DIAGNOSTIC SERVICE MANUAL AMERICANA & AMERICANA PLUS RM 2351, RM 2354, RM 2451, RM 2454 RM 2551, RM 2554, RM 2652, RM 2662 RM 2663, RM2852, RM2862 & NDR1062 USA SERVICE OFFICE Dometic Corporation 2320 Industrial Parkway Elkhart, IN 46516 574-294-2511 CANADA Dometic Distribution 46 Zatonski Unit 3 Brantford, Ontario CANADA N3T 5L8 519-720-9578 For Service Center Assistance Call: 800-544-4881 Form No. 3311143.
Safety Instructions Foreword This service manual is the result of the dedication of The Dometic Corporation Technical staff and its engineers in giving service people the necessary instruction for making accurate analyses of certain conditions. Provided is a diagnostic chart leading a qualified mechanic into the service manual pages to locate and solve symptoms which may occur.
CONTENTS PAGE NO. DIAGNOSTIC FLOW CHART............................................................................. 4 SECTION 1 OPERATION Refrigerator Operation ....................................................................................6 SECTION 2 AC VOLTAGE AC Voltage Requirements............................................................................9 SECTION 3 AC COMPONENTS Heating Element .......................................................................................
CONTENTS PAGE NO. SECTION 7 7.5 Flue Baffle.............................................................................................20 7.6 Flue Cap ..............................................................................................20 7.7 Flue Tube .............................................................................................20 SECTION 8 COOLING UNIT 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 Leveling..................................................................................
This program will address the most common system problems associated with the RM2351, RM2354, RM2451, RM2454, RM2551, RM2554, RM2652 ,RM2662,RM2663,RM2852and RM2862 refrigerators supplied by The Dometic Corporation. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms. SYMPTOM CAUSE SECTION & PAGE 1.
SYMPTOM CAUSE SECTION & PAGE 9. DC Volts Wiring LP Gas Manual Gas Valve Solenoid Orifice Burner Thermocouple Lower Circuit Board 4, page 10 9, page 26 6, page 19 7, page 19 5. page 11 7. page 19 7. page 20 7. page 20 5. page 13 10. Interior light on when door is closed Wiring Low Ambient Switch Door Switch Door Position 9. page 26 5. page 18 5. page 18 8. page 24 11. Rapid formation of frost Food Storage Interior Liner to Frame High Humidity Air Leaks 8. page 26 8. page 23 8. page 26 8.
SECTION 1 REFRIGERATOR OPERATION DISPLAY PANEL RM2351, RM2451, RM2551, RM2652, RM2852 AUTO TEMPERATURE CONTROL Refrigerator Control Panel RM2652 & RM2852 RM2662 & RM2862 AMERICANA 2-WAY MODEL 1. Main Power Button ON/OFF 2. AUTO/GAS Mode Selector Button RM2451 & RM2551 A. AUTO Mode indicator lamp B. CHECK indicator lamp (Gas Mode Only) C.
DISPLAY PANEL RM2354, RM2454, RM2554 RM2663 3-way DISPLAY PANEL RM2662, RM2862 2-WAY Refrigerator Control Panels 3-WAY 2-WAY 3-WAY RM2454 & RM2554 Travel Latch RM2354 1. Main Power Button ON/OFF 2. DC Mode Selector Button 3. AUTO/GAS Mode Selector Button 4. Temperature Selector Button A. DC Mode Indicator Lamp B. AC Mode Indicator Lamp C. GAS Mode Indicator Lamp D. AUTO Mode Indicator Lamp E. CHECK Indicator Lamp (Gas Operation Only) F. Temperature Indicator Lamps 2-WAY 1.
OPERATION INSTRUCTIONS OPERATION Auto Thermostat A. A continuous 12 volt DC supply must be available for the electronic control to function. B. Press the main power ON/OFF button (1) to the DOWN position. C. In AUTO mode, the AUTO lamp A will be illuminated. The control system will automatically select between AC and GAS operation with AC having priority. The temperature is controlled by a factory preset temperature setting. D.
a period of approximately 45 seconds with two minutes (purge) interval after each trial. If unsuccessful, the CHECK indicator lamp (B) will illuminate. To restart GAS operation, press the main power ON/OFF button (1) to the OFF and then ON position. The control system will attempt a new ignition sequence. If the refrigerator has not been used for a long time or the LP tanks have just been refilled, air may be trapped in the supply lines.
