Service Manual - Bryant RV Services
Contents
1. essen 8 Operating the Shut Off 8 Troubleshooting Procedure Proper 9 Wiring Schematic seen 9 Troubleshooting Quick Reference Quick Reference Troubleshooting Steps 10 2 DC0040 K DC0051 K DE0040 DE0051 DE0240T DE0251T Refrigerator Service Manual DC0740 X DE0740 X DC0751 X DE0751 X Models Troubleshooting Procedure A Compressor Doesn t Run with Thermostat On Thermostat Compressor Does Not Run DC ircuit H Change DC OPERATION Short Power Supply Check AC Short Circuit Change DC Power Supply AC Power Supply OPERATION 37 45V Change AC Power Supply DC 0V See Figure 5 BAD Procedure B DC Power Change DC Supply Failure Power Supply Measure Terminal Voltage Of Temperature YES Control Between TP1 amp TP2 See Figure 1 Is Temperature Control LED on Check Supply Voltage 10 5 32V DC INCORRECT 85 132V AC CORRECT Correct Voltage Compressor Runs NO ex Reverse Polarity Replace Check Both INCORREC amp Check Operation 10 Fuse Veg gt OK See Figure 2 DC Fuses BLOWN Red Black NO Re2. 3 Measure the resistance of the compressor between point A and point B Refer to Figure ART01958 Figure 3 Measuring Compressor Resistance 4 DC0040 K DC0051 K DE0040 DE0051 DE0240T DE0251T Refrigerator Service Manual DC0740 X DE0740 X DC0751 X DE0751 X Models Troubleshooting Procedure Power Supply Output Voltage Power Supply Output Voltage DC DC Power Change DC OPERATION Supply Failure Power Supply Change DC Power Supply Change DC gt Power Supply Change DC Power Supply Check AC Power DCP Supply ower Less than 37 dd Supply Failure 15V AC OPERATION See Figure 5 Goto Procedure E FAULTY THERMISTOR Measure Voltage At the Compressor OV AG See Figure 4 DC Power Supply Failure THERMISTOR amp m DC Power Change DC ange i 37 45V DC Supply Failure Power Supply See Figure 5 Change DC Power Supply See 55 Procedure D amp E Note Measurements taken with 12 8V DC or 120V AC power supply 3 a o d Figure 4 Measuring Power Supply Output Voltage Figure 5 Measur Refrigerator Service Manual DCO0040 K DC0051 K DE0040 DE0051 DE0240T DE0251T 5 DC0740 X DE0740 X DC0751 X DE0751 X Models Troubleshooting Procedure D Measuring Compressor Amp Draw Compressor Amp Draw 60Watt lt 2 7Amps Failure Cooling Unit Measure Amperage at 40Watt 1 6 2 0Amps A
3. EVAPORATOR THERMISTOR Refrigerator Service Manual DC0040 K DC0051 K DE0040 DE0051 DE0240T DE0251T 9 DC0740 X DE0740 X DC0751 X DE0751 X Models Troubleshooting Quick Reference Quick Reference Troubleshooting Steps Check for supply voltage at the rear of the refrigerator 2 Turn the temperature control to the On position The operating voltage should be between 10 5V and 32V DC There will be some variation in these readings depending on the supply voltage 3 Check the compressor voltage between points A and B Voltage should be between 15V 25V AC Refer to Figure 10 If voltage is not within range refer to Procedure C 4 With the refrigerator power on take an Ohm reading 1 4 3 50 at the compressor between points A and B Refer to Figure 11 ART01958 T ME Figure 11 Taking an Ohm n Reading If the Ohm reading is not within range refer to Procedure B 5 With the refrigerator power off and the lead removed from point A take an Amp reading 1 6 3 3 Amps at the black wire with the rubber boot Refer to Figure 12 If amperage is not within range refer to Procedure D Q M 3 S E lt lt Figure 10 Checking Compressor Voltage Figure 12 Measuring the Amp Draw 10 DC0040 K DC0051 K DE0040 DE0051 DE0240T DE0251T Refrigerator Service Manual DC0740 X DE0740 X DC0751 X DE0751 X Models This Page Intentionally Left Blank NORCOLD Inc Customer Support Dept NO
