Carrier Transicold Container Refrigeration Model 69NT20-531-300 Streamline Scroll Operation & Service T-309 Rev A
OPERATION AND SERVICE MANUAL CONTAINER REFRIGERATION UNIT MODEL 69NT20-531-300 Streamline Scroll Carrier Transicold. A member of the United Technologies Corporation family. Stock symbol UTX. Carrier Transicold Divsion, Carrier Corporation, P.O. Box 4805, Syracuse, N.Y. 13221 U. S. A. ã 2002 CarrierCorporation D Printed in U. S. A.
SAFETY SUMMARY GENERAL SAFETY NOTICES The following general safety notices supplement the specific warnings and cautions appearing elsewhere in this manual. They are recommended precautions that must be understood and applied during operation and maintenance of the equipment covered herein. The general safety notices are presented in the following three sections labeled: First Aid, Operating Precautions and Maintenance Precautions.
WARNING Make sure that the unit circuit breaker(s) (CB-1 & CB-2) and the START-STOP switch (ST) are in the “O” (OFF) position before connecting to any electrical power source. WARNING Never use air for leak testing. It has been determined that pressurized, mixtures of refrigerant and air can undergo combustion when exposed to an ignition source. WARNING Make sure power to the unit is OFF and power plug disconnected before replacing the compressor.
CAUTION When Pre-Trip key is pressed, economy, dehumidification and bulb mode will be deactivated. At the completion of Pre-Trip activity, economy, dehumidification and bulb mode must be reactivated. CAUTION When a failure occurs during automatic testing the unit will suspend operation awaiting operator intervention. CAUTION When Pre--Trip test Auto 2 runs to completion without being interrupted, the unit will terminate pretrip and display “Auto 2” “end.
TABLE OF CONTENTS PARAGRAPH NUMBER Page GENERAL SAFETY NOTICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FIRST AID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OPERATING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MAINTENANCE PRECAUTIONS . . . . . . . . . . . . . . . . . . .
TABLE OF CONTENTS (cont) 2.5.1 Standard Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 2.5.2 Economized Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 2.5.3 Unloaded Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 MICROPROCESSOR . . . . . . . . . . . . . . .
TABLE OF CONTENTS (cont) OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 4.2 INSPECTION (Before Starting) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONNECT POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.1 Connection To 380/460 vac Power .
TABLE OF CONTENTS (cont) SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6.1 SECTION LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 SERVICE VALVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3. MANIFOLD GAUGE SET .
6.21.1 Handling Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.21.2 Controller Trouble-Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.21.3 Controller Programming Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.21.4 Removing and Installing a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LIST OF ILLUSTRATIONS FIGURE NUMBER Page Figure 2-1 Refrigeration Unit -- Front Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2-2 Evaporator Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2-3 Compressor Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2-4 Condenser Section .
LIST OF ILLUSTRATIONS FIGURE NUMBER Page Figure 6-22 Return Sensor Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 6-23 Door Hinge Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 6-24. Insert Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 6-25.
SECTION 1 INTRODUCTION 1.1 INTRODUCTION 1.3.1 Battery The Carrier Transicold model 69NT20--531-300 units are of lightweight aluminum frame construction, designed to fit in the front of a container and serve as the container front wall. They are one piece, self-contained, all electric units which are fitted with cooling and heating systems to provide precise temperature control. The controller may be fitted with standard replaceable batteries or a rechargeable battery pack.
1.3.11 460 Volt Cable Various power cable and plug designs are available for the main 460 volt supply. The plug options tailor the cables to each customers requirements. example, additional operating instructions are required to describe start--up of a unit equipped with an autotransformer. Where the labels are available with additional languages, they are listed in the parts list. 1.3.12 Cable Restraint 1.3.17 Plate Set Various designs are available for storage of the power cables.
SECTION 2 DESCRIPTION 2.1 GENERAL DESCRIPTION valve, suction modulation valve and evaporator coil heaters. The unit model number, serial number and parts identification number can be found on the serial plate to the left of the economizer. 2.1.1 Refrigeration Unit -- Front Section The unit is designed so that the majority of the components are accessible from the front, see Figure 2-1.
2.1.3 Evaporator Section The evaporator fans circulate air through the container by pulling it in the top of the unit, directing it through the evaporator coil, where it is heated or cooled, and discharging it at the bottom.
2.1.4 Compressor Section transducer, discharge temperature sensor and the suction pressure transducers. The compressor section includes the compressor (with high pressure switch) and the oil separator. This section also contains the oil return solenoid, compressor power plug, the discharge pressure The supply temperature sensor, supply recorder sensor and ambient sensor are located at the left side of the compressor.
