RM2604 RM2804 Diagnostic Service Manual
Contents
1. See wiring diagram below and on the next page RM2604 amp RM2804 2 WAY 120 VOLTS ci 120VOLTSAC wr 12VOLISDC 246 REGNIER _ MP WHITE 2 BLACK G GREEN 4 GREEN YELLOW 12 VOLTS DC om 120 VOLISA C E SWITCH B THERMOSTAT TERMINAL BLOCK TERMINAL BLOCK HEATER REIG NTER LAMP M DOOR W TCH Q INDICATON LAMP TERMINAL STRIP ABSORPTION UNIT BRACKET pernos SERVICE MANUAL Dometic RM2604 2804 Refrigerators RM2604 8 RM2804 3 WAY 12 120 VOLTS AAA e e A e ir w e w e e e e HIT 0 ED 5 12 VOLISDC ooo e REIG NITER LAMP WHE o BLACK J Om GREEN GREEN YELLOW SECTION 8 OTHER 8 1 LEVELING Leveling is one of the requirements for proper operation with absorption refrigerators The absorption design utilizes no mechanical pumps or compressors to circu late 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 Without proper refrigerant flow the cooling process will stop The RM2604 and RM2804 has a type of cooling unit that utilizes an enclosed pump tube surrounded by a solution to protect the assembly To insure proper leveling with these models the vehicle needs to be leveled so it is comfortable to live in No noticeable sloping of floor or walls When the vehi2. DIAGNOSTIC SERVICE MANUAL Dometic RM2604 2804 Refrigerators Foreword This service manual is the result of the dedication of The Dometic Corporation 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 Dometic has continued its commitment in providing service people with this the most up to date information about servicing Dometic RV accessories Form No 3 106930 005 2 96 Replaces 05 1409 1 93 l 7 DIAGNOSTIC SERVICE MANUAL a _ hover Refrigerators CONTENTS REO RM2604 2804 STD DIAGNOSTIC FLOW CHART 1 SECTION 1 AC VOLTAGE REQUIREMENTS 0000000000000 ocn ooo 8 SECTION 2 AC COMPONENTS Fa INMI 1 1 Ue 018 14151 iar sts PAE OPE o O 22 o A A 3 SECTION 3 DG VOLTAGE REQUIREMENTS naa SECTION 4 DC COMPONENTS 4 1 a a E inra ga ewandemdeucuel mamas NES 3 4 3 electrodo A e A 4 44 High Voltage esc A E PEA E E T T 4 45 Door Switc TENE PRENTE E PEI pete ses cae teal cas oa inane cece O sce iaavaisenwatatewesa neu EEE NEE ES 5 Ad Heating Element resseca Wd piaia a EN mata ween sa vagnenss 5 SECTION 5 CSS PP GAS REQUIREMEN tata 5 SECTION 6 LP GAS COMPONENTS 6 1 Shut Off Valve oo ccc eccccccecccececcccecececececeucccaueeeceneeeauereeeueeeneeanenes 6 Be A eaee seen ates 6 63 MORIIO
3. amps at 12 volts DC The maximum fuse size is 25 amps for the RM2604 and RM2804 MANUALGA S SHUTO FF VA LVE 3 WAY ONLY 3 PRONG PLUG FOR 120V A C ALL UNITS SECTION 4 DC COMPONENTS 4 1 SWITCH This is the switch that selects the mode of operation 120 volt AC gas and 12 volt DC It is also a circuit interrupter for each mode of operation on the refrigera tor When the customer selects either AC gas or DC 3 way models only operation the selector switch directs electricity first to the interior light and the thermostat and on to the heating element or the igniter for gas mode When this switch is turned off the AC or DC circuit is interrupted To check the switch in the AC mode continuity should exist between these terminals 1 to 1A 2 to 2A and 7 to 7A To check the switch in the gas mode continuity should exist between these terminals 4 to 4A and 7 to 7A To check the switch in the DC mode on 3 way models only continuity should exist between these terminals 5 to 5A 6 to 6A and 7 to 7A NOTE To do a continuity check first be sure all power is disconnected or off to the refrigerator Second remove all wires from the switch After the check be Dometic RM2604 2804 Refrigerators sure switch is wired properly per the wiring diagram See Sec 7 2 When the switch is in the off position a continuity reading SHOULD NOT be indicated on any terminals If the above test results are correct DO