4. NORCOLD Service Manual DCXXXX DEXXXX Model YE Compressor Refrigerators i ING DC0040 K DC0051 K DE0040 DE0051 DE0240T DE0251T DC0740 X DE0740 X DC0751 X DEO751 X Please note that the X at the end of certain model numbers indicates the equipment color where X can be black S stainless steel or W wrapped door stainless steel O 2007 NORCOLD INC All rights reserved Part No 6318424 08 08 07 Table of Contents Troubleshooting Procedure A Compressor Doesn t Run with Thermostat On 3 Troubleshooting Procedure B WARNING Perform all tests using a fully Compressor 4 charged 12V DC battery Using other equip Measuring the Compressor Resistance 4 ment that supplies DC voltage may cause Troubleshooting Procedure C permanent refrigerator component failure Power Supply Output 5 Troubleshooting Procedure D Measuring Compressor Amp 6 Troubleshooting Procedure E Verifying Thermistor Operation 7 Troubleshooting Procedure F Insufficient Cooling enn 8 Troubleshooting Procedures G Refrigerator is Too 8 Troubleshooting Procedure Auto Shut Off Device
5. RCOLD Inc Telephone 800 543 1219 P O Box 4248 Fax 937 497 3183 Sidney OH 45365 www norcold com DCXXXX DEXXXX Compressor REFRIGERATOR SERVICE MANUAL Part No 631842A 08 08 07
6. ecurely mounted to the evaporator plate m f you cannot determine a cause refer to Procedure E Troubleshooting Procedure H Auto Shut Off Device NOTE Only the 12 24V DC and DE Truck models are equipped with the auto shut off device within the power supply Operating the Shut Off Device To protect the cooling unit from overheating the refrigerator will automatically shut off when the ambient air temperature is approximately 110 F 43 C If shut off occurs the refrigerator will sound an intermittent alarm tone To stop the alarm the refrigerator must be restarted using the following procedure 1 Turn the temperature control counterclockwise to the Off position ART01956 2 Turn the temperature control to the desired setting NOTE The refrigerator will not restart until the ambient Figure 9 High Temperature Shut off Device conditions allow for normal operation NOTE To test the shut off device s functionality heat the device with a heat gun Refer to Figure 9 8 DC0040 K DC0051 K DE0040 DE0051 DE0240T DE0251T Refrigerator Service Manual DC0740 X DE0740 X DC0751 X DE0751 X Models Troubleshooting Procedure Proper Ventilation Ventilation is necessary for the correct operation of the refrig Reducing the vent area can cause the following erator Good ventilation also increases the life of the refrigera tor s cooling system The current models are equipped with built in ventila
7. on the Compressor See Figure 6 60Watt 2 7 3 3Amps 40Watt gt 2 0Amps Change Failure Cooling Unit 60Watt gt 3 3Amps ARTO01952 Note Measurements taken with 12 8V DC power supply ART01953 Figure 6 Measuring Compressor Amp Draw 6 DC0040 K DC0051 K DE0040 DE0051 DE0240T DE0251T Refrigerator Service Manual DC0740 X DE0740 X DC0751 X DE0751 X Models Troubleshooting Procedure E Verifying Thermistor Operation To measure the resistance of the evaporator thermistor com plete the following procedure 1 Turn the temperature control to the Off position 2 Disconnect the 3 pole connector Refer to Figure 7 3 Measure the resistance across the two pins Refer to Figure 8 4 Check the evaporator thermistor by measuring the tem perature and resistance of the thermistor Refer to Table 1 for a listing of acceptable resistance ranges NOTE In general 1 6K 29KO good thermistor Q defective thermistor An open thermistor will stop normal compressor operation Replace the defective thermistor ART01955 Figure 8 Measure Resistance Across Pins ARTO1954 PA G B Figure 7 Evaporator Thermistor Connection Inside Power Supply Evaporator Thermistor Resistance Thermistor Temperature Resistance Allowable F C Resistance Range 3 42 sm assmo o e ea 2sam0 w a da ees o ea do ee Table 1 Evaporator Thermisto
