Norcold Repair Guide 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 12-22 Wiring Diagrams 1 Section 12
General Information and Specification Operating Limits - Models 322, 323 Current Draws - 322, 323 AC Mode: 132 VAC Max., 108 VAC Min. AC Heating Element - 1.3 amps @ 110 Volts AC 1.4 amps @ 120 Volts AC DC Mode*: 15.4 VDC Max., 11.5 VDC Min. DC Heating Element* - 11.7 amps @ 12 Volts DC 13.6 amps @ 14 Volts DC Gas Mode: 11" W.C. Gas Supply ± 0.5" W.C. 10.5" W.C. Min.
Information About Electrical Connection TABLE 1 12 Volt Supply Wiring & Fuse Size 12 Volt DC Supply Connection A 12 volt DC supply connection is only necessary if the refrigerator is a 3-Way model - either a Model 323 or a Model 322 with the DC option added by a dealer. Both the AC and GAS modes operate without a need for 12 volts. 2-Way Models 3-Way Models min. wire max. fuse min. wire max.
Operation The GAS mode utilizes an adjustable GAS control. The control can be manually adjusted to meter the fixed amount of propane gas to the burner thereby acting as a temperature control to maintain cabinet temperature. The controls are designed so that each mode of operation is independent of the other. All electricity could be cut off and the refrigerator still operate in the GAS mode. 12 Volts is not necessary to operate the control circuit.
Lighting and Start-Up Instructions WARNING DO NOT HOLD GAS VALVE (D) IN MORE THAN 30 SECONDS, IF FLAME IS NOT INDICATED WITHIN THIS TIME, TURN GAS TO OFF, WAIT 2 MINUTES AND RETRY. CONTINUING TO HOLD GAS VALVE IN WILL CAUSE GAS BUILD-UP IN THE BURNER AREA AND CAN RESULT IN AN EXPLOSION WHICH CAN CAUSE PERSONAL INJURY OR DEATH. Lighting Instructions - Gas Operation 2. Set the Energy Selector Switch (A) to the AC position and verify that the Gas Control Selector (D) is in the OFF position. 3.
Preventative Maintenance Maintenance Check List A safety and performance check should be made annually. The schedule should include at least the following: a. b. c. d. e. f. g. h. i. Leak test the gas lines. Check combustion seal; repair or replace, if necessary (Visual check without removing the refrigerator.). Inspect or clean the burner or burner orifice. Check/adjust the electrode spark gap. Insure the Thermocouple tip is clean and secure in the burner bracket.
Troubleshooting Failure of Refrigeration and 6 degrees front to back. This does not mean the system is non-functional, but requires the refrigerator to be removed from the vehicle and placed on its right side when facing the front for a minimum of one hour. This will allow the ammonia and water to mix with one another which is necessary in the absorption system operation. Failure of refrigeration does not necessarily indicate that the cooling system is defective.
If there b. is no reading, the possibilities are a) AC supply not connected, b) 3 Amp fuse blown, c) wiring connections, or d) defective switch or thermostat. Proceed to Step 2. If voltage is measured (108-132 volts), then the heater or the wiring to the heater is defective or the heater is not positioned properly in the heater well. Proceed to the Continuity test in Step 4. 2. If no heater voltage is measured, disconnect the AC supply cord and measure the voltage at the AC receptacle.
Continuity Test: With the Selector switch still in the AC position and the AC cord disconnected, use an Ohmmeter to measure resistance between the HOT and NEUTRAL prongs of the AC cord connector, as in Figure 7. Read the Ohmmeter and refer to TABLE 2. 4. Ground Fault Test: With the Selector switch still in the AC position and the AC Supply cord disconnected, use an Ohmmeter (set on highest scale) to measure resistance between the HOT and GROUND prongs, as illustrated in Figure 7.
Poor Cooling in AC Mode 6. If the Continuity Test indicated in TABLE 2 measures an open, remove the heater leads at Terminals 1 & 2 and install a jumper across terminals 1 & 2 (See Figure 3 for location). Repeat the Continuity Check. If the refrigerator is cooling poorly in AC yet satisfactory in the GAS mode, the problem could be one of the following: If after installing the jumper, the Ohmmeter now shows a short, the heater has the open circuit and must be replaced. Remove jumper from terminals 1 & 2.
VISUAL OBSERVATIONS * CAUTION Check thermocouple position in flame. Refer to Figure 8. The Thermocouple should be seated securely in its bracket with the sensing end extended over the flame, as shown. Lack of proper Thermocouple position can cause flame blowout symptoms or failure to hold the flame when trying to ignite the burner. DO NOT OVER-TIGHTEN THE CONNECTIONS ON EITHER SIDE OF THE INTERRUPTER.