The refrigerator will not switch to another mode of operation until all AC power is lost. The refrigerator is equipped with a three-prong (grounded) plug for protection against shock hazards, and should be plugged directly into a properly grounded three-prong receptacle. SECTION 4 DC VOLTAGE DC Voltage Requirements Clean Direct Current (DC) power is mandatory for hightech circuits to operate as designed. A battery will provide straight line DC power.
SECTION 5 DC COMPONENTS 5.1 DC Heating Element Remove the heater leads from the lower circuit board or relay and measure for proper resistance across the two leads. You should obtain the following readings ± 10%: Model Watts Amps Volts Ohms RM2354 150 12.5 12 .96 RM2454 175 15.0 12 .80 RM2554 175 15.0 12 .80 RM2663 215 18.0 12 .67 NOTE: The DC mode is a holding mode not a full cooling mode.
5.5 High Voltage Cable If sparking starts during trial-for-ignition, the cable is good. If there is no sparking during trial-for-ignition, disconnect DC power at the refrigerator terminal block or switch unit off. Disconnect high voltage cable from electrode. Reconnect DC power. If there is a sparking sound from the igniter during trial-for-ignition, then replace high voltage cable or electrode. On newer units the electrode and high voltage cable are integrated into one component.
Wires from control board P3 harness to relay. Terminal 85 P3-3 harness blue negative. Terminal 86 P3-4 harness blue positive. Wires to relay from DC source and DC heater. Terminal 87 to DC heater positive. Terminal 30 positive from DC power source. If DC voltage to terminals 85 & 86, but no continuity between 30 & 87 the relay will need to be changed. Refer to wiring diagram on the back of the product or check parts list for proper diagram. To acquire the proper wiring diagram always use the product number.
WIRING ORIGINAL STYLE CONTROL 3 / 2 WAY, 2 WAY WILL NOT HAVE A J1 TO DC HEATER 14
15 S T N B U O BLACK BROWN RED ORANGE GREEN 7 6 7 6 Q A 1 J7 3 J8 2 L N GND 9 2 J5 J1 P P2 P1 WHITE WHITE J2 C J6 J4 3308727.
WIRING INTERGRATED IGNITER CONTROL Part number 3850712013 16
Lower Board Testing ALL TESTS ARE TO BE DONE WITH THE REFRIGERATOR IN THE COOLING MODE. The millivolts meter should read between 25 to 35 millivolts with the gas flame burning. When the power module senses the loss of flame (thermocouple voltage below 13 MVDC) the 45 seconds trial for ignition period is started. Turning the refrigerator OFF–ON while operating in the gas mode may cause a check light. DC Volts Note: A loose ground will create erratic or no gas operation on all systems.
5.10 Door Switch When the low ambient control is turned on it by-passes the interior light switch and turns on the interior light. The heat load of the 10 watt light bulb will cause the cooling unit to cycle approximate every 35 to 55 minutes. This will help keep the temperature in the freezer in the freezing zone. In low ambient temperatures the freezer will warm up because the refer box will not call for much cooling.
SECTION 6 LP GAS REQUIREMENTS 6. No bubbles should appear at the opening of the burner jet orifice. The presence of bubbles indicates a defective gas safety shutoff, and service is required. 7. If no bubbles were present at the burner jet orifice, it should be rinsed with fresh water. Be careful not to damage the burner jet orifice. Replace cover and press the main power ON/OFF button (1) OFF and back ON. Normal operation of the burner should return.
7.3 Thermocouple MODEL The Thermocouple is a component that extends over the burner assembly so its tip is in the path of the flame. During normal gas operation, the thermocouple should produce 25 to 35 millivolts when connected to the lower circuit board. Any reading below 18 millivolts could cause erratic gas operation. Note: A reading of 18 or less could be caused by low gas pressure, carbon build up or improper thermocouple location.
