Carrier Supra 950MT Operation & Service Manual
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Carrier Supra 950MT Operation & Service Manual

Truck refrigeration units with cab command controller
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Truck Refrigeration
OPERATION & SERVICE MANUAL
For The
Supra 950MT
with Cab Command Controller
Truck Refrigeration Units
62-11863 Rev C

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Summary of Contents for Carrier Supra 950MT

  • Page 1 Truck Refrigeration OPERATION & SERVICE MANUAL For The Supra 950MT with Cab Command Controller Truck Refrigeration Units 62-11863 Rev C...
  • Page 3 OPERATION & SERVICE MANUAL For The Supra 950MT with Cab Command Controller © 2017 Carrier Corporation Printed in USA July 2017 ●...

  • Page 5: Table Of Contents

    TABLE OF CONTENTS PARAGRAPH NUMBER PAGE SAFETY PRECAUTIONS ............. . . 1–1 SAFETY PRECAUTIONS .
  • Page 6 2.10 REFRIGERANT CIRCUIT DURING HEAT AND DEFROST ......2–21 2.10.1 Hot Gas Heating ..........2–21 2.10.2 Principle of Induction Heating (Electric Heat) .
  • Page 7 SERVICING ENGINE-RELATED COMPONENTS ....... . . 5–3 5.2.1 Cooling System .
  • Page 8 5.17 SUCTION PRESSURE TRANSDUCER ......... 5–21 5.18 MICROPROCESSOR .
  • Page 9 Figure 2.3 Supra 950MT Model - Roadside View ....... . .
  • Page 10 LIST OF TABLES TABLE NUMBER Page Table 2–1 Additional Support Manuals ............2–1 Table 2–2 Model Chart .

  • Page 11: Safety Precautions

    Your Carrier Transicold refrigeration unit has been designed with the safety of the operator in mind. During normal operation, all moving parts are fully enclosed to help prevent injury. During all pre-trip inspections, daily inspec- tions, and problem troubleshooting, you may be exposed to moving parts.

  • Page 12: Maintenance Precautions

    The refrigerant contained in this unit can cause frostbite, severe burns, or blindness when in direct contact with the skin or eyes. For this reason and because of legislation regarding the handling of refrigerants during system ser- vice, we recommend that you contact your nearest Carrier Transicold authorized repair facility whenever your unit requires refrigeration system service.

  • Page 13: Specific Warning, Caution, And Notice Statements

    SPECIFIC WARNING, CAUTION, AND NOTICE STATEMENTS To help identify the label hazards on the unit and explain the level of awareness each one carries, an explanation is given with the appropriate consequences: DANGER DANGER - warns against an immediate hazard which WILL result in severe personal injury or death. WARNING WARNING - warns against hazards or unsafe conditions which COULD result in severe personal injury or death.
  • Page 14 WARNING Under no circumstances should ether or any other starting aids be used to start engine. WARNING Always place the RUN/STOP switch in the STOP position and turn off the power supply before disconnecting the power plug from the unit. WARNING Make sure the power plug is clean and dry before connecting to any power source.
  • Page 15 CAUTION In units with R404A and POE oil, the use of inert gas brazing procedures is mandatory, other- wise compressor failure will occur. See Technical Procedure 98-50553-00 Inert Gas Brazing for more information. CAUTION Use only ethylene glycol antifreeze (with inhibitors) in system as glycol by itself will damage the cooling system.

  • Page 16: 1.10 Safety Decals

    1.10 SAFETY DECALS 62-11863...
  • Page 17 62-11863...

  • Page 19: Unit Description

    The unit may cycle the engine, standby motor or fans unexpectedly as control require- ments dictate. Table 2–1 Additional Support Manuals Manual Number Equipment Covered Type of Manual -- -- -- Supra 950MT Parts included in T-T PLUS Rev. D 62-11861 Supra 950MT Operator’s Manual 62-10299 Compressor (05G)

  • Page 20: Figure 2.1 Supra 950Mt Model - Top View/Cab Command

    Figure 2.1 Supra 950MT Model - Top View/Cab Command 1. Dip Stick 7. Fittings for MT evaporators 2. Muffler 8. Compressor pressure regulating valve (CPR) 3. Engine (Refer to Section 2.7.1) 9. Filter drier 4. Compressor (Refer to Section 2.7.4) 10.

  • Page 21: Figure 2.2 Supra 950Mt Model - Curbside View

    Figure 2.2 Supra 950MT Model - Curbside View Figure 2.3 Supra 950MT Model - Roadside View 1. Negative Battery Cable 8. Air Cleaner 2. MP + Wire 9. Receiver Sight Glass 3. Fuel Lines 10. Receiver 4. Positive Battery Cable 11.

