Carrier 69NT20-531-300 User Manual

Carrier
Transicold

Container
Refrigeration

Model 69NT20-531-300

Streamline Scroll

T-309 Rev A

Operation
&Service

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. 07/02

SAFETY SUMMARY

GENERAL SAFETY NOTICES

The following general safety notices supplement the specific warnings and cautions appearing elsewhere in this
manual. They are recommendedprecautions that must be understood and applied during operationand maintenance
oftheequipmentcoveredherein.Thegeneralsafetynoticesarepresentedin thefollowingthreesectionslabeled:First
Aid, OperatingPrecautions and MaintenancePrecautions. A listing of thespecific warnings and cautions appearing
elsewhere in the manual follows the general safety notices.

FIRST AID

Aninjury,nomatterhowslight,shouldnevergounattended.Alwaysobtainfirstaidormedicalattentionimmediately.

OPERATING PRECAUTIONS

Always wear safety glasses.
Keep hands, clothing and tools clear of the evaporator and condenser fans.
Noworkshouldbeperformedontheunituntilallcircuitbreakers,start-stopswitchesareturnedoff,andpowersupply

is disconnected.
Always work in pairs. Never work on the equipment alone.
In case of severe vibration or unusual noise, stop the unit and investigate.

MAINTENANCE PRECAUTIONS

Beware of unannounced starting of the evaporator and condenser fans. Do not open the condenser fan grille or
evaporator access panels before turning power off, disconnecting and securing the power plug.

Besurepoweristurnedoffbeforeworkingonmotors,controllers,solenoidvalvesandelectricalcontrolswitches.Tag
circuit breaker and power supply to prevent accidental energizing of circuit.

Do not bypass any electrical safety devices, e.g. bridging an overload, or using any sort of jumper wires. Problems
with the system should be diagnosed, and any necessary repairs performed, by qualified service personnel.

Whenperforminganyarcweldingontheunitorcontainer,disconnectallwireharnessconnectorsfromthemodulesin
both control boxes. Do not remove wire harness from the modules unless you aregrounded to the unit frame with a
static safe wrist strap.

In case of electrical fire, open circuit switch and extinguish with CO

(never use water).

2

UNIT LABEL IDENTIFICATION

Tohelp 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 -- means an immediate hazard which WILL result in severe personal injury or death.
WARNING -- means to warn against hazards or unsafe conditions which COULD result in severe personal injury or

death.
CAUTION -- meansto warnagainst potential hazard or unsafe practicewhich could result in minor personal injury,

product or property damage.

SPECIFIC WARNING AND CAUTION STATEMENTS

The statements listed below are applicable to the refrigeration unit and appear elsewhere in t his manual. These
recommended precautions must be understood and applied during operation and maintenance of the equipment
covered herein.

WARNING

Beware of unannounced starting of the evaporator and condenser fans. The unit may cycle the fans
and compressor unexpectedly as control requirements dictate.

WARNING

Do not attempt to removepower plug(s)beforeturning OFFstart-stop switch (ST), unit circuit break­er(s) and external power source.

WARNING

Make sure the power plugs are clean and dry before connecting to any power receptacle.

Safety-1

T-309

WARNING

Make surethatthe unitcircuit breaker(s)(CB-1 & CB-2)and theSTAR T-STOPswitch (ST)arein the
“O” (OFF) position before connecting to any electrical power source.

WARNING

Never useair for leak testing. It has been determined thatpressurized,mixturesofrefrigerant 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.

WARNING

Before disassembly of the compressor make sure to relieve the internal pressure very carefully by
slightly loosening the couplings to break the seal.

WARNING

Oakite No. 32 is an acid. Be sure that the acid is slowly added to the water. DO NOT PUT WATER
INTO THE ACID -- this will cause spattering and excessive heat.

WARNING

Wearrubberglovesand wash thesolution fromtheskin immediatelyif accidentalcontactoccurs.Do
not allow the solution to splash onto concrete.

WARNING

AlwaysturnOFF the unit circuit breakers(CB-1 & CB-2) and disconnectmain power supply before
working on moving parts.

WARNING

Make sure power to the unit is OFF and power plug disconnected before removing capacitor(s).

WARNING

With power OFF discharge the capacitor before disconnecting the circuit wiring.

WARNING

Do not use a nitrogencylinder without a pressureregulator. Do not use oxygen in or near a refrigera­tion system as an explosion may occur.

WARNING

Do not open the condenser fan grille beforeturning power OFF and disconnecting power plug.

WARNING

The Unit Power Plug Must Be Disconnected To Remove Power From Circuit Breaker Cb1

CAUTION

Donotremovewireharnessesfromcontrollermodulesunlessyouaregroundedtotheunit framewith
a static safe wrist strap.

CAUTION

Unplugallcontrollermodulewireharnessconnectorsbeforeperformingarcweldingon anypartofthe
container.

CAUTION

When condenser waterflow is below 11 lpm (3 gpm)or when water-cooled operation is notin use,the
CFS switch MUST be set to position ”1” or the unit will not operate properly.

CAUTION

Pre-trip inspection should not be performed with critical temperature cargoes in the container.

T-309

Safety-2

CAUTION

When Pre-Tripkey 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 operatorin­tervention.

CAUTION

When Pre--Triptest Auto 2 runs to completion without being interrupted, the unitwill terminatepre­tripanddisplay “Auto2”“end.”The unit will suspendoperationuntil the userdepressestheENTER
key!

CAUTION

Topreventtrappingliquid refrigerantin themanifoldgaugeset be suresetis broughtto suctionpres­sure beforedisconnecting.

CAUTION

The scroll compressor achieves lowsuction pressure very quickly.Do not use thecompressor to evacu­ate the system below zero psig. Never operate the compressor with the suction or discharge service
valvesclosed (frontseated).Internaldamagewillresultfromoperating the compressorina deep vacu­um.