2.1.5 Air Cooled Condenser Section The condenser fan pulls air in the bottom of the coil and it is discharged horizontally out through the condenser fan grille. This section also contains the economizer, economizer solenoid valve, economizer expansion valve and the liquid injection solenoid valve. The air cooled condenser section (Figure 2-4) consists of the condenser fan, condenser coil, receiver, sight glass/moisture indicator, liquid line service valve, filter-drier and fusible plug.
2.1.6 Control Box Section 2.1.7 Communications Interface Module The control box (Figure 2-5) includes the manual operation switches; circuit breaker (CB-1); compressor, fan and heater contactors; control power transformer; fuses; key pad; display module; current sensor module; controller module expansion module and the communications interface module. The communications interface module is a slave module which allow communication with a master central monitoring station.
2.2 REFRIGERATION SYSTEM DATA a Compressor/Motor a. Assembly y Model Weight (Dry) Approved Oil Oil Charge RSH105 46.5 kg (103 lb) Mobil ST32 2957 ml (100 ounces) The oil level range, with the compressor off, should be between the bottom and one-eighth level of the sight glass. Oil Sight Glass b. Evaporator Expansion Valve Superheat Verify at --18 _C (0 _F) container box temperature c. Economizer Expansion Valve Superheat d Heater Termination Thermostat d. e High Pressure Switch e. f.
2.3 ELECTRICAL DATA CB-1 Trips at CB-2 (50 amp) Trips at a. Circuit Breaker CB-2 (70 amp) Trips at b. Compressor Full Load Amps (FLA) Motor c. Condenser Fan Motor d. Evaporator Coil Heaters e. Evaporator Fan Motor(s) f.
PARAGRAPH 2.3 -- Continued Orange wire Power Red wire Output Brown wire Ground Input voltage 5 vdc Output voltage 0 to 3.3 vdc g Humidity Sensor g. Output voltage readings verses relative humidity (RH) percentage: 30% 0.99 V 50% 1.65 V 70% 2.31 V 90% 2.97 V 2.4 SAFETY AND PROTECTIVE DEVICES IP-CP or HPS will shut down the compressor. Unit components are protected from damage by safety and protective devices listed in the following table.
2.5 REFRIGERATION CIRCUIT 2.5.2 Economized Operation 2.5.1 Standard Operation In the economized mode the frozen range and pull down capacity of the unit is increased by subcooling the liquid refrigerant entering the evaporator expansion valve. Overall efficiency is increased because the gas leaving the economizer enters the compressor at a higher pressure, therefore requiring less energy to compress it to the required condensing conditions.
STANDARD OPERATION WITH RECEIVER EVAPORATOR LOW SIDE ACCESS VALVE TXV BULB SMV TXV CONDENSER USV LIV STS ECONOMIZER TXV BULB FILTER DRIER ECONOMIZER DISCHARGE SERVICE CONNECTION DPT CPDS ESV HPS OIL SEPARATOR RECEIVER ECONOMIZER TXV ECONOMIZER SERVICE CONNECTION ORV FUSIBLE PLUG SUCTION SERVICE CONNECTION SIGHT GLASS MOISTURE INDICATOR OIL RETURN SERVICE VALVE LIQUID LINE SERVICE CONNECTION SPT COMPRESSOR DISCHARGE LIQUID SUCTION STANDARD OPERATION WITH WATER COOLED CONDENSER EVAP
EVAPORATOR LOW SIDE ACCESS VALVE TXV BULB SMV TXV CONDENSER LIV ECONOMIZER TXV BULB ECONOMIZER ESV OIL SEPARATOR ECONOMIZER SERVICE CONNECTION ECONOMIZER TXV RECEIVER LIQUID LINE SERVICE CONNECTION LIQUID ECONOMIZER PRESSURE Figure 2-7 Refrigeration Circuit Schematic -- Economized Operation SMV TXV BULB TXV USV LIV ECONOMIZER TXV BULB OIL SEPARATOR SUCTION SERVICE CONNECTION RECEIVER LIQUID ECONOMIZER PRESSURE SUCTION Figure 2-8 Refrigeration Circuit Schematic -- Unloaded Operation 2-
SECTION 3 MICROPROCESSOR 3.1 TEMPERATURE CONTROL MICROPROCESSOR SYSTEM record unit operating parameters and cargo temperature parameters for future retrieval. Coverage of the temperature control software begins with paragraph 3.2. Coverage of the DataCORDER software is provided in paragraph 3.6. The temperature control Micro-Link 2i microprocessor system (see Figure 3- 1) consists of a key pad, display module, the control module & expansion module set (controller) and interconnecting wiring.