  • Page 22: Figure 2.4 Evaporator (Mts 1100 Illustrated)

    Figure 2.4 Evaporator (MTS 1100 Illustrated) 1. Return Air Sensor 6. Fan and Motor Assembly 2. Evaporator Coil 7. Check Valve Assembly 3. Defrost Termination Temperature Sensor 8. Liquid Line Valve Assembly 4. Evaporator High Temperature Switch 9. Hot Gas Valve 5.

  • Page 23: Figure 2.5 Electrical Box

    Figure 2.5 Electrical Box 1. Capacitors 5. EHR Contactors 2. Standby Motor Contactor (MC) 6. Main Fuse (80 amps) 3. Motor Overload Relay (MOL) 7. Buzzer 4. Manual Run/Stop Switch 8. Relay and Fuse Board - - - - - 62-11863...

  • Page 24: Figure 2.6 Control Relay Board View

    Figure 2.6 Control Relay Board View The Supra 950MT control relay board allows better maintenance using pin connections (TP01 to TP 17). Output voltage can be measured pin-by-pin to check the relay’s power supply. Figure 2.7 Multi-Temp Sub Panel 62-11863...

  • Page 25: Table 2-4 Fuse Identification

    Table 2–4 Fuse Identification Designation Item Amps Main fuse 80 A RCR fuse Run Relay fuse 15 A Main Heater Relay fuse Unloader fuse 1 Liquid Solenoid Valve fuse 2 Liquid Solenoid Valve fuse Fuel pump fuse 1 Hot Gas Valve Fuse 7.5 A 2 Hot Gas Valve Fuse 7.5 A...

  • Page 26: General Description

    2.2.2 Truck Condensing Units The Supra 950MT is a one-piece condensing unit designed for truck applications available for R404A refrigerant. It is equipped with an electric standby motor. The model/serial number plate is located on the frame on the inside of the unit.

  • Page 27: Multi-Temperature Evaporators

    A remote standby receptacle is standard with all units. 2.2.3 Multi-Temperature Evaporators The compartments of the Supra 950MT system are equipped with separate evaporators. For multi-temp applications, single discharge and double discharge evaporators are available. The evaporators are different in size, capacity and number of fans (See Table 2–3), but all work on the same principle and use the same single-phase 50Hz/60Hz fan...

  • Page 28: Switches And Controls

    The clutch assembly is mounted on the engine crankshaft. All units have centrifugal type clutches. c. Standby Motor/Generator The Supra 950MT is equipped with a heavy-duty electric standby motor operating on nominal 208V/230V-3ph- 60Hz. Overload and short cycle protection is provided along with automatic reset. Units are also equipped with a remote mounted power receptacle.
  • Page 29 City Speed Key The CITY SPEED key is disabled on the Supra 950MT as it is a single-speed only machine. Alarm Key Press and hold the ALARM key for 3 seconds to disable the Cab Command buzzer. When not disabled by use of this key, the buzzer is activated whenever the alarm/fault indicator is illumi- nated.

  • Page 30: Condensing Section Refrigeration System

    Figure 2.9 70 Amp Alternator 12VDC Terminal (D+, Output) R e g u l a t o r, B r u s h H o l d e r, Brushes (Internal) Ground Terminal (B-) Positive Output Terminal (B+) Alternator/Regulator Observe proper polarity when installing battery, negative battery terminal must be grounded. Reverse polarity will destroy the rectifier diodes in alternator.

  • Page 31: Figure 2.10 Cylinder Head - Unloaded

    - - - - - b. Compressor Manifold The Supra 950MT unit compressor is fitted with one electric unloader valve. The capacity-controlled cylinder is easily identified by the solenoid, which extends from the side of the cylinder head. When the solenoid is energized, two cylinders are unloaded.

  • Page 32: Figure 2.11 Cylinder Head - Loaded

    Figure 2.11 Cylinder Head - Loaded 1. Solenoid valve 9. Strainer 2. Valve stem 10. Suction manifold 3. Gas bypass port 11. Cylinder discharge valve 4. Spring guide 12. Valve plate 5. Spring 13. Cylinder suction plate 6. Piston 14. Discharge piston check valve assembly 7.

  • Page 33: Remote Evaporator Sections

    d. Accumulator/Subcooler/Heat Exchanger The accumulator is a refrigerant holding tank located in the suction line between the evaporator and compressor. The purpose of the accumulator is to prevent entry of any liquid refrigerant into the compressor and further subcool liquid refrigerant to TXV. The tube-in-tank type heat exchanger is internal to the accumulator.

