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DOMETICDometicMANUAL REFRIGERATORDIAGNOSTIC SERVICEMANUALThe Dometic CorporationCorporate OfficeWarrantyDepartment2320 Industrial ParkwayElkhart, IN

(1)This is Dometic’s Manual Refrigeration Diagnosis and Troubleshooting program. In this programwe will discuss the way an absorption cooling unit ope

(4)The cooling unit parts that accomplish this‘cooling’ or heat extraction process, include the:Boiler or Generator(5)Condenser(6)Evaporator\PUMP/ BOI

(7)AbsorberABSORBERTHE ABSORPTION SYSTEMCONDENSEREVAPORATORBecause the self-contained cooling unitdoes not utilize an electric compressoror pump, the

(10)We will now take a closer look at how thecooling unit functions in normal operation.When proper heat is supplied to the boiler,ammonia vapor is pr

I--U 3)As this process continues, the ammonia andIhydrogen vapors become intermixed and flow1downward into the absorber vessel. As theIammonia vapor c

(16)Since the absorption system utilizes nomechanical pumps or compressors to circulatethe refrigerant within the system, proper levelingis required t

(19)In recent years Dometic has engineered a newtype of cooling unit that utilizes an improvedsiphon pump tube design which drasticallyreduces the pos

(22)The coach vent system must be able to providea way to direct the hot air, produced by theaction of the cooling unit, out away from theinstallation

(25)Three things must be rememberedwhen diagnosing a cooling unit:First, circulation within the cool-ing unit is totally gravitational. Thismeans prop

(28)One of the faults with a cooling unit isa blockage. This can happen when theunit is operated off-ievel, or if too muchheat has been applied to the

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(31)Let’s look at the current Dometic refrigeratorsand see how the gas flows.(32)Gas flows from the gas line to the shut-off valveand to the connectio

(36)and onto the orifice and burner assembly.Remember that except for the connection piece,all fittings are O-ring sealed. Whenever thesystem is separ

(40)The most efficient way to diagnose the gassystem would be to first connect the gasmanometer to the pressure test point. With thethermostat set at

Turn on the main gas supply and take areading. If the manometer now reads 11 inches,the thermostat is defective and must bereplaced.(45)If the by-pass

(47)Once the gas has been allowed to passthrough the safety valve, it flows to the gas jetand burner. These have been specificallydesigned to eliminat

(51)The control assembly will now drop down andcan be pulled outward for service.(52)Pictured here is the other model design. Makesure the main gas su

There are 3 screws in the burner area thatmust also be removed. Please note - these aremachine screws, not sheet metal type. It isimportant for them t

The igniter reigniter, used on certain Dometicmodel refrigerators, operates on 12 volt current.On gas operation the igniter senses the resis-tance thr

wThe Electrical SystemThe electrical system consists of a combinationswitch assembly, heating element andthermostat. The quickest method of diagnosing

(67)Before an appliance can be sold to a recrea-tional vehicle manufacturer it must be testedand approved by a nationally recognizedtesting laboratory

MANUAL REFRIGERATORDIAGNOSTIC SERVICE ‘MANUALTable of ContentsPageDiagnostic Flow ChartsNo Operation . . . . . . . . . . . . .No 12OV AC Operation . .

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Glossary of TermsMANUAL REFRIGERATION1. ABSORBER: Section of the cooling unit where the hydrogen and ammonia vapor are intermixedin the absorber. Ammo

(Glossary of Terms . . continued)13.14.15.16.17.18.ORIFICE (JET): A small brass fitting that is mounted on the gas line just prior to the burner.This

TYPES OF BLOCKAGETo understand the absorption principle we have set up several refrigerators to inspect and diagnose.Carefully touch the absorber and

CHANGING THEHINGE POSITIONq]piGiGqRefrigeratorBulletin R54/7A _March 1987R54/7AMODELS: 2600,2602,2800,2802, 3600,3601,3800 & 3801IWHEN CHANGING T

(Bulletin R54/7A continued)5. Hold the door in its new position andcarefully retighten the hinge screws,being careful not to change the hingeposition.

