Manuals / Carrier / Kitchen Appliance / Refrigerator

Carrier 69NT20-531-300 manual Will not initiate defrost, Bent motor shaft

Models: 69NT20-531-300

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			REMEDY/
	CONDITION	POSSIBLE CAUSE	REFERENCE
			SECTION
	5.6 UNIT WILL NOT DEFROST PROPERLY -- Continued

	Will not initiate defrost	Manual defrost switch defective	Replace
	manually	Defrost temperature sensor open	4.9.5

	Initiates but relay (DR) drops	Low line voltage	2.3
	out	Low line voltage	2.3
	out
	Initiates but does not defrost	Heater contactor or coil defective	Replace

		Heater(s) burned out	6.15
		Heater(s) burned out	6.15

	Frequent defrost	Wet load	Normal

	5.7 ABNORMAL PRESSURES (COOLING)

		Condenser coil dirty	6.11

		Condenser fan rotating backwards	6.12
	High discharge pressure	Condenser fan inoperative	6.12

		Refrigerant overcharge or noncondensibles	6.7.1
		Refrigerant overcharge or noncondensibles	6.7.1
		Discharge service valve partially closed	Open

		Suction modulation valve malfunction	6.20

		Faulty suction pressure transducer	Replace

		Suction service valve partially closed	Open

		Filter-drier partially plugged	6.13

		Low refrigerant charge	6.7.1

	Low suction pressure	Expansion valve defective	6.14
		No evaporator air flow or restricted air flow	6.15

		Excessive frost on evaporator coil	5.6

		Evaporator fan(s) rotating backwards	2.3

		Suction modulation valve malfunction	6.20

	Suction and discharge pressures	Compressor operating in reverse	5.14
	tend to equalize when unit is
	tend to equalize when unit is	Compressor cycling/stopped	Check
	operating	Compressor cycling/stopped	Check

	5.8 ABNORMAL NOISE OR VIBRATIONS

		Compressor start up after an extended shutdown	Normal

		Brief chattering when manually shut down
		Brief chattering when manually shut down

		Compressor operating in reverse	5.14
	Compressor	Loose mounting bolts or worn resilient mounts	Tighten/Replace
		Loose upper mounting	6.8.1 step r.
		Liquid slugging	6.14

		Insufficient oil	6.9
		Bent, loose or striking venturi	Check

	Condenser or Evaporator Fan	Worn motor bearings	6.12/6.17
		Bent motor shaft	6.12/6.17

5-3

T-309

Image 62

Carrier 69NT20-531-300 manual Will not initiate defrost, Bent motor shaft

Contents

Service Model Safety Summary 309 Safety-2 Safety-3 309 Table of Contents Table of Contents Connect Remote Monitoring Check Controller Function CodesReplacing The Evaporator Fan Assembly Valve ReplacementEvaporator Coil Replacement Evaporator Heater Replacement Precheck Procedure Checking The Stepper valveElectrical Wiring Schematic Refrigeration Circuit Schematic Standard Operation Refrigeration Circuit Schematic Economized OperationDataCORDER Configuration Variables List of TablesSection Introduction Unit is fitted with a scroll compressorManual, T-300 Section Description Evaporator Section Compressor Section Condenser Section Module which allow communication with a master Communications interface module For further informationApproved Oil Mobil ST32 Oil Charge 2957 ml 100 ounces Model RSH105 Weight Dry 46.5 kg 103 lbTemperature Oil level range, with the compressor offElectrical Data Safety and Protective Devices Refrigeration Circuit 2.5.1 Standard Operation Standard Operation with Receiver Refrigeration Circuit Schematic -- Economized Operation Temperature Control System Section MicroprocessorKEY Function Controller Software Modes of Operation Perishable Mode -- Economy Controller Alarms Unit PRE-TRIP Diagnostics DCF02=5 Usda thermistor inputs Thermistor inputssupply & returnDCF02=2 DCF02=6Standard Configuration Download Report Raw Data Report for ABC1234567DataCORDER may be powered up in any one of four ways Logging Interval dCF03DataView DataCORDER Alarms CnF33 Snap Freeze Option CnF11 Defrost Off Selection NoOFFStd, Full SnAPDisplay Only Functions Sensor Reading Defrost temperature sensor reading is displayedPossibly delaying a needed defrost cycle Plicable with frozen set pointsController Function Codes Sheet 3 Controller Alarm Indications Sheet 1 Controller Alarm Indications Sheet 2 Controller Alarm Indications Sheet 3 Error Description Memory failureDraw test is done after 10 seconds Draw test is done after 15 secondsP1-1 OndsP6-2 Supply is comparedTest fails Crease, the test failsDenser fan is started and a 60 second timer is started Pressure switch is open or the condenser fan switch is openTimer is started Requirements Control temperature must be at least 15.6C 60FBy starting P10-0 over Requirements Control temperature must be at least 7.2C 45FSet point, the test proceeds to test Inapplicable Functions Display Title Data 10 DataCORDER Alarm Indications Operation 69NT Fresh AIR MakeupWill be displayed To start a pre-trip test, do the followingWill be displayed Controller Operation -- Perishable Mode Pull Down Falling RisingController Operation -- Frozen Mode Frozen Mode Defrost Section Troubleshooting Unit will not heat or has insuffi Will not initiate defrost Bent motor shaftSuperheat Unit reads abnormal currents Current sensor wiring Check Section Service Valve Frontseated BackseatedCompressor in a deep vacuum, internal dam- age will result Refrigerant Leak Checking Remove all refrigerant using a refrigerant recovery system Refrigerant Charge Compressor Upper Mounting Compressor OIL Level Condenser FAN and Motor Assembly Removing the Expansion Valve Two expansion valves are used, the evaporatorWrapped with Insulating compound. See Equalizer line Cleaned regularly. The preferred cleaning fluid is freshIf applicable, braze the equalizer connection to Check superheat refer to stepStart unit and check operation 14. Unloader Solenoid ValveEvaporator FAN Motor Capacitors Valve Override Controls Precheck Procedure TP1 Mounting Stud Type Shorter than the other wire Cut wires 5 cm 2 inches from shoulder of defecCut one wire of existing cable 40 mm 1-1/2 inch Cut one replacement sensor wire opposite colorMaintenance of Painted Surfaces 23 Door Hinge Repair Crack, Chip & Hole Repair Kit 24. Insert Location In-lbs #10 Ft-lbs 12.72 17.14 In-lbs Ft-lbs 13.99 18.8614.6 49.4 37.08 12.3 41.6 31.25 32.8 24.64 22.7 17.00 11.9 Section Electrical Wiring Schematic Schematic Diagram Wiring Diagram Sheet 1 Wiring Diagram Sheet 2 Index 309 Index-2