  • Page 34: Electric And Electric Hot/Gas Heat

    2.5.4 Electric and Electric Hot/Gas Heat The unit can be equipped with electric heat and electric/hot gas heat. When the microprocessor calls for heat, the heater contactor will close or valve will open and engage the heat system. 2.5.5 Receiver Pressure Valve (RPV) The Receiver Pressure Valve is a normally closed valve.

  • Page 35: System Operating Controls And Components

    SYSTEM OPERATING CONTROLS AND COMPONENTS The unit is furnished with a microprocessor control system (Refer to Section 3.1). Once the desired set point is entered at the Cab Command in the truck, the unit will operate automatically to maintain the desired temperature within very close limits.

  • Page 36: Lubrication System

    UNIT SPECIFICATIONS 2.7.1 Engine Data Engine Model D1105 Used on Supra 950MT Displacement 68.5 in (1105 cc) Do. Cylinders Horsepower 14.9 kw (20 hp) @2400rpm Weight 214 lbs (97 kg) Coolant Capacity 5 quarts (4.7 liters) Oil Capacity without oil bypass kit 10 quarts (9.5 liters)

  • Page 37: Compressor Reference Data

    2.7.4 Compressor Reference Data Model 05G 37CFM No. Cylinders No. Unloaders Weight 137 lbs (62 kg) Oil Charge 5.5 pints (2.6 liters) Approved Oil Mobil Arctic EAL 68 2.7.5 Refrigeration System Data Defrost Timer 1.5h, 3h, 6h, or 12 hours Opens at: 50°F ±...

  • Page 38: Torque Values

    2.7.7 Torque Values Assembly ft-lb Power Tray to Frame Standby Motor to Power Tray Engine to Power Tray 67.8 Compressor to Power Tray Standby Motor Pulley 36.8 49.7 Engine Pulley Compressor Pulley Evaporator Fan Motor 17.6 Evaporator Fan Grille Condenser Coil to Chassis Tensioner to Power Tray Engine Support Condenser Fan Blade...

  • Page 39: Refrigerant Circuit During Cooling

    REFRIGERANT CIRCUIT DURING COOLING Overview When cooling, the unit operates as a vapor compression refrigeration system. The main components of the system are the reciprocating compressor, air-cooled condenser, thermostatic expansion valve, direct expansion evapora- tor, and liquid line solenoid valve. The compressor raises the temperature and pressure of the refrigerant and it passes through a normally open Main Heat Valve (MHV), through a check valve into the condenser (See Figure 2.13...

  • Page 40: Principle Of Induction Heating (Electric Heat)

    Heat Mode When in the heat mode, with neither evaporator calling for cooling, the hot gas solenoid valves 1HGV and 2HGV could be energized. The main heat valve (MHV) will close, diverting the refrigerant to 1HGV and 2HGV. The nor- mally closed liquid solenoid valves 1LSV and 2LSV will energize and open.

  • Page 41: Figure 2.13 Refrigeration Circuit - Cooling

    Figure 2.13 Refrigeration Circuit - Cooling LSV2 2HGV LSV1 1HGV 1. Compressor 11. Filter-Drier 2. High Pressure Switch (HP) 12. Sight Glass 3. Discharge Service Valve 13. Liquid Solenoid Valve (LSV) 4. Main Heat Valve (MHV) 14. Expansion Valve 5. Check Valve 15.

  • Page 42: Figure 2.14 Refrigeration Circuit - Heating

    Figure 2.14 Refrigeration Circuit - Heating LSV2 2HGV LSV1 1HGV 1. Compressor 11. Filter-Drier 2. High Pressure Switch (HP) 12. Sight Glass 3. Discharge Service Valve 13. Liquid Solenoid Valve (LSV) 4. Main Heat Valve (MHV) 14. Expansion Valve 5. Check Valve 15.

  • Page 43: Operation

    OPERATION MICROPROCESSOR CAUTION Under no circumstances should anyone attempt to repair the logic or display boards. Should a problem develop with these components, contact your nearest Carrier Transicold dealer for replacement. Figure 3.1 Cab Command 1. Alarm Key 13. Cool Mode 2.

  • Page 44: Introduction

    3.1.1 Introduction The microprocessor and relay module is housed in the control box: • The processor board includes the microprocessor, program memory, and necessary input/output circuitry to interface with the unit. • The relay module contains replaceable relays and fuses along with the wiring harness. The cab command is mounted remotely in the truck, and includes the LCD display, keypad, and keypad interface (See Figure...

  • Page 45: Starting Unit - Engine / Road Operation

    STARTING UNIT - ENGINE / ROAD OPERATION WARNING Under no circumstances should ether or any other starting aids be used to start the engine. 1. Place the unit RUN/STOP switch, which is located on the side of the electrical box, in the RUN position. 2.