4. between 11 to 12 inches water column If you have less than 11 inches of water column pressure the next step would be to shut off the gas supply and remove the by pass screw Then install a by pass screw that does not have the small o ring on it Next turn on the gas supply and take a reading If the manometer now reads 11 inches of water column the thermostat is defective and must be re placed If the by pass screw test shows no change in pressure the problem lies in the filter See Sec 6 2 the shut off valve See Sec 6 1 or the gas supply See Sec 5 Shut off the gas supply remove the by pass screw replace it with a proper one that has an o ring and turn the gas on NOTE Check for leaks with an approved LP gas leak solution whenever any part of the gas system has been worked on 6 4 BY PASS SCREW The by pass screw is a small brass screw located on any Dometic gas thermostat that regulates gas flow in the low flame mode There are three common sizes of this screw S 17 850 BTU S 14 325 BTU and S 11 300 BTU To check the by pass screw connect a manometer at the pressure test housing The pressure on low flame mode should be 3 to 5 inches water column Above 5 inches water column on low flame mode could cause an over cooling situation The by pass screw used on the RM2604 and the RM2804 is S 14 ponemos SERVICE MANUAL 6 5 SAFETY VALVE The safety valve is an assembly that shuts off the supply of LP gas to the
5. cause defrosting 8 8 HIGH HUMIDITY High humidity may cause a small amount of condensa tion to form on the frame of the refrigerator In some cases it can develop to such a degree that it will run off the frame As the humidity is reduced the sweating will decrease High humidity can also be a factor in rapid formation of frost 8 9 INTERIOR LINER SEAL TO FRAME There is a seal that is applied to the liner in the area where the metal frame makes contact with the interior liner If this seal is incomplete cold air can migrate out to the metal frame If this happens condensation could form on the frame and could promote rapid formation of frost If you suspect an improper seal apply a small bead of silicone all the way around the perimeter where the frame meets the interior liner 11
6. in its new position and carefully retighten the hinge screws If the door needs more adjustment than is available through the hinge adjustment the base can be reposi 10 orcnosne SERVICE MANUAL tioned to re orient the door Turn the refrigerator on its side to gain access to the two front base screws Loosen both screws slightly Reposition the base until the door is re oriented Re tighten the base screws while holding the base in its new position eee S_ gt 23 a NOTE Improper position of the lower door can cause the interior light to stay on when door is closed 8 5 AMBIENT TEMPERATURE This is the temperature surrounding the recreational vehicle as well as the temperature of air at the back of the refrigerator As the ambient temperature increases the air temperature in the area of the cooling unit increases Improper venting at this point will cause the cooling unit to have reduced efficiency ponemos SERVICE MANUAL 8 6 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 To check the cooling unit first verify the AC heating ele ment is good See Sec 2 1 Then place approximately one gallon of wate
7. E FROM SIDE OF CABINET 1 2 FROM COMBUSTIBLE MATERIALS PATH OF AIR FLOW Dometic RM2604 2804 Refrigerators 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 is not sealing properly This should be done on all four sides of the door If a gasket is not sealing properly first warm the gasket material with a hair dryer CAUTION DO NOT OVERHEAT AS YOU CAN MELT THE MATERIAL Then close the door and the magnetic strip should pull the gasket to the metal frame Leave door closed until the material has cooled Then re check for a positive seal If a positive seal cannot be achieved replace the door gasket Also check that the cooling unit is installed properly The cooling unit s foam block the portion that surrounds the evaporator coils must be flush to the cabinet at the back of the refrigerator and have a positive seal If the cooling unit is not installed properly remove and install properly NOTE Air leaks will cause insufficient cooling as well as rapid formation of frost 8 4 DOOR POSITION The door position can be checked by observing any misalignment of the door in relation to the frame To correct an SMOOTH FIT PROPER SEAL alignment of the door loosen the hinge screws slightly and re orient the door in the proper position Hold the door