Table 3-1 Key Pad Function FUNCTION KEY Code Select Accesses function codes. Displays the pre-trip selection menu. DisPre-Trip continues pre-trip in progress. Displays alarm list and clears the alarm Alarm List queue. Defrost Displays selected defrost interval. Interval Confirms a selection or saves a selection Enter to the controller. Change or scroll a selection upward PreArrow Up trip advance or test interruption. Arrow Change or scroll a selection downward. Down Pre-trip repeat backward.
1 1 3 2 9 3 3 3 4 5 3 3 3 6 7 3 8 3 3 1. 2. 3. 4. 5. Mounting Screw 6. Control Circuit Power Connection Micro-Link 2i Control/DataCORDER Module (Location: In back of controller) Connectors 7. Software Programming Port Test Points 8. Battery Pack Fuses 9. Expansion Module Figure 3- 4 Control and Expansion Modules 3.1.3 Controller c. Provide ability to read and (if applicable) modify the Configuration Software Variables, Operating Software Function Codes and Alarm Code Indications.
3.3.2 Defrost Interval 3.2.2 Operational Software (Function codes) Function code Cd27 may be operator set to initiate defrost at intervals of 3, 6, 9, 12 or 24 hours. It may also be set to OFF (no defrost). The factory default is 12 hours. (Refer to Table 3-5). The Operational Software is the actual operation programming of the controller which activates or deactivates components in accordance with current unit operating conditions and operator selected modes of operation. 3.3.
mode and the heaters will be energized . The unit will transition back to the perishable idle mode when the temperature rises to 0.2_C (0.4_F) below the set point and the heaters will de-energize causes the controller to open the suction modulating valve to match the increased heat load while still holding the supply air temperature very close to the set point.
1. Bulb mode code Cd35 is set to “Nor.” to “ON”. When economy mode frozen is active, the system will perform normal frozen mode operations except that the entire refrigeration system, excluding the controller, will be turned off when the control temperature is less than or equal to the set point -- 2_C. After an off-cycle period of 60 minutes, the unit will turn on high speed evaporator fans for three minutes, and then check the control temperature.
e. “END” is displayed to indicate the end of the alarm list if any alarms are active. f. “CLEAr” is displayed if all alarms are inactive. The alarm queue may than be cleared by pressing the ENTER key. The alarm list will clear and “ -- -- -- -- -- ” will be displayed. 3.6 DataCORDER The DataCORDER performs the following functions: a. Logs data at 15, 30, 60 or 120 minute intervals and stores two years’ of data (based on one hour interval). b. Records and displays alarms on the display module. c.
Table 3-2 DataCORDER Configuration Variables CONFIGURATION NO.
Raw Data Report for ABC1234567 May 31, 2001 to Jun 04, 2001 System Configuration at the Time of Interrogation: Interrogated On Sept 05, 2001 Extracted by DataLine Rev 1.0.0 Controller Software: 5120 Controller Serial #: 04163552 Bill of Lading #: 1 Origin: Origin Date: Destination: Discharge Date: Comment: DataLine Tool Probe Calibration Readings: USDA1: 0.0 USDA2: 0.0 USDA3: 0.0 Cargo: 0.
3.6.4 Logging Interval (dCF03) 2. Controller DC battery pack power: If a battery pack is installed, the DataCORDER will power up for communication when an interrogation cable is plugged into an interrogation receptacle. The user may select four different time intervals between data recordings. Data is logged at exact intervals in accordance with the real time clock. The clock is factory set at Greenwich Mean Time (GMT). 3.6.
Exposing infested fruit to temperatures of 2.2 degrees Celsius (36_F) or below for specific periods results in the mortality of the various stages of this group of insects. In response to the demand to replace fumigation with this environmentally sound process, Carrier has integrated Cold Treatment capability into its microprocessor system.
have to be inactive in order to clear the alarm list. To Clear the Alarm List: Place in pulp of the product located next to the return air intake. Place in pulp of the product five feet from the end of the load for 40 foot conSensor 2 tainers, or three feet from the end of the load for 20 foot containers. This probe should be placed in a center carton at one-half the height of the load.
Table 3-4 Controller Configuration Variables NOTES 1. Configuration numbers not listed are not used in this application. These items may appear when loading configuration software to the controller but changes will not be recognized by the controller programming.
Table 3-5 Controller Function Codes (Sheet 1 of 3) Code No. TITLE DESCRIPTION Note: If the function is not applicable, the display will read “-- -- -- -- -- ” Display Only Functions Displays the SMV percent open. The right display reads 100% when the valve is fully open. The valve will usually be at 10% on start up of the unit except in very high ambient temperatures. Not Applicable Not used The current sensor measures current draw in lines L1 & L2 by all of the high Compressor Motor voltage components.