  • Page 46: Starting Unit - Electric / Standby Operation

    STARTING UNIT - ELECTRIC / STANDBY OPERATION WARNING Under no circumstances should ether or any other starting aids be used to start engine. Make sure the power plug is clean and dry before connecting to any electrical outlet / receptacle. Do not attempt to connect or remove power plug or perform service and/or maintenance before ensuring the unit RUN/STOP switch is in the STOP position, the I/O switch is in the OFF (O) position and the external power circuit breaker is OFF.

  • Page 47: Start / Stop Operation

    Standby Guidelines NOTE Check for proper motor rotation. Condenser air must be drawn into the unit (see indicating flag on front grille). To reverse rotation, stop the unit, disconnect power cord, and change polarity of plug. For safe, reliable operation in standby mode, it is important to consider the following guidelines: •...

  • Page 48: Continuous Run Operation

    Once the unit starts in Auto Start/Stop, it will run until: • It runs for the predetermined minimum run time • Engine coolant temperature is above 122°F (50°C) • Box temperature is at set point The microprocessor will not shut off the engine if the battery voltage is not sufficient to restart it. Battery voltage above approximately 13.4 volts is required for shutdown.

  • Page 49: Changing Set Point

    CHANGING SET POINT Set points for each compartment can be set independently. Settings for C1 and C2 will alternate every five sec- onds. Wait until the desired compartment is displayed and then: 1. Press the UP or DOWN arrow key to increase or decrease displayed set point. 2.

  • Page 50: Manual Defrost

    MANUAL DEFROST 1. Press the MANUAL DEFROST key to initiate defrost. Defrost mode may be initiated in two different ways if the evaporator coil is below 45°F (7.2°C): • Defrost is initiated automatically at preset intervals by the defrost timer in the microprocessor. •...

  • Page 51: 3.10 Function Change

    3.10 FUNCTION CHANGE 2, 4 1. Press the FUNCTION key. 2. Press the ENTER key to select the desired function to change. 3. Press either the UP or DOWN ARROW key until the desired function setting is displayed. 4. Press the ENTER key to select. NOTE Function changes will change the operation of the unit.

  • Page 52: Table 3-1 Function Parameters

    The selection for starting the unit is displayed AUTO OP (FN7 ON) for Auto Start operation or MAN OP (FN7 OFF) for Manual Start operation. AUTO OP must be used to start the Supra 950MT; Manual Start is no longer in use.

  • Page 53: 3.11 Unit Data / Compartment Menus

    When the Out-of-Range Temperature is configured ON, the microprocessor indicates out-of-range when the tem- perature has been within the tolerance band at least once, and then goes outside the tolerance band for 45 min- utes. If this condition occurs, the unit will shut down or shown an alarm depending on the setting of CNF9. For set points at or below +10°F (-12.2°C) frozen range, the unit is only considered out-of-range for temperatures above set point.

  • Page 54: Compartment Status Menu

    3.11.1 Compartment Status Menu The Compartment Status Menu, brought up by a single press of the UNIT DATA / COMP. key from the default screen, displays the status of compartments that are turned ON. The timeout period for the Compartment Status Menu is 5 seconds after which the user is directed back to the default screen.

  • Page 55: Table 3-6 Unit Data Codes

    Table 3–6 Unit Data Codes Code English Data SUCT Suction Pressure Engine Hours Engine Temperature Return Air Temperature C1 C2 Defrost Thermistor Sensor Not used in Supra 950MT C1 Defrost Thermistor Sensor Discharge Temperature CD10 BATT Battery Voltage CD11 Standby Hours CD12 MOD V...
  • Page 56 Celsius (i.e. 2RA 85.0F). CD17: Compartment 3 Return Air Temperature Not used in Supra 950MT CD19: Maintenance Hour Meter 2 The Maintenance Hour Meter 2 setting is displayed with the description MHR2 on the left side or CD19. The main- tenance hour meter is compared to one of the hour meters (diesel, standby, or switch on) determined by its mode.

  • Page 57: 3.12 Alarm Display And Reset

    3.12 ALARM DISPLAY AND RESET 1. To reset the display, Press the FUNCTION key and then the UP or DOWN arrow key until ALARM RST is displayed. 2. Press ENTER to clear the alarm. ALARM CLR will be displayed. (Unit will restart if alarm condition has been corrected and unit is in Start/Stop or Auto OP).
  • Page 58 Table 3–7 Alarm Display (Continued) AL14 SBY MOTOR Standby Motor Overload Open AL15 FUSE BAD Fuse Open AL16 3RA SENSOR Not used in Supra 950MT AL17 DISPLAY Display Communication Failure AL18 SERVICE 1 Maintenance Hour Meter 1 AL19 SERVICE 2...
  • Page 59 The fault light (FL) is on. AL16: Compartment 3 Return Air Sensor Alarm Not used in Supra 950MT AL17: Display Alarm When no communications exist between the main board and the display board for eight seconds, the Display alarm...