PROCEDURE FORCHANGING COOLING UNITThe following categories have been establishedpredicated on similarity of design and procedurefor replacement of coo

(Bulletin R55/7A continued)INSTALL REPLACEMENT COOLING UNIT:1.2.3.4.5.6.7.Trim the Styrofoam portion of the coolingunit if it does not go freely into

(Bulletin R55/7A) continued)2.3.4.5.6.7.Apply sealing permagum (sealing tape) onmounting plate (A; FIG. B5).Apply thermal mastic on the evaporator coi

(Bulletin R55/7A continued)D. Category #4RM190RM2190 RM2 192REMOVAL OF COOLING UNIT:1.2.3.4.5.Remove cover and flue tube, then disconnectburner from c

MANUAL REFRIGERATORDIAGNOSTIC FLOW CHARTNO OPERATIONA.1Check Supply Voltage1. 110 Volt Plug2. Wire SizeI~>1Correct as NecessaryOKB.VCheck FuseCorre

(Bulletin R55/7A continued)3FIG. El(A)SEALINGPERMAGUM(Sealing Tape)FIG. E2F. Category #63RM75 RM76 RM77REMOVAL OF COOLING UNIT:1.2.3.3.5.Remove burner

(Bulletin R55/7A continued4. Tighten screws securely to obtain proper seal.5. Install heating elements completely back intothe pocket and plug in (FIG

Before You ChangeThat Cooling UnitPART I. PROPER DIAGNOSISCooling units are sometimes diagnosed as beingdefective when the actual problem is something

(Bulletin continued)FIG.A2Also, make sure the distance fromthe bottom of the refrigerator to theroof vent is at least the minimumdimension given in

[Bulletin R61/7A continued)B.1.33.4.PERFORMANCE TESTFirst perform all the preliminary checksdescribed previously.Remove all food from the refrigerator

(Bulletin R61/7A continued)NOTE: The cooling units currently being usedare specially designed to prevent overheating ofthe boiler tube even when opera

B]1DOmeticlREFRIGERATOR TECHNICAL DATARAK1 00RAK1302l RC15RC65GRC65Kl RC150l RC150ARC1 50TEGRC 150TEGl RC152RC160ERC 160ERC1 60TEGRC 1 60TEGl M52l M70

(Bulletin 828 . continued)RM3601215/12 0173757022 17.9RM3604 2934803996 53 (2007419191) 295/120 0173754045 2.5 48 ___RM3604215112 0173757022 17.9RM380

(Bulletin #28 continued)l Models that use brass heating elements approximately 3/4’ in diameter.NOTE: The formula for calculating amps & OHMS:Watt

Ell[Dometic1BULLETIN # 4 5MAY 1983Replacement of cooling units in RM760.Cooling unit 531A will replace 530A in production and service.When installing

MANUAL REFRIGERATORDIAGNOSTIC FLOW CHARTNO 120 VOLT AC OPERATIONA.1. Check AC Power2. Refrigerator Plugged in3. Breaker4. Coach Plug~=I Correct as Nec

CROSS REFERENCE OFREFRIGERATORS MANUFACTURED BYA.B. ELECTROLUX ANDDOMETlCARE PROCEDURE CHANGESKl:DometicREFRIGERATOR BULLETINREVISED AUGUST, 1984 #38S

HEATING ELEMENTS 360-460-660-760Previous literature covering the following models, lists the wattage of 110 voltheading elements as follows:RM360-120w

THE ABSORPTION SYSTEMWATER SEPARATORVAPOR PIPEA -\i’EAK A~I~IOSIA SOLUTIONB -STROSG AXIhIOSIA SOLUTIONc -LIQUID A~I>lO~IAD -X313lOSIA VAPORE -HYD

MANUAL REFRIGERATORDIAGNOSTIC FLOW CHARTNO GAS OPERATION - Models Equipped with Piezo igniter.Check Gas Supply9OKB.vCheck SwitchINOT OKCorrect as Nece

MANUAL REFRIGERATORDIAGNOSTIC FLOW CHARTNO GAS OPERATION - Models Equipped with Automatic ReigniterA.Check Gas PressureINOT OK> Correct as Necessar

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OPERATION & DIAGNOSISOFDOMETICMANUAL REFRIGERATORSD-6-1