Table 3-5 Controller Function Codes (Sheet 2 of 3)ff Cd22 Compressor State Cd23 Evaporator Fan Cd24 Controlled Atmosphere State Compressor Run Cd25 Time Remaining Until Defrost Cd26 Defrost Temperature Sensor Reading The status of the compressor is displayed (Off, On). Displays the current evaporator fan state (high, low or off). Not used in this application This code displays the time remaining until the unit goes into defrost (in tenths of an hour).
Table 3-5 Controller Function Codes (Sheet 3 of 3) Cd31 Stagger Start Offset Time (Seconds) Cd32 Current Limit (Amperes) Perishable Mode Cd33 Dehumidification Control (% RH) Cd34 Economy Mode (On--Off) Cd35 Bulb Mode Cd36 Evaporator Speed Select Defrost Termination Cd37 Temperature Setting (Bulb Mode) The stagger start offset time is the amount of time that the unit will delay at startup, thus allowing multiple units to stagger their control initiation when all units are powered up together.
Table 3-6 Controller Alarm Indications (Sheet 1 of 4) Code No. TITLE DESCRIPTION Alarm 13 is triggered if the control module has lost communication with the expansion module for more than five minutes or communication fails within the first 15 seconds on power up. This alarm triggers failure action C (evaporator fan AL13 Expansion Module only) or D (all machinery off) of Function Code Cd29 if the unit has a perishable set point.
Table 3-6 Controller Alarm Indications (Sheet 2 of 4) AL25 AL26 AL27 AL28 AL51 AL52 AL53 AL54 Alarm 25 is triggered by the opening of the condenser motor internal protector and will disable all control units except for the evaporator fans. This alarm will Condenser Fan Mo- remain active until the motor protector resets. This alarm triggers failure action tor Safety C (evaporator fan only) or D (all machinery off) of Function Code Cd29 if the unit has a perishable set point.
Table 3-6 Controller Alarm Indications (Sheet 3 of 4) Primary Return AL56 Temperature Sensor Failure (RTS) Alarm 56 is activated by an invalid primary return temperature sensor reading that is outside the range of --50 to +70_C (--58_F to +158_F). If Alarm 56 is activated and the primary return is the control sensor, the secondary return sensor will be used for control if the unit is so equipped.
Table 3-6 Controller Alarm Indications (Sheet 4 of 4) NOTE If the Controller is configured for four probes without a DataCORDER, the DataCORDER alarms AL70 and AL71 will be processed as Controller alarms AL70 and AL71. Refer to Table 3-10. The Controller performs self-check routines. if an internal failure occurs, an “ERR” alarm will appear on the display. This is an indication the Controller needs to be replaced.
Table 3-7 Controller Pre-Trip Test Codes (Sheet 1 of 4) Code No. TITLE DESCRIPTION NOTE “Auto” or “Auto1” menu includes the: P0, P1, P2, P3, P4, P5, P6 and rSLts. “Auto2” menu includes P0, P1, P2, P3, P4, P5, P6, P7, P8, P9, P10 and rSLts. All lights and display segments will be energized for five seconds at the start of P0--0 Pre-Trip Initiated the pre-trip. Since the unit cannot recognize lights and display failures, there are no test codes or results associated with this phase of pre-trip.
Table 3-7 Controller Pre-Trip Test Codes (Sheet 2 of 4) Requirements: For units equipped with secondary supply probe only. Pass/Fail Criteria: The temperature difference between primary and secondary probe (supply) is compared. P5-1 Supply Probe Test P5-2 Return Probe Test NOTE If this test fails, “P5-1” and FAIL will be displayed. If both Probe tests (this and the SUPPLY/ RETURN TEST) pass, because of the multiple tests, the display will read ’P 5’ ’PASS’.
Table 3-7 Temperature Controller Pre-Trip Test Codes (Sheet 3 of 4) P7-0 High g Pressure S it h Closed Switch Cl d P7-1 High Pressure Switch Open P8-0 Perishable Mode Heat Test P8-1 Perishable Mode Pull Down Test P8-2 Perishable Mode Maintain Temperature Test P9-0 Defrost Test NOTE P7-0 through P10 are included with the “Auto2” only. NOTE This test is skipped if the sensed ambient temperature is less than 7_C (45_F), the return air temperature is less than --17.
Table 3-7 Controller Pre-Trip Test Codes (Sheet 4 of 4) P10-0 Frozen Mode Heat Test P10-1 Frozen Mode Pull Down Test P10-2 Frozen Mode Maintain Temperature Test T-309 Setup: If the container temperature is below 7.2_C (45_F), the set point is changed to 7.2_C and a 180 minute timer is started. The control will then be placed in the equivalent of normal heating. If the container temperature is above 7.2_C at the start of the test, then the test proceeds immediately to test 10--1.