  • Page 60: 3.13 Stopping Unit

    3.13 STOPPING UNIT WARNING Always place the RUN/STOP switch in the STOP position and turn off the power supply before disconnecting the power plug from the unit. 1. Press and hold the UNIT DATA / COMP. key to go to Compartment Selection mode. 2.
  • Page 61 TEMPERATURE SET-POINT ON/OFF HEAT COOL COMPARTMENT 1 ON/OFF HEAT COOL COMPARTMENT 2 MANUAL POWERSYSTEM DEFROST ON/OFF 1. Compartment ON/OFF key 6. Up and Down Arrow keys 2. Control panel power on light 7. Heating operating mode light of a compartment 3.
  • Page 62 3. Press host compartment UP arrow key for 10 seconds. P1 is displayed in all compartments. 4. Set lowest set point temperature required. 5. Press Carrier logo and P2 is displayed. Set next lowest temperature required up to five preset set points are available.
  • Page 63 5. Press the UP arrow key on remote compartments will display the presets, take the temperature to the lowest possible, and OFF is displayed. 6. Press the Carrier logo for 10 seconds and the new information is stored in memory. e. Locking the Control Panel 1.

  • Page 64: 3.15 Modes Of Operation

    3.15 MODES OF OPERATION 3.15.1 Heat/Cool Mode Once the engine is considered to be running, the unit microprocessor maintains the set point temperature by switching between heat and cool modes. 3.15.2 Defrost Cycle Defrost is an independent cycle that overrides cooling and heating functions, and de-ices the evaporator(s) as required.

  • Page 65: Table 3-8 Engine Coolant Temperature Glow Time

    b. Auto Start Sequence (Engine Mode) On initial power up, there is a five-second delay before the starting sequence begins. When starting conditions are met, the start sequence begins by energizing the run relay, defrost relay, main heat relay, all hot gas and cool relays, and the unloader.

  • Page 66: 3.16 Pre Trip Inspection

    g. Battery Voltage Provisions are made to sense when the battery is good. A good battery is defined as having 13.4 volts at 75°F (24°C). This condition is used to allow shut-off of the diesel engine. If the battery voltage falls below 10 volts during glow cycle, the starter will not engage and the start sequence will continue.

  • Page 67: After Starting Refrigeration Unit

    10. Check engine air cleaner for cleanliness and condition of air cleaner hose. 11. Check defrost drain pan hoses (should be clear of debris). 3.16.2 After Starting Refrigeration Unit 1. Check engine speed. 2. Listen for abnormal noises. If present, control compressor pressures with a manometer. 3.

  • Page 69: Control Logic And Temperature Control

    SECTION 4 CONTROL LOGIC AND TEMPERATURE CONTROL MODES OF OPERATION 4.1.1 Introduction The operational software responds to various inputs. These inputs come from the temperature and pressure sen- sors, the temperature set point, the settings of the configuration variables and the function code assignments. The action taken by the operational software will change if any one of the inputs changes.

  • Page 70: Logic

    4.1.3 Logic Supra 950MT units are equipped with an 05G compressor with one unloader for capacity control. The capacity- controlled cylinders are easily identified by the solenoid, which extends from the side of the cylinder head. When the solenoid is energized, two cylinders are unloaded (operating with no pressure differential) and absorbed power decreases.

  • Page 71: Lead Compartment Decision

    b. STANDBY Mode Automatic Start: The DER is energized via N2 output. • Prevents activation of engine run solenoid and fuel pump • Standby motor contactor is energized The RR is energized. Electrical power is supplied to the standby motor for starting. c.

  • Page 72: Figure 4.2 Perishable Continuous Mode - Normal (Non-Lead)

    Figure 4.2 Perishable Continuous Mode - Normal (Non-Lead) 6 Cyl. Cool 2.7 F (1.5 C) 2.3 F (1.3 C) 6 Cyl. Cool or Pulsed Cool 1.8 F (1.0 C) 3.6 F (0.8 C) Null Set point Null 0.5 F ( 0.3 C) 0.9 F ( 0.5 C) Electric or 4 (Only one mode allowed)

  • Page 73: Figure 4.4 Frozen Continuous Mode

    Figure 4.4 Frozen Continuous Mode 6 Cyl. Cool 3.6 F (2.0 C) 3.6 F (0.8 C) 4 Cyl. Cool 1.8 F (0.5 C) Null Set point Null 5.4 F ( 3.0 C) 7.2 F ( 4.0 C) Electric and/or 6 Cyl.

