Dometic S1521 Service Tips Manual

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Service manual (92 pages)

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Page 1 RM3607 S1831 RM3807 Refrigerator Start-Up Information The new Dometic Refrigerator has been designed to provide more cooling power than ever before — surpassing all agency requirements and customer expectations. When starting this refrigerator for the very first time, the cooling cycle may require up to four hours of running time before the cooling unit is fully operational.
Page 2: Most Common System Problems
THE MOST COMMON SYSTEM PROBLEMS ASSOCIATED WITH THE S1521, S1531, S1621, S1631, S1821, S1831, RM2607, RM2611, RM2807, RM2811, RM3607, RM3807, RM3662, RM3663, RM3862, RM3863, RM4872 and RM4873 REFRIGERATORS. SYMPTOM CAUSE No operation - no panel lights Operation DC Volts Fuse...
Page 3 SYMPTOM CAUSE Insufficient cooling on AC - cools properly on other mode(s) AC Volts Heating Element Lower Circuit Board Insufficient cooling on DC - cools properly on other mode(s) DC Volts Heating Element Wiring Lower Circuit Board Insufficient cooling on gas - cools properly on other mode(s) LP gas Orifice Flue Baffle...
Page 4: Ice Maker Section
ICE MAKER SECTION SYMPTOM CAUSE 16. Ice Maker fails to start. Operation Arm in Up Position AC Voltage Water Valve Ice Maker Cycle 17. Ice Maker won’t make ice. Blades Frozen in Ice AC Voltage Water Valve Ice Maker Cycle 18.
Page 5: Gas Mode
CHECK COLDEST COLD 1 2 3 4 5 MODELS INCLUDE: S1521, S1531, S1621, S1631, S1821, S1831, RM2607, RM2611, RM2807, RM2811 AUTO MODE When operating in the AUTO mode, the AUTO mode indicator lamp (D) will illuminate. The control system will automatically select between AC and GAS operation with AC having priority over GAS.
Page 6: Aes Mode
DC MODE (3-Way Models Only) When operating in the DC mode, the DC mode indicator lamp (A) will be illuminated. All other mode lamps will be off. The DC mode overrides all other operating modes. If one of the other operating modes is desired, the DC selector button (2) must be in the UP (OFF) position.
Page 7: Battery Protection System
GAS MODE When operating in the GAS mode, the mode indicator lamp (E) will illuminate. The GAS mode provides LP gas operation only. The control system will activate the ignition system and will attempt to light the burner for a period of approximately 45 seconds. If unsuccessful, the CHECK indicator lamp (G) will illuminate and the gas mode indicator lamp (C) will turn off.
Page 8 2-WAY DISPLAY PANEL 3-WAY DISPLAY PANEL ROYALE REFRIGERATOR OPERATION MODELS INCLUDE: RM3662, RM3663, RM3862 and RM3863 AUTO MODE (2-WAY MODEL) Press the AUTO mode selector button (2) to the DOWN position. If 120 volts AC is available, the AC mode indicator lamp (B) will illuminate indicating AC operation.
Page 9: Temperature Selector
NOTE: DO NOT continue to reset GAS operation if the CHECK indicator lamp continues to be illuminated after several tries. Press the TEMPERATURE SELECTOR button (4) until the lamp (F) at the desired position is illuminated. DC MODE (3-WAY MODEL ONLY) Press the DC mode indicator button (2) to the DOWN position.
Page 10: Description Of Operating Modes
GAS MODE Move the mode selector button (2) to the UP position. The GAS mode indicator lamp (C) will illuminate. 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 purged from the gas line.
Page 11 The second standby mode of operation will execute when a failure of the temperature sensing device or associated electronic circuitry occurs. If this should occur, the control system will operate on the energy source selected via the control panel. The cooling unit will run continuously on the selected energy source. The refrigerator will continue to operate in this mode indefinitely or until a new sensor is installed and the system is reset.