CAUTION

Use only Carrier Transicold approved Polyol Ester Oil (POE) -- Mobil ST32 compressor oil with
R-134a.Buyinquantitiesofonequartor smaller.When usingthishygroscopicoil, immediatelyreseal.
Do not leave container of oil open or contamination will occur.

CAUTION

Takenecessarysteps(placeplywoodover coil or useslingon motor)topreventmotorfromfallinginto
condenser coil.

CAUTION

DONOTdisassemblepiston fromNEWsuctionmodulatingvalvepowerheadassembly.Doing so may
result in damage to pi ston.

CAUTION

The unitmust be OFFwhenevera programming card is inserted or removed fromthe controllerpro­gramming port.

CAUTION

Do not allow moisture to enter wire splice area as this may affect the sensor resistance.

Safety-3

T-309

TABLE OF CONTENTS

PARAGRAPH NUMBER Page

GENERAL SAFETY NOTICES Safety-1.....................................................

FIRST AID Safety-1......................................................................

OPERATING PRECAUTIONS Safety-1......................................................

MAINTENANCE PRECAUTIONS Safety-1..................................................

UNIT LABEL IDENTIFICATION Safety-1...................................................

SPECIFIC WARNING AND CAUTION STATEMENTS Safety-1.................................

INTRODUCTION 1-1..............................................................................

1.1 INTRODUCTION 1-1..............................................................

1.2 CONFIGURATIONIDENTIFICATION 1-1.............................................

1.3 OPTION DESCRIPTIONS 1-1.......................................................

1.3.1 Battery 1-1....................................................................

1.3.2 Dehumidification 1-1............................................................

1.3.3 Control Box 1-1................................................................

1.3.5 Pressure Readout 1-1............................................................

1.3.6 Interrogator 1-1................................................................

1.3.7 Remote Monitoring 1-1..........................................................

1.3.8 Communications 1-1............................................................

1.3.9 Compressor 1-1................................................................

1.3.10 Back Panels 1-1................................................................

1.3.11 460 Volt Cable 1-2.............................................................

1.3.12 Cable Restraint 1-2..............................................................

1.3.13 Upper Air (Fresh Air Make Up) 1-2................................................

1.3.14 Evaporator 1-2.................................................................

1.3.15 Evaporator Fan Operation 1-2.....................................................

1.3.16 Labels 1-2.....................................................................

1.3.17 Plate Set 1-2...................................................................

1.3.18 Controller 1-2..................................................................

1.3.19 Stepper Drive 1-2...............................................................

1.3.20 Condenser Grille 1-2............................................................

DESCRIPTION 2-1...............................................................................

2.1 GENERAL DESCRIPTION 2-1......................................................

2.1.1 Refrigeration Unit -- Front Section 2-1..............................................

2.1.2 Fresh Air Makeup Vent 2-1.......................................................

2.1.3 Evaporator Section 2-2...........................................................

2.1.4 Compressor Section 2-3..........................................................

2.1.5 Air Cooled Condenser Section 2-4.................................................

2.1.6 Control Box Section 2-5.........................................................

2.1.7 Communications InterfaceModule 2-5..............................................

2.2 REFRIGERATION SYSTEM DATA 2-6...............................................

2.3 ELECTRICAL DATA 2-7...........................................................

2.4 SAFETY AND PROTECTIVE DEVICES 2-8...........................................

2.5 REFRIGERATION CIRCUIT 2-9.....................................................

i

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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 3-1..........................................................................

3.1 TEMPERATURE CONTROL MICROPROCESSOR SYSTEM 3-1..........................

3.1.1 Key Pad 3-2...................................................................

3.1.2 Display Module 3-2.............................................................

3.1.3 Controller 3-3..................................................................

3.2 CONTROLLER SOFTWARE 3-3.....................................................

3.2.1 Configuration Software (Configuration Variables) 3-3..................................

3.2.2 Operational Software(Function codes) 3-4...........................................

3.3 MODES OF OPERATION 3-4.......................................................

3.3.1 TemperatureControl -- Perishable Mode 3-4..........................................

3.3.2 Defrost Interval 3-4.............................................................

3.3.3 Failure Action 3-4..............................................................

3.3.4 GeneratorProtection 3-4.........................................................

3.3.5 Compressor High Temperature, Low Pressure Protection. 3-4............................

3.3.6 Perishable Mode -- Conventional 3-4................................................

3.3.7 Perishable Mode -- Economy 3-5...................................................

3.3.8 Perishable Mode -- Dehumidification 3-5............................................

3.3.9 Perishable, Dehumidification -- Bulb Mode 3-5.......................................

3.3.10 Temperature Control -- FrozenMode 3-6.............................................

3.3.11 Frozen Mode -- Conventional 3-6..................................................

3.4 CONTROLLER ALARMS 3-6.......................................................

3.5. UNIT PRE-TRIP DIAGNOSTICS 3-7.................................................

3.6 DataCORDER 3-7.................................................................

3.6.1 Description 3-7.................................................................

3.6.2 DataCORDER Software 3-7......................................................

3.6.3 Sensor Configuration (dCF02) 3-8.................................................

3.6.4 Logging Interval (dCF03) 3-10.....................................................

3.6.5 Thermistor Format (dCF04) 3-10...................................................

3.6.6 Sampling Type (dCF05 & dCF06) 3-10..............................................

3.6.7 Alarm Configuration (dCF07 -- dCF10) 3-10..........................................

3.6.8 DataCORDER Power-Up 3-10.....................................................

3.6.9 Pre-T rip Data Recording 3-10......................................................

3.6.10 DataCORDER Communications 3-10................................................

3.6.11 USDA Cold Treatment 3-11.......................................................

3.6.12 USDA Cold Treatment Procedure 3-11...............................................

3.6.13 DataCORDER Alarms 3-12........................................................

3.6.14 ISO Trip Header 3-12............................................................

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ii

TABLE OF CONTENTS (cont)

OPERATION 4-1.................................................................................