  • Page 75: Service

    SECTION 5 SERVICE WARNING Beware of V-belts and belt-driven components as the unit may start automatically. Before ser- vicing unit, make sure the RUN/STOP switch is in the STOP position. Also disconnect the neg- ative battery cable. CAUTION In units with R404A and POE oil, the use of inert gas brazing procedures is mandatory, other- wise compressor failure will occur.

  • Page 76: Table 5-1 Service Category Descriptions

    Table 5–1 Service Category Descriptions Service A 1. Check engine cooling system. 2. Check and clean air filter. 3. Check all belts. 4. Check all hardware and unit mounting bolts for tightness. Tighten as required. 1. Change lube oil and filter(s). 2.

  • Page 77: Servicing Engine-Related Components

    SERVICING ENGINE-RELATED COMPONENTS 5.2.1 Cooling System The condenser and radiator can be cleaned at the same time. The radiator must be cleaned internally as well as externally to maintain adequate cooling. The condenser and radiator are incorporated into a single assembly. The condenser fans draw the air through the con- denser and radiator coil.

  • Page 78: Changing Lube Oil And Lube Oil Filters

    b. Replacing Coolant WARNING Coolant is an acid base liquid and harmful for human contact. Wear proper protective gear: chemical-safe gloves and eye protection when working with refrigerant. Allow time for coolant to cool and for pressure to release before the cap is removed from the radiator. 1.

  • Page 79: Replacing Solenoid

    Figure 5.2 Fuel Filter and Fuel Circuit Restrictor Fitting Return Tube Injection Pump Bleed Port Fuel Filter Fuel Pump Injectors Supply line Return line a. Checking Fuel Circuit 1. The engine must run with the bleed port slightly unscrewed. This indicates that injection pump pressure is greater than 0.1 bars.

  • Page 80: Servicing Fuel Pump

    b. Air Filter Service Procedure Stop engine, remove air filter, and install new air filter. 5.2.5 Servicing Fuel Pump a. To check or to replace fuel pump: 1. Remove three screws from cover (refer to Figure 5.3). 2. Remove cover, gasket, and filter. 3.

  • Page 81: Clutch Control

    1. Disconnect the three capacitors that are connected to the three phases as these will change the readings for some of the tests. Do not reconnect the capacitors until testing is complete. Inspect and tighten all con- nections at the contactor, overload, standby motor, and fuse block before proceeding with this test proce- dure.

  • Page 82: Servicing And Adjusting V-Belts Warning

    Brushes (every 5,000 hours) • Ensure battery terminals and alternator exciting cable are disconnected • Remove the two screws holding the regulator • Replace the brushes • Reassemble the regulator SERVICING AND ADJUSTING V-BELTS WARNING Beware of unannounced starting of the fans and V-belts caused by the thermostat and the start/stop cycling of the unit that may start automatically.

  • Page 83: Water Pump V-Belt

    5.3.4 Water Pump V-Belt WARNING Beware of moving poly V-Belt. WARNING When working with belts, beware of pinch points. The water pump v-belt is driven by a sheave on the engine crankshaft. Frayed, cracked or worn belts must be replaced. This belt requires no tension adjustment. To Replace the Poly V-belt: a.

  • Page 84: Pumping Down The Unit

    5.4.1 Pumping Down the Unit To service the filter drier, expansion valve, CPR valve, or evaporator coil, pump most of refrigerant into condenser coil and receiver as follows: a. Close (backseat) suction and discharge service valve (turn counterclockwise) to close off gauge connection and attach manifold gauges to valves.

  • Page 85: Procedure For Evacuating And Dehydrating System

    b. Essential tools to properly evacuate and dehydrate any system include a good vacuum pump (5 cfm = 8m-H vol- ume displacement, P/N 07-00176-01) and a good vacuum indicator such as a thermocouple vacuum gauge (vacuum indicator). NOTE The use of a compound gauge is not recommended due to its inherent inaccuracy. c.

  • Page 86: Charging The Refrigerant System

    Figure 5.7 Dual Vacuum Pump Connections 1. Evaporator Coil 6. Suction Service Valve 2. Condenser Coil 7. Evacuation Manifold 3. Receiver 8. Vacuum Pump 4. King Valve 9. Vacuum Meter 5. Discharge Service Valve - - - - - CHARGING THE REFRIGERANT SYSTEM 5.7.1 Installing a Complete Charge a.