Page 12 GAS MODE When operating in the GAS mode, the AES/AUTO (2) and AC/GAS (3) mode selector buttons must be in the UP (OFF) position. The GAS mode provides LP gas operation only. Press the GAS mode indicator button (4) to the DOWN (ON) position. Indicator lamps (C) and (E) should illuminate indicating GAS operation.
Page 13: Ac Voltage Requirements
GAS MODE When operating in the GAS mode, the GAS mode indicator lamp (C) will illuminate. The GAS mode provides LP gas operation only. The control system will activate the ignition system and will attempt to light the burner for a period of approximately 45 seconds. If unsuccessful, the CHECK indicator lamp (G) will illuminate and the GAS mode indicator lamp (C) will turn off.
Page 14: Dc Voltage Requirements
AC COMPONENTS HEATING ELEMENT Remove the heater leads from the lower circuit board and measure for proper resistance . You should obtain the following readings ± 10%: MODEL WATTS VOLTS OHMS S1521 S1531 S1621 S1631 S1821 S1831 RM2607 RM2611 RM2807...
Page 15 DC COMPONENTS – HEATING ELEMENT Check the heating element with ohms resistance. You should obtain the following readings ± 10%: MODEL WATTS VOLTS OHMS S1531 S1621 S1631 RM2607 RM2611 RM2807 RM2811 RM3607 RM3807 RM3663 RM3863 RM4873 A continuity reading will indicate an open or complete circuit. THERMISTOR Disconnect the thermistor harness from the P2, 2-pin terminal on the lower circuit board.
Page 16: Solenoid Valve
TO THER- TO T HERMISTOR MISTOR NOTE: Dometic refrigerators do not come equipped with a thermistor adjuster. This is an add-on component. SOLENOID VALVE Check the solenoid with a properly calibrated ohm meter. Remove the connector from the solenoid and measure the resistance across the terminals.
Page 17: High Voltage Cable
IGNITER Verify proper voltage at the positive (+) and ground (–) terminals of the igniter. Remove high voltage cable fro igniter. The igniter should produce a sparking sound during trial-for-ignition. The igniter installed on the refrigerators as original equipment is part number 2931132019 (RV Gas Model 679).
Page 18: Upper Circuit Board
UPPER CIRCUIT BOARD 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. With main ON/OFF switch on display panel in OFF position: Check for DC voltage at Plug 1, Terminal 4 (orange or white wire) and terminal 5 (red wire) negative (–)
Page 19 If you experience a problem on any of the above checks, verify the fuses on the lower circuit board are good. If all checks prove to be good, and the refrigerator does not operate on electric mode, replace the lower circuit board.
Page 20: Climate Control Heater
D. GAS MODE: Verify that the following components are good: upper circuit board, thermistor and 3-amp fuse. Check for voltage during trial-for-ignition at Plug 3, Terminals 1 (white wire) and 2 (yellow wire) to the solenoid. If no voltage is present, change the circuit board. Next, check for voltage to the igniter.
Page 21: Lp Gas Requirements
LP GAS REQUIREMENTS The LP gas pressure to the refrigerator should be 11 inches water column with half of all BTU’s of the RV turned on. With all other appliances off, the pressure to the refrigerator should not exceed 12 inches water column.
Page 22 The orifice is cleaned by using an alcohol based solvent and allowing to air dry. If there is a lack of cooling on gas operation, verify the orifice is the proper size per the chart below: S1521 RM2607 #53 RM3662...
Page 23: External Wiring
FLUE TUBE FLUE The flue tube must be cleaned periodically, at least once a year TUBE Clean by using a flue brush, Dometic Part No. 0151404001. WIRING EXTERNAL WIRING 1. 120 Volts AC Connection The refrigerator is equipped with a three-prong (grounded) plug for protection against shock hazards and should be plugged directly into a properly grounded three-prong receptacle.
