 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.