Truck/Trailer Refrigeration Unit - Sunbelt Transport Refrigeration

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4.23 CONTROLLER SENSOR CHECKOUTAn accurate ohmmeter must be used to checkresistance values shown in Table 4-4.Due to variations and inaccuracies in ohmmeters,thermometers or other test equipment, a reading within2% of the chart value would indicate a good sensor. If asensor is bad, the resistance reading will usually be muchhigher or lower than the resistance values given inTable 4-4.At least one lead from the sensor (1RA, terminals D1or E1) must be disconnected from the unit electricalsystem before any reading is taken. Not doing so willresult in a false reading. Two preferred methods ofdetermining the actual test temperature at the sensor,are an ice bath at 0_C(32_F) or a calibrated temperaturetester.Table 4-4. Sensor Resistance -- Micro <strong>Unit</strong>s(CDT,1 RA, 2RA, 3RA & WTS)Temperature RAS & WTS CDT_F _CResistanceResistanceIn Ohms In Ohms--- 20 --- 28.9 165,300 1,653,000--- 10 --- 23.3 117,800 1,178,0000 --- 17.8 85,500 855,00010 --- 12.2 62,400 624,00020 --- 6.7 46,300 463,00030 --- 1.1 34,500 345,00032 0 32,700 327,00040 4.4 26,200 262,00050 10.0 19,900 199,00060 15.6 15,300 153,00070 21.1 11,900 119,00077 25 10,000 100,00080 26.7 9,300 93,00090 32.2 7,300 73,000100 37.8 5,800 58,000110 43.3 4,700 47,000120 48.9 3,800 38,000194 90 915 9,150212 100 680 6,800266 130 301 3,010302 150 186 1,8604.24 SUCTION PRESSURE TRANSDUCERA new suction pressure transducer must be calibrated,before it is installed .The calibration will not be performed if the run relayis energized. This prevents the operator from calibratingthe unit with the sensor in the system. The reading of thesensor must be at atmospheric pressure (0 psig or 14.7psi). If the sensor reading is greater than 20 psig (34.7 psi)or less than ---6.7 psig (8 psi) it cannot be calibrated. Oncethe microprocessor is calibrated, the display will readoutthe actual value.a. Turn power off and remove starter solenoid wire,then let unit fail to start. This will de-energize run relay.b. Connect wiring to new suction pressuretransducer. Before installing suction pressure transducerinto unit, display the suction pressure via the unit statusdisplay. While the suction pressure is being displayedpress Enter Key for three seconds. The display shouldread “0”. If display reads “0” install suction pressuretransducer into unit.Table 4-5. Suction Pressure Transducer VoltagePsig Voltage Psig Voltage Psig Voltage20” 0.369 30 0.761 70 1.15510” 0.417 35 0.810 75 1.2040 0.466 40 0.860 80 1.2535 0.515 45 0.909 85 1.30310 0.564 50 0.958 90 1.35215 0.614 55 1.007 95 1.40120 0.663 60 1.056 100 1.45025 0.712 65 1.1064-21 62-02884
4.25 5KW GENERATOR -- TRAILERThe 5KW generator requires very little preventativemaintenance to ensure good performance.Belt tension should be maintained at 50 ft-lbs.When trouble-shooting the 5KW generator, it isimportant to check the internal capacitor, theforward/reverse rotating diodes, and the internalwindings.The forward/reverse rotating diodes are located atthe filter end of the generator. The reverse diode ismarked with a red dot on the solder terminal. Theforward diode is unmarked. A faulty diode will give ashort circuit or open circuit reading in both directions.Generally, premature capacitor failure can beattributed to over-speeding or over-heating of thegenerator. The maximum speed for the generator is 3600rpm. Setting engine speed on multi-temp units