Page 24: Internal Wiring
INTERNAL WIRING Verify the refrigerator is wired per the wiring diagram for the exact model you are working on. See the following typical wiring diagrams. AMES & AES Circuit Board Power TYPICAL 3-WAY WIRING Circuit Board Display Thermistor DIAGRAM Gas Valve Reigniter Thermocouple Electrode...
Page 25 ROYALE & ELITE TYPICAL 2-WAY WIRING DIAGRAM 293267500...
Page 26: Wiring Diagram
Without proper leveling, refrigerant within the cooling unit will collect and stagnate at certain areas. Both Dometic and Servel brand refrigerators have a type of cooling unit that utilizes an enclosed pump tube surrounded by a solution.
Page 27: Air Leaks
VENTILATION The coach vent system must be able to provide a way to direct the hot air, produced by the action of the cooling unit, out away from the installation of the refrigerator. In a proper installation, there should be as little open space as possible surrounding the sides and top of the refrigerator to achieve proper air flow.
Page 28 ROYALE AND ELITE MODELS: CONDENSATE WATER DRAIN HOSE: A 3/4" hole must be drilled through the flooring in the opening of the base plate on the rear of refrigerator. The refrigerator is secured in the enclosure with six screws. They must be installed in the following order: First: Two screws are installed in front decoration strip and through the front base.
Page 29: Door Position
D. Replace the top decoration panel. Third: Two screws installed as shown in rear base. DOOR POSITION The door position can be checked by observing any misalignment of the door in relation to the frame. SMOOTH FIT, PROPER SEAL To adjust either door, loosen the hinge bracket screws, reposition the door then tighten the hinge bracket screws.
Page 30 COOLING UNIT The chemicals involved in the cooling process include hydrogen, ammonia, water, and a rust inhibiting agent. There are no repairs recommended on the cooling unit. TO DIAGNOSE ALL COOLING UNITS Models RM3662, RM3663, RM3862, RM3863, RM4872, RM4873 After four hours of operation, feel the back plate of the freezer section. It should be cold to the touch. If cold to the touch, the unit is working.
Page 31: Ice Maker Operation
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 ice level bail arm to DOWN position. ICE LEVEL BAIL ARM DOWN POSITION When the ice maker thermostat senses the preset temperature for ejection of the ice cubes, the fingers will...
Page 32: Mold Thermostat
MOLD THERMOSTAT This is a single-pole, single-throw, bimetal switch. It starts an ejection cycle by closing at 18°F ± 5°. The reset temperature is 50°F± 5°. The thermostat is in series with the mold heater and acts as a safety against overheating in case of a mechanical failure.
Page 33: Ice Maker Assembly
TIMING MOTOR This is a low-wattage, stall-type motor which is geared to the timing cam and ice ejector. It is a one RPM motor. Disconnect power to the appliance and test for continuity between the two leads. WATER VALVE This valve is solenoid operated. When it is open, it releases water from the source to the mold. The amount of water is proportional to the length of time the water valve switch is held closed by its timing cam.
Page 36: Water Fill Adjustment
ICE MAKER – OTHER WATER FILL ADJUSTMENT 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" high and 2-1/2" long. If the water overflows in the mold, first check to see if the ice maker unit is level in the appliance. Next ensure that the appliance is installed level in the RV.
Page 37: Water Supply
WIRING Refer to the wiring diagram supplied with the unit you are working on, and make sure all wiring connec- tions 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. AMES &...
Page 38 This Manual is Compliments of Northwest RV Supply 86325 College View Road Eugene, OR 97405 Local: 541-746-9092 Toll-Free: 866-678-7467 Fax: 541-736-5573 http://www.nwrvsupply.com mail@nwrvsupply.com Northwest RV Supply carries a large spectrum of surplus, used, and new RV parts and components. Please feel free to visit our website for additional information.

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Dometic S1521 Service Tips Manual

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