SECTION 8 COOLING UNIT 8.1 Leveling Typical Roof Vent and Side Wall Vent Leveling is one of the requirements for proper operation of absorption refrigerators. The absorption design utilizes no mechanical pumps or compressors to circulate the refrigerant within the system, so proper leveling must be maintained to provide the correct refrigerant flow. Without proper leveling, refrigerant within the cooling unit will collect and stagnate at certain areas.
Typical Two Side Wall Vent Application. Always Refer To Vent Instructions 3308666.
8.3 Air Leaks 8.4 Interior Liner Seal To Frame Check the gasket on the doors to be sure of a positive air seal. A simple method to check gaskets is to close the door on a dollar bill, then pull the dollar bill out. If no resistance is felt, the gasket in that place is not sealing properly. This should be done on all four sides of the door in several places. If a gasket is not sealing properly, lift up inside of door gasket and insert 1/4” ball of fiberglass insulation at all four corners on both doors.
Note: To form a proper seal, it is important not to leave any gaps. 8.5 Door Position If the upper or lower door is closing too high or low against the frame, cold air leakage can occur. Adding or deleting a flat thin washer on top of the lower or middle hinge pin can raise or lower the door position. To correct the door alignment, loosen the hinge screws slightly and reorient the door in the proper position. Hold the door in its new position and carefully retighten the hinge screws. 8.
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SECTION 9 WIRING 9.1 Internal Wiring 8.7 Cooling Unit The cooling unit is a self-contained, hermetically sealed set of coils where the refrigeration process takes place. The chemicals involved in the cooling process include hydrogen, ammonia, water and a rust inhibiting agent. There are no repairs recommended on the cooling unit. If it is defective, replace with a new cooling unit.
10.4 Mold Thermostat When the ice maker thermostat senses the preset temperature for ejection of the ice cubes, the fingers will start to rotate, dumping any ice cubes and filling the mold with water. When the storage container is full of ice, the ice level bail arm cannot return to the DOWN position. This will stop further production of ice until the container is emptied and the bail arm is returned to the down position.
10.9 Ice Maker Replacement This is an energized circuit. Shock can occur if not tested properly. Testing is to be done by a qualified service technician. 10.7 Timing Motor This is a low-wattage, stall-type motor which is geared to the timing cam and ice ejector. It is a one RPM motor. To check the motor, disconnect power to the appliance and test for continuity between the two leads. If you DO NOT have continuity, replace the motor. If you have continuity and the motor runs, DO NOT replace.
WHITE AC NEUTRAL TO BOARD J6 BLACK AC LINE 12 VDC POSITIVE TO BOARD J5 J2 OR J3 HEATER WATER LINE 10.11 Water Supply To operate properly, the water pressure in the water supply line must be between 15 lbs. PSI and 125 lbs. PSI. Lower water pressure, water turned off, or obstructions or air in the water line can cause low or no ice production. First check to see that the water supply is fully turned on. Visually check the line for kinks, etc. which might obstruct the flow of water.
30 ICE MAKER TYPICAL WIRING DIAGRAM
NOTE THE RELATIVE POSITION OF THESE COMPONENTS IN THE FOLLOWING SCHEMATICS NON ENERGIZED CIRCUIT ENERGIZED CIRCUIT After a few degrees of motor rotation, the timing cam switches the holding switch to its normally open position; this assures completion of the cycle. The mold heater remains energized through the thermostat circuit. During the first half of the cycle, the shut-off arm is raised and lowered by the timing cam and operates the shut-off switch. This is a freeze cycle.
Near the completion of the first revolution, the timing cam closes the water valve switch. However since the thermostat is still closed the mold heater circuit is energized. Current will not pass through the water valve solenoid and its switch. (Electrical current follows the path of least resistance.) Once again after a few degrees of rotation the timing cam closes the holding switch providing a circuit to the motor that will assure completion of this revolution. The mold heater remains energized.
Near the completion of the second revolution the timing cam again closes the water valve switch. This time a circuit is completed through the water valve solenoid, its switch and mold heater. The water valve solenoid received about 105 volts. The remaining 10 volts to the mold heater are not noticeable. When the water valve solenoid is energized, the valve opens and water refills the mold. The ejection cycle ends the moment that the holding switch is closed by the timing cam.
