Norcold 322 Repair Manual
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Norcold 322 Repair Manual

Norcold refrigerator repair guide
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Summary of Contents for Norcold 322

  • Page 2 Norcold Repair Guide Section 12 Models 322, 323 Table of Contents Page 12-2 Specifications & Operating Limits 12-2 General Instructions 12-3 Electrical Connections 12-4 Description of Operation 12-5 Lighting & Start-Up Instructions 12-6 Preventative Maintenance 12-7 Troubleshooting 12-17 Removal & Replacement Procedure...
  • Page 3 120 volts AC or 12 volts DC. by screws through holes provided. Model 322 is shipped from the factory as a 2- THIS REFRIGERATOR IS NOT INTENDED TO BE Way unit to operate on propane gas or 120 volts OPERATED AS A FREE STANDING UNIT (I.E.
  • Page 4 A 12 volt DC supply connection is only necessary if the refrigerator is a 3-Way model - either a Model 2-Way Models 3-Way Models 323 or a Model 322 with the DC option added by a min. wire max. fuse min. wire max.
  • Page 5 Operation The controls are designed so that each mode of The GAS mode utilizes an adjustable GAS con- operation is independent of the other. All electricity trol. The control can be manually adjusted to me- could be cut off and the refrigerator still operate in ter the fixed amount of propane gas to the burner the GAS mode.
  • Page 6 1. Verify that 120 volts AC is available to the refrig- pletely shut down the refrigerator. erator and that the AC fuse (C) in the control bracket is operational. Manual Shut-Off Valve 323 models & 322 (shown in open position) Figure 1 model with DC add-on...
  • Page 7 Inspect the controls, piping and wiring to insure that they are in good condition. THESE MAINTENANCE PROCEDURES MUST BE PERFORMED BY A QUALIFIED SERVICE PER- SON. NORCOLD CANNOT ACCEPT RESPONSIBILITY FOR REPAIRS, ADJUSTMENT, OR MAINTE- NANCE PERFORMED BY OTHER THAN A QUALIFIED DEALER OR SERVICE CENTER.

  • Page 8: Troubleshooting

    Troubleshooting Failure of Refrigeration and 6 degrees front to back. This does not mean the system is non-functional, but requires the refrigera- Failure of refrigeration does not necessarily indi- tor to be removed from the vehicle and placed on its cate that the cooling system is defective.
  • Page 9 WARNING NEVER OVER FUSE A CIRCUIT. REPLACE BLOWN FUSE WITH EXACT REPLACEMENT IN- GAS-AC-DC DICATED BY NORCOLD. OVER FUSING OF A Selector Switch CIRCUIT CAN RESULT IN A FIRE. Figure 5 - Thermostat Jumper Connection If the fuse is good (and still no voltage to the heater), the problem is an open circuit either in b.
  • Page 10 4. Ground Fault Test: With the Selector switch Continuity Test: With the Selector switch still in still in the AC position and the AC Supply cord the AC position and the AC cord disconnected, disconnected, use an Ohmmeter (set on highest use an Ohmmeter to measure resistance be- scale) to measure resistance between the HOT tween the HOT and NEUTRAL prongs of the AC...
  • Page 11 6. If the Continuity Test indicated in TABLE 2 Poor Cooling in AC Mode measures an open, remove the heater leads at If the refrigerator is cooling poorly in AC yet satis- Terminals 1 & 2 and install a jumper across ter- minals 1 &...
  • Page 12 VISUAL OBSERVATIONS CAUTION Check thermocouple position in flame. Refer to Figure 8. The Thermocouple should be seated DO NOT OVER-TIGHTEN THE CONNECTIONS securely in its bracket with the sensing end ex- ON EITHER SIDE OF THE INTERRUPTER. THE tended over the flame, as shown. Lack of proper CORRECT PROCEDURE FOR BOTH CONNEC- Thermocouple position can cause flame blowout TIONS IS TO TURN THE CONNECTOR UNTIL IT...
  • Page 13 Check to insure the main gas pressure is set at 11" W.C. with only the refrigerator running. Then check with all other gas appliances operating. This check assures the main tank regulator is properly functioning. Make sure the customer is using propane, not a mixture of Butane, etc.
  • Page 14 • If the above inspections do not show reasons The tip of the Thermocouple must not touch the for incorrect pressure, the problem is in the metal fire tube or any metal part; this condition Control Valve. Replace the Control Valve refer- could prevent the flame from locking in.
  • Page 15 4. Ground Fault Test: With the Selector switch still BLOWN FUSE WITH EXACT REPLACEMENT IN- in the DC position, disconnect the DC Supply at DICATED BY NORCOLD. OVER FUSING OF A Terminals 5 and 6. Use an Ohmmeter (set on CIRCUIT CAN RESULT IN A FIRE.
  • Page 16 Figure 16 - Ground Fault Test - DC Figure 17 - Continuity Test - DC...
  • Page 17 TABLE 3 DC Ground Fault/Continuity Check Test Points Ohmmeter Reading Indication Action Terminal 6 & Chassis 0 Ohms Indicates a grounding fault Go to Step 5 See Figure 16 (dead short) Terminal 6 & Chassis Possibility of ground Open Circuit Normal condition See Figure 16 fault is eliminated...
  • Page 18 Removal & Replacement Procedures AC Heater Removal & Replacement Reinstall the insulation around the flue tube making sure the insulation completely sur- rounds the flue tube. WARNING 8. Tape the insulation closed. 9. Insure that the insulation does not obstruct the USE EXTREME CAUTION WHEN WORKING ON opening in the flue tube.
  • Page 19 WARNING NEVER OVERFUSE A CIRCUIT. REPLACE BLOWN FUSE WITH EXACT REPLACEMENT INDICATED BY NORCOLD. OVERFUSING OF A CIRCUIT CAN USE TWO WRENCHES WHEN TIGHTENING OR RESULT IN A FIRE. UNTIGHTENING GAS FITTINGS. LEAK TEST AF- TER WORKING ON ALL GAS FITTINGS. FAILURE 12.
  • Page 20 3. Remove the outlet tube flare fitting from the Gas 9. To reinstall the Thermocouple reverse the above Control Valve. procedure. Note: Do not remove the brass elbows from the 10. Leak test all gas fittings removed. valve body. 4. Remove the two screws that secure the Gas Control Valve to the Control Assembly.
  • Page 21 Thermostat Removal & Replacement 1. Turn off the gas supply at the main tank. 2. Remove the flare fitting from the inlet tube of the WARNING Gas Control Valve. 3. Remove the outlet tube flare fitting from the Gas USE TWO WRENCHES WHEN TIGHTENING OR Control Valve.
  • Page 22 Note: Do not attempt to remove the orifice body Refrigerator Removal & Reinstallation from the brass adapter since the orifice is pressed on at the factory to assure a 1. Remove the AC cord from the AC receptacle. good seal. 2.
  • Page 23 Wiring Diagrams...

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