Table 3-8 DataCORDER Function Code Assignments NOTE Inapplicable Functions Display “ -- -- -- -- -- ” To Access: Press ALT. MODE key Code No. dC1 dC2 dC3-5 dC6-13 TITLE Recorder Supply Temperature Recorder Return Temperature USDA 1,2,3 Temperatures Network Data Points 1-8 Cargo Probe 4 Temperature dC15-19 Future Expansion dC14 DESCRIPTION Current reading of the supply recorder sensor. Current reading of the return recorder sensor. Current readings of the three USDA probes.
Table 3-9 DataCORDER Pre-Trip Result Records Test No.
Table 3-10 DataCORDER Alarm Indications Code No. dAL70 TITLE Recorder Supply Temperature Out of Range To Access: Press ALT. MODE key DESCRIPTION The supply recorder sensor reading is outside of the range of --50_C to 70_C (--58_F to +158_F) or, the probe check logic has determined there is a fault with this sensor. NOTE The P5 Pre-Trip test must be run to inactivate the alarm.
SECTION 4 OPERATION 4.1 INSPECTION (Before Starting) 4.3 ADJUST FRESH AIR MAKEUP VENT WARNING Beware of unannounced starting of the evaporator and condenser fans. The unit may cycle the fans and compressor unexpectedly as control requirements dictate. a. If container is empty, check inside for the following: 1. Check channels or “T” bar floor for cleanliness. Channels must be free of debris for proper air circulation. 2. Check container panels, insulation and door seals for damage.
4.4 CONNECT REMOTE MONITORING RECEPTACLE 1. Depress the ALT MODE key and scroll to Code dC30. If remote monitoring is required, connect remote monitor plug at unit receptacle. (See item 9, Figure 2-5.) When the remote monitor plug is connected to the remote monitoring receptacle, the following remote circuits are energized: 2. Depress and hold the ENTER key for five seconds. 3. The “Trip Start” event will be entered in the DataCORDER. CIRCUIT Sockets B to A Sockets C to A Sockets D to A 4.6.
3. Pre-trip the three minute time period expires, the unit will terminate pre-trip and return to control mode operation. 2. While the tests are being executed, the user may terminate the pre-trip diagnostics by pressing and holding the PRE-TRIP key. The unit will then resume normal operation. If the user decides to terminate a test but remain at the test selection menu, the user may press the UP ARROW key.
1. At every power up. Any probe(s) determined to be outside the limits will cause the appropriate alarm code(s) to be displayed to identify which probe(s) needs to be replaced. The P5 Pre-Trip test must be run to inactivate alarms. 2. At the end of every defrost. 3. After every diagnostic check that does not fall outside of the limits as outlined above. 4.9 SEQUENCE OF OPERATION d. Probe Check General operation sequences for cooling, heating and defrost are provided in the following subparagraphs.
FALLING TEMPERATURE RISING TEMPERATURE START UNLOADED, TRANSITION TO ECONOMIZED OPERATION COOLING ECONOMIZED +.20_C SET POINT --0.20_C AIR CIRCULATION AIR CIRCULATION NOTE: TEMPERATURES INDICATIONS ARE ABOVE OR BELOW SET POINT Figure 4-3 Controller Operation -- Frozen Mode ENERGIZED DE--ENERGIZED FOR FULL DIAGRAM AND LEGEND, SEE SECTION 7 will switch operation from compressor contactor PB to compressor contactor PA. Compressor contactors PA is wired to run the compressor on L1, L2, and L3.
noid valve changing from economized operation to unloaded operation. (As shown in Figure 4-5) rator fans continue to run to circulate air throughout the container. c. A safety heater termination thermostat (HTT), attached to an evaporator coil support, will open the heating circuit if overheating occurs. d. The controller monitors the supply air. Once the supply air falls below set point the controller periodically records the supply air temperature, set point and time.
Defrost may be initiated by any one of the following methods: 1. The manual defrost switch (MDS) is closed by the user. 2. The user sends a defrost command by communications. 3. The defrost interval timer (controller function code Cd27) reaches the defrost interval set by the user. 4. The controller probe diagnostic logic determines that a probe check is necessary based on the temperature values currently reported by the supply and return probes. 5.
SECTION 5 TROUBLESHOOTING CONDITION POSSIBLE CAUSE REMEDY/ REFERENCE SECTION 5.
