x series with advance micro - Sunbelt Transport Refrigeration

2.3 CONDENSING SECTIONThe condensing section consists of anengine-compressor drive package, condenser fan,condenser/radiator coil, refrigerant controls, piping,wiring.The drive equipment includes the engine, clutch, aircleaner, muffler, coolant overflow bottle, and drive belts.Refrigeration components mounted in the condensingsection include the compressor, defrost air switch, suctionmodulation valve, filter drier, and receiver.2.3.1 Condenser CoilThe condenser coil is a tube in fin type and acts as a heatexchanger in which the compressed refrigerant gas islowered in temperature and condensed into a liquid. Airmovement over the condenser is provided by an electricmotor driven fan mounted in the condensing section.2.3.2 EngineThe diesel engine drives the compressor directlythrough a nylon drive gear and adapter. The adapteralso includes a V-belt sheave which drives the gearbox.The condenser/evaporator fan shaft is driven with aV-belt from the gearbox. The water pump V-belt drivesthe alternator.a. Engine Transducers and Sensors:1) Engine RPM Sensor (ENRPM) (Non ESC enginesonly)Non ESC Engines: Provides microprocessor withengine RPM information to be displayed and recorded inthe DataRecorder. It is located on the rear of the enginein the flywheel housing.ESC Engines: Provides the ENSCU with the engineRPM information for speed control of the engine. TheENSCU then sends the information to the microprocessorto be displayed in the unit Data List and then tobe recorded in the Data Recorder. It is located in the timingcase cover of the engine above the oil filter.2) Engine Oil Pressure Switch (ENOPS)This normally open switch allows the engine to operatewhen oil pressure is above 15 ¦ 2 PSIG (1.02 ¦ 0.1Bars). The switch will open and automatically stop theengine 5 seconds after pressure drops below 15 ¦ 2PSIG (1.02 ¦ 0.1 Bars). There is a 15 second delayafter the engine starts to allow the oil pressure to buildup before the microprocessor looks at the input from thisswitch. The switch is located on the front of the enginebelow the fuel solenoid.3) Engine Oil Level Switch (ENOLS) (Optional)ENOLS sets off alarm when oil level is low. Located onthe oil pan next to the oil fill.4) Engine Coolant Temperature Sensor (ENCT)Provides microprocessor with engine coolanttemperature information to be displayed and recorded inthe DataRecorder . The sensor is located on the starterside of the engine near the #4 Injector.5) Engine Coolant Level Sensor (ENCLS)(Optional)Sets off alarm when coolant level is more than 1 quartlow. Located in the coolant bottle.6) Engine Speed Control Unit (ENSCU) (ESC only)(See Figure 2-10)The ENSCU is mounted on the roadside frame behindthe upper door. (See Figure 2-4). It provides the RPMsignal to the microprocessor. The unit has an alarm LEDincorporated within it which is used to diagnose failureswithin the ESC system. See Section 10.4 for informationon diagnosing failures.LEDFigure 2-10. Engine Speed Control Unit (ENSCU)7) Fuel and Speed Actuator (FSA) (ESC only)The FSA combines the fuel shutoff solenoid and speedcontrol solenoid into one component. Engine speed iscontrolled by varying rod position.8) Engine Speed Sensor (ENSSN) (ESC only)The ENSSN provides the RPM signal to the ENSCU forspeed control. It is located on the front of the engine inthe gear case cover.62-106832--10