For Models: DE 441, DE461, DE451, DE490, DC440, DC451, DC490, MRFT415, MRFT440, MRFT460
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- Ethelbert Garrett
- 6 years ago
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1 TROUBLE SHOOTING & VENTILATION GUIDE For Models: DE 441, DE461, DE451, DE490, DC440, DC451, DC490, MRFT415, MRFT440, MRFT460 NORCOLD, INC. P.O BOX 4248 SIDNEY, OH Part No B (3/99)
2 Trouble Shooting - Reference Quick reference Compressor does not run Insufficient cooling Refrigerator to cold Procedure A Procedure E Procedure A Refer to "Is Temperature Control LED ON" Procedure B Procedure G Procedure F Procedure C Procedure D ART01205 Trouble Shooting 2
3 Trouble Shooting - Procedure A Compressor does not run Is Temperature Control LED on? YES NO Check connection from battery to refrigerator. Measure terminal voltage of Temperature Control between TP1 & TP2 If male to female connectors, insure of proper connection and that metal of wire is contacting metal of connector DC 0 V DC 5 V DC 2 V OR Short Circuit Power Supply Failure Normal Change Temperature Control Change Power Supply See Procedure B If butt connectors, insure of proper connection and that metal of wire is contacting metal of connector (not broken). OK Check DC Polarity Wrong Reverse polarity & check operation Compressor runs YES OK Good NO Check DC Fuse Bad Replace if defective 10A (DE/DC) 8A (MRFT) Compressor runs YES OK Good NO Check Battery Voltage ( VDC) Wrong Correct DC Voltage Compressor runs YES OK Good NO Measure terminal voltage of Temperature Control between TP3 & TP2 DC 0 V DC 12 to 32 V Power Supply Failure Normal Change Power Supply See Procedure B Figure 1 ART TroubleShooting
4 Trouble Shooting - Procedure B Figure 2 Black Blue Figure 3 Trouble Shooting 4
5 Trouble Shooting - Procedure C B A Figure 4 5 TroubleShooting
6 Trouble Shooting - Procedure D Evaporator Thermistor Figure 5 Trouble Shooting 6
7 Trouble Shooting - Procedure E Insufficient cooling NOTE: Inspect input voltage before proceeding. Refer to Procedure A - "Check Battery Voltage". Compressor cycles on and off frequently Hot to touch not vibration Vibration No Cooling Compressor Locked Low refrigerant charge Change Cooling Unit Measure input current to power supply 4.5A/12 VDC No See Procedure B Compressor Runs Continuously Refrigerator shelves covered with foil/paper. Yes Remove covering-allow air circulation No Measure ambient temperature 110 F and over Yes Correct/Add ventilation according to specifcations. See Procedure G No Begin with Trouble Shooting Procedue B ART TroubleShooting
8 Trouble Shooting - Procedure F Refrigerator to cold Adjust temperture control to lower setting Yes OK No Is the Evaporator Thermsitor securely mounted to plate? Reposition Thermistor or Tighten mounting screw Yes Set temperature control to setting 5 Connect a 20K Variable resistor in place of evaporator thermistor. Measure cut-in & cut-out resitance TP7 & TP8 See Wiring Schematic for test points. Reading should be /- 0.5k. MFRT's reading should be 14K +/-1K No Yes Replace evaporator thermistor Refrigeratror - Over 10.6K MRFT's - Over 15 Disconnect Thermostat coupler from power supply. Set the temperature control to 5. Measure resistance between TP1 & TP2. See page 3 test points of Temperature Control. Reading should be 13.5K +/-.05K MRFT Models Only Reading should be 5K +/-.05K Yes Replace power supply No ART01200 Replace temperature control Trouble Shooting 8
9 Ventilation - Procedure G Ventilation is required to assure efficient operation of the refrigerator and to increase the life expectancy of the refrigerator s cooling system. Ventilation allows fresh air to come from and exhaust to the living area of the vehicle by means of an inlet and an exhuast vents. These vents allow an adequate airflow over the rear mounted refrigerator condenser and cooling unit. These vents must be unobstructed and provide an open path to the rear of the refrigerator. Each refrigerator has a specified minimum air flow requirement. It is suggested to provide as much ventilation as possible. The more air circulating over the rear of the refrigerator, the more efficient the refrigerator will operate. Refer to Figures 6, 7 and 8 on pages 9 and 10 and the Ventilation Requirement Chart on page 11. Figure 6 CAUTION Failure to provide the required ventilation will result in shortened life expectancy of the cooling unit, poor refrigeration, continuous operation, accelerated battery discharge and will void the refrigerator warranty. Ventilation continued on page 10 9 TroubleShooting
10 Ventilation - Procedure G Outlet Vent To Cabin Living Area Figure 7 Figure 8 DC Fan Air Flow Inlet Vent From Cabin Living Area ART00556 In addition to the required vents sizes, a fan can be added to increase the refrigerator performance and to decrease the refrigerator current consumption. A fan kit is available through Norcold part distribution network. Refer to Fan Kit Assembly chart on page 11. Trouble Shooting 10
11 Ventilation - Procedure G Refrigerator DC440 DC451 DE451 DE490 DE/EV441 DE/EV461 Model VENTILATION REQUIREMENT CHART Min. Vent Sizes Without Fan Min. Vent Sizes With Fan 50 Square Inches Inlet 50 Square Inches Outlet 50 Square Inches Inlet 50 Square Inches Outlet 50 Square Inches Inlet 50 Square Inches Outlet 100 Square Inches Inlet 100 Square Inches Outlet 100 Square Inches Inlet 100 Square Inches Outlet 100 Square Inches Inlet 100 Square Inches Outlet 25 Square Inches Inlet 25 Square Inches Outlet 25 Square Inches Inlet 25 Square Inches Outlet 25 Square Inches Inlet 25 Square Inches Outlet 35 Square Inches Inlet 35 Square Inches Outlet 50 Square Inches Inlet 50 Square Inches Outlet 50 Square Inches Inlet 50 Square Inches Outlet Recommended CFM Fan Part Number FAN KIT ASSEMBLY Description Model AMP Fan Kit DE/DC Fan Kit DC Fan Kit DE Fan Kit DE Fan Kit DE TroubleShooting
12 Trouble Shooting - Wiring Schematic DC V + DC - DC Red Black Battery In + Battery In - Red DC Out + Black DC Out - AC V Orange White AC - IN (L) AC - In (N) AC/DC Converter + - DC 24 V AC/DC Part DC 24V Fan Motor Red Black Fan TP 3 DC Input + - DC/DC Converter DC W DC W Inverter Red + Black Blue Output Black TP 5 TP 6 TP 1 Red Orange Yellow Brown Battery Monitor Electronic Thermostat Input High Voltage Protector Electronic Current Protector TP 2 Black Low Temp. Protector TP 7 TP 8 Blue Blue Ambient Thermistor DC/Inverter Evaporator Thermistor ART01204 Trouble Shooting 12
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