4.1 INSPECTION (Before Starting) 4-1...................................................

4.2 CONNECT POWER 4-1............................................................

4.2.1 Connection To 380/460 vac Power 4-1..............................................

4.3 ADJUST FRESH AIR MAKEUP VENT 4-1............................................

4.3.1 Upper Fresh Air Makeup Vent 4-1..................................................

4.4 CONNECT REMOTE MONITORING

RECEPTACLE 4-2......................................................................

4.5 STARTINGAND STOPPING INSTRUCTIONS 4-2......................................

4.5.1 Starting the Unit 4-2.............................................................

4.5.2 Stopping the Unit 4-2............................................................

4.6 START--UP INSPECTION 4-2.......................................................

4.6.1 Physical Inspection 4-2..........................................................

4.6.2 Check Controller Function Codes 4-2...............................................

4.6.3 Complete Inspection 4-2.........................................................

4.7 PRE-TRIP DIAGNOSIS 4-2.........................................................

4.8 OBSERVEUNIT OPERATION 4-3...................................................

4.8.1 Probe Check 4-3................................................................

4.9 SEQUENCE OF OPERATION 4-4......................................................

4.9.1 Sequence Of operation -- Compressor Phase Sequence 4-5................................

4.9.2 Sequence Of Operation -- Perishable Mode Cooling 4-5..................................

4.9.3 Sequence Of Operation --

Perishable Mode Heating 4-6...........................................................

4.9.4 Sequence Of operation -- Frozen Mode Cooling 4-6.....................................

4.9.5 Sequence Of Operation -- Defrost 4-6...............................................

TROUBLESHOOTING 5-1.........................................................................

5.1 UNIT WILL NOT START OR STARTS THEN STOPS 5-1................................

5.2 UNIT OPERATES LONG OR CONTINUOUSL YIN COOLING 5-1.........................

5.3 UNIT RUNS BUT HAS INSUFFICIENT COOLING 5-2..................................

5.4 UNIT WILL NOT HEAT OR HAS INSUFFICIENT HEATING 5-2..........................

5.5 UNIT WILL NOT TERMINATE HEATING 5-2.........................................

5.6 UNIT WILL NOT DEFROST PROPERLY 5-2..........................................

5.7 ABNORMAL PRESSURES (COOLING) 5-3...........................................

5.8 ABNORMAL NOISE OR VIBRATIONS 5-3............................................

5.9 CONTROLLER MALFUNCTION 5-4.................................................

5.10 NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOW 5-4.........................

5.11 THERMOSTATIC EXPANSION VALVE MALFUNCTION 5-4.............................

5.12 AUTOTRANSFORMER MALFUNCTION 5-4..........................................

5.13 WATER-COOLED CONDENSER OR WATER PRESSURE SWITCH 5-4....................

5.14 COMPRESSOR OPERATING IN REVERSE 5-5........................................

5.15 ABNORMAL TEMPERATURES 5-5..................................................

5.16 ABNORMAL CURRENTS 5-5.......................................................

iii

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TABLE OF CONTENTS (cont)

SERVICE 6-1....................................................................................

6.1 SECTION LAYOUT 6-1............................................................

6.2 SERVICE VALVES 6-1.............................................................

6.3. MANIFOLD GAUGE SET 6-1.......................................................

6.4 PUMPING THE UNIT DOWN 6-2....................................................

6.5 REFRIGERANT LEAK CHECKING 6-3...............................................

6.6 EVACUATION AND DEHYDRATION 6-3.............................................

6.6.1 General 6-3....................................................................

6.6.2 Preparation 6-3.................................................................

6.6.3 Procedure - Complete system 6-3..................................................

6.6.4 Procedure - Partial System 6-4.....................................................

6.7 REFRIGERANT CHARGE 6-5.......................................................

6.7.1 Checking the Refrigerant Charge 6-5................................................

6.7.2 Adding Refrigerant to System (Full Charge) 6-5.......................................

6.7.3 Adding Refrigerant to System (Partial Charge) 6-5.....................................

6.8 COMPRESSOR -- Model RSH105 6-5.................................................

6.8.1 Removal and Replacement of Compressor 6-5........................................

6.9 COMPRESSOR OIL LEVEL 6-7.....................................................

6.10 HIGH PRESSURE SWITCH 6-7......................................................

6.10.1 Replacing High Pressure Switch 6-7................................................

6.10.2 Checking High Pressure Switch 6-8................................................

6.11 CONDENSER COIL 6-8............................................................

6.12 CONDENSER FAN AND MOTOR ASSEMBLY 6-8.....................................

6.13 FILTER-DRIER 6-8................................................................

6.14 EXPANSION VALVES 6-9..........................................................

6.14.1 Checking Superheat. 6-9.........................................................

6.14.2 V alve Replacement 6-9..........................................................

6.15 EVAPORATOR COIL AND HEATER

ASSEMBLY 6-10........................................................................