CONDITION POSSIBLE CAUSE REMEDY/ REFERENCE SECTION 5.3 UNIT RUNS BUT HAS INSUFFICIENT COOLING Refrigeration System Abnormal pressures Abnormal temperatures Abnormal currents Controller malfunction Evaporator fan or motor defective Shortage of refrigerant Suction modulation valve lost track of step count Suction modulation valve malfunction Compressor service valves or liquid line shutoff valve partially closed Economizer solenoid valve or TXV malfunction Unloader valve stuck open Frost on coil 5.7 5.
CONDITION POSSIBLE CAUSE REMEDY/ REFERENCE SECTION 5.6 UNIT WILL NOT DEFROST PROPERLY -- Continued Will not initiate defrost manually Manual defrost switch defective Defrost temperature sensor open Replace 4.9.5 Initiates but relay (DR) drops out Low line voltage 2.3 Heater contactor or coil defective Heater(s) burned out Wet load Replace 6.15 Normal Initiates but does not defrost Frequent defrost 5.
CONDITION POSSIBLE CAUSE REMEDY/ REFERENCE SECTION 5.9 CONTROLLER MALFUNCTION Will not control Defective Sensor Defective wiring Fuse (F1, F2, F3) blown Stepper motor suction modulation valve circuit malfunction Low refrigerant charge 6.22 Check Replace 6.20 6.7 5.
CONDITION POSSIBLE CAUSE REMEDY/ REFERENCE SECTION 5.14 COMPRESSOR OPERATING IN REVERSE CAUTION Allowing the scroll compressor to operate in reverse for more than two minutes will result in internal compressor damage. Turn the start--stop switch OFF immediately. Incorrect wiring of compressor Incorrect wiring of compressor contactor(s) Electrical Check Incorrect wiring of current sensor 5.
SECTION 6 SERVICE NOTE To avoid damage to the earth’s ozone layer, use a refrigerant recovery system whenever removing refrigerant. When working with refrigerants you must comply with all local government environmental laws. In the U.S.A., refer to EPA section 608. WARNING Never use air for leak testing. It has been determined that pressurized, mixtures of refrigerant and air can undergo combustion when exposed to an ignition source. 5 4 6.
system can be charged. Oil can also be added to the system. 2. Connect the field service coupling (see Figure 6-4) to the access valve. 3. Turn the field service coupling knob clockwise, which will open the system to the gauge set. 4. To read system pressures: slightly midseat the service valve. 5. Repeat the procedure to connect the other side of the gauge set. A R-134a manifold gauge/hose set with self-sealing hoses (see Figure 6-4) is required for service of the models covered within this manual.
6.6 EVACUATION AND DEHYDRATION gauge. If a vacuum is indicated, emit refrigerant by cracking the liquid line valve momentarily to build up a slight positive pressure. 6.6.1 General Moisture is the deadly enemy of refrigeration systems. The presence of moisture in a refrigeration system can have many undesirable effects. The most common are copper plating, acid sludge formation, “freezing-up” of metering devices by free water, and formation of acids, resulting in metal corrosion. g.
a. Remove all refrigerant using a refrigerant recovery system. b. The recommended method to evacuate and dehydrate the system is to connect evacuation hoses at the compressor suction, compressor economizer and liquid line service valve (see Figure 6-5). Be sure the service hoses are suited for evacuation purposes. c. The area between the suction modulating valve and evaporator expansion valve may not be open to the access valves.
6.7 REFRIGERANT CHARGE e. Start unit in cooling mode. Run approximately 10 minutes and check the refrigerant charge. 6.7.1 Checking the Refrigerant Charge 6.7.3 Adding Refrigerant Charge) to System (Partial a. Examine the unit refrigerant system for any evidence of leaks. Repair as necessary. (Refer to paragraph 6.5.) NOTE To avoid damage to the earth’s ozone layer, use a refrigerant recovery system whenever removing refrigerant.
Table 6-1 Compressor Kit Component Item 1 2 3 4 5 6 7 8 9 10 Qty Compressor Service Valve Seal Mylar Washers Wire Tie Oil Sight Glass Plug Resilient Mount Upper Shock Mount Ring Upper Shock Mount Bushing Compressor Power Plug O--Ring SST Washers SST Washer (Kit Item 10) 1 3 4 2 1 4 1 1 1 8 Resilient Mount (Kit Item 6) SST Washer (Kit Item 10) Mylar Washer (Kit Item 3) Mylar Protector (Retain) c.
5 Turn Start/Stop switch off and allow oil to drain into compressor sump. Oil level must be visible in the sight glass. If it is not visible, oil must be added to the compressor. n. Place the new service seals (kit item 2) at the compressor service ports, connect the four service valves loosely. o. Torque the four resilient mount screws to 6.2 mkg (45 ft--lbs). p. Torque the four service valves to: Service Valve Suction or Discharge Economizer Oil Return b. Adding Oil with Compressor in System 1.
6.10.2 Checking High Pressure Switch c. Unsolder discharge line and remove the line to the receiver or water-cooled condenser. d. Remove coil mounting hardware and remove the coil. e. Install replacement coil and solder connections. f. Leak-check the coil connections per paragraph paragraph 6.5. Evacuate the unit per paragraph 6.6 then charge the unit with refrigerant per paragraph 6.7. WARNING Do not use a nitrogen cylinder without a pressure regulator.
2. Check the moisture-liquid indicator if the indicator shows a high level of moisture, the filter-drier should be replaced. a. Open the heater access panel (see Figure 2-1) to expose the evaporator expansion valve. b. Attach a temperature sensor near the expansion valve bulb and insulate. Make sure the suction line is clean and that firm contact is made with the sensor. b. To Replace Filter-Drier 1. Pump down the unit (refer to paragraph 6.4 and replace filter-drier. c.
Braze Rod (’Sil-Phos” = 5.5% Silver, 6% Phosphorus) Copper Tube (Apply heat for 10-15 seconds) Bi-metallic Tube Connection (Apply heat for 2-5 seconds) Use of a wet cloth is not necessary due to rapid heat dissipation of the bi--metallic connections Figure 6-12 Hermetic Thermostatic Expansion Valve Brazing Procedure 7. If applicable, braze the equalizer connection to the equalizer line. 8. Check superheat (refer to step 6.14.1). 6.
2 Be sure electrical power is removed from the unit. Disconnect leads. Remove top screw and washer. Lift off coil. (See Figure 6-14 or Figure 6-15) 3 Unbraze valve from unit and braze new valve in place 4 Install coil. Evacuate low side and place unit back in operation. Check charge. c. Determine which heater(s) need replacing by checking resistance on each heater. Refer to paragraph 2.3 for heater resistance values d. Remove hold-down clamp securing heaters to coil. e.
6.18 EVAPORATOR FAN MOTOR CAPACITORS the refrigeration unit into the container. The fan motor bearings are factory lubricated and do not require additional grease. The evaporator fan motors are of the permanent-split capacitor type. The motor is equipped with one capacitor used in the high speed circuit and another capacitor used for the low speed circuit. 6.17.1 Replacing The Evaporator Fan Assembly WARNING 6.18.
under load conditions. The important advantages of a analyzer are its ability to locate capacitors that have failed to hold their microfarad ratings, or those that are breaking down internally during operation. It is also useful in identifying capacitors when their microfarad rating marks have become unreadable. Right Display CAP ( p y Mode)) (Capacity 6.19 VALVE OVERRIDE CONTROLS CAUTION DO NOT disassemble piston from NEW suction modulating valve powerhead assembly.
6.20.1 Precheck Procedure ing to light indicates an open on that leg which indicates a poor connection or an open coil. Repair or replace as required to achieve proper operation. a. Check unit for abnormal operation. b. Check charge. If refrigerant is low repair as required and again check operation. c. If sufficient capacity cannot be maintained or unit is tripping excessively on high pressure switch (HPS) in high ambients, check coils and clean if required. d.
1 2 This test point enables the user to check if the controller unloader solenoid valve relay (TU) is open or closed. 2 3 TP2 This test point enables the user to check if the high pressure switch (HPS) is open or closed. TP3 This test point enables the user to check if the water pressure switch (WP) contact is open or closed. TP 4 This test point enables the user to check if the internal protector for the condenser fan motor(IP-CM) is open or closed.
5. Press the ENTER key on the keypad. 3 Disconnect the back connectors and remove module. 6. The Display will show the message “Pro SoFt.” This message will last for up to one minute. 4 When removing the replacement module from its packaging , note how it is packaged. When returning the old module for service, place it in the packaging in the same manner as the replacement.
Table 6-2 Sensor Temperature/Resistance Chart (+/--.002%) Temperature _C _F --30 --25 --20 --15 --10 --5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 65 --22 --13 --4 5 14 23 32 41 50 59 68 77 86 95 104 113 122 131 140 149 158 b. Cut wire(s) 5 cm (2 inches) from shoulder of defective sensor and discard the defective probe only. c. Cut one wire of existing cable 40 mm (1-1/2 inch) shorter than the other wire. d. Cut one replacement sensor wire (opposite color) back 40 mm (1-1/2 inch). (See Figure 6-19.) e.
T.I.R. Bolts Supply Air Stream Insulation STS probe Back Panel SRS probe Supply Sensor Mounting Clamp Sensor Wires Gasketed Cover Gasket Mounting Plate Gasketed Support Plate 2.5” Drip Loop 6.22.3 Sensor Re--Installation Figure 6-21 Supply Sensor Positioning c Sensor DTS a. Sensors STS and SRS The DTS sensor must have insulating material placed completely over the sensor to insure the coil metal temperature is sensed.
6.24.2 Cracks The damaged insert must be removed from the control box. Table 6-5 identifies the drill size and drill depth to be used for each insert. A stop ring should be used on the drill bit to limit the depth. Cracks in the control box are repaired using a fiberglass patch over the damaged area. Materials required are included in the Fiberglass Patch Kit supplied with Crack Repair Kit, Carrier Transicold part number 76-00724-00SV (see Table 6-3). a.
Table 6-3 Crack, Chip & Hole Repair Kit ITEM DESCRIPTION PART NUMBER Qty 1 Crack Repair Kit -- Includes 76--00724--00SV 1 2 . . . Fiberglass Patch Kit (Loctite FK--98 or 80265) 76--00724--00Z 10 3 . . . Sikaflex 221 Adhesive Sealant (Sikaflex 232--361) 02--00067--02Z 10 4 . . . Instruction Sheet 98--02339--00 10 Table 6-4 Insert Repair Kit ITEM DESCRIPTION PART NUMBER Qty 1 Insert Repair Kit -- Includes 76--50084--00 1 2 . . . Insert - 17.53 x 9.91 mm (..690 x .
Figure 6-24.
6.25 COMMUNICATIONS INTERFACE MODULE INSTALLATION c.. Remove the circuit breaker panel, with circuit breaker, from the control box. d.. Locate, wires CB21/CIA3, CB22/CIA5 and CB23/CIA7 that have been tied back in the wire harness. Remove the protective heat shrink from the ends of the wires. e.. Attach the three wires as addressed to the LOAD side of the circuit breaker. f.. Refit the circuit breaker panel. g. Fit the new RMU into the unit. h.
Table 6-7 R-134a Temperature - Pressure Chart Vacuum Temperature _F _C “/hg --40 .35 --40 .37 14.6 12.3 49.4 41.6 --30 --25 --34 --32 9.7 6.7 --20 --29 --18 --16 --28 --27 Pressure bar _F _C psig kPa kg/cm@@ bar 37.08 31.25 0.49 0.42 32.8 22.7 24.64 17.00 0.33 0.23 3.5 11.9 8.89 0.12 2.1 0.6 7.1 2.0 5.33 1.52 0.07 0.
SECTION 7 ELECTRICAL WIRING SCHEMATIC 7.1 INTRODUCTION This section contains the Electrical Schematics and Wiring Diagrams. The diagrams are presented as follows: Figure 7-1 Provides the legend for use with all figures. Figure 7-2 Provides the basic schematic diagram. Figure 7-3 Provides the basic wiring diagram. Sequence of operation descriptions for the various modes of operation are provided in paragraph 4.
Figure 7-2 SCHEMATIC DIAGRAM T-309 7-2
Figure 7-3 WIRING DIAGRAM (Sheet 1 of 2) 7-3 T-309
Figure 7-3 WIRING DIAGRAM (Sheet 2 of 2) T-309 7-4
INDEX A E Air Cooled Condenser Section, 2-4 Evacuation, 6-3 Alarm, 3-6, 3-10, 3-12, 3-17, 3-27 Evaporator, 6-10 B Battery, 1-1 Evaporator Fan, 6-12 Evaporator Section, 2-2 Expansion Module, 3-1, 6-14 Expansion Valves, 6-10 C F Capacitors, 6-12 Checking Superheat, 6-9 Failure Action, 3-4 Communications, 1-1 Filter--Drier, 6-8 Communications Interface Module, 3-11, 6-21 Fresh Air Makeup, 2-1, 4-1 Compressor, 1-1, 6-5 Frozen Mode, 4-6 Compressor Phase Sequence, 4-5 Frozen Mode -- Convention
INDEX K Key Pad, 3-2 L Refrigeration Circuit, 2-10 Refrigeration System Data, 2-6 Refrigeration Unit -- Front Section, 2-1 Remote Monitoring, 1-1 S Leak Checking, 6-3 Logging Interval, 3-10 M Safety and Protective Devices, 2-8 Sampling Type, 3-10 Scroll Back , 3-10 Manifold Gauge Set, 6-1 Sensor Configuration, 3-8 Microporcessor System, 3-1 Sequence Of Operation, 4-5 Modes Of Operation, 3-4 Service Valves, 6-1 O Solenoid Valves, 6-10 Starting, 4-2 Oil, 6-7 Stopping, 4-2 Operational Softwar