  • Page 87: Replacing The Compressor

    REPLACING THE COMPRESSOR a. Removing the Compressor If compressor is inoperative and unit still has refrigerant pressure, frontseat suction and discharge service valves to trap most of the refrigerant in the unit. If compressor runs, pump down the unit (refer to Section 5.4).

  • Page 88: Compressor Oil Level

    Oil Pump Method While Carrier does not provide an oil pump with the 950MT, there are a number of commercially-available pumps, including a Robinair refrigerant oil pump (part number 14388), that can be used. This pump adapts to a one U.S.

  • Page 89: Removing Oil From The Compressor

    5.9.4 Removing Oil from the Compressor a. Close suction service valve (frontseat) and pump unit down to 2 to 4 psig (0.1 to 0.3 kg/cm). Frontseat dis- charge service valve and slowly bleed remaining refrigerant. b. Remove the oil drain plug from compressor and drain the proper amount of oil from the compressor. Replace the plug securely back into the compressor.

  • Page 90: 5.11 Checking And Replacing Filter Drier

    Figure 5.9 Unloader Solenoid Valve 1. Coil Assembly 8. Gasket 2. Installation/removal tool 9. Valve body 3. Enclosing tube Collar 10. Gasket 4. O-ring 11. Bolt 5. Enclosing tube 12. Gasket, bolt 6. Plunger spring 13. Piston ring 7. Plunger assembly - - - - - 5.11 CHECKING AND REPLACING FILTER DRIER Two Methods:...

  • Page 91: 5.13 Replacing Receiver Sight Glass Assembly

    Figure 5.10 Typical Setup for Testing High Pressure Switch 1. Cylinder valve and gauge 4. Pressure gauge (0 to 500 psig = 0 to 227 kg/cm 2. Pressure regulator 5. Bleed-Off valve 3. Nitrogen cylinder 6. 1/4 inch connection - - - - - a.

  • Page 92: 5.14 Coil Cleaning

    5.14 COIL CLEANING 5.14.1 Evaporator Coil The use of recycled cardboard cartons is increasing across the country and these cartons create much more fiber dust during transport than new cartons. The fiber dust and particles are drawn into the evaporator where they lodge between the evaporator fins.

  • Page 93: 5.16 Thermostatic Expansion Valve

    The Genesis-style remote evaporators supplied with the current Supra 950MT units have the expansion valve superheat set at a nominal setting for average installations. Figure 5.13 Thermostatic Expansion Valve Bulb and Thermocouple...

  • Page 94: Replacing Expansion Valve

    Table 5–3 Optimum Operating Superheat Temperature Refrigerant Pressure and Type Operating Superheat (°F) R-22 (Psig) R404A (Psig) 34° 60.2 76.5 35° 61.5 78.1 36° 62.9 79.7 37° 64.3 81.3 38° 65.7 83.0 39° 67.1 84.7 40° 68.6 86.4 41° 70.0 88.1 42°...

  • Page 95: 5.17 Suction Pressure Transducer

    5.17 SUCTION PRESSURE TRANSDUCER Before a new suction pressure transducer can be installed, it must be calibrated. The calibration will not be performed if the run relay is energized. This prevents the operator from calibrating the unit with the sensor in the system. The reading of the sensor must be at atmospheric pressure (0 psig or 14.7 psi). If the sensor reading is greater than 20 psig (34.7 psi) or less than -6.7 psig (8 psi), it cannot be calibrated.

  • Page 96: Table 5-5 R404A Temperature-Pressure Chart

    Table 5–5 R404A Temperature-Pressure Chart Temperature Pressure Temperature Pressure °F °C Psig Kg/cm °F °C Psig Kg/cm 0.32 0.31 72.5 5.10 5.00 0.50 0.49 75.6 5.32 5.21 0.70 0.68 78.8 5.54 5.43 12.9 0.91 0.89 82.1 5.77 5.66 16.3 1.15 1.12 85.5 6.01...

  • Page 97: 5.18 Microprocessor

    Under no circumstances should 12 VDC be applied at these connection points. Grounded wrist cuffs are available from Carrier (P/N 07-00304-00). It is recommended that these be worn when- ever handling a microprocessor.

  • Page 98: Microprocessor Replacement And Configuration Service Guidelines

    5.18.1 Microprocessor Replacement and Configuration Service Guidelines a Removing and Replacing the Microprocessor Logic Board: 1. Before removing the microprocessor, disconnect the negative battery cable and attach a grounded wrist strap (07-00304-00) to your wrist and ground it to a good unit frame ground. 2.