6.15.1 Evaporator Coil Replacement 6-10..................................................

6.15.2 Evaporator Heater Replacement 6-10................................................

6.16 ECONOMIZER, UNLOADER, LIQUID INJECTION AND OIL RETURN SOLENOID VALVE 6-11

6.17 EVAPORATOR FAN AND MOTOR ASSEMBLY 6-11....................................

6.17.1 Replacing The Evaporator Fan Assembly 6-12.........................................

6.18 EVAPORATOR FAN MOTOR CAPACITORS 6-12.......................................

6.18.1 When To Check For A Defective Capacitor 6-12.......................................

6.18.2 Removing The Capacitor 6-12......................................................

6.18.3 Checking The Capacitor 6-12......................................................

6.19 VALVEOVERRIDE CONTROLS 6-13.................................................

6.20 SUCTION MODULATIONVALVE 6-13................................................

6.20.1 Precheck Procedure 6-14..........................................................

6.20.2 Checking The Stepper valve 6-14...................................................

6.21 CONTROLLER AND EXPANSION MODULE 6-14......................................

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iv

6.21.1 Handling Modules 6-14...........................................................

6.21.2 Controller Trouble-Shooting 6-15...................................................

6.21.3 Controller Programming Procedure 6-15..............................................

6.21.4 Removing and Installing a Module 6-16..............................................

6.22 TEMPERATURE SENSOR SERVICE 6-16..............................................

6.22.1 Sensor Checkout Procedure 6-16....................................................

6.22.2 Sensor Replacement 6-17..........................................................

6.22.3 Sensor Re--Installation 6-18........................................................

6.23 MAINTENANCE OF PAINTEDSURFACES 6-18........................................

6.24 COMPOSITE CONTROL BOX REPAIRS 6-18...........................................

6.24.1 Introduction 6-18................................................................

6.24.2 Cracks 6-19....................................................................

6.24.3 Chips And Holes 6-19............................................................

6.24.4 Inserts 6-19.....................................................................

6.24.5 Door Hinge Inserts 6-19...........................................................

6.25 COMMUNICATIONS INTERFACE MODULE INSTALLATION 6-22........................

ELECTRICAL WIRING SCHEMATIC 7-1............................................................

7.1 INTRODUCTION 7-1..............................................................

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LIST OF ILLUSTRATIONS

FIGURE NUMBER Page

Figure 2-1 Refrigeration Unit -- Front Section 2-1...............................................

Figure 2-2 Evaporator Section 2-2............................................................

Figure 2-3 Compressor Section 2-3...........................................................

Figure 2-4 Condenser Section 2-4............................................................

Figure 2-5 Control Box Section 2-5...........................................................

Figure 2-6 RefrigerationCircuit Schematic -- Standard Operation 2-10................................

Figure 2-7 RefrigerationCircuit Schematic -- Economized Operation 2-11.............................

Figure 2-8 RefrigerationCircuit Schematic -- Unloaded Operation 2-11...............................

Figure 3- 1 TemperatureControl System 3-1...................................................

Figure 3- 2 Key Pad 3-2....................................................................

Figure 3- 3 Display Module 3-2..............................................................

Figure 3- 4 Control and Expansion Modules 3-3.................................................

Figure 3- 5 Standard Configuration Download Report 3-9.........................................

Figure 3- 6 Data Reader 3-11.................................................................

Figure 4-1 Make Up Air Flow Chart 4-1.......................................................

Figure 4-2 Controller Operation -- Perishable Mode 4-4...........................................

Figure 4-3 Controller Operation -- Frozen Mode 4-5..............................................

Figure 4-4 Perishable Mode 4-5..............................................................

Figure 4-5 Perishable Mode Heating 4-6.......................................................

Figure 4-6 Frozen Mode 4-6................................................................

Figure 4-7 Defrost 4-7.....................................................................

Figure 6-1 Service Valve 6-1................................................................

Figure 6-2 Suction ServiceValve 6-1.........................................................

Figure 6-3 Manifold Gauge Set 6-1...........................................................

Figure 6-4 R-134a Manifold Gauge/Hose Set 6-2................................................

Figure 6-5. Refrigeration System ServiceConnections 6-3.........................................

Figure 6-6. Compressor Service Connections 6-4................................................

Figure 6-7 Compressor Upper Mounting 6-6....................................................

Figure 6-8 Compressor Lower Mounting 6-6...................................................

Figure 6-9 High Pressure Switch Testing 6-8...................................................

Figure 6-10 Thermostatic Expansion Valve Bulb 6-9.............................................

Figure 6-11 Evaporator Expansion Valve 6-9...................................................

Figure 6-12 Hermetic Thermostatic Expansion Valve Brazing Procedure 6-10..........................

Figure 6-13 Economizer Expansion Valve 6-10..................................................

Figure 6-14. Unloader Solenoid Valve 6-11.....................................................

Figure 6-15. Oil Return Solenoid Valve(ORV), Economizer Solenoid Valve (ESV),

Liquid Injection Solenoid Valve (LIV) 6-11...........................................

Figure 6-16. Evaporator Fan Assembly 6-12.....................................................

Figure 6-17 Suction Modulation Valve (SMV) 6-13...............................................

Figure 6-18 Controller Section of the Control Box 6-15............................................

Figure 6-19 Sensor Types 6-16...............................................................

Figure 6-20 TypicalSensor and Cable Splice 6-17................................................

Figure 6-21 Supply Sensor Positioning 6-18.....................................................

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vi

LIST OF ILLUSTRATIONS

FIGURE NUMBER Page

Figure 6-22 Return Sensor Positioning 6-18.....................................................

Figure 6-23 Door Hinge Repair 6-19...........................................................

Figure 6-24. Insert Location 6-21.............................................................

Figure 6-25. Communications Interface Installation 6-22...........................................

Figure 7-1 LEGEND 7-1...................................................................

Figure 7-2 SCHEMATIC DIAGRAM 7-2......................................................

Figure 7-3 WIRING DIAGRAM 7-3.........................................................

LIST OF TABLES

TABLE NUMBER Page

Table 2-1 Safety and Protective Devices 2-8.....................................................

Table 3-1 Key Pad Function 3-2..............................................................

Table 3-2 DataCORDER Configuration Variables 3-8.............................................

Table 3-3 DataCORDER Standard Configurations 3-8.............................................

Table 3-4 Controller Configuration Variables 3-13.................................................

Table 3-5 Controller Function Codes 3-14.......................................................

Table 3-6 Controller Alarm Indications 3-17.....................................................

Ta ble 3-7 Controller Pre-Trip Test Codes 3-21....................................................

Table 3-8 DataCORDER Function Code Assignments 3-25..........................................

Table 3-9 DataCORDER Pre-Trip Result Records 3-26.............................................