* 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. * Check the flame appearance. Refer to Figure 11. The flame should emerge from all four burner slots with a steady blue color without yellow or smoky tips.
• If the above inspections do not show reasons for incorrect pressure, the problem is in the Control Valve. Replace the Control Valve referring to page 12-18 for replacement procedure. The tip of the Thermocouple must not touch the metal fire tube or any metal part; this condition could prevent the flame from locking in.
Refrigerator Not Cooling on DC probing through the end of the Quick Connectors as shown in the illustrations. If the refrigerator is not cooling with the Selector switch in the DC mode - yet cools in the other modes - the DC heater is probably not energized. Check the following: If the DC heater is now energized when power is applied, replace the Thermostat. If not, remove jumper and go to (b.) below. 1. Check for 12 volts to the heater at DC heater Terminals 3 (+) and 4 (-). See Figure 3 for location.
Figure 16 - Ground Fault Test - DC Figure 17 - Continuity Test - DC 15
TABLE 3 DC Ground Fault/Continuity Check Test Points Terminal 6 & Chassis See Figure 16 Terminal 6 & Chassis See Figure 16 Terminal 5 & 6 See Figure 17 Ohmmeter Reading 0 Ohms (dead short) Indication Action Indicates a grounding fault Go to Step 5 Open Circuit Normal condition Possibility of ground fault is eliminated 1.21 - 1.37 Ohms* Heater is good Go to Step 7 Terminals 5 & 6 See Figure 17 above 1.37 Ohms or below 1.
Removal & Replacement Procedures AC Heater Removal & Replacement Reinstall the insulation around the flue tube making sure the insulation completely surrounds the flue tube. WARNING 8. Tape the insulation closed. 9. Insure that the insulation does not obstruct the opening in the flue tube. USE EXTREME CAUTION WHEN WORKING ON THE AC ELECTRICAL COMPONENTS OF THE REFRIGERATOR. BEFORE REPLACING ANY ELECTRICAL COMPONENTS, DISCONNECT THE AC POWER SOURCE TO THE REFRIGERATOR.
Block, tagging each wire or otherwise identifying for reconnection later. WARNING WARNING NEVER OVERFUSE A CIRCUIT. REPLACE BLOWN FUSE WITH EXACT REPLACEMENT INDICATED BY NORCOLD. OVERFUSING OF A CIRCUIT CAN RESULT IN A FIRE. USE TWO WRENCHES WHEN TIGHTENING OR UNTIGHTENING GAS FITTINGS. LEAK TEST AFTER WORKING ON ALL GAS FITTINGS. FAILURE TO DO SO COULD RESULT IN A GAS LEAK WHICH COULD RESULT IN A FIRE OR EXPLOSION, WHICH COULD CAUSE PERSONAL INJURY OR DEATH. 12.
3. Remove the outlet tube flare fitting from the Gas Control Valve. Note: Do not remove the brass elbows from the valve body. 9. To reinstall the Thermocouple reverse the above procedure. 10. Leak test all gas fittings removed. 4. Remove the two screws that secure the Gas Control Valve to the Control Assembly. Piezo Lighter Removal & Replacement 5. Remove the two red wires from the Thermocouple Adaptor. WARNING 6. Remove the Thermocouple from the Thermocouple Adapter. 7.
Thermostat Removal & Replacement 1. Turn off the gas supply at the main tank. 2. Remove the flare fitting from the inlet tube of the Gas Control Valve. WARNING 3. Remove the outlet tube flare fitting from the Gas Control Valve. USE TWO WRENCHES WHEN TIGHTENING OR UNTIGHTENING GAS FITTINGS. LEAK TEST AFTER WORKING ON ALL GAS FITTINGS. FAILURE TO DO SO COULD RESULT IN A GAS LEAK WHICH COULD RESULT IN A FIRE OR EXPLOSION, WHICH COULD CAUSE PERSONAL INJURY OR DEATH. 4.
Refrigerator Removal & Reinstallation Note: Do not attempt to remove the orifice body from the brass adapter since the orifice is pressed on at the factory to assure a good seal. 1. Remove the AC cord from the AC receptacle. 2. Turn off the gas supply at the main tank. 4. Install orifice assembly, insure orifice assembly is wrench tight in burner. 3. Remove the LP gas supply line from inlet fitting. 5. Reconnect flare nut to orifice assembly. 4.
Wiring Diagrams 22
