Foreword This service manual is the result of the dedication of The Dometic Corporation and its engineers in giving service people the necessary instruction for making accurate analyses of certain conditions. Provided is a diagnostic chart leading a qualified mechanic into the service manual pages to locate and solve symptoms which may occur. Dometic has continued its commitment in providing service people with this, the most up-to-date information about servicing Dometic RV accessories.
CONTENTS PAGE NO. RM2150,2190,2201 SERIES DIAGNOSTIC FLOW CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SECTION 1 OPERATION 1 .1 RM2150 Operation ........................................................................ 3 1.2 RM2190 Operation ........................................................................ 4 1.3 RM2201 Operation ....................................................................... 5 SECTION 2 AC VOLTAGE AC VOLTAGE REQUIREMENTS . . . . . . . . . . . . . . . .
This program will address the most common system problems associated with the RM2150/2190/2201 Manual Refrigerators supplied by The Dometic Corporation. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms. REFER SYMPTOM 1. No AC operation, (RM2201) CAUSE SECTION Operation AC Volts Heating Element Thermostat Switch Wiring 1.3 2 3 5.5 5.1 8.2 Operation Piezo Igniter Electrode Switch Wiring 1.1,1.2,1.3 5.2 5.3 5.1 8.2 3.
REFER SYMPTOM SECTION 8. Insufficient cooling on AC - cools properly on other mode(s). (RM2201) AC Volts Heating Element Thermostat 2 3 5.5 9. Insufficient cooling on gas. Cools properly on other mode(s). LP Gas Pressure Thermostat Filter Orifice Burner Flue Baffle Flue Tube 6 7.3 7.2 7.10 7.6 7.7 7.9 10. Won’t stay lit on gas. LP Gas Safety Valve Thermocouple Flue Baffle Crossover Tube Orifice Burner 6 7.4 7.5 7.7 7.8 7.10 7.6 11. No DC operation - cools properly on other mode(s).
SECTION 1 1 .1 RM2150 OPERATION A. GAS OPERATION 1) Set 12 volt switch to “OFF”. 2) Turn gas handle to left (so that handle is in 3) 4) 5) 6) line with gas valve body). Turn gas thermostat knob to #4 setting. Press gas safety valve plunger up and hold. Push piezo igniter plunger in repeatedly until flame is observed at “6”. When flame is lit: 1) Discontinue pushing the piezo plunger. 2) BUT continue to hold up on the safety valve plunger for about 15 seconds.
1.2 RM2190 OPERATION Gas Inlet Conn NOTE: If the gas has to be re-lit when the evaporator is still cold, the thermostat knob (8) must first be turned to MAX and returned to its normal setting only after the burner is lit. The refrigerator has a flame failure device which will automatically shut off the gas to the burner if the flame is blown out. While the plunger (C) is being held in, this device is temporarily inoperative. TO SHUT DOWN: Turn the handle of the gas valve (A) away from the cabinet. B.
1.3 RM2201 OPERATION A. GAS OPERATION 1) Rotate selector to “OFF” position. 2) Turn gas handle to the left. 3) Turn gas thermostat knob to #4 setting. 4) Press gas safety valve plunger up and hold. 5) Push piezo igniter plunger repeatedly until flame is observed at “6”. 6) When flame is lit: a. Discontinue pushing the piezo plunger. b. BUT continue to hold up on the safety valve plunger for about 15 seconds. c. If flame goes out when plunger is released, repeat Steps 4 through 6.
SECTION 2 AC VOLTAGE REQUIREMENTS The refrigerator is a 120 volt AC, 60 Hz appliance. The proper operating range is 100 to 132 volts. Check the AC volts at the receptacle where the refrigerator is attached. If voltage drops below 100 volts, cooling efficiency will decrease with voltage decrease. If voltage is outside of the proper operating range, correct the power source problem.
NOTE: It will take a very precise ohm meter to accurately read this measurement. If a precise ohm meter is not available, a continuity reading will indicate an open or complete circuit. If an open circuit is the test result, replace the element. SECTION 7 LP GAS COMPONENTS 7.1 SHUT-OFF VALVE This is the valve where the incoming LP gas supply is attached. To check the shut-off valve, remove and inspect for any obstructions. 5.
7.3 THERMOSTAT 7.5 THERMOCOUPLE On the LP gas mode, full line pressure is directed through the thermostat to the burner until the thermostat senses that the refrigerator cabinet has reached proper cooling temperature. At that time an internal valve closes and redirects the gas flow through the bypass screw. This reduces the amount of LP gas going to the burner assembly. The gas flow remains in this “bypass” mode until the thermostat senses that the refrigerator cabinet needs more cooling.
7.8 CROSSOVER TUBE The crossover tube is located at the top of the flue tube and is attached with a screw. It must be properly attached or flame outage could occur. If the balanced flue tube is too close to the opening of the crossover tube, it can also cause flame outage or difficulty in lighting. B. 12 Volt DC Connection for Heater: This connection is made to the terminal block. The refrigerator must be connected to the battery circuit with two wires of adequate capacity to avoid voltage drop.
SECTION 9 OTHER 9.1 LEVELING Leveling is one of the requirements for proper operation with absorption refrigerators. The absorption design utilizes no mechanical pumps or compressors to circulate the refrigerant within the system, so proper leveling must be maintained to provide the correct refrigerant flow. Without proper leveling, refrigerant within the cooling unit will collect and stagnate at certain areas. Without proper refrigerant flow, the cooling process will stop.
9.3 AIR LEAKS Check the gasket on the doors to be sure of a positive air seal. A simple method to check gaskets is to close the door on a dollar bill, then pull the dollar bill out. If no resistance is felt, the gasket is not sealing properly. This should be done on all four sides of the door. If a gasket is not sealing properly, first warm the gasket material with a hair dryer. DO NOT OVERHEAT If it is defective, replace with a new cooling unit.