Table 3-10 DataCORDER Alarm Indications 3-27.................................................

Ta ble 6-1 Compressor Kit 6-6................................................................

Table 6-2 Sensor Temperature/ResistanceChart (+/--.002%) 6-17.....................................

Table 6-3 Crack, Chip & Hole Repair Kit 6-20....................................................

T able 6-4 Insert Repair Kit 6-20...............................................................

T able 6-5 Drill Information 6-20...............................................................

Table 6-6 Recommended Bolt Torque Values 6-22.................................................

Table 6-7 R-134a Temperature - Pressure Chart 6-23...............................................

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T309

SECTION 1

INTRODUCTION

1.1 INTRODUCTION

The Carrier Transicold model 69NT20--531-300 units
are of lightweight aluminum frame construction,
designedtofitinthefrontofa containerandserveasthe
container front wall.

They are one piece, self-contained, all electric units
which are fitted with cooling and heating systems to
provide precise temperaturecontrol.

The units are supplied with a complete charge of
refrigerant R-134a and compressor lubricating oil and
are ready for operation upon installation. Forklift
pockets are provided for unit installation and removal.

The base unit operates on nominal 380/460 volt, 3
phase, 50/60 hertz power. An optional autotransformer
maybefittedto allow operationon nominal190/230, 3
phase,50/60 hertz power.Power forthe control system
is provided by a transformer which steps the supply
power down to 18 and 24 volts, single phase.

The controller is a Carrier Transicold Micro-Link 2i
microprocessor. The controller will operate
automatically to select cooling, holding or heating as
required to maintain the desired set point temperature
within very close limits.

The controller is fitted with a keypad and display for
viewingor changing operatingparameters.Thedisplay
isalsoequippedwithlightstoindicatevariousmodesof
operation.

1.2 CONFIGURATION IDENTIFICATION

Unit identification informationis provided on a model
plate located to the left of the economizer. The plate
provides the unit model number and the unit parts
identification number (PID). The model number
identifies the overall unit configuration while the PID
provides information on specific optional equipment,
factory provision to allow for field installation of
optional equipment and differencesin detailed parts.

Configuration identification for the models covered
hereinareprovided in the Carrier Transicold Container
Unit Matrix manual, publicationT--300. Printedcopies
ofthe T--300may be obtainedfrom CarrierTransicold.
Also,aweeklyupdatedcopymaybefoundattheCarrier
Web site, www.carrier.refrigeration.com.

1.3 OPTION DESCRIPTIONS

Various options maybefactoryorfieldfittedto thebase
unit. Brief descriptions of the options are provided in
the following subparagraphs.

1.3.1 Battery

The controller may be fitted with standard replaceable
batteries or a rechargeable battery pack.

1.3.2 Dehumidification

The unit may be fitted with a humidity sensor. This
sensor allows setting of a humidity set point in the
controller. In the dehumidificationmode the controller
willoperatetoreduce internal container moisturelevel.

1.3.3 Control Box

The control box is constructed of composite material
and may be fitted with a lockable door.

1.3.4 Temperature Readout

The unit may be fitted with suction and discharge
temperature sensors. The sensor readings may be
viewed on the controller display.

1.3.5 Pressure Readout

Theunitmaybefittedwithfactoryinstalledsuction and
discharge pressure gauges. The unit is fitted with
suctionanddischargetransducers.Thereadingsmaybe
viewed on the controller display.

1.3.6 Interrogator

UnitsthatusetheDataCORDERfunctionarefittedwith
interrogator receptacles for connection of equipment to
download the recorded data. Two receptacles may be
fitted, one accessible from the front of the unit and the
other mounted inside the container (with the USDA
receptacles).

1.3.7 Remote Monitoring

The unit may be fitted with a remote monitoring
receptacle. This item allows connection of remote
indicators for COOL, DEFROST and IN RANGE.

1.3.8 Communications

Theunitmay be fittedwitha communications interface
module. The communications interface module is a
slave module which allows communication with a
master central monitoring station. The module will
respondto communicationand return informationover
the main power line. Refer to the ship master system
technical manual for further information.

1.3.9 Compressor

The unit is fitted with a scroll compressor.

1.3.10 Back Panels

Backpanel designs that maybe fittedinclude panels of
aluminumandstainlesssteel.Panels maybe fitted with
access doors and/or hinge mounting.

1-1 T-309

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.

1.3.12 Cable Restraint

Various designs are available for storage of the power
cables. These options are variations of the compressor
section front cover.

1.3.13 Upper Air (Fresh Air Make Up)

The unit may be fitted with an upper fresh air makeup
assembly. These assemblies are supplied in two
designs, the standard design and the micro design. The
openings may also be fitted with screens.

1.3.14 Evaporator

Theunitis fittedwith anevaporatorcoiland a hermetic
thermal expansion valve.

1.3.15 Evaporator Fan Operation

The units are fitted with Normal Evaporator Fan
Operation, opening of an evaporator fan internal
protector will shut down the unit.

1.3.16 Labels

OperatingInstruction and Function Code listing labels
will differ depending on the options installed. For

example, additional operating instructions arerequired
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.

1.3.17 Plate Set

Each unit is equipped with a tethered set of wiring
schematic and wiring diagram plates.
The plate sets are ordered using a seven digit base part
numberandatwodigit dashnumber. (See UnitMatrix

Manual, T-300)

1.3.18 Controller

Replacement controllers may be ordered as a universal
un--configured controller (without configuration
software) or configured.

1.3.19 Stepper Drive

All the units covered by this manual have suction
modulatingvalveswhichacttocontrolsystemcapacity.
Unitsindicatedasbeingfittedwith“stepperdrive”have
digital control motors fitted to the suction modulating
valve to open and close the valve in steps as required.

1.3.20 Condenser Grille

Two styles of condenser grilles are available, direct
bolted grilles and hinged grilles.

