Dometic RM 3762 Service Manual
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Dometic RM 3762 Service Manual

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DIAGNOSTIC SERVICE MANUAL
NEW GENERATION REFRIGERATOR
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
Form No. 3312124.000 10/07
©2007 Dometic Corporation
LaGrange, IN 46761
RM 3762 & RM 3962

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  • Page 1 DIAGNOSTIC SERVICE MANUAL NEW GENERATION REFRIGERATOR RM 3762 & RM 3962 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 Form No. 3312124.000 10/07 ©2007 Dometic Corporation...

  • Page 2: Safety Instructions

    This service manual is the result of the dedica- This manual has safety information and instruc- tion of Dometic Corporation Technical staff and tions to help users eliminate or reduce the risk its engineers in giving service people the nec- of accidents and injuries.

  • Page 3: Table Of Contents

    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 ..................10 SectIon 4 dc Voltage DC Voltage Requirements ...............10 SectIon 5 dc comPonentS Thermistor ......
  • Page 4 contentS Page no. SectIon 7 7.5 Flue Baffle ....................17 7.6 Flue Tube .....................17 SectIon 8 coolIng unIt 8.1 Leveling....................18 8.2 Ventilation ....................18 8.3 Air Leaks....................20 8.4 Interior Liner Seal to Frame ..............20 8.5 Door Position ..................21 8.6 Ambient Temperature ................21 8.7 Cooling Unit ...................21 8.8 Food Storage ..................21 8.9 High Humidity ..................21...
  • Page 5 This program will address the most common system problems associated with the RM3762 and RM3962 refrigerators supplied by Dometic Corporation. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms.
  • Page 6 SYMPTOM CAUSE SECTION & PAGE 4, page 10 Check light on DC Volts 5, page 14 & section 9 page 23 Wiring 6, page 16 LP Gas 7, page 16 Manual Gas Valve 5, page 11 Solenoid 7, page 16 Orifice 7, page 17 Burner...

  • Page 7: Refrigerator Operation

    SectIon 1 refrigerator operation dISPlay Panel rm3762 , rm3962 refrigerator control Panel Main Power Button ON/OFF Press the button to turn the refrigerator on or off. 2. AUTO/GAS Mode Selector Button Press the button to turn the auto mode on or off. 3.
  • Page 8 refrigerator control Panel led display Panel The LED display panel provides a quick visual indicator of the temperature of the food in the fresh food cabinet, modes of operation, status messages and alarm conditions. LED Panel Indications Status Information Display is on Refrigerator on Display is off Refrigerator off...

  • Page 9: Refrigerator Overview

    refrIgerator oVerVIeW automatIc energy Selector control SyStem aBSorPtIon coolIng SyStem he refrigerator is equipped with an automatic energy se- lector control system. The user turns the refrigerator on, In an absorption refrigerator system, ammonia is liquefied selects the desired temperature and then, the refrigera- in the finned condenser coil at the top rear of the refrig- tor automatically selects the most suitable energy source erator.

  • Page 10: Ac Voltage

    description of operating modes a low ambient control. If it so happens that the tempera- ture in the refrigerator has satisfied the thermostat set- auto mode ting, and the CUT-OUT threshold has been reached, the When operating in the AUTO mode, the AUTO mode refrigerator cycles OFF.

  • Page 11: Ac Components

    DC power by a series of diodes that rectify alternat- recommended that the receptacle be located to the left ing current to DC. The Dometic control system will only side (opposite side of refrigerator burner assembly) of the tolerate up to 6 AC volts on the DC line. AC ripple can be refrigerator (viewed from the rear).

  • Page 12: Dc Components

    Channel Products, Inc., Gasliter Mark 6, Model 12 E, will unit is in trial-for-ignition. If DC volts are present and pres- VOID the Warranty on the refrigerator. The Dometic refer sure is low, replace the valve. If DC volts are not present could use a few different igniters.

  • Page 13: High Voltage Cable

    5.6 control Panel do not use the Channel Mark 6, Model 12 E igniter. Check for continuity between the solder joints when the button is held down. If the control panel has continuity it is ok. From the 4 pin connection at the control panel conti- nuity can be tested for proper operation also.

  • Page 14: Led Display Panel

    5.9 lower Board 5.8 led display Panel P1 To upper display board With the control panel in the OFF position, check for DC P2 Thermistor voltage at Plug 1, Terminal 4 (orange wire) positive and P3 To gas valve and igniter terminal 5 (red wire) negative DC volts at the lower circuit J1 Positive 12V DC from thermofuse / terminal block board.
  • Page 15 rm3762 & rm3962...

  • Page 16: Door Switch

    5.12 thermofuse note: all current dometic control boards are The RM3962/3762 cooling units have a Thermofuse lo- cated on the boiler. The function of the thermofuse is to 3 try systems in the gas mode. there is a...

  • Page 17: Lp Gas Requirements

    7.2 Orifice check the gas pressure when the refrigerator is operating, The Dometic orifice is a brass alloy with a man-made ruby there is a pressure test port below the solenoid valve as- pressed in the center that has been laser-beam drilled in sembly.

  • Page 18: Burner

    Clean by using volts are 20 or below erratic operation will occur. Anything a flue brush, Dometic Part no. 0151404001. below 10 to 13 the control board will not keep the gas valve energized and turn on the check light after the third trial-for-ignition.

  • Page 19: Leveling

    SectIon 8 coolIng unIt typical roof Vent and Side Wall Vent 8.1 leveling Leveling is one of the requirements for proper operation of absorption refrigerators. The absorption design utilizes no mechanical pumps or compressors to circulate the re- frigerant within the system, so proper leveling must be maintained to provide the correct refrigerant flow.
  • Page 20 typical two Side Wall Vent application. always refer to Vent Instructions 3308666.xxx...

  • Page 21: Air Leaks

    8.3 air leaks 8.4 Interior liner Seal to frame Check the gasket on the doors to be sure of a positive There is a seal that is applied to the liner in the area air seal. A simple method to check gaskets is to close where the metal frame makes contact with the interior the door on a dollar bill, then pull the dollar bill out.

  • Page 22: Door Position

    note: to form a proper seal, it is important not to If so, the cooling unit is good. If the temperature of the leave any gaps. water is above 43 degrees, replace the cooling unit. The outside temperature will affect the cooling capacity of the 8.5 door Position unit.

  • Page 24: Internal Wiring

    SectIon 9 WIrIng SectIon 11 diagnostic mode 9.1 Internal Wiring 11.1 diagnostic test 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. (See applicable wiring diagrams for your model refrigera- To perform a diagnostic test: tor) A loose connection can create erratic operation.

  • Page 25: Ice Maker

    The refrigerator has to be connected to 120 volts AC before the ice maker can operate. The water line manual shutoff valve (not part of Dometic unit) must be open. To start making ice, move the ice level bail arm to DOWN position.

  • Page 26: Mold Switches

    10.5 Shut off arm 10.7 timing motor The shutoff arm is cam driven. It operates a switch to con- This is a low-wattage, stall-type motor which is geared to trol the quantity of ice produced. During the ejection cycle the timing cam and ice ejector. It is a one RPM motor. To the arm is raised and lowered during each of the two revo- check the motor, disconnect power to the appliance and lutions of the timing cam.

  • Page 27: Water Supply

    10.11 Water Supply 10.9 Ice maker replacement To operate properly, the water pressure in the water sup- ply line must be between 15 and 50 PSI. Lower water pressure, water turned off, or obstructions or air in the wa- ter line can cause low or no ice production. First check to see that the water supply is fully turned on.
  • Page 30 note tHe relatIVe PoSItIon of tHeSe comPonentS In tHe folloWIng ScHematIcS non energIzed cIrcuIt energIzed cIrcuIt after a few degrees of motor rota- tion, the timing cam switches the holding switch to its normally open position; this assures completion of the cycle.
  • Page 31 once again after a few degrees of rotation the timing cam closes the Near the completion of the first rev- holding switch providing a circuit to olution, the timing cam closes the the motor that will assure completion water valve switch. However since of this revolution.
  • Page 32 near the completion of the second revolution the timing cam again closes the water valve switch. this time a circuit is completed through the ejection cycle ends the mo- the water valve solenoid, its switch ment that the holding switch and mold heater.

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