Norcold 322 Repair Manual

Also see for 322 Series: Installation and owner's manual Installation and owner's manual Replacement manual

Contents

troubleshooting

Norcold 322 Repair Manual Manual pdf 8 page image

TroubleshootingFailure of RefrigerationFailure of refrigeration does not necessarily indi-cate that the cooling system is defective. Other fac-tors governing its operation must be checked.If the refrigerator has been operating on gas and aloss of cooling is noted, convert the refrigerator toelectric operation, AC power (See "Start-Up Instruc-tions - AC Electric Operation"). If the refrigerator hasbeen operating on electric, switch it to gas operation.This will determine if a component failure in the elec-tric or gas controls is causing the cooling fault.After the refrigerator has been converted from onepower source to the other (gas to electric, or electricto gas) allow several hours to assure the unit is cy-cling properly. At the end of the period the finsshould start to cool providing the following itemshave been checked out thoroughly.1. The refrigerator is level in each direction.2. The controls have been properly set for thepower source utilized.3. The power source is at the correct 10.5 - 11inches water column for gas at the refrigerator’spressure tap (Figure 2) and 108-132 volts AC forelectric or 11.5 to 15.4 volts DC.4. The upper and lower vents are not obstructedrestricting ventilation.If no cooling is evident after a reasonable time pe-riod, the cause of failure may be due to a blockedsystem. This blockage is caused when the refrigera-tor is operated for extended periods in an off-levelcondition beyond the range of 3 degrees left to rightand 6 degrees front to back. This does not mean thesystem is non-functional, but requires the refrigera-tor to be removed from the vehicle and placed on itsright side when facing the front for a minimum of onehour. This will allow the ammonia and water to mixwith one another which is necessary in the absorp-tion system operation.Once the system has been relieved of its blockage,operation on AC should once again be initiated for areasonable time period to determine if the coolingprocess has been restored. If after this period thefins have no indication of cooling on either gas orelectric the refrigerator will have to be replaced.Refrigerator Not Cooling on ACUSE EXTREME CAUTION WHEN WORKING ONTHE AC ELECTRICAL COMPONENTS OF THEREFRIGERATOR. BEFORE REPLACING ANYELECTRICAL COMPONENT, DISCONNECT THEAC POWER SOURCE TO THE REFRIGERATOR.ELECTRICAL CURRENT CAN CAUSE SEVEREELECTRICAL SHOCK OR DEATH.If the refrigerator is not cooling with the Selectorswitch in the AC mode - yet cools in the gas mode -the AC heater is probably not energized. Check thefollowing:1. Check for 110 volts to the heater at AC Termi-nals 1 and 2 (See Figure 3 for location).Connect Manometerto Pressure Tap TeeFigure 2Figure 3 - Identification Terminal Block ConnectionsWARNING7