T-309

1-2

SECTION 2

DESCRIPTION

2.1 GENERAL DESCRIPTION

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. Theupperaccesspanels allowentryintothe
evaporator section, and the center access panel allows
access to the evaporator expansion valve, unloader

15

14

valve, suction modulation valve and evaporator coil
heaters.Theunitmodelnumber,serialnumberandparts
identificationnumbercanbefoundon the serialplateto
the left of the economizer.

2.1.2 Fresh Air Makeup Vent

Thefunctionof the upperorlower makeup air vent isto
provide ventilation for commodities that require fresh
air circulation.

1

2

3

13

12

11

10

9

8

7

1. Access Panel (Evap. Fan #1)

2. Access Panel (Heaters, Suction Modulating
Valve, Unloader Valve & Evaporator
Expansion Valve)

3. Fork Lift Pockets

4. Control Box

5. Compressor

6. Receiver or Water Cooled Condenser

7. Economizer

8. Unit Serial Number, Model Number and

Figure 2-1 Refrigeration Unit -- Front Section

4

6

16

5

Parts Identification Number (PID) Plate

9. Power Cables and Plug

10. Condenser Fan

11. Interrogator Connector (Front left)

12. Blank Cover (Temperature Recorder Location)

13. Blank Cover (Lower Fresh Air Makeup Vent
Location)

14. Upper Fresh Air Makeup Vent

15. Access Panel (Evap. Fan #2)

16. Compressor Protection Panel (cutaway view)

2-1

T-309

2.1.3 Evaporator Section

The evaporatorsection (Fi gure 2-2)contains the return
recorder sensor, return temperature sensor, evaporator
expansion valve, unloader valve, suction modulation
valve, dual-speed evaporator fans (EM1 and EM2),
evaporator coil and heater, defrost heaters, defrost
temperature sensor, heat termination thermostat and
suction temperature sensor.

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
dischargingit at the bottom.

Theevaporatorcomponents are accessiblebyremoving
the upper rear panel (as shown in the illustration) or by
removing the front access panels.

3

4

2

1

8

9

10

5

17

11

12

7

6

1. Evaporator Fan Motor #1

2. Return Recorder/Temperature Sensor

3. Humidity Sensor

4. Evaporator Fan Motor #2

5. Defrost Temperature Sensor

6. Heater Termination Thermostat

7. Evaporator Coil

8. Evaporator Coil Heaters

9. Evaporator Expansion Valve Bulb

Figure 2-2 Evaporator Section

15

14

16

13

10. Evaporator Expansion Valve

11. Low Side Access Valve

12. Suction Modulating Valve

13. Suction Temperature Sensor

14. To Compressor

15. From Coil

16. To Coil

17. Unloader Solenoid Valve

2-2T -309

2.1.4 Compressor Section

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

23

transducer, discharge temperature sensor and the
suction pressure transducers.

The supply temperature sensor, supply recordersensor
and ambient sensor are located at the left side of the
compressor.

2

1

4

22

21

20

18

19

17

16

3

1. Compressor Guard

2. Supply Temperature/Supply Recorder Sensor
Assembly

3. Ambient Sensor

4. Supply Air Thermometer Port (location)

5. Oil Drain

6. Compressor

7. Compressor Sight Glass

8 Compressor Power Plug

9. Discharge Service Valve

10. High Pressure Switch

11. Access Valve

Figure 2-3 Compressor Section

9

10

11

12

13

11

8

7

Discharge
Connection
(Hidden)

Economizer
Connection

Suction
Connection

Oil Return
Connection

14

11

6

5

15

12. Economizer Service Valve

13. Suction Service Valve

14. Discharge Temperature Sensor

15. Oil Return Service Valve

16. Discharge Pressure Transducer

17. Oil Return Solenoid Valve

18. Oil Separator

19. From Economizer

20. To Condenser

21. From Suction Modulating Valve

22. Suction Strainer

23. Suction Pressure Transducer

2-3

T-309

2.1.5 Air Cooled Condenser Section

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

3

4

Thecondenserfanpullsair in thebottom ofthe coiland
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.

5

6

7

9

27

26

25

24

1. Grille and Venturi Assembly

2. Condenser Fan

3. Key

4. Condenser Fan Motor

5. Condenser Coil

6. Condenser Motor Mounting Bracket

7. Condenser Coil Cover

8. Economizer

9. To Evaporator Expansion Valve

10. Liquid Injection Solenoid Valve

11. From Condenser

12. To Condenser

13. To Compressor Economizer Connection

14. To Unloader Solenoid Valve

8

23

Figure 2-4 Condenser Section

12

10

22
21

20

14

17

19

15. From Compressor Discharge

16. Discharge Pressure Transducer

17. Oil Separator

18. To Oil Return Solenoid

19. Receiver

20. Sight Glass/Moisture Indicator

21. Sight Glass

22. Fusible Plug

23. Access Valve

24. Liquid Line Service Valve

25. Filter-Drier

26. Economizer Expansion Valve

27. Economizer Solenoid Valve

11

13

15

16

18

2-4T -309

2.1.6 Control Box Section

The control box (Figure 2-5) includes the manual
operationswitches;circuitbreaker(CB-1);compressor,
fan and heater contactors; control power transformer;
fuses;key pad;display module; currentsensormodule;
controller module expansion module and the
communications interface module.

2.1.7 Communications Interface Module

The communications interface module is a slave
module which allow communication with a master
centralmonitoring station. The module will respond to
communication and return information over the main
powerline.Referto themastersystemtechnicalmanual
for further information.