8. NOT REPLACE the switch If any one of the above tests are not correct REPLACE the switch Term lgn Lamp Term Block Interior Light ella Circuit DC Mode Term on Igniter Gas Mode AC line Y Neutral wy AC Mode 4 AC Heater Thermo Reigniter Lamp Term 30 Term on Relay 86 Term on Door Switch Interior Light Circuit 4 2 IGNITER The igniter is an electronic device that produces high voltage to create a spark at the burner only on gas mode It also produces an increased DC voltage at the L terminal which is directed to the indication lamp each time a spark is produced First check that the switch is in the gas mode and is completing the circuit See Sec 4 1 Next verify proper voltage at the positive and ground terminals of the igniter The reading should be within one volt of incoming voltage at the igniter and lamp terminal block A voltage drop of more than one volt would indicate a loose connection See Sec 7 2 No voltage would indicate an open circuit check switch See Sec 4 1 wiring See Sec 7 2 and DC voltage requirements See Sec 3 Next disconnect DC power at the igniter lamp terminal block Remove high voltage cable from igniter Recon nect DC power the igniter should produce a sparking 4 orcnosne SERVICE MANUAL sound If not replace the igniter Next with the igniter producing spark set the meter on 20 volts DC or lower scale connect meter leads to L
9. P Gas Safety Valve Thermocouple Flue Baffle Flue Cap Orifice Burner Food Storage Air Leaks Interior Liner Seal to Frame High Humidity Wiring Door Switch Door Position DC Volts Heating Element Switch Wiring Relay DC Volts Heating Element Relay REFER TO SECTION 5 6 3 6 2 6 11 6 7 6 8 6 10 22 7 2 6 4 6 3 4 3 5 6 4 6 2 5 65 6 6 6 8 6 9 6 11 6 7 8 7 8 3 8 9 8 8 7 2 4 5 8 4 3 4 4 1 7 2 4 6 3 4 4 6 STEP rouswosne SERVICE MANUAL SECTION 1 AC VOLTAGE REQUIREMENTS The refrigerator is a 120 volt AC 60 Hz appliance The proper operating range is 100 to 132 volts Check the AC volts at the receptacle where the refrigerator is attached Voltage is outside of the proper operating range correct the power source problem SECTION 2 AC COMPONENTS 2 1 HEATING ELEMENT The heating element is designed to deliver a predetermined amount of heat to the cooling unit To check a heating element remove the heater leads from the terminal block and measure for proper resistance across the two leads with a properly calibrated ohm meter This check is to be done with the heating element at room temperature The proper ohms for RM2604 is 48 and RM2804 is 44 with a tolerance of ten percent If the resistance is outside the tolerance range replace the heating element 2 2 THERMOSTAT It is an electric only thermostat On 2 way models it controls the AC heat
10. S a tse caesar EEA ees dered eee ee 6 6 4 Bypass SCIEW cuscstevobencbereeeosuinieebenisniinn amma ian henimeNead 6 B25 E E VAIN E 7 6 6 pence elo aaa 7 CR tete ete es 7 6 8 Flue Bafile E D E E E E E 1 6O FUOD ne eee een ee ence eee ee eee if 6 10 TRIMS UD Oise ss saa e hata ba ce nates usta taie acta bac bacioreracieeue ct cen ease cileeatenen cacti 1 O SOG Or aa a a a a a a EA SECTION 7 WIRING A E arate ecatseasaseaaectausedinans ait cteh nisastleateetlsiavadencttes 7 2 IORI NVIMING sector acid 8 SECTION 8 OTHER Bale A e E 9 E A counseua sewage 9 BS A CAM Season E E EA E S 10 84 Door Poitiers 10 8 9 Ambient TemperallSaan er E 10 8 6 Cooling Unit 2 2 ccc cc ccc eccceccecceccecccuccecceecuuccucceceuscauceuecaseuseueneeees 11 A O v1 AOS 11 SE AI UI ily arar E A 11 8 9 Interior Liner Seal to Frame ccccccceccceccecccuecceccceceueeeeueneeensess 11 ouswosne SERVICE MANUAL Dometic RM2604 2804 Refrigerators This program will address the most common system problems associated with the RM2604 2804 Manual Refrigera tors 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 1 No operation No electric operation No gas operation no spark No gas operation sparks but no flame No cooling on any mode No cooling on gas cools properly on electric No cooling on ele
11. and ground terminals on the igniter The meter should read a pulsating voltage If not replace the igniter If all of the previous checks are correct the igniter is good DO NOT REPLACE The pulsating voltage allows a lamp to illuminate on the front of the refrigerator to advise the customer spark has been produced To check the lamp first verify it is wired correctly Next verify the lamp receptacle is receiving the signal if so and lamp is not illuminating flashing replace the lamp NOTE Do not supply DC power to the lamp It will not illuminate with normal DC power For the lamp to illuminate it must receive an increased DC signal 4 3 ELECTRODE To check the electrode first do a visual inspection for cracks or breaks on the ceramic insulator Also verify the mounting bracket is attached properly to the elec trode If either of the above conditions are found replace the electrode Next check the spark gap It must be set at three sixteenths 3 16 of an inch and the tip of electrode above the slots in the burner ELECTRODE TIP NOTE If igniter See Sec 4 2 and high voltage cable See Sec 4 4 are good and there is no spark at the tip of the electrode REPLACE THE ELECTRODE 4 4 HIGH VOLTAGE CABLE NOTE Be sure switch See Sec 4 1 and igniter See Sec 4 2 are good before checking the high voltage cable and the switch is in the gas mode pernos SERVICE MANUAL To check the high voltage cable firs
12. burner if the flame goes out for any reason This is to ensure that a concentration of un burned gas does not accumulate in the refrigerator vent area To check the safety valve use a known good thermocouple See Sec 6 6 and install into the safety valve Next supply flame to the tip of the thermocouple for 2 to 3 minutes while holding in on the safety valve stem Next remove flame from thermocouple tip and release safety valve stem The safety valve should hold in for at least 30 seconds If it releases earlier than 30 seconds replace the safety valve 6 6 THERMOCOUPLE The thermocouple is a component extending above the burner assembly so the tip is in the path of the flame lt will produce 14 to 30 millivolts DC in normal operation To check the thermocouple use a known good safety valve See Sec 6 5 and attach to the thermocouple Next supply flame to the tip of the thermocouple for 2 to 3 minutes while depressing the safety valve Remove the flame and release the safety valve The valve should hold for at least 30 seconds If it does not hold the safety valve open for 30 seconds replace the thermocouple If it does hold for 30 seconds or more the thermocouple is good do not replace it NOTE Be sure the tip on the thermocouple is clean 6 7 BURNER The burner is a slotted metal tube located below the flue tube on the cooling unit It should be level and the slots in the burner should be directly below the flue tube The
13. burner should be cleaned periodically at least once a year To clean the burner remove from the refrigerator and check for any foreign residue that could cause a deflection of the gas flow or the flame Next soak the burner in an alcohol based solvent and allow to air dry After cleaning reinstall in the refrigerator 6 8 FLUE BAFFLE The flue baffle is designed to concentrate the heat from the gas flame at a certain area of the flue tube It should be cleaned periodically at least once a year To clean remove from the flue tube and check for any damage then clean thoroughly The length of the flue baffle assembly flue baffle and wire for the RM2604 is 31 9 16 inches and for the RM2804 is 37 1 8 inches The flue baffle itself for the RM2604 is 3 4 inch wide and 5 1 4 inches long for the RM2804 is 3 4 inch wide and 6 inches long The proper baffle position for the RM2604 is 1 5 8 inches from the burner to the bottom of the baffle for the RM2804 is 1 3 4 inches from the burner to the bottom of the baffle Dometic RM2604 2804 Refrigerators 6 9 FLUE CAP The flue cap is located at the top of the flue tube and is attached with a screw It must be properly attached or flame outage could occur 6 10 FLUE TUBE The flue tube is a component of the cooling unit It must be cleaned periodically at least once a year To clean remove flue cap and flue baffle then cover the burner and clean by using a flue brush Dometic Pa
14. cle is moving leveling is not critical as the rolling and pitching move ment of the vehicle will pass to either side of level keeping the refrigerant from accumulating in the piping 8 2 VENTILATION Ventilation is one of the requirements for proper cooling unit operation The coach vent system must be able to provide a way to direct the hot air produced by the action of the cooling unit out away from the installation 120 VOLSA C MODE 12 VOLISDC MODE A A meee ew ewe eS eS SWITCH TERMINAL BLOCK TERMINAL BLOCK TERMINAL BLOCK HEATER HEATER RELAY D_ REIG NIER LAMP DOORSWITCH INDICATON LAMP M TERMINAL STRIP WABSO RPTO N UNIT BRACKET of the refrigerator The refrigerator extracts heat from the interior of the refrigerator cabinet and dissipates the heat out through the vent system In a proper installation there should be as little open space as possible sur rounding the sides and top of the refrigerator to achieve proper air flow All potential dead air pockets should be blocked or baffled to insure that heat won t be trapped in these spaces and reduce efficiency In addition the cooling unit should be at least one half 1 2 inch from the nearest surface made of combustible material NOTE Refrigerators should be installed in accordance with appropriate installation instructions received with the refrigerator 8 3 AIR LEAKS J o CLEARANC
15. ctric cools properly on gas Insufficient cooling on all modes Insufficient cooling on electric cools properly on gas CAUSE DC Volts Wiring Switch AC Volts Heating Element Thermostat Switch Wiring DC Volts Igniter Electrode High Voltage Cable Switch Wiring LP gas Filter Orifice Burner Shut off Valve Safety Valve Thermocouple Level Ambient Temperature Cooling Unit LP Gas Thermostat Filter Orifice Burner Flue Baffle Flue Tube AC Volts Heating Element Thermostat Switch Wiring Level Ventilation Ambient Temperature Air Leaks Thermostats Cooling Unit AC Volts Heating Elements Thermostat REFER TO SECTION STEP 3 7 4 1 DODDO OU OON N O ul DDD CoO N NO 6 10 2286 3 Dometic RM2604 2804 Refrigerators SYMPTOM 10 Insufficient cooling on gas Cools properly on electric Freezes on electric cools properly on gas Freezes on gas cools properly on electric On gas mode sparks while flame is lit Won t stay lit on gas Rapid formation of frost Interior light on when door is closed No DC operation cools properly on AC and gas Insufficient cooling on DC cools properly on AC and gas _ rorsnosne SERVICE MANUAL CAUSE LP Gas Pressure Thermostat Filter Orifice Burner Flue Baffle Flue Tube Thermostat Wiring Bypass Screw Thermostat Electrode LP Gas Bypass Screw Filter L
16. ing element On 3 way models it controls the DC heating element as well as the AC heating element The thermostat regulates the cabinet temperature by making and breaking the heat source circuit The internal mechanism breaks contact continu ity when adequate cabinet temperature has been reached Check the thermostat for continuity or use a jumper wire with insulated clips and bypass the thermo stat NOTE Care should be used Do not short to thermostat casing Also remove the jumper after testing is com pleted If the above test allows the refrigerator to operate replace the thermostat SECTION 3 DC VOLTAGE REQUIREMENTS For the refrigerator to operate the interior light igniter gas mode and DC volt operation 3 way models only DC voltage must be supplied to the terminal block or blocks 2 terminal blocks on 3 way models at the rear of Dometic RM2604 2804 Refrigerators the refrigerator The operational range is 10 5 to 15 volts DC Connecting the refrigerator to an unregulated converter can result in improper operation of the refrig erator Check for proper voltage at the terminal block or blocks at the back of the refrigerator If power is outside the operational range correct the power supply problem The power supply to the refrigerator must be fused The interior light and igniter must be on a separate circuit and will draw about 1 amp at 12 volts DC The DC heating element on 3 way models only will draw 18
17. ned on With all other appliances turned off the pressure to the refrigerator should not exceed 12 inches water column To check the gas pressure when the refrigerator is operating there is a pressure test housing located just prior to the orifice PRESSURE TEST HO USING Dometic RM2604 2804 Refrigerators SECTION 6 LP GAS COMPONENTS 6 1 SHUT OFF VALVE It is the valve where the incoming LP gas supply is attached This valve is direct coupled to the selector switch When the selector switch is turned to the electric mode the shut off valve is automatically closed When this same switch is turned to the LP gas mode the valve opens and allows gas flow and the electric circuit to the heating elements is also automatically interrupted To check the shut off valve remove and inspect for any obstructions MANUAL GA S SHUTO FF VA LVE 3 WAY ONLY 3 PRONG PLUG FOR120V A C ALL UNITS 6 2 FILTER A filter is located in the inlet fitting to the gas thermostat It protects the internal valve portion of the thermostat by collecting any particles and or oil that could get into the LP gas line The filter can become saturated and cause a restriction to gas flow This could cause a lack of cooling on gas mode If you suspect a restriction first verify the thermostat See Sec 6 3 and by pass screw See Sec 6 4 are good If these components are good remove the filter and replace with a new one if proper gas pressure is sup
18. plied to the refrigerator and you cannot get proper gas pressure at the pressure test housing LINE SHUTO FF VA LVE y FILTER 7 Y GAS SES THERMOSTAT te a ponsnosne SERVICE MANUAL 6 3 THERMOSTAT On the LP gas mode full line pressure is directed through the thermostat to the burner until the thermostat senses that the refrigerator cabinet has reached proper cooling temperature At that time an internal valve closes and redirects the gas flow through the by pass screw This reduces the amount of LP gas going to the burner assembly The gas flow remains in this by pass mode until the thermostat senses that the refrigerator cabinet needs more cooling Again the thermostat directs LP gas flow through the thermostat at full line pressure until the cabinet temperature is sufficient The thermostat is calibrated by the manufacturer so that at mid range the cabinet temperature should be approximately 40 de grees Fahrenheit To check the calibration of the thermostat place a container of water in the cabinet of the refrigerator and operate at mid range setting until the thermostat is satisfied Then check the temperature of the water It should be approximately 40 degrees We do not recommend any calibration in the field If calibration is not correct replace the thermostat To check the thermostat for proper gas flow set the thermostat to maximum and check the gas pressure at the pressure test port It should be line pressure
19. r inside the refrigerator and place a thermometer in one of the containers of water Next supply 115 volts direct to the AC heating element and operate for at least 12 hours Then check the tempera ture on the thermometer It should be at 45 degrees or lower depending on test conditions See ambient tem perature Sec 8 5 If so the cooling unit is good If the temperature of the water is above 45 degrees replace the cooling unit 8 7 FOOD STORAGE Proper refrigeration requires free air circulation within the food storage compartment Restricted air circulation within this compartment will cause higher cabinet temperatures To remedy this situation simply rearrange your foodstuffs It is also essential that the shelves are not covered with paper or large storage containers Always remember to allow for proper air circulation Odorous or highly flavored foods should always be stored in covered dishes plastic bags or wrapped in foil or waxed paper to prevent food odors Vegetables Dometic RM2604 2804 Refrigerators lettuce etc should be covered to retain their crispness NEVER PUT HOT FOOD INTO THE REFRIGERATOR To reduce frost formation in and on the freezing com partment cover stored liquids and moist foods and do not leave the door open longer than necessary When the refrigerator is heavily loaded it takes a longer time for refrigerator temperatures to lower also increasing the ice making time A very heavy load may also
20. rt Number 0151404001 If the flue tube becomes coated with scale or residue from combustion of LP gas the efficiency of gas operation decreases NOTE After cleaning be sure to reinstall the flue baffle and flue cap 6 11 ORIFICE The orifice is a small brass fitting that has a ruby mem brane that is laser beam drilled and is mounted on the gas line just prior to the burner The orifice should be cleaned periodically at least once a year by using an alcohol based solvent and allowing to air dry Never use a drill bit or jet tip cleaner to clean any orifice as these devices will damage the factory machined part and create a potentially dangerous condition The correct orifice for the RM2604 is number 53 jet for the RM2804 is number 58 jet NOTE Always use the proper orifice Never use a larger orifice as this could cause a lack of cooling problem SECTION 7 WIRING 7 1 EXTERNAL WIRING 1 120 volts AC connection 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 Do not cut or remove the grounding prong from this plug 2 12 volt connection for igniter and interior light The connection is made to the terminal block marked 12 volts DC REIGNITER LAMP The interior light and the igniter must be connected to a separate battery circuit and will draw about 1 amp at 12 volts DC 3 12 volt DC connec
21. t disconnect DC power at the igniter lamp terminal block Next discon nect high voltage cable from electrode Then reconnect DC power to the terminal block If sparking starts cable is good DO NOT REPLACE check the electrode See Sec 4 3 If no sparking disconnect DC power at the igniter lamp terminal block and then disconnect high voltage cable at the igniter Reconnect DC power to the terminal block If sparking sound from igniter replace the high voltage cable 4 5 DOOR SWITCH The door switch is an open switch when the switch arm is depressed interior light should be off When the refrigerator door is open the switch is closed interior light should be on Check that the switch assembly is properly aligned and that it is not broken Check the switch assembly for continuity When the switch arm is depressed there should not be continuity When the switch arm is NOT depressed there should be continuity If any of the checks are incorrect replace the switch 4 6 RELAY 3 WAY MODELS ONLY The relay controls the circuit to the DC heating element The load amps of the DC heating element goes through the relay To check the relay first verify the selector switch is on DC mode See Sec 4 1 and the thermostat See Sec 2 2 is NOT completing the circuit Next verify voltage is present between terminals 85 and 30 If voltage is not present check wiring to both terminals See Sec 7 2 Next check for voltage bet
22. tion for heater 3 way models only This connection is made to the terminal block marked DC VOLT HEATER The refrigerator must be connected to the battery circuit with two wires of Dometic RM2604 2804 Refrigerators adequate capacity to avoid voltage drop The wire gauge should be chosen with consideration to the wire length in accordance with the following table MAXIMUM TOTAL CONDUCTOR WIRE LENGTH IN FEET AWG RM2604 RM2804 Int Light Only 10 17 17 55 8 27 27 85 Do not use the body or chassis of the vehicle as a substitute for either of the two conductors No other electrical equipment or lighting should be connected to the refrigerator circuit The refrigerator will draw 18 amps at 12 volts DC Key Th ile DO NOT OPERATE THE REFRIGERATOR ON 12 VOLT WHEN THE VEHICLE IS PARKED THE CUS TOMER WILL RUN OUT OF BATTERY IN A RATHER SHORT TIME IF POSSIBLE THE INSTALLATION OF A 12 VOLT OPERATED REFRIGERATOR SHOULD BE COMPLETED WITH A RELAY MOUNTED EITHER IN THE TOW VEHICLE OR IN THE RECREATIONAL VEHICLE THIS RELAY WILL AUTOMATICALLY CUT OUT THE REFRIGERATOR WHEN THE MOTOR IS STOPPED orcnosne SERVICE MANUAL BREAKER POINT 12V DC HEA TER REIG NTER A ND INTERIOR LIGHT BA TIERY ENGINE 7 2 INTERNAL WIRING Check all wires and the connectors to ensure a proper and tight connection Also verify the refrigerator is wired per the wiring diagram for the model you are working on
23. ween terminals 85 and 87 If voltage is present the relay is defective and needs to be replaced Second verify the selector switch is on DC mode See Sec 4 1 and the thermostat See Sec 2 2 is completing the circuit Next verify voltage is present between terminals 85 and 86 If no voltage is present check wiring and connections See Sec 7 2 Next if voltage is present between 85 and 86 terminals then voltage should be present Dometic RM2604 2804 Refrigerators between terminals 85 and 87 If no voltage is present the relay is defective replace it 4 7 HEATING ELEMENT 3 WAY MODELS ONLY The heating element is designed to deliver a predeter mined amount of heat to the cooling unit Check the heating element with ohms resistance using a properly calibrated ohm meter This check is to be done with the element at room temperature The proper ohms for RM2604 and RM2804 DC heating element is 67 with a tolerance range of ten 10 percent If the heating element is outside the tolerance range replace it NOTE It will take a very precise ohm meter to accurately read this measurement If a precise ohm meter is not available a continuity reading will indicate an open or com plete circuit If an open circuit is the test result replace the element SECTION 5 LP GAS REQUIREMENTS The LP gas pressure to the refrigerator should be 11 inches water column with half of all BTU s of the RV tur
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