  • Page 99: Table 5-7 Microprocessor Configurations

    Table 5–7 Microprocessor Configurations Microprocessor Description Supra 950MT DI engine long glow cycle CNF1: (DI/TV) TV engine short glow cycle CDT not used CNF2: (ON/OFF) CDT used 86°F (30°C) Maximum set point CNF3: (ON/OFF) 90°F (32°C) Maximum set point Heat lockout on 10°F (-12°C)

  • Page 101: Troubleshooting

    SECTION 6 TROUBLESHOOTING CAUTION Under no circumstances should anyone attempt to service the microprocessor! Should a prob- lem develop with the microprocessor, contact your nearest Carrier Transicold dealer for replacement. DIESEL ENGINE INDICATION / TROUBLE POSSIBLE CAUSES REFERENCE 6.1.1 Engine Will Not Start...

  • Page 102: Starter Motor Malfunction

    6.1.3 Starter Motor Malfunction Starter motor will not Battery insufficiently charged Check crank or turns slowly Battery cable connections loose or oxidized Check Battery cables defective Replace Starter brushes shorted out Engine Manual Starter brushes hang up or have no contact Engine Manual Starter solenoid damaged Engine Manual...

  • Page 103: Refrigeration

    Excessive charging rate Regulator leads loose, dirty/corroded terminals, or wires Clean/Repair broken Check Defective regulator Noisy alternator Defective or badly worn V-belt Worn bearing(s) Replace Misaligned belt or pulley Loose pulley Tighten REFRIGERATION 6.3.1 Unit Will Not Cool Diesel engine Malfunction(s) Compressor malfunction Compressor drive defective...

  • Page 104: Defrost Cycle Malfunction

    6.3.5 Defrost Cycle Malfunction Will not initiate defrost auto- Defrost thermostat (DTT) open or defective Replace matically Loose terminal connections Tighten Check the selected Defrost Interval Check Will not initiate defrost manual- Microprocessor or Cab Command defective Replace Loose terminal connections Tighten Defrost thermostat (DTT) open or defective Replace...

  • Page 105: Abnormal Pressure, Heating

    6.3.7 Abnormal Pressure, Heating High discharge pressure Overcharged system 5.4.1 V-belts broken or loose Non-condensibles or refrigerant overcharge Replace Main heat valve (MHV) malfunction Check Hot gas valve (1HGV or 2HGV) malfunction 6.3.11 Compressor gaskets defective Check Low discharge pressure Compressor valve(s) worn or broken Main heat valve (MHV) malfunction Check...

  • Page 106: Expansion Valve Malfunction

    6.3.11 Expansion Valve Malfunction Low suction pressure with high Low refrigerant charge superheat External equalizer line plugged Clean Ice formation at valve seat Wax, oil or dirt plugging valve or orifice 5.16 Broken capillary 5.16 Power assembly failure or partial Replace Loss of element/bulb charge Replace...

  • Page 107: Electrical Schematic Wiring Diagram

    Under no circumstances should ether or any other starting aids be used to start engine. CAUTION Under no circumstances should anyone attempt to repair the Logic or Display Boards! Should a problem develop with these components, contact your nearest Carrier Transicold dealer for replacement. CAUTION Observe proper polarity when installing battery, negative battery terminal must be grounded.
  • Page 108 wiring schematics Based on Drawing 62 04104 ART Figure 8-1. Electrical Schematic Wiring Diagram (Sheet 1 of 2)
  • Page 109 Based on Drawing 62 04104 ART Figure 8-2. Electrical Schematic Wiring Diagram (Sheet 2 of 2)

  • Page 113: Index

    INDEX Drive Equipment, Clutch Assembly 2-10 Drive Equipment, Engine 2-10 Accumulator 2-15 Drive Equipment, Standby Motor/Generator 2-10 Adding Oil to Service Replacement Compressor 5-14 Adding Oil with Compressor in System 5-14 Adjusting the Compressor Pressure Regulating Valve Electric and Electric Hot/Gas Heat 2-16 (CPR) 5-18 Electric Evaporator Fan Motor 2-16...
  • Page 114 Servicing Glow Plugs Setting and Adjusting Superheat 5-19 Pre Trip Inspection 3-24 Solenoid Coil Replacement 5-15 Principle of Induction Heating (Electric Heat) 2-22 Standby Motor Procedure for Evacuating and Dehydrating 5-11 Start / Stop Operation Pulse Sequence Starting Unit - Electric Standby Operation 3-4 Pumping Down the Unit 5-9 Starting Unit - Engine / Road Operation 3-3 Stopping Unit...
  • Page 116 State of California to cause cancer, birth defects, and other reproductive harm. North America Central America and Mexico Carrier Transicold Ejercito Nacional 253−A Piso 5 700 Olympic Drive Colonia Anahuac Athens, GA 30601 USA 11320 Mexico, D.F.

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