is criticalto proper operation of the generator. The engine speedshould be set to 1500 rpm with unit operating in fullyloaded high speed cool mode, with all compartmentsturned on. Refer to Table 4-6 for correspondinggenerator voltage output.Table4-6.GeneratorVoltageOutputEngine RPM Generator RPM Volts / HZ.1530 3600 240 /60A generator fault finding guide is shown inFigure 4-21. This should be used whenevertroubleshooting a problem with a 5KW generator.ROTOR MAIN STATOR PER SECTION AUXILIARY WINDING10.7 Ohms 0.89 Ohms 1.18 OhmsThe rotating diodes can be testedduring this same operation. Thediode(s) must be removed from thecircuittotesteitherdiodeorrotorwinding resistance.Disconnect each lead and testresistance between U1 & U2 andU5 & U6. (Note: <strong>Unit</strong> wiring mustbe disconnected from generator forthis test.)Remove the wires from capacitor totest.FAULTOff LoadOn LoadNo OutputVoltageIncorrectVoltageVoltageUnstableNo OutputVoltageIncorrectVoltageVoltageUnstableOverheatingCheckResidualVoltageCheckSpeedCheckEngineGoverningCheck Loadfor ShortCircuitCheckSpeedCheckEngineGoverningOverLoadCheck allStatorResistancesCheckConnectionsInlet orOutletOpeningObstructedCheckCapacitorHot Engineor GeneratorAir CirculatingCheckRotorResistancesCheckRotatingDiodesFigure 4-21. Generator Fault Finding Guide62-028844-22
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TABLE OF CONTENTS (CONT’D)Section
Page 7 and 8:
LIST OF ILLUSTRATIONSFigurePage4-18
Page 9 and 10:
61 2 3 4 57 811 1091. Muffler2. Eng
Page 11 and 12:
213 4 58 106793 41. Run-Stop Switch
Page 13 and 14:
113214345678910151617111812191. Mai
Page 15 and 16:
1231. Fault Light2. Standby Power L
Page 17 and 18:
e. EvaporatorsThe compartments of t
Page 19 and 20:
1.2 ENGINE DATAEngine Model CT4-134
Page 21 and 22:
1.7 SAFETY DEVICESSystem components
Page 23 and 24: 2 3 4 5 6 7 8 9 101FUNCTIONO ISETPO
Page 25 and 26: 1.8.6 FUNCTIONAL PARAMETERSThe func
Page 27 and 28: Engine HoursThe number of diesel en
Page 29 and 30: Coolant Temperature Sensor AlarmThe
Page 31 and 32: g. Minimum On-TimeThe engine is all
Page 33 and 34: 1.12.3 Hot Gas Bypass Unloadera. Ma
Page 35 and 36: 1.14 REFRIGERANT CIRCUIT DURINGCOOL
Page 37 and 38: 1614513LSV31715HGV31614513LSV21715H
Page 39 and 40: 1614513LSV3 (NC)1715HGV3 (NC)161451
Page 41 and 42: 2.2.2 MANUAL STARTINGa. Starting In
Page 43 and 44: 2.6 CONTROL CIRCUIT OPERATION --STA
Page 45 and 46: FALLING TEMPERATURERISING TEMPERATU
Page 47 and 48: 62-028842-8Table 2-3. 3 Compartment
Page 49 and 50: INDICATION/TROUBLEPOSSIBLE CAUSESRE
Page 55 and 56: 4.2 MAINTENANCE SCHEDULE (TRAILER)U
Page 57 and 58: 1105432shaft). Energize solenoid fo
Page 59 and 60: . Electrical Pump (See Figure 4-4)T
Page 61 and 62: a. Alternator V-Belts (Trailer Unit
Page 63 and 64: 4.7 PUMPING THE UNIT DOWN ORREMOVIN
Page 65 and 66: 1. Suction Line2. Equalizer Line3.
Page 67 and 68: k. Slide compressor enough to clear
Page 69 and 70: . Solenoid Coil ReplacementNOTEThe
Page 71 and 72: 4.18.2 Solenoid Valve -- Sporlana.
Page 73: 4.22 CONFIGURATION OF MICROPROCESSO
Page 77 and 78: 4.27 SERVICING PHASE SEQUENCEWARNIN
Page 79 and 80: 4.30 THERMOSTATIC EXPANSION VALVETh
Page 81 and 82: Table 4-7. R-404A Pressure -- Tempe
Page 83 and 84: 62-028845-2Figure 5-1. Truck Units
Page 85 and 86: 5-4Figure 5-2. Truck Units --- Elec
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Truck/Trailer Refrigeration Unit - Sunbelt Transport Refrigeration

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