12 3 4 5 6 7

8

1920 151718

1. Compressor Phase A Contactor

2. Compressor Phase B Contactor

3. Heater Contactor

4. Display Module

5. Communications Interface Module

6. Controller/DataCORDER Module (Controller)

7. Expansion Module

8. Key Pad

9. Start-Stop Switch

10. Remote Monitoring Receptacle

Figure 2-5 Control Box Section

14

1 1. Manual Defrost Switch

12. Condenser Fan Switch

13. Controller Battery Pack

14. Interrogator Connector (Box Location)

15. Control Transformer

16. Evaporator Fan Contactor - High

17. Evaporator Fan Contactor - Low

18. Condenser Fan Contactor

19. Circuit Breaker -- 460V

20. Current Sensor Module

2-5

121316

10 911

T-309

2.2 REFRIGERATION SYSTEM DATA

a.Compressor/Moto

r

y

d.H

T

h

H

igh

P

h

ibleP

l

i.R

D

i

k.W

h

Assembly

b. Evaporator Expansion

Valve Superheat

c. Economizer Expansion

Valve Superheat

eaterTermination

e.

f. Refrigerant Charge

g.Fus
h. Sight Glass/Moisture Indicator

j. Unit Weight

ressureSwitc

ug

upture

aterPressureSwitc

sc

ermostat

Model RSH105
Weight (Dry) 46.5 kg (103 lb)
Approved Oil Mobil ST32
Oil Charge 2957 ml (100 ounces)

The oil level range, with the compressor off,

Oil Sight Glass

should be between the bottom and one-eighth
level of the sight glass.

Verify at --18 _C
(0 _F) container box

4.4to6.7_C(8to12_F)

temperature

4.4 to 11.1 _C(8to20_F)

Opens 54 (¦ 3) _C = 130 (¦ 5) _F
Closes 38 (¦ 4) _C = 100 (¦ 7) _F
Cutout 25 (¦ 1.0) kg/cm@ = 350 (¦ 10) psig
Cut-In 18 (¦ 0.7) kg/cm@ = 250 (¦ 10) psig
Unit Configuration Charge Requirements -- R-134a

4--RowCoil

Water-Cooled
Condenser

Receiver

5.33 kg

(11.75 lbs)

4.99kg

(11.0 lbs)
Melting point 99 _C = (210 _F)
Torque 6.2 to 6.9 mkg (45 to 50 ft-lbs)
Torque 8.9 to 9.7 mkg (65 to 70 ft-lbs)
Bursts at 35 ¦ 5% kg/cm@ = (500 ¦ 5% psig)
Torque 6.2 to 6.9 mkg (45 to 50 ft-lbs)

Refer t o unit model number plate.
Cut-In 0.5 ¦ 0.2 kg/cm@ (7 ¦ 3psig)
Cutout 1.6 ¦ 0.4 kg/cm@ (22 ¦ 5psig)

2-6T -309

2.3 ELECTRICAL DAT A

a.CircuitBreake

r

c.CondenserFa

n

d.EvaporatorCoi

l

e.EvaporatorFan

f.Fuses

a. Circuit Breaker

b. Compressor

Motor

Motor

d. Evaporator Coil

Heaters

Motor(s)

f. Fuses

CB-1 Trips at 29 amps
CB-2 (50 amp) Trips at 62.5 amps
CB-2 (70 amp) Trips at 87.5 amps

Full Load Amps (FLA) 13 amps @ 460 vac

380 vac, Single Phase,

50 hz
Full Load Amps 1.3 amps 1.6 amps
Horsepower 0.43 hp 0.75 hp
Rotations Per Minute 1425 rpm 1725 rpm
Voltage and Frequency 360 -- 460 vac ¦ 2.5 hz 400 -- 500 vac ¦ 2.5 hz
Bearing Lubrication Factory lubricated, additional grease not required.
Rotation Counter-clockwise when viewed from shaft end.
Number of Heaters 4
Rating 750 watts +5/--10% each @ 230 vac
Resistance (cold) 66.8 to 77.2 ohms @ 20 _C(68_F)
Type Sheath

380 vac/50 hz 460 vac/60 hz

Full Load Amps

High Speed

Full Load Amps

Low Speed

Nominal Horsepower

High Speed

Nominal Horsepower

Low Speed

Rotations Per Minute

High Speed

Rotations Per Minute

Low Speed
Voltage and Frequency 360 -- 460 vac ± 1.25 hz 400 -- 500 vac ± 1.5 hz
Voltage & Frequency us-

ing power autotransformer
Bearing Lubrication Factory lubricated, additional grease not required
Rotation CW when viewed from shaft end
Control Circuit 10 amps (F3)
Controller/DataCORDER 5amps(F1&F2)
Expansion Module 10 amps (F4)

180 -- 230 vac ± 1.25hz 200 -- 250 vac ± 1.5 hz

1.6 2.0

0.8 1.0

0.70 0.84

0.09 0.11

2850 rpm 3450 rpm

1425 rpm 1750 rpm

460 vac, Single Phase,

60 hz

2-7

T-309

PARAGRAPH 2.3 -- Continued

idityS

Orange wire Power
Red wire Output
Brown wire Ground
Input voltage 5vdc

g.Hum

ensor

Output voltage 0to3.3vdc

30% 0.99 V
50% 1.65 V
70% 2.31 V
90% 2.97 V

Output voltage readings verses relative humidity (RH) percentage:

2.4 SAFETY AND PROTECTIVE DEVICES

Unit components are protected from damage by safety
and protective devices listed in t he following table.
Thesedevicesmonitortheunitoperatingconditionsand
open a set of electrical contacts when an unsafe
condition occurs.

Open safetyswitch contacts oneitherorbothofdevices

Table 2-1 Safety and Protective Devices

UNSAFE CONDITION

IP-CP or HPS will shut down the compressor.
Opensafetyswitch contacts ondeviceIP-CM will shut

down the condenser fan motor.
Theentirerefrigerationunit willshutdown ifoneofthe

following safety devices open: (a) Circuit Breaker(s);
(b)Fuse(F3/15A);or(c)EvaporatorFanMotorInternal
Protector(s) -- (IP-EM).

