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Dometic RM7732 manual

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Table of contents for the manual

  • Page 1

    Foreword This service manual is the result of the dedication of The Dometic Corporation and it s engineer s 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. Dom[...]

  • Page 2

    37 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators PAGE NO. CONTENTS RM7030/RM7732 DIAGNOSTIC FLOW CHART ........................... 1 SECTION 1 OPERATION 1.1 RM7030 (Prod. #921890201 & 921890301) Refrigerator Operation .......................................................... 5 1.2 RM7030 (Prod. #921890401) Refrigerator Operat[...]

  • Page 3

    36 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL CONTENTS PAGE NO. SECTION 8 WIRING 8.1 External Wiring .................................................................. 21 8.2 Internal Wiring ................................................................... 21 SECTION 9 OTHER 9.1 Leveling ......................................[...]

  • Page 4

    1 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators This program will address the most common system problems associated with the Dometic RM7030/RM7732 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. 1 . No operation[...]

  • Page 5

    2 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL 8. Insufficient cooling on gas  cools properly on AC. 9 . Freezes on all modes. 10 . Changes preset mode. 11. Flame failure light within 10 seconds. 12. Flame failure light after 3 minutes. 13. Interior light ON when door is closed. 14. Rapid formation of frost. 15 . Water on fram[...]

  • Page 6

    3 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators SYMPTOM CAUSE REFER TO STEP 18 . No AC operation  operates on gas. 19 . No gas operation  operates on AC 20. Insufficient cooling on all modes. 21. Insufficient cooling on AC  cools properly on gas. 22. Insufficient cooling on gas  cools properly on AC. 23. Freezes. 24 . [...]

  • Page 7

    4 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL 26. Interior light on when door is closed. 27. Rapid formation of frost. 28 . Water on frame. ICE MAKER SECTION 29. Ice Maker fails to start. 30 . Ice Maker won't make ice. 31 . Keeps making ice and won't shut off. 32 . Not making enough ice. 33 . Too much water is coming o[...]

  • Page 8

    5 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators AES FULLY AUTOMATIC MODE Turn switch "C" to the "ON" position. The bulb above push-button "A" will light up green, indicating that the control system is in the fully automatic mode. In this mode, 120 volts AC operation has first priority, meaning the ref[...]

  • Page 9

    6 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL FLAME FAILURE DURING LP GAS OPERATION If the LP gas flame fails during the burner cycle, the high voltage spark will continue arcing for up to three minutes. At the end of three minutes the gas control will stop the flow of LP gas to the burner, the sparking will stop and the red ind[...]

  • Page 10

    7 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators 3. Press the TEMPERATURE SELECTOR button (3) until the lamp at the desired position is illuminated. 4. When operating in the AES mode, the AES mode indicator lamp "B" will illuminate. The control system will automatically select between AC and GAS operation with AC having p[...]

  • Page 11

    8 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL GAS MODE Move the AUTO mode selector button (2) to the UP position. The GAS mode indicator lamp (C) will illumi- nate. After 45 seconds the burner should be ignited and operating normally. On the initial refrigerator start-up, it may take longer than 45 seconds to allow air to be pur[...]

  • Page 12

    9 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators SECTION 2 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. If voltage is outside of the proper operating range, correct the power sourc[...]

  • Page 13

    10 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL 5.2 THERMISTOR RM7030 (Prod. No. 921890401) and RM7732 To determine if the temperature sensor is functioning properly, perform the following test. Remove the cover from the lower circuit board. Discon- nect the thermistor harness from the P2, 2-pin terminal on the lower circuit boar[...]

  • Page 14

    11 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators Next, hook up a manometer at the test port. Then check for DC volts at gas valve terminals while the unit is in trial-for-ignition. If DC volts are present and pressure is low, replace the valve. If DC volts are not present at the valve while unit is in trial-for-ignition, verify th[...]

  • Page 15

    12 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL 5.7 FUSES A. RM7030 (Product No. 921890201 & 921890301) The fuse is to protect the circuit board. To check the fuse, remove it from the holder and do a continuity check. If no continuity, replace it with a proper 3-amp time delay fuse. B. RM7030 (Product No. 921890401) and RM773[...]

  • Page 16

    13 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators B. AES FUNCTION SWITCH NOTE : The following checks should be made on the upper circuit board and harness assembly BEFORE replacing the upper circuit board or wiring harness. The checks are to be done with the wiring harness REMOVED from the lower circuit board, and the ON- OFF switc[...]

  • Page 17

    14 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL With the mode switch (?) NOT depressed : A reading would NOT be indicated. NOTE : If the check on AC mode lamp and switch is not correct, verify the wire harness has continuity. If wire harness is good, replace the upper circuit board. G. DELAY MODE LAMP AND SWITCH NOTE : The follow[...]

  • Page 18

    15 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC MODE NOTE : The PAL tester will allow for proper testing of the integrity of the upper and lower circuit boards. PAL is available from your Dometic parts distributor. This control system has an integral Diagnostic/ Test sequence. Access to the diagnostic sequence unit is [...]

  • Page 19

    16 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL C. GAS OPERATION THESE PROCEDURES MUST BE FOLLOWED IN SEQUENCE AND AT THE PROPER TERMINALS OR DAMAGE TO THE BOARD WILL RESULT. Before you check the circuit board for gas operation, verify these components are good: Igniter (Sec 5.5A) High Voltage Cable (Sec. 5.6A) Electrode (Sec. 5.[...]

  • Page 20

    17 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators Check for voltage at the heating element connection terminals J7 and J8 on the circuit board. If no voltage is present, check the 5 amp AC and 3 amp DC fuses. If fuse is defective, replace the fuse. If fuses are good, replace the circuit board. G. GAS MODE : NOTE: The PAL tester wil[...]

  • Page 21

    18 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL 5.11 ELECTRODE First, do a visual check for cracks or breaks on the ceramic insulator. Verify the mounting bracket is attached properly to the elec- trode. If either of the above is found, replace the electrode. The spark gap must be set at three sixteenths (3/16") of an inch a[...]

  • Page 22

    19 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators SECTION 7 LP GAS COMPONENTS 7.1 MANUAL GAS Shutoff VALVE The manual gas shutoff valve is where the incoming LP gas supply is attached. To check the shutoff valve, remove and inspect for any obstructions. The valve must be turned to "ON" before any gas operation can occur. [...]

  • Page 23

    20 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL 7.2 ORIFICE The orifice is a small brass fitting that has a ruby membrane that is laserbeam drilled and is mounted on the gas line just prior to the burner. The orifice is cleaned by using an alcohol based solvent and allowing to air dry. NEVER USE A DRILL BIT OR JET TIP CLEANER TO [...]

  • Page 24

    21 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators 7. 4 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 burner should be cleaned periodically, at least once a year. To clean the burner, remove from t[...]

  • Page 25

    22 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL TYPICAL WIRING DIAGRAM FOR RM7030 ( PRODUCT NO. 921890201 & 921890301)[...]

  • Page 26

    23 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators TYPICAL WIRING DIAGRAM FOR RM7030 (PRODUCT NO. 921890401) 6 1 1 C S B L BLA CK BROW N RED ORANGE G REEN A5 B5 C5 D5 E5 B2 A2 WH I T E WH I T E J6 J5 J4 J3 J2 J7 J1 0 J8 O P A A3 B3 C3 F G 7 1 2 3 U N N K H 2 M R 2 + - 1 2 4 P3 E 4 5 1 I J 12V D C 2 D 2 1 1 1 2 2 WH I T E YE L LO W B[...]

  • Page 27

    24 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL RM7732 TYPICAL WIRING DIAGRAM[...]

  • Page 28

    25 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators SECTION 9 OTHER 9.1 LEVELING In an absorption refrigerator system, ammonia is liquefied in the finned condenser coil at the top of the refrigerator. The liquid ammonia then flows into the evaporator (inside the freezer section) and is exposed to a circulating flow of hydrogen gas, w[...]

  • Page 29

    26 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL RM7732: SECURING THE REFRIGERATOR: After the refrigerator is mounted in place (ensuring a combustion seal at the front frame), the refrigerator is to be secured in the enclosure with six screws. The screws have to be installed in the following order: STEP 1: Two screws installed thr[...]

  • Page 30

    27 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators 9.4 DOOR POSITION The door position can be checked by observing any misalignment of the door in relation to the frame. NOTE : Improper position of the refrigerator door can cause the interior light to stay on when the door is closed. To adjust either door, loosen the hinge bracket s[...]

  • Page 31

    28 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL 9.9 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 c[...]

  • Page 32

    29 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators SECTION 10 ICE MAKER OPERATION The refrigerator must be allowed to precool properly before starting the ice maker. The refrigerator has to be connected to 120 volts AC before the ice maker can operate. The water line manual shutoff valve must be open. To start making ice, move the i[...]

  • Page 33

    30 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL 11.4 SHUTOFF ARM The shutoff arm is cam driven. It operates a switch to control the quantity of ice produced. During the ejection cycle the arm is raised and lowered during each of the two revolutions of the timing cam. If the shutoff arm comes to rest on top of the ice in the stora[...]

  • Page 34

    31 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators 11.8 ICE MAKER ASSEMBLY It may be necessary to replace the entire ice maker assembly. Disconnect power to the appliance. Disconnect the leads inside the ice maker unit. Check each wire for continuity to make sure the wiring is good before replacing the ice maker unit. If there is no[...]

  • Page 35

    32 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL[...]

  • Page 36

    33 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators[...]

  • Page 37

    34 DOMETIC® RM7030/RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL SECTION 12 ICE MAKER  OTHER 12.1 WATER FILL ADJUSTMENT The correct water level in the mold is important for the proper production of ice. The size of the ice cubes depends on the amount of water which enters the mold. The cubes should be approximately 1/2" wide, 3/4" hi[...]

  • Page 38

    35 DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732 Refrigerators 12.2 WIRING Refer to the wiring diagram supplied with the unit you are working on, and make sure all wiring connections are correct and tight. THIS IS AN ENERGIZED CIRCUIT. ELECTRICAL SHOCK CAN OCCUR. BEFORE CHECKING THESE COMPONENTS BE SURE THERE IS NO POWER TO THE APPLIANCE. ICE M[...]