8. place 10A Fuse See Figure 2 Check DC Polarity Compressor Runs NO DC DC Power Change DC OPERATION Supply Failure Power Supply Measure Terminal Check AC Voltage of Temperature DC OV AC Control Between TP2 amp TP3 See Figure 1 OPERATION Power Supply 37 45V DC See Figure 5 DC Power Supply Failure Change DC Power Supply ART01945 DC 12 to 32V BAD Change AC Power Supply See Note Measurements taken with 12 8V DC or 120V AC power supply ART01944 3 amp lt Figure 1 Temperature Control Figure 2 Fuse Locations NOTE If 10 Amp fuse is blown check the vehicle s wiring Refrigerator Service Manual DC0040 K DC0051 K DE0040 DE0051 DE0240T DE0251T 3 DC0740 X DE0740 X DC0751 X DE0751 X Models Troubleshooting Procedure B Compressor Resistance Compressor Resistance Measure Internal Chande Compressor t Compressor ange Cooling Unit Resistance Failure See Figure 3 See Procedure C 1 4 3 5 Q Normal ART01947 Note Perform procedure at room temperature Measuring the Compressor Resistance 1 Turn the temperature control to the Off position 2 Remove the black wire to the compressor
9. r Resistance Refrigerator Service Manual DC0040 K DC0051 K DE0040 DE0051 DE0240T DE0251T 7 DC0740 X DE0740 X DC0751 X DE0751 X Models Troubleshooting Procedure F Insufficient Cooling NOTE Check input voltage before proceeding Refer to Procedure A If the compressor runs continuously do the following m Check the voltage across the fan leads There will m sure that the ventilation vents are not blocked be a slight voltage reading even if the fan isn t opera Refer to Procedure I tional The fan will only operate when the compressor m Make sure that the auto shut off device is operational is running and the ambient temperature is sufficient to Refer to Procedure H engage the fan The operational voltage of the fan is V P between 17 and 22VDC If this is present at the leads m f the reason for insufficient cooling is not found start and the fan is not running replace the fan with Procedure B Replace the cooling unit if m The compressor is hot to the touch and not vibrating CAUTION When servicing the fan do not short the wires Shorting the wires will damage m The compressor vibrates but there is no cooling the power supply Troubleshooting Procedure G Refrigerator is Too Cold If the refrigerator is too cold do the following m Adjustthe temperature control to a lower setting Num ber 1 is the warmest setting number 5 is the coldest m Make sure that the thermistor is s
10. tion systems that draw cooler air through the m Poor cooling performance of the refrigerator lower intake vent This air is then circulated over the cooling Continuous operation of the refrigerator unit to remove excess heat from the cooling system The heat ed air is then rejected through the upper vent If this airflow is m Fastbattery discharge blocked or decreased the refrigerator will not cool correctly m Voiding the refrigerator warranty CAUTION Do not block the vents by closet or cabinet doors m Shortened life of the refrigeration cooling unit Wiring Schematic FAN MOTOR 24V DC ORANGE ACINL m i 1 i ACIDC CN1 WHITE BSP VH converter DC OUT BLACK B2P VH AGINN T BLACK AC85 132V 17 5 AC DC PART DC INPUT eae 2 ___ OE TG 2 1 ps H DC 39V FOR 40W DC DC DC 41V FOR 60W 12 32V converter lt BLACK i DE MA BATTERY IN FUSE J INVERTER I se MONITOR OPTIONAL PROTECTOR eoe HIGH TEMPERATURE E PROTECTER THERMOSTA BUZZER OPTIONAL AMBIENT ELECTRONIC THERMISTOR GURRENT i LOW TEMPERATURE PROTECTOR PROTECTER 1 CN4 D 2 AMBIENT DC AC PART gt THERMISTOR 52222 5 400 tose occa secs EHR 2 E a BLACK BLACK lt
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