DEVICE DEVICE SETTING

Circuit Breaker (CB-1) -- Manual Reset Tripsat 29 amps (460 vac)

Excessive current draw Circuit Breaker (CB-2, 50 amp) --Manual Reset Tripsat 62.5 amps (230 vac)

Circuit Breaker (CB-2, 70 amp) --Manual Reset Trips at 87.5 amps (230 vac)

Excessive current draw in the
control circuit

Excessive current draw by the
controller

Excessive current draw by the
expansion module

Excessive condenser fan mo­tor winding temperature

Fuse (F3) 10 amp rating

Fuse (F1 & F2) 5 amp rating

Fuse (F4) 10 amp rating

Internal Protector (IP-CM) -- Automatic Reset N/A

Excessive compressor motor
winding temperature

Excessive evaporator fan mo­tor(s) winding temperature

Abnormal pressures/tempera­tures in the high refrigerant
side

Abnormally high discharge
pressure

Internal Protector (IP-CP) -- Automatic Reset N/A

Internal Protector(s) (IP-EM) -- Automatic Reset N/A
Fusible Plug -- Used on the Receiver

Rupture Disc -- Used on the Water-Cooled Con-

93 _C = (200 _F)
35 kg/cm@ = (500 psig)

denser
High Pressure Switch (HPS)

2-8T -309

Opens at 25 kg/cm@
(350 psig)

2.5 REFRIGERATION CIRCUIT

2.5.1 Standard Operation

Starting at the compressor, (see Figure 2-6, upper
schematic) the suction gas is compressed to a higher
pressure and temperature.

Inthestandardmode,boththeeconomizerandunloader
solenoid valves are closed. The gas flows through the
discharge service valve into the oil separator. In the
separator,oil is removed from the refrigerantand stored
forreturntothecompressorwhentheoil returnsolenoid
valveisopenedbythecontroller.Theoilreturnsolenoid
valveisanormallyopenvalvewhichallowsreturnofoil
during the off cycle.
The refrigerant gas continues into the air-cooled
condenser. When operating with the air-cooled
condenser active, air flowing across the coil fins and
tubes cools the gas to saturation temperature. By
removing latent heat, the gas condenses to a high
pressure/high temperature liquid and flows to the
receiver which stores the additional charge necessary
for low temperature operation.

Whenoperatingwiththewatercooledcondenseractive
(see Figure 2-6, lower schematic), the refrigerant gas
passes through the air cooled condenser and enters the
watercooled condenser shell. The waterflowinginside
thetubing coolsthe gasto saturationtemperatureinthe
same manner as the air passing over the air cooled
condenser. The refrigerant condenses on the outside of
the tubes and exits as a high temperature liquid. The
water cooled condenser also acts as a receiver, storing
excess refrigerant.

The liquid refrigerantcontinues through the liquid line
service valve, the filter-drier (which keeps refrigerant
clean and dry) and the economizer (which is not active
during standardoperation) to the evaporator expansion
valve. As the liquid refrigerant passes through the
variable orifice of the expansion valve, some of it
vaporizes into a gas (flash gas). Heat is absorbed from
the return air by the balance of the liquid, causing it to
vaporize in the evaporator coil. The vapor then flows
through the suction modulation valve to the
compressor.

Theevaporatorexpansionvalveisactivatedbythebulb
strapped to the suction line near the evaporator outlet.
The valve maintains a constant superheat at the coil
outlet regardless of load conditions.

On systems fitted with a water pressure switch, the
condenser fan will be off when there is sufficient
pressure to open the switch. If water pressure drops
belowthe switch cut out setting, thecondenser fanwill
be automatically started. When operating a system
fitted with a condenser fan switch, the condenser fan
willbeoffwhentheswitch isplaced in the“O”position.
The condenser fan will be on when theswitch is placed
in the “I” position.

2.5.2 Economized Operation

Intheeconomizedmodethefrozenrangeandpulldown
capacityoftheunitisincreasedbysubcoolingtheliquid
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.

During economized operation, flow of refrigerant
through the main refrigerant system is identical to the
standard mode. (The unloader solenoid valve is
de--energized [closed] by the controller.)

Liquid refrigerant for use in the economizer circuit is
taken from the main liquid line as it leaves the
filter--drier(seeFigure 2-7).Theflowis activatedwhen
thecontroller energizesthe economizer solenoid valve.
The liquid refrigerant flows through the economizer
expansion valve and the economizer internal passages
absorbingheatfromtheliquid refrigerantflowingtothe
evaporator expansion valve. The resultant “medium”
temperature/pressure gas enters the compressor at the
economizer service valve.

2.5.3 Unloaded Operation

The system will operate in the unloaded mode during
periods of low load, during periods of required
discharge pressure or current limiting, and during
start--up.

During unloaded operation, flow of refrigerantthrough
the main refrigerant system is identical to the standard
mode. (The economizersolenoid valve isde--energized
[closed] by the controller.)

In the unloaded mode, a portion of the mid--stage
compressed gas is bypassed to decrease compressor
capacity. The flow is activated when the controller
opens the unloader solenoid valve (see Figure 2-7.
Opening of the valve creates a bypass from the
economizerservicevalvethroughtheunloadersolenoid
valve and into the suction line on the outlet side of the
suction pressure modulation valve.

Asloadonthesystemdecreases,thesuctionmodulating
valve decreases flow of refrigerant to the compressor.
This action balances the compressor capacity with the
loadandpreventsoperation with low coiltemperatures.
In this mode of operation, the liquid injection solenoid
valve will open as required to provide sufficientliquid
refrigerant flow into the suction line for cooling of the
compressor motor.

2-9

T-309

EVAPORATOR

STANDARD OPERATION WITH RECEIVER

LOW SIDE ACCESS VALVE

FILTER
DRIER

ECONOMIZER

TXV

LIQUID LINE
SERVICE
CONNECTION

CONDENSER

ESV

FUSIBLE PLUG

TXV BULB

TXV

USV

LIV

ECONOMIZER TXