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Dometic RM 24 Fridge Service Manual

1. s Flint lighter Piezo lighter DIAGNOSIS Trouble shooting electric operated refrigerators Trouble shooting gas oprated refrigerators Failed refrigerating unit Operation analysis for electric operated refrigerators Operation analysis for LP gas operated refrigerators Periodic maintenanc 37 38 39 40 41 42 42 42 43 43 43 43 43 44 44 44 44 45 47 48 49 50 51 52 1 TECHNICAL FEATURES RM24 The cabinet has a so called Full Finish Casing and can be used freestanding or built in RM24 is a compact refrigerator ideal for campers fitted with front frame and seals This refrigerator is fitted with right hand door with change over facility to left hand door and exchangeable front door panel in an aluminium framed door Exchange can be made without the removal of the door A full range of equipment is available operated from the rear of the cabinet A blow out protection flue is fitted as standard to assist in maintaining flame stability under adverse wind conditions A sealing frame is fitted around the cabinet for building in purposes The refrigerator has one basic casing which is Foamed in place with a lining Insulation material polyurethane The construction of the door complete is an aluminium extruded door frame foamed in place with the door pan and magnetic gasket Equipment Fool pro
2. Check that no burrs are inside valve housing B which may cause leaks Screw plug A onto the valve housing B taking care not to damage the threaded hole in the aluminium cap of the housing Plug A must be properly tightened to the valve housing to ensure contact betveen the thermo element and the magnetic coil vithin the housing REPLACEMENT OF THE SAFETY VALVE MAGNET If the safety valve magnet is defective it cannot be repaired but tust be replaced When the safety valve magnet needs replacement proceed as follows see fig 60 1 Unscrew the connection plug A on the thermocouple from the housing nut B8 2 Unscrew the housing nut B and remove the defective safety valve magnet C from the housing D 9 Fit a new magnet valve and ensure that it is properly inserted in the housing D 4 Fit the housing nut B and the connection plug A and check that a good contact between the contact plug E on the thermocouple and the contact F on the safety valve magnet is obtained 37 18 REPLACEMENT or HEATER The electric heater is positioned in a pocket which is welded to the boiler tube A wire clip holds the heater securely in the pocket see fig 61 RM36C RM46 RM47 RM66 RM67 RM24 RM76 RM77 Wire clip Fig 61 Fig 62 Fig 63 To replace the heater first check that the wall plug is disconnected then unscrew lock screws A Fig 62 on the Lower lid B and upper lid C Push the lid B do
3. bubble level see Fig 73 is supplied with the refrigerator The level should be placed on the ice tray compartment shelf and the position of the bubble observed if necessary C e with the aid of a small mirror Adjust the position rd of the vehicle so that the bubble is in the center ring of the level Fig 73 When the vehicle is on tow the continuous rolling and pitching movement will not affect the refrigerator as long as the movement passes either side of level but when the vehicle is temporarily parked the sensitivity of the refrigerator should be remembered 29 TEMPERATURE CONTROL THERMOSTAT 1 When the temperature control thermostat is set at a higher number refrige rating effect will be increased This will tend to lover the temperature in the freezing compartment and in the food storage compartment When the temperature control is set at a lower number refrigerating effect will be reduced When the temperature control is set at mid dial position medium refrigerating effect will be produced 2 The position of the temperature control should depend upon the refrigerator load When the food load is heavy turn the temperature control to a higher number A higher setting of the temperature control will be required in summer than in winter The setting of the temperature control determines the action of the thermostat in relation to freezing compartment temperatures 30 THE THERMOSTAT CAPILWRY TUBE nio On the
4. 4 Gas equipped recreational vehicles and mobile homes Ventilation The installation shall be made in such a manner as to separate the combustion system from the living space of the recreational vehicle Openings for air supply or for venting of combustion products shall have a minimum dimension of not less than l4 inch Approved installation requires one lower fresh air intake and one upper exhaust vent The accessory ventilation kits shown in these instructions have been tested and approved for use with the refrigerator models identified Their use is recommen ded and when employed the ventilation kits must be installed and used without modification An opening to the outside at floor level of the refrigerator compartment must be provided for ventilation of heavier than air fuel gases The lower vent in the Dometic kits is provided with proper size openings Gas connect ion Hook up to the gas supply line is accomplished at the manual gas valve which is furnished with a 3 8 SAE male flare connection All completed connections should be checked for leaks with soapy water CAUTION When connecting the gas line to the gas valve on the gas el equipment at the rear of the refrigerator use a back up wrench to prevent undue rotation of the gas cock For hook up and servicing purpose the lower vent is constructed as a lift out panel The gas supply system must incorporate a pressure regulator to maintain a supply pressure of not
5. 5 12V 110V for RM36C RM46 RM47 RM66 RM67 4 Tra dcin VOCARI a Terminal block O uy A E E white I pes gj c Tee S c l 1 000 1 i 9 Reg LP Gos Fuse OFF q aj q nv IQ al ecz i D x GE CG F See ellow E E DH t c Hak GE TO QO sive AC a 2 WIRING Thermostot ee RE senes L SUE ren rea 4 ite L Switch 5 5 Fig 66 20 PRESSURE MEASURING DEVICES The pressure at the burner should be checked at the time the refrigerator is started up After connecting the pressure gauge set the thermostat dial at MAX Turn on the gas at the union cock and light the burner At the MAX setting the pressure reading should be 11 280 mm The L P gas is supplied directly to the thermostat from the regulator fitted on the gas bottle at pressure of 11 280 mm Water U gauge fig 67 The water gauge consists of a glass U tube filled to mid point with water When gas pressure is exerted on one side of the gauge the water on that side is forced down and there is a corresponding rise of water on the other side Water column pressure per square inch is indicated by the difference of the two columns of water measured in inches A convenient scale reading in inches and tenths of an inch is rounted bctveen the two columns When reading the gauge proceed as follows If the gauge is filled with water to zero and the lower column is 5 5 inches 140 mm below zero the other column will also be 5 5
6. Improper door sealing on cabinets can be corrected by slackening the upper and lower hinge fixing screws and moving the door inwards or outwards as required until a satisfactory seal is obtained If a good seal cannot be obtained a new gasket should be installed 3 It is also essential to check that the cabinet opening through which the freez ing compartment enters the cabinet should be properly sealed by sealing compound If this seal leaks warm air enters the cabinet causing high cabinet temperatures and excessive frost formation on the freezing compartment 37 ODORS INSIDE THE REFRIGERATOR Odors inside the refrigerator are caused by improper food storage They may also be caused by too infrequent cleaning of the food compartment or the refrigerator has been shut off for some time with the door closed 38 ODORS FROM FUMES 1 Odors outside the refrigerator may be caused by gas leaks Make sure that all gas appliances are closed Test gas connections and all joints in the gas line with soap and water solution up to and including gas cock Never look for a leak with an open flame Use a flashlight when necessary in looking for soap bubbles caused by leaks The gas line should be free of kinks and sharp ends Turn on gas cock light burner and test connections between the gas cock and the burner carefully with soap and water 2 Odors outside the refrigerator may be caused by improper burner flame 3 The flame touches side of th
7. Unit 515A gas electric operation for model RM76 without defrosting device 21 WATER SEPERATOR CONDENSER FREEZER EVAPORATOR ASSL FRESH FOOD EVAPORATOR C ABSORBER VESSEL BOILER 22 9 OPERATION ANALYSIS FOR COOLING UNIT It is obviously important that all external factors affecting the unit should be checked properly before aunit is condemned as faulty and that emphasis has been placed upon the necessity for correct installation upright refrigerator correct heat input baffle position etc Check the size and the wattage of the electric heater and make sure that the heater element is inserted to its full length in its pocket If the electric heater is only partly inserted the heat distribution will be incorrect causing an excessive vaporizing of the ammonia within the boiler when operating on electricity The same symptom can show up with too much or too little heat input either on electric or on gas operation and also if the refrigerator had been operating in an off level position or with inadequate ventilation If an excessive vaporizing of the ammonia within the boiler occurs due to the reasons above the liquid mixture in the boiler becomes very weak and the pump will cease to operate which means that the circulation of liquid stops with the result that the evaporator inside the cabinet ceases to produce cooling Such a blockage of the unit in the liquid circuit is most usually
8. change switch A is set at the appropriate position 25 41 Turn off the gas valve C its handle vill then be pointing avay from the back of the cabinet Turn the voltage change switch A to the required setting then connect the refrigerator to t appropriate voltage supply When the electrical supply cord is connected to a 110 volt A C supply tne voltage on the switch A should show 110V when connected to tnebattery the voltage on the switch A should show 12V Turn the electric thermostat knob E to No 4 HOW TO START THE REFRIGERATOR RM36C RM46 RM47 RM66 RM67 RM76 RM77 26 GAS OPERATION Fig 72 2 To start the refrigerator turn the knob A to position Gas Tne gas valve is now opened and the electric circuits are disconnected Turn the gas thermostat knob C to setting 4 Pull the knob D of the flame failure safety device and after 5 10 seconds press the button E to the piezo lighter The pressing may have to be repeated Through the reflector F it can be observed that the burner is lit After the burner has been lit keep the knob D in pulled out position for another 5 seconds Then release the knob and check through the reflector that the burner stays lit Note After a replacement of the gas container or a long shut off period the gas pipes are likely to be filled with air In such a case the lighting procedure has to be repeated until the air is pushed out of the pipes and the gas has rea
9. door closes easily and S that the door gaskets seal well on all sides Fig 33 20 8 THE ABSORPTION REFRIGERATOR SYSTEM Sealed system construction The sealed system of the absorption refrigerator is constructed of velded steel piping which contains the refrigerant charge The charge consists of ammonia hydrogen and water There are no moving parts associated vith the absorption system CAUTION When servicing an absorption system refrigerator do not puncture orbreak th piping Should a break occur and ammonia contact the skin wash the affected area immediately with clear vater po not attempt to open the valve on the absorber vessel The valve is covered with a plastic cap and should never b removed Cooling Unit 257A gas electric operation for model RM24 without defrosting device Fig M WATER SEPERATOR CONDENSER ABSORBER Cooling Unit 270A VESSEL gas electric operation for model RM36C vithout defrosting device BOILER Fig 35 Cooling Unit 315A gas electrrc operation for model RN47 with defrosting device Cooling Unit 317A gas electric operation for model RM46 without defrosting device Cooling Unit 351A gas electric operation for model RM67 with defrosting device Cooling Unit 352A gas electric operation for model RM66 without defrosting device Cooling Unit 513A gas electric operation for model RM77 with defrosting device Cooling
10. inches 140 rr By adding the tvo together 5 5 5 5 11 inches 280 mm water column For accuracy of measurement a vater U gauge is far superior to a low pressure gauge If a low pressure gauge is used it should be checked for accuracy against a water U gauge occasionally sde Adopter 3 Part No WATER ULF 33 87 59 00 4 GAUGE T Fig 08 Fig 67 Fig 63 LOW PRESSURE GAUGE Low pressure gauge Fischer fig 64 This gauge is calibrated to read in inches of water column pressure It is a standard manometer reading and is colored red How to use the pressure gauge When testing the pressure at the burner remove the plug indicated with an arrow in fig 67 and fit the hose from the pressure gauge Use adapter part No 33 87 59 00 It is very important that the gas operated refrigerators operate at correct pressure i e at the pressure stipulated for the refrigerator Jl OPERATING RECOMMENDATIONS Experience over many years shows that incorrect installation and adjustments are major causes for unsatisfactory refrigeration 40 Unsatisfactory refrigeration also results from improper operation by the user due to misunderstanding or carelessness Each refrigerator contains a pamphlet called INSTRUCTIONS FOR USE which should be followed to assure the best refrigeration results The servicer as well as the user should become thoroughly acquainted with the contents A study of the following instructions
11. incorrectly used Iuproper storage of liquids and moist foods Leaky cabinet scals Infrequent cleaning of food compartment Refrigerator shut off vith closed door Unwrapped odorous food Incomplete contact of thermostat capillary tube Lost thermostat charge Failed refrigerating unit Tie Sri o The correct flame at MAX setting should have a bright bl ecrown at the base of the flame See Fig 79 47 OPERATION ANALYSIS FOR LP GAS REFRIGERATORS Fig 79 SYMPTOM CAUSE Note It will be noted in this tabulation that several causes can be responsible for See paragraph No the one effect The real cause or causes should be determined by a process of elimi nation investigating each possible cause proceeding to the bottom 2 o6 3 3 e a Ki o O 4 amp eb sod M Med Burner flame goes out dor inside cabinet Refrigerator too cold In No adequate ventilation nEEERI I Jet orifice Du a EEEEME T LTIF NAM valve magnet ray sey valve maet OO TL eer aedma fame C d memes fame too mai Ls See m bumer nesd clogged BEE ae 7 3 7 61 3 941 0 Bake ease on o a The thermostat oo used ere BEE E 16 _taeufficiont primary air LL emen lena of tnt semp Unvrapped odorous food ER Incomplete contact of thermostat capillary tube 14 Lost thermostat charge 44 Failed refrigerating unit Et 29 Room temperature too low 51 52
12. made evident by signs of overheating on the vapour pipe leading from the boiler to the condenser the paint on this pipe being blistered and the metal becoming discoloured To remedy this fault it is recommended to remove the unit or refrigerator complete whenever possible and to allow sufficient time to cool down the unit Turn the unit or refrigerator upside down several times so that the liquid in the absorber vessel can be mixed with the liquid in the boiler This procedure will restore the liquid balance to the unit The temperatures on various parts of a unit vary continuously when it is operating on thermostatic control and it is impossible to base a judgment on the symptoms given unless the refrigerator has been operating continuously on fully correct heat input for at least 5 hours and preferably 12 hours prior to examination In many cases this can be arranged by a telephone call to the customer asking him to switch the thermostat to MAX on the day before the inspection call If after 12 hours operation on MAX the performance is satisfactory the unit is not at fault unless the complaint is one of varying or intermittent performance In this connection the room temperature at the time of the complaint must be considered as a unit which is satisfactory at an ambient temperature of 65 F 18 C may not be satisfactory at 95 F 35 C In cases where satisfactory performance is obtained on MAX but not on other settings th
13. making sure that the cross slots engage in the cross on the hinge plate C fig 27 Press the carrier on the opposite side so that the hinge plate on the shutter can be pushed over it See that the crosses engage Turn the spring housings round and up until the small tag A fig 28 snaps into the slot in the lining So aml A BaSS K a Fig 27 Fig 28 18 REPLACEMENT OF EVAPORATOR DOOR GASKET ON RM46 RM47 RM66 RM67 eegene 1 Remove the door as previously described 2 Unscrew the hinge plates A fig 29 3 Put shutter on a flat surface with the sealing gasket up 4 Pry the shutter front avay from the inner pan by means of a screwdriver fig 29 CAUTION It is of great importance that the screwdriver is applied in front of one of the plastic tongues B fig 29 which hold the inner panel and the shutter front together 5 Replace the sealing gasket round the inner panel and snap the inner panel with sealing gasket into the shutter front until the tongues snap in position Fig 29 6 Mount the shutter as described above TO CHANGE THE DOOR FROM RIGHT TO LEFT HAND OPENING AND VICE VERSA DL a With the door closed b c tHeerelwor seal can be adjusted Loosen the front screw amp inge arm and the four To change the door from right to left hand opening and vice versa on models RM36C RM46 RM47 RM66 RM67 1 Unscrew and remove upper hinge bolt A fig 31 incline the d
14. many municipalities this is the law At any rate it takes only a moment with a screwdriver Do this as soon as possible Also as soon as you can have the old unit carted away and destroyed before it attracts a child s curiosity and endangers his life 4 TO CHANGE THE DOOR PANELS on models RM86C RM46 RM47 RM66 RM67 RM76 RM77 Remove the screws holding one side member of the aluminium door frame Pull out the outer door panel re place panel reassemble and refit the door Panel dimensions 9 16 18 1 2 3 16 V8 V8 7 32 3 32 5 32 1 32 5 32 M46 RM47 25 32 27 21 32 y2 3 8 5 32 RM66 RM67 21 32 35 17 32 y2 3 8 5 32 RM76 RM77 11 32 V4 13 16 3 4 18 RM76 RM77 132 15 16 13 16 3 4 18 14 To change the door panel Model RM24 A Remove the top decoration strip 2 with its two screws 1 pull outward on the top of the door panel and lift slightly to free the panel from the bottom groove B If a new panel is being installed assure that it is the same size as the old panel c Install the new panel by inserting one of the vertical sides of the panel into the groove of the door frame 4 D Bend the panel gently so that the free side of the panel can be slipped into corresponding groove of the door frame 5 E Push the panel downwards so that the lower horizontal edge of the panel is fitted in the bottom groove 6 F Between the
15. of the refrigerator and gently pulling the tubes straight out 10 11 12 27 Fig 47 Fig 48 Remove the connection block cover on the side of the boiler case and disconnect the two electrical wires where they join the heater leads in the connection block Remove the grounding screw Remove the flue and the flue baffle Remove the screws B holding the absorption unit onto the back of the refrigerator fig 46 Release the Piezo electrode from burner housing Remove the fastening screw on the burner housing and remove the burner housing from the boiler case Carefully slide absorption unit straight out of the cabinet CAUTION Be careful not to damage the inner liner and the locations of the fastening strips A fig 48 on the evaporator should be noted at this time as they have to be fitted on the new unit To replace absorption unit reverse above procedure CAUTION Be sure to apply sealing permagum B fig 48 on the unit mounting plate Be sure to fit the fastening brackets A on the evaporator coils in the right positions otherwise it will be difficult to refit the 6 fastening screws inside the freezer 11 GAS EQUIPMENT FOR RM24 Item EE Oo 3 O Ov i ow wpe Item NO Description S I T thermo electric flame failure device 91 Lock nut 29 Pressure test connection 23 Housing for test connection 24 Union nut 25 Olive 26 Gas pipe 27 Burner jet 28 Burner pi
16. position in the driving disc A adjust the two fastening screws F of the mechanism Fig 15 Fig 16 13 Combustible Material Storage Combustible material such as ether gasoline hexane naphtha benzine butane propane alcohols acitone benzol lacquer solvent or natural gas SHOULD NOT BE stored in a refrigerator These materials are classified as hazardous and constitute a dangerous application of the refrigerator Keeping sealed system area free of litter Litter including paper or rags woodshavings or other combustible material should not be stored in the area of the absorption system behind the refrigerator Often rags or paper towels etc will be saturated with a combustible cleaning solvent Such materials must not be allowed in the space behind the refrigerator because of the gas flame which is used to power the refrigerator Even when the refrigerator is operated on electricity litter must not be stored in this area because of heat given off by the refrigerating absorption system It is also of utmost importance that the air circulation round the unit s parts behind the cabinet is unrestricted Good refrigeration performance is dependent upon adequate ventilation of the refrigeration unit 3 UNUSED OR ABANDONED REFRIGERATORS An unused or abandoned refrigerator or freezer in your basement or garage poses a hazard to children When you discard a refrigerator or freezer COMPLETELY REMOVE THE DOOR In
17. the inner liner of the cabinet 13 To replace absorption unit reverse above procedure CAUTION 1 Be sure to apply sealing permagum A fig 44 and fig 45 on the unit mounting plate and on the high evaporator inlet tube B 2 Be sure to fit insulation pad C and sealing D only on RM360 3 Be sure to apply proper amount of Thermal Mastic on the evaporator coil E fig 44 and fig 45 4 When fitting the evaporator flange s be sure to tighten the screws properly in order to obtain a perfect contact between the evaporator coil and evaporator flange otherwise improper cabinet performance may result M RM46 RM47 RM66 RM67 Fig 15 26 Fig 46 Replacement of absorption unit on models RM76 RM77 When replacing the absorption unit it will be necessary to remove the refrigerator from its recess paragraph 10 1 2 Remove the 6 screws at the bottom of the freezer compartment A fig 47 Remove the thermostat capillary tubes by loosening the two screws B on the evaporator fins fig 47 CAUTION The locations of the thermostat capillary tubes should be noted at this time for relocation later on The tubes must be replaced in the right position otherwise improper performance may result Remove the two sealing plugs for capillary tubes one on the back and one in side the cabinet and straighten the tubes out Remove the capillary tubes by going to the back
18. upper edge of the panel and the door frame there is now a gap which should be covered by the decoration strip G Put the strip across the door so that the gap is covered and push it up wards 7 The tabs on the inside of the strip should fit in behind the flange of the door frame H When put in place secure the deco ration strip by means of the two screws 1 The panel is then locked in proper position D REPLACEMENT OF DOOR GASKET ON RM24 The construction of the door complete is an aluminium extruded door frame foamed in place with the door pan and magnetic door gasket i e the door pan cannot be removed Therefore a special door sealing gasket for service purposes has been produced for the above model The gasket is delivered in a set consisting of the gasket and of necessary fastening strips and screws and is ordered under part No 290 07 33 00 3 The replacement is made as follows 1 Remove the door and place it with its front downwards on a soft surface 2 Cut off the defective door sealing gasket Cut as near to the door pan as possible 3 Drill 7 64 holes for the screws of the fastening strips Use the holes of the door pan as pattern 4 Fit the sealing gasket as shown in the figure 21 5 Fit the door and adjust it so that it seals properly Fig 21 16 Replacement of door gasket on models RM36C RM46 RM47 RM66 RM67 RM76 RM77 1 Remove the door shelves 2 Unscrew
19. will help the servicer to better instruct the user and will also help him to answer questions which may be asked 22 STARTING THE REFRIGERATOR RM24 The gas and electric controls are located at the rear of the refrigerator and are accessible through the service door in the wall of the vehicle The gas shut off valve and the electric voltage change switch are interlocked so that both methods of operation cannot be inadvertently used at the same time 23 GAS OPERATION See Fig 70 and 71 1 Ensure that the voltage change switch A is at the OFF position 2 Turn the gas valve C so that the handle is in line with the valve body and turn the gas thermostat dial B to No 4 setting 3 Push in the blue button D of the flame failure device for 5 10 seconds to clear air from pipe line 4 Still pressing in the button D twist the knob of the flint lighter G sharply in a clockwise direction 5 Continue pressing in the blue button D for another 5 seconds then release it and check that the burner is alight by looking at the flame through the opening F 6 If the burner has not lit the thermostat dial B must first be turned to MAX and returned to its normal setting only after the burner is alight 110v CONNECTION Ger CORD c D To 12V automobile H battery Fig 70 Fig 7I 24 ELECTRIC OPE RATION See Fig 70 The RM24 refrigerator can be operated on 12 volts D C or 110 volts A C provided the voltage
20. 48 PERIODIC MAINTENANCE Once or twice a year depending on use it is recommended to clean and ad just the burner assembly Proceed as follows 1 Disconnect the gas pipe from the burner assembly 2 Bemove the burner housing 3 Remove the jet 4 Clean the jet with alcohol and compressed air ONLY 5 Clean the burner tube and especially the gauze with a brush Blow with compressed air 6 At the same time check the flue baffle that it is clean and free from soot Heavy soot formation indicates improper functioning of the burner Clean baffle and flue Further clean cooling unit and floor under refrigerator 7 Reassemble 8 The entire gas installation should be checked for leaks at intervals Test all pipe connections with soapy water not with an open flame 9 Check the burner with full flame MAX and with by pass flame 0 Note The thermostat will not close to by pass on setting O unless the refrigerator has been workin for a few hours and the thermostat bulb is cooled down to at least 6 C 40 Fj
21. E BEST PERFORMANCE Kit No 1 RM24 UPPER VENT comprising OPENING Upper side vent Dometic 123 Lower side vent Dometic 183 see Fig 4 LOWER VENT OPENING MINIMUM VENTILATIOX HEIGHT Kit No 2 RM36C comprising Upper side vent Dometic RM122 Lover side vent Dometic RM2217 see Fig 5 Kit No 3 RM36C RM46 RM47 RM66 RM67 RM76 RM77 comprising Roof vent Dometic V 2019 Lover side vent Dometic RM2217 see Fig 6 Dimensions pertaining to the installation are shown under measurements VENTING MEANS Fig 1 Roof vent for Kit No 3 Dometic V 2019 le 9 een ag 2 2 La L Cutout size 21 232 Fig 8 Upper side vent Kit No 2 Dometic RM122 Cutout size 10 14 UPPER SIDE VENT OPTION OPENING LOWER VENT OPENING MINIMUM VENTILATION HEIGHT ROOF VENT OPENING LOWER VENT MINIMUM VENTILATION HEIGHT 18 Joe Cutout size 16 3 Lover vent Kits No 2 andNo 3 Dometic RM2217 10 MEASUREMENTS Cabinet and recess dimensions in inches Cabinet Refrigerator Overall dimensons models RM24 19 1 4 RM36C 20 1 4 RM46 RM47 21 7 8 RM66 RM67 21 7 8 RM76 RM77 23 13 16 Cabinet and recess dimensions in mm Cabinet Overall dimen Door pro jection Built in space recuired Refrigerator ions models 24 36C 46
22. HiDometic SERVICE United States SALES OFFICES DOMETIC SALES CORP Zone 2320 Industrial Parkway Elkhart IN 46515 28 295 5226 DOMETIC SALES CORP Zone Il 2920 Avenue E East Arlington TX 76011 1 7 649 5726 DOMETIC SALES CORP Zone Il 14441 Bonelli St City of Industry CA 91746 88 968431 Canada DOMETIC DISTRIBUTION INC 866 Langs Drive Cambridge Ontario N3H 2N7 Canada 59 62 439 Edition Publication No 4528 E Service May 1973 DSC 648 ae ma t il S E cA BT icd Am NEP wc Ch heath SRL ft IER Wer ond T e f sth AMO ees ene gt REFRIGERATOR for recrea tional vehicles RM24A RM36C RM46 RM47 RM66 RM67 RM76 RM771 SERVICE MANUAL When ordering SPARE PARTS always state MODEL QUANTITY PART NUMBER DESCRIPTION For electric details also VOLTAGE WATTAGE I The absorption refrigerators described in this manua in recreational vehicles Since the vehicles n Service Instructions for Domtic Absorption Refrigerators are primarily for installation whih the refrigerate s are located may be drive to remote camp sites where electrical power is not available the refrigerator5 have been debignbdocd dpbrate Wy imeapa ne or electricity 12 110V These Service Instructions cowe butane gas as wellas b y the Dometic M odels RM 24 RM36C RM 46 RM47 RM66 RM67 RM76 RM77 LIST OF CON
23. RM47 66 RM67 76 RM77 Built in space Cabinet overall dimensions requirements Fig 10 Fig 11 Grounding It is imperative for personal safety that all refrigerators equipped with a three prong Grounding plug be used only with properly grounded wall receptacles See fig 12 If there is any doubt as to whether the wall receptacle is properly grounded the customer should have it checked by a qualified elec trician DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE THIRD GROUND PRONG FROM THE POWER CORD PLUG Proper fusing Fusing of any circuit should be in accordance with local electrical code The refrigerator should be plugged into a separate branch circuit Use of extension cords should be avoided on refrigeration equipment In the Fig 12 event an extension cord is used the cord should not exceed six feet and be of sixteen gauge or heavier wire Gas line L P gas is highly inflammable and it is of extreme importance to ensure that all joints in piping carrying the gas from the storage bottle to the burner on the refrigerator are and will remain absolutely gas tight Check at least twice a year The gas line should be free of kinks and sharp ends After installation the gas should be turned on and all joints in the gas line checked for leaks up to the burner using soapy water This check should be repeated periodically Do not fit any extension to the top of the flue This
24. TENTS Description ECHNIGU FEATURES Cabine es equipment E INSTALLATION INSTRUCTIONS General instructions Ventilation ww eee Gas connections connections Electrical Approved installations Measure ments Cabinet Adjust ments To change the door panel Replacement of door gasket J Replacement of evaporator door and gasket Reversing outer door s ese THE ABSORPTIONREFRIGRATOR SYSTE M Cooling unit replacemeh GAS ELECTRIC EQUIPMENT Gas equipment for RM24 Dual electric equipment for RM24 Car electric equ ipmentfor RM36C RM 46 RM47 RM66 RM67 RM76 RM 77 __ AS OPERATION FUNCTIO NAL PARTS Termostat replacment The gas burner sss sseesee nnn Flue system Thermo flame failure devie 10 13 15 16 18 20 22 23 28 29 30 32 33 34 35 Description ELECTRIC OPERATION FUNCTIONAL PARTS Replace menwf heater Wiring dia gr AMS een PRESSURE MEASURING DEVICES OPERATING RECOMMENDA TIONS Gas operation Electric operation lesse MAINTENANCE Levelling cece ec ee eee Temperature Control thermostat The themostat capillary tube Storing food in the refrigerator Cleaning Ice cubes Travel latch Door seal Odors insid the refrigerator Odors from fumes Flame blow out
25. a relay mounted either in the car or in the vehicle see diagram This realy will au tomaticallycut out the refrigeratorwhen the car motor is stopped Fig 1 The figures below are guiding valuer calculated in consideration of 0 5 V voltage drop about 7 input loss in the connection cables without taking into account the losses at the terminals Maximum length of two conductor cable in feet from AWG in mm power supply solid cooper wire 28 21 17 15 11 Maximum length of two conductor cable in meter from power supply Special hints The refrigerator must be installed in a sub stantial enclosure and must be level A spirit Level is supplied with each refriger ator and by placing it in the freezer com partment the refrigerator can be leveled both ways front to back and side to side When installing the refrigerator in the enclosure care should be taken to ensure a complete sealing between the front frame of the refrigerator and the top sides and bottom of the enclosure For this purpose a length of sealing strip is delivered with each refrigerator The sealing strips should be applied to the rear surfaces of the front frame of the refrigerator See fig 2 RM24 is supplied with this sealing already fitted on the front frame of the refriger ator Be careful not to damage the sealing strip applied to the bottom of the enclosure when the refrigerator is put in place Any space between the counter or storage area a
26. aced 1 Release the lighter as described above 2 Unscrew the rod from the serrated wheel and fit a new wheel CAUTION The rod has to be unscrewed anti clockwise Fig 77 41 PIEZO LIGHTER Fig 77 The RM36C RM46 RM47 RM66 RM67 RM76 and RM77 models are equipped with a Piero crystal lighting device vhich creates a spark over the burner when the button E is pushed in fully see fig 72 46 The Piezo lighter does not normally need any maintenance If by any reason the electrode or the lighter must be replaced proceed as follows Replacement of electrode only 1 2 Unscrew burner outer shield Loosen fastening screw A Fig 78 holding the electrode against side of burner housing Loosen the electrode from its cable by unscrewing the electrode anti clockwise Pit a new electrode CAUTION When fastening the electrode on the burner housing make sure that the insulation plate is properly fitted between the burner housing and the electrode see fig 78 Replacement of Piezo lighter complete 1 Release the Piezo lighter knob E see fig 72 inside the cabinet by means of pulling the knob outwards Loosen outer burner shield and burner housing Loosen the fastening screw A Fig 78 holding the electrode against side of burner housing Loosen the two screws B on holder C Now the lighter complete can be pulled out at the rear of the cabinet To fit new lighter reverse above pr
27. ase the capillary clamp by removing the plastic rivet B and straighten the thermostat capillary tubes 7 Remove the plastic cover C by means of pulling it towards the right hand side which will release it from the evaporator window 8 Remove the refrigerator from its recess and place its front downwards on i soft surf ace 9 Pull out the capillary tubes 10 Loosen mount screws A holding the blow out kit Fig 40 11 Remove the heater see Fig 13 12 Remove mount screws B holding the unit 13 Loosen screws C holding the bracket for the gas el equipment and the screws D holding the burner housing and remove the gas equipment 14 To replace unit reverse above procedure Fig 39 Fig 40 24 COOLING UN IT REPLACEMENT RM36C RM46 RM47 RM66 RM67 Remove the refrigerator from its recess as follows 1 Check that refrigerator is empty and remove ice tray 2 Turn off gas bottle 3 Disconnect gas line to inlet valve CAUTION Use a backup wrench to prevent undue rotation 4 Unplug the electric line from the trailer outlet 5 Remove the 4 screws in rear front f fame 6 Check for any additional screws which the vehicle manufacturer may have used to fasten the refrigerator in place 7 Carefully slide the refrigerator straight out of its recess To remove the cooling unit from the cabinet proceed as follows 1 Place the refrigerator on a work be
28. ass screw Gas thermostat LO Knob for fuel selector 11 Pressure test gage connection 12 Gas filter 13 Plugs for capillary tubes 14 Capillary tube for gas thermostat 15 Shut off valve 16 Push button for lighter 17 Piezo lighter 18 Lighter electrode 19 Knob for releasing safety device 20 Knob for gas thermostat 21 Fuel selector LP gas l10 Volts A C o co 3 O Cn BWM pa ELECTRIC EQUIPMENT PARTS 22 Flexible cord with moulded plug 23 Junction box 24 Electric thermostat 25 Knob for electric thermostat 26 Toggle switch 110 Volts operation 27 Heater 28 Capillary tube for electric thermostat 12 VOLTS OPERATION 29 Terminal block 30 Fuse 31 Fuel selector LP gas 110 Volts A C 12 Volts D C 32 Change over switch 110 Volts A C 12 Volts D C 31 NS NN e Ld e Le ms sm e Fig 51 32 14 THE GAS THERMOSTAT V 35 The gas thermostat V 35 consists of three main parts Be 1 lows sys tem Mechanism R Gas inlet Valve housing Bellows system Valve housing see fig 52 and fig 53 f l Valve p forms rod PASS SCREW 3 a om ia BY PASS Dial shoft SENSING TUBE AN Z COLD ADJUSTMENT E t 3 i 1 SPRING SCREW 1 f Mcchbnism housin Gas outlet Leve g Fig 53 Cleaning valve or valve seat in the V 35 thermostat Dirt on the thermostat gas valve or seat prevents the thermostat valve from cor pletely closing conseq
29. ched the burner ELECTRIC OPERATION Fig 72 Check that the attachment plug of the flexible cord is correctly connected co the main supply The 12 volt connection is made at the marked terminals at the rear of the refrigerator Turn the knob A to off position then press the knob in to bottom and turn to desired electric position 42 3 Turn the thermostat knob G to setting 4 Note When the refrigerator is equipped for 110 volts and 12 volt operation the turning movement of the knob A should be made as follows In gas OFF position the knob is pressed and turned clockwise to the 12 volt position If 110 volt operation is desired press once more and continue the clockwise turning to the 110 volt position marked ELEC 28 LEVELING In the boiler of the cooling unit ammonia vapor is distilled from an ammonia water mixture and carried to the finned condenser where it liquefies The liquid f lows to the evaporator inside the cabinet where it creates cold by evaporating into a circulating flow of hydrogen gas If the evaporator is not level the liquid readily accumulates forming pockets which can impair the gas circulation or block it com pletely in which case of course cooling will stop When the vehicle is stationary it must be leveled to be comfortable to live in If the refrigerator is properly installed i e the ice tray compartment shelf is parallel with the floor the refrigerator will operate properly To check this a
30. d pull it through the cabinet Remove the thermostat by mscrewing it from the gas filter and the flame failure safety device NOTE Always shut off the gas supply before removing any gas part from the refrigerator By pass screw sizes and part No Mode 1 By pass screw e SN RM24 13 14 3 7 RM36C 19 02 1 RM46 RM47 19 02 1 RM66 RM6 7 19 02 1 RM76 RM77 19 02 1 Thermo couple Feelerplaced1 8 into flame 15 THE GAS BURNER see fig 55 Boiler tube The burner has the jet horizontally located and the burner mixing tube is formed as a bend with vertical outlet The primary air inlets are pre set and therefore not adjustable The burner and the burner holder are made in one piece Burner The burner is provided with the thermo electric failure safety device and the i thermocouple tip is pre set Fig 55 To check for a correct flame set thermostat to AX Flame should have a bright blue crown at the base of the flame Burner jet sizes and input BTU h RM24 00 39 10 6 289 00 35 10 6 RM36C 26 60 15 3 200 26 60 16 1 RM46 RM47 26 60 16 1 200 26 60 17 9 RM66 RM67 26 60 17 9 200 36 60 18 7 RM76 RM77 26 60 17 9 200 26 60 19 5 34 16 TEE FLUE SYSTEM The flue system consists of the following parts 1 Central tube built in part of the boiler system and cannot be removed 2 Flue 3 Flue baffle with support wire The purpose of the flue system is to provide a draft which will pull the b
31. e boiler due to dislocation of the burner Relocate Burner dislocation may also cause smoke and discolouring of walls and ceiling 4 Burner damaged Replace 5 The flame touches flue baffle Correct position of baffle 6 The flue tube is dirty Clean the flue 39 FLAME BLOWS OUT If trouble is encountered with the flame blowing out under specially windy con ditions try to place the vehicle so that the wind does not blow directly into the vent outlets If the trouble persists set the thermostat on MAX This latter measure can of course only be temporary such as when the vehicle is on tow for after several hours at this setting the foodstuffs in the cabinet may become too cold 40 THE FLINT LIGHTER RM24 If after some time of use the sparks from the lighter weaken the flint will probably have to be replaced 45 Fig 76 To replace flint follov these steps 1 Remove the outer burner shield by means of loosening the two screws A Fig 75 2 Remove the lighter by loosening the screw B retaining the lighter Fig 70 3 Remove cap C and remove the spring D and tap out any remaining piece of flint and fit a nev flint Be sure not to lose the small helical spring vhich presses the flint against the serrated wheel Replacement of the serrated vheel RM24 If after several years of use the lighter does not function properly even witna new flint the serrated vheel might be worn out and needs to be repl
32. e intact 45 PACKING OF DEFECTIVE UNITS Particular attention must be paid to the packing of a replaced defective unit to en sure during its return to the distributor that it will not be damaged in transit When the replacement unit is supplied cased careful note should be taken of the manner in which it is packed to ensure that the form of packing adopted i e the use of wood bracing and cardboard pads is used when the defective unit is packed into the case Structural distortion particularly with the smaller units not having an angle iron frame can easily occur if the case containing the unit is roughly handled and if internal braces are not in position 50 46 OPERATION ANALYSIS FOR REFRIGI S X PTOM de cabinet insi Kerrigerator to cold Frost forms rapidly E o ont A ki H o9 to sei A Mi 9 M o z Odour See paragraph No ERATORS OPERATING ON ELECTRICITY CAUS tz Note It will be noted in this tabulation that several causes can be responsible for the one effect The real cause or causes should bc determined by a process of elini nation investigating each possible cause starting at the top of the tabulation and proceeding to the bottan Not adequate ventilation Refrigerating unit not level Heater faulty wrong voltage or type Voltage not constant Electric connections loose Heater not inserted correctly in its pocket Improper food storage The thernostat
33. e thermostat is to be suspected When a normal unit is working on MAX the absorber coil will be warmer at the bottom than it is at the top The absorber vessel will be warmer The vapour cooling pipe from the boiler to the condenser will be warm bearably to the hand at the bend where it joins the condenser with a gradual rise in temperature towards the boiler end Unit filling valve The needle valve used for admitting the filling charge to a cooling unit is fitted to the unit s absorber vessel and is covered by an aluminium or plastic cap It is strictly applied provision of the warranty extended on the unit to the customer that any interference with the filling valve will automatically void the warranty Unsatisfactory unit performance due to an ammonia leak can be determined in the case of a visible leak by traces of a yellow deposit at the point where the ammonia is escaping If there is a leak on the evaporator inside the cabinet a smell of ammonia may be noticeable 23 10 COOLING UNIT REPLACEMENT RM24 If it is necessary to replace the cooling unit proceed as follows 1 Turn off the gas b ttle 2 Disconnect gas line to inlet valve CAUTION Use a back up wrench to prevent undue rotation 3 Unplug the electric line 4 Check that refrigerator is empty and remove ice tray 5 Remove the evaporator cover with its flap A by means of pulling it outwards which will release it from the evaporator See Fig 39 6 Rele
34. eration is located at the rear of the cabinet and manipulated from inside the cabinet The gas shut off valve and the electric voltage change switch are interlocked so that both methods of operation cannot be inadvertently used at the same time The electric and gas thermostats are of the Ranco make Version All models will be available with combination equipments for LP gas and 110 volts A C or LP gas 110 volts A C and 12 volts D C 2 INSTALLATION INSTRUCTIONS For LP gas and electric operation in Motor Homes and Recreational Vehicles General instructions The refrigerators outlined herein have been design certified under ANS 221 19 Refrigerators by the American Gas Association for installation in a mobile home or recreational vehicle and are approved by the Canadian Gas Association The certifications are however contingent on the installation being made in accordance with the following instructions The installation must conform with In U S A 1 Installation of Gas Appliance and Gas Piping 221 30 1964 2 Mobile Homes A119 1 1969 3 Recreational Vehicles A 119 2 1970 The unit must be electrically grounded in accordance with the National Electrical Code ANSI CI 1968 when installed if an external alternating current electrical source is utilized 4 Any applicable local code In Canada 1 C S A Standard B 149 Installation Code for Gas Burning Appliances and Equipment 2 CS A Standard B 210 1 Z 240
35. fresh food evaporator is a sleeve in which the end of the thermosta capillary tubing must be inserted Check that the capillary tube is firmly in place If the capillary tube is not properly inserted in its sleeve see Fig 74 the burner will operate continuously at maximum flame us It will cause too low cabinet temperatures Fig 7 43 31 STORING FOOD IN THE REFRIGERATOR 1 Proper refrigeration requires free air circulation within the food storage com partment Restricted air circulation within the food storage compartment will cause higher cabinet temperatures Rearrange foods 2 It is also essential that the shelves are not covered with paper or large storage containers 3 Odorous foods or highly flavored foods should always be stored in covered dishes plastic bags or wrapped in foil or wax paper to prevent food odors Vegetables lettuce etc should be covered to retain their crispness Never put hot food into the refrigerator 4 To reduce frost formation in and on the freezing compartment cover stored liquids and moist foods and do not leave the door open longer than necessary 5 When the refrigerator is heavily loaded it takes longer for refrigerator tem peratures to lower also increasing the ice making time A very heavy load may also cause defrosting 32 CLEANING The cabinet interior should be cleaned regularly Remove the shelves and wash the lining with lukewarm water to which a little baking soda
36. gh with air If necessary replace by pass screw Clean burner jet with alcohol and by blowing through with air If necessary replace burner jet Clean the head with a brush Position of baffle see table on page 34 Position of baffle see table on page 34 Have pressure checked Pressure must not fall below 11 280 mm water columns when thermostat is set on max Refit burner Turn the thermostat dial to a higher number If necessary replace thermostat See par 44 Turn the thermostat dial to a lower number Re insert end of capillary tube in the clamp on the fresh food compartment See par 30 Replace by pass screw to correct size see table page 33 Clean the valve and valve seat in the thermostat see par 14 49 44 _ FAILED REFRIGERATING UNIT There are many things to consider before determining that the unit is faulty 1 Leveling of the refrigerator 2 Ventilation 3 Cleaning and proper size of burner orifice 4 Cleaning and proper size of by pass screw 5 Cleaning of thermos tat valve 6 Proper gas pressure 7 Correct flame 8 Correct position of baffle in boiler tube 9 No burnt out heating element 10 Heating element in correct position 11 Correct size and vattage of heating element 12 Supply voltage corresponds to voltage stamped on heating element 13 No fluctuation in voltage supply 14 No loose electric connections 15 Thermostat intact 16 No unit leaks 17 Safety valv
37. higher cabinet temperatures Flue stoppages may also cause the flame to burn outside the central tube 35 1 THERMOELECTRIC FLAME FAILURE SAFETY DEVICE see fig 58 All models equipped with an automatic failure device All gas operated or combined gas electric refrigerator models dealt with in this service instruction are equipped with an automatic failure device The purpose of incorporating an automatic flame failure device in the burner assem bly is to prevent unburned gas to escape from the burner and to avoid a fire hazard if for some reason or other the flame has been extinguished or blown out The safety device consists of the following parts Spring loaded push button Gas valve Housing Sensing clement with the hot junction of the thermocoup le Feeler Enamel insulated copper thread Electromagnet Outer tube Armature Spring GEET EEEER The Chevwgoelectric safety device functions as follows By pressing the push button 1 the gas valve 2 is opened and the gas can pass the housing 3 on to the burrzr At the burner the feeler 4 is located When the gas flame of the burner is lit some heat is transferred to the feeler 4 The hot junction of the thermocouple is thus heated and an electric current is generated This current passes through the copper wire 5 to the electromagnet 6 and back through the outer tube 7 As soon as the electric current is generated the electromagnet attracts the arma
38. is not only unnecessary but can create draught conditions which can adversely affect correct combustion at the burner and consequently the functioning of the cooling unit The refrigerator should be operated at an inlet gas pressure of 11 WG 280 m W G Incoming gas pressure is controlled by the pressure regulator on the propane butane bottle CAUTION When connecting the gas line to the gas cock on the gas el equipment at the rear of the refrigerator use a back up wrench to prevent undue rotation of the gas cock It is of utmost importance for correct functioning of the gas el control on RM86C RM46 RM47 RM66 RM67 and RM76 RM77 that the gas cock lever is correctly engaged in the slot E see Fig 16 on the plastic driving disc A of the gas el control mechanism 12 If for anyreasonthe gas cock lever has come off position in the driving plastic disc check alignment Proceed as follows 1 Turn downwards the driving plastic disc A to stop BP see fig 13 2 Turn downwards the lever C of the gas cock as far as possible fig 13 3 Pull the driving disc A outwards fig 14 Fig 13 Fig 14 4 Turn the lever C of the gas cock into vertical position D see fig 15 3 Release the driving disc which is then pulled inwards by spring action whereby the lever of the gas cock snaps into its slot E on the driving disc A fig 16 iiote If the gas cock lever sluggishly snapsinto its
39. may be added Dry thoroughly especially around door frames and door gasket Warm water only should be used to wash the cooling evaporator ice trays and shelves Plastic dishes may be washed in warm soapy water not hotter than is bearable to the hand Do not expose them to dry heat Never use strong chemicals or abrasive cleaning materials on any part of the cabinet 33 ICE CUBES 1 Do not use warm water as it takes longer to freeze 2 Faster freezing will result if precooled water is used 34 TRAVEL LATCH The travel latch may be fitted to hold the door closed while in transit 35 TO SHUT OFF THE CABINET If for any reason refrigeration is not required over a period of weeks the gas taps or electric switch should be turned off The cabinet and ice trays should be emptied cleaned and dried and the door left ajar 36 DOOR SEAL 1 It is essential for correct operation that the door gasket makes a good seal all around against the front of the cabinet The compression of the gasket down the hinge side must not be too great The gasket should just contact the front of the cabinet when the door is closed This is normally allowed for during manufacturing 44 Failure of the door gasket to contact the front of the cabinet can be determined visually when the door is closed Run a piece of thin cardboard along tne door seal inserted between the seal and the cabinet front Nowhere should the card board feel loose 2
40. more nor less than 11 inches water gage Electrical connections 110 V A C The 110 V electric cord should be plugged into an approved receptacle in the refrigerator compartment The cord should be routed to avoid coming in contact witn the burner cover flue cover or other hot components 12 V D C On Tri Power units there is an additional terminal block marked 12 V The refri gerator must be connected to the battery circuit with two wires of adequate capacity to avoid voltage drop Do not use the body or chassis as a substitute for either of these wires possibly only in motor homes No other electrical equipment or lighting should be connected to the refrigerator circuit When estimating length and area of conductor cable see table page 6 CAUTION Do not operate the refrigerator on 12 Volt when the vehicle is parked You will run the battery dead 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 car or in the vehicle see diagram This relay will automatically cut out the refrigerator when the car motor is stopped Pr ee ge 1 SWITCH KEY BREAKER IGNITION Bi POINT REFR CAUTION Do not operate therefrigerator on 12 Volt when the vehicle isparked You will run out of battery in a rather short time If possible the installation of a 12Volt ope rated refrigator should be completedwith
41. nch of suitable height 2 Remove the thermostat capillary tubes by loosening the two screws A on the evaporator fins Fig 41 and fig 42 CAUTION The locations of the thermostat capillary tubes should be noted at this time for relocation later on The tubes must be placed in the right position otherwise improper performance may result 3 Remove the two sealing plugs for capillary tubes one on the back and one inside the cabinet and straighten the tubes 4 Remove the capillary tubes by going to the back of the refrigerator and gently pulling the tubes straight out 5 Remove the 4 screws B and take away the evaporator fins C On RM46 RM47 and RM66 RM67 6 screws and 2 screws in the freezer compartment 6 Remove the plastic cover A Fig 43 by means of pulling it upwards on the right hand side which will release it from the cabinet liner only on RM360 Fig 43 25 Remove the connection block cover on the side of the boiler case and disconnect 7 the two electrical wires where they join the heater leads in the connection block 8 Remove the grounding screws A see Fig 46 on the lower part of the boiler case 9 Remove the flue and the flue baffle 10 Remove the screws B see Fig 46 holding the absorption unit onto the back of the cabinet 11 Release the piezo electrode 12 Carefully slide absorption unit out of cabinet Be careful not to damage
42. nd the top of the refrigerator must be blocked The heat produced at the rear of the refrigerator will otherwise become trapped in this space making the top of the refrigerator hot and reducing the efficiency of the refrigerator Approved installations Fig 2 Approved installations require one roof vent and one lower side vent as optional one upper side vent and one lower side vent as shown in the figures 4 5 and 6 Kit No 1 comprising Upper side vent Dometic 123 Lower side vent Dometic 183 Kit No 2 comprising Upper side vent Dometic RMI22 Lower side vent Dometic RM2217 Kit No 3 comprising Roof vent Dometic V 2019 Lower side vent Dometic RM2217 When installing the refrigerators full consideration should be taken to the sealing instructions and the specified minimum clearances and ventilation heights tabled below MINIMUM INSTALLATION CLEARANCES IN INCHES Refrigerator model RM24 RM36C RM4E RM66 RM76 RH41 RM67 RM77 Clearances on sides top and bottom Clearance A from l Figure showing the the rear of storage 4 4 4 5 location of the compartment clearances Clearance C on top of See minimum ventilation condenser height figures Clearance B from rear of condenser MINIMUM VENTILATION HEIGHT FIGURES Refrigerator Installation type model Kit No 1 Kit No 3 22 9 16 37 1 16 39 5 8 47 1 2 70 1 4 PROPER VENTING IS REQUIRED TO ENSUR
43. ocedure Electrode Burner housing insulating plate Fig 78 47 42 TROUBLE SHOOTING ELECTRIC OPERATED REFRIGERATORS a b c d e f g h i j k 1 m a b c d Cause Remedy The refrigerator des not cool satisfactorily Thennoatat at wrong setting Air circulation over cooling unit restricted Refrigerator not level Air leakage into cabinet Evaporator heavily coated with frost Heater faulty wrong voltage or type Intermittent electricity supply Drop in supply voltage Thermostat at too low setting Break in electrical circuit Heater faulty open circuit Thermostat faulty Failed cooling unit The refrigerator is too cold Thermostat at wrong setting End of thermostat capillary tube incorrectly located Thermostat faulty Heater wrongly connected to terminal block Turn the thermostat dial to a higher number Remove any restriction The refrigerator must be level in both direc tions to operate properly If in a trailer always make sure it is level when parked See par 28 Check fit of door gasket and that the seal ing plug is in the hole for the thermostat capillary in the rear wall of cabinet See par 36 Defrost at more frequent intervals Use a new heater of appropriate voltage see table page 37 Look for loose connections or other reason for interruption and correct The supply voltage sho
44. of electric gas interlock system Thermo electric flame failure device Flint lighting system The electric and the gas thermostats are of the English Ranco make The gas el controls are located at the rear of the refrigerator and are acccssiole through the service door in the wall when installed in a vehicle Version Gas 110 volts A C and 12 volts D C RM36C RM46 RM47 RM66 RM67 RM76 RI 177 Cabinet Thin wall polyurethane insulation All models except RM76 and RM77 have foamed in place insulation RM76 and RM77 are foamed against mould Lining of vacuum foamed ABS plastic except RM36C which has a lining of injection moulded SB plastic Distinct stop for evaporator door at 90 opening RM46 RM47 RM66 and RM67 Cabinet shelf with hinge for big bottles The shelves run in grooves and will not move during transport of the vehicle Freezer compartments are of aluminiurn sheet except RM36C where it is an injectior moulded part of the lining Accessible control panel inside the fresh food compartment Door All models will be delivered with right hand door hinging but it is possible for the customer to change the door hinging from right to left hand Replacement of door panel is possible without removing the door Only the side profile of the door frame has to be removed Equipment All models incorporate a thermo electric flame failure safety device and a piezo lighting system The equipment for electric and gas op
45. oor outwards and lift off the door Check that washer and nylon bushings are in the right positions 2 Move the lower hinge bolt B to the opposite side Fig 31 Fig 32 3 Remove the plastic travel latch A fig 32 by means of turning it towards the cabinet opening and slide it out from its slot in the hinge plate B Turn the travel latch the opposite way and fit it on the hinge plate on the other side of the cabinet When the travel latch is in locked position the fluted side of the latch should face the cabinet opening 4 Refit the door and the upper hinge bolt CAUTION Check that the door closes easily and that the door gasket seals well on all sides If necessary adjust by resetting the top hinge To change the door from right to left hand opening and vice versa on RM76RMT77 1 Unscrew and remove the upper hinge bolt A MERE ER on the freezer door incline the door out GC SC wards and lift off the door fig 33 rm 2 Remove the middle hinge bolt B and lift off EE B the cabinet door MEE 3 Move the lower hinge bolt C to the opposite E oso KR side TEN n H CS 4 Unscrew the middle hinge D and the holder M with travel latch E and change their pS positions to opposite side x x 5 Refit the cabinet door and the middle hinge SCH i bolt i he d i 6 Refit the freezer door and the upper hinge PE TI C bolt S EB X 8 E D SC 3 CAUTION Check that the
46. pe 29 Filter with nipple amp nut 30 Thermostat Ranco V35 31 By pass screw 32 Thermos tat knob 33 Screw 34 Indicator 35 Thermo coup le 36 Lock nut 37 Washer 38 Distance tube Distance nut 39 40 41 35 Description Screw Gas cock Flint lighter compl Flint Spring Screw Screw Screw Screw Washer Spire speed nut Screw Baffle Baffle support wire Screw Viewing glass Window Seal for viewer and flint lighter Metal shield Washer Screw 12 DUAL EL ECTRIC Item Description No Heater 12 110V 95W TYPI EQUIPMENT 12 110V FOR E 173 Terminal block Cable clamp Thermostat knob Terminal block cover Screw Spire speed nut Switch cover Screw Gas cock with bracket Screw Protection tube Thermostat Ranco A50 Nut Thermostat cover Screw Plastic rivet Capillary clamp Grommet Screw Clip Switch knob with dial CODD OW WHF OS oco a O OA a W Po ta M5 BO PO DoF c5 o 33 Item RM24 Description Dial Screw Nut Washer Switch Cable clamp Screw Indicator Thermostat bracket Screw Fastening plate Insulation Screw Terminal block Screw Insulation Fuse 10A 29 30 13 GAS ELECTRIC EQUIPMENT 12 110V FOR RM36C RM46 RM47 RM66 RM67 RM76 RM77 See Fig 51 GAS EQUIPMENT PARTS Flue baffle Blow out protection Burner tube Burner housing Burner jet Feeler point Flame failure safety device By p
47. the upper hinge bolt incline the door outwards and lift off the door CAUTION Be sure to protect door panel to prevent scratches and dents 4 The screws holding the door pan in place are NSI hidden by the door gasket Pull the door gasket to one side and remove all screws A see fig 24 from the door plate 3 Lay door on flat surface with door pan facing up 6 REPLACEMENT OF EVAPORATOR DOOR ON RM36C Unscrew the retainer fig 25 and remove the door REPLACEMENT OF EVAPORATOR DOOR CASKET RM36C 1 Put evaporator door on a flat surface vith the sealing gasket up 2 Pry the door front away from the inner pan by means of a screwdriver fig 26 17 CAUTION It is of great importance that the screwdriver is applied in front of one of the plastic tongues which hold the inner panel and the door front together Replace the sealing gasket round the inner panel and snap the inner panel and the door front together Mount the evaporator door and refit its retainer _ Retainer Fig 25 Fig 26 REPLACEMENT OF EVAPORATOR DOOR ON RM46 RM47 RM66 RM67 1 Push the carrier A inwards by means of a blunt mandrel or pin fig 27 and remove the shutter Pry the spring housings B fig 27 away from the lining so that it snaps out and turn the spring housings downwards 180 fig 28 Mount the new shutter in close position first on one side
48. ture 8 with the valve 2 The push button can t en be released As long as current is flowing the val eis kept open and allows gas to pass co the burner When the flame is extinguished the heat transfer to the hot junction is interrupted and no electric current is generated The armature 8 with the valve 2 is then forced back by the spring 9 and the gas flow through the valve 2 is closed Important When lighting the burner the push button 1 should be pressed f irrivanc held in that position about 10 seconds otherwise the gas may not get to the burner properly 36 REPLACEMENT OF THE THERMO ELEMENT OF THE THERMOELECTRIC FLAME FAILURE SAFETY DEVICE How replace the thermo element of the thermoelectric flame failure safety device see fig 59 1 Unscrew plug A f rom the valve housing B 2 Loosen the position nut C and lock nut D 3 Screw off nut C remove spacer G and nut D Release the thcrmo element E from burner housing F 4 Bend carefully the new thermo element to the same shape as the old one Screw nut D into the new element 5 Put the feeler through the hole in the burner housing F refit the spacer G and screw the position nut C tight against the shoulder on the feeler raking sure the nut D is free during this operation 6 Tighten the lock nut D against the burner housing with a small wrench if necessary holding nut C vith another wrench Make sure the feeler is located as in figure 7
49. uently it lets through some gas when in closed position This condition may prevent reducing the flame to the required minimum It will cause too low cabinet temperature This can be controlled by turning the thermostat dial to O If the flame does not go down to the low flame by pass flame it will be necessary to clean the thermostat valve and valve seat Note The thermostat will not close to by pass on setting O unless the thermostat bulb is cooled down to at least 5 C 40 Ty Proceed as follows a Remove the plug spring and valve and clean the valve and the valve seat b Also check that the size of by pass screw is in accordance with table below Note The adjusting screw on the thermostat is preset at the factory and should never be readjusted LOST THERMOSTAT CHARGE If the thermostat control assembly loses its charge it will become inactive To test for a lost charge while the flame is reduced to minimum and the temperature control is set at a numbered position on its dial Remove thermostat capillary tube from its clamp in the evaporator and warm capillary end with the hand If the flame fails to increase in sire the thermostat has los t its charge and the themostat must be replaced 33 THERMOSTAT REPLACEMENT To replace the thermos tat remove capillary from its clamp on the fresh food evaporator fins Remove the two sealing plugs one on the outside and one on the inside of the cabinet Straighten the capillary an
50. uld be maintained at the full rate Turn thermostat dial to higher number Check fuses switches wiring etc and repair the fault Replace with a new heater see table page 37 Fit a new thermostat See par 44 Turn the thermostat dial to a lower number Re insert the capillary end of thermostat fully in the sleeve under the ice tray compartment See par 30 Have new thermostat fitted See wiring diagrams par 19 48 43 TROUBLE SHOOTING GAS OPERATED REFRIGERATORS a b c d e 8 i j k 1 m a b c d Cause Remedy The refrigerator does not cool satisfactorily Air circulation over cooling unit restricted Refrigerator not level Gas in bottle used up Feeler point of the flame failure device not heated enough by flame Clogged by pass screw Burner jet or burner head clogged Flue baffle not inserted into central tube of the cooling unit Baffle too low in flue Wrong gas pressure at the burner Burner assembly may be adrift Thermostat at wrong setting Failed cooling unit The refrigerator is too cold Thermostat at wrong setting End of thermoatat capillary tube incorrectly located Incorrect size of by pass screw Dirt in valve of the thermostat Remove any restriction See par 28 Fit new bottle Adjust position of feeler point in flame See par 15 Clean by pass screw with alcohol and by blowing throu
51. urner flame in to the central tube and supply sufficient primary and secondary air to the flame The flue baffle which is inserted in the central tube distributes the heat produced by the burner to the boiler system It is important that the correct size of baffle is used and that it is correctly located in the central tube in order to obtain the best cooling performance The size and the distance between the lower end of the baffle and the lower end of the central tube for different refrigerator models are shown in table Baffle Y Width x Length Ld Height Part No Baffle with support wire RM24 290 06 82 00 2 Length RM36C 289 00 28 00 0 RM46 RM47 289 00 28 00 0 RM66 RM67 289 00 28 00 0 Baffle height RM76 RM77 17 21 74 00 5 H x Baffle only Fig 51 Baffle sites height and part No CH Model Flue obstructions On gas refrigerators the flue will require cleaning occasionally To do this it will be necessary to gain access to the back of the cabinet When cleaning the flue proceed as follows Unscrew the outer burner shield and the burner housing release the flue and lift out the baffle on its support wire from the top of the boiler tube From the top clean the flue vith a suitable flue brush Also clean the baffle before putting back in place An obstruction in the flue will reduce or stop flue draft Flue obstructions will cause odors outside refrigerator slow freezing and
52. wnwards and the upper lid C upwards on RM24 and RM76 RM77 remove the plate D Fig 63 On the RM24 model it will also be necessary to remove the blow out protection flue Remove the fibre glass insulation around the heater so that the heater is accessible for removal Then bend aside the wire clip keeping the heater in proper position disconnect the heater leads from the cord and iemove the heater Make sure the new heater is fully inserted before bending back the wire clip with caution or it might snap off Reset the electric connections Be careful to put the Pibre glass insulation back in its proper place and in such a way that the heater leads will not be in direct contact with hot boiler tubes It is essential that the remplacement heater be of the proper rating in order to provide the correct heat input for the particular model The table below shows the correct heater for each model RM24 12 110 810 85 J9 U0U 3 RM36C 110 1 1 11 01 1 RM36C 12 110 9 1 1 07 00 1 RM46 RM47 110 1 2 12 01 9 RM46 RM47 12 110 10 1 2 08 00 9 RM66 RM67 110 1 4 13 01 7 RM66 RM67 12 110 11 1 4 09 00 7 RM76 RM77 110 2 1 74 01 4 38 19 WIRING DIAGRAMS 12V 110V for RM24 Thermostat Terminal block 12 Volts 110 Volts Heating element Black Terminal 12 Volts DC 110V for 110 Voits TK AC RM36C RM46 RM47 ES ls Terminal x RM66 RM67 RM76 RM77 block Switch Heater Thermostat Fig 6

Dometic RM 24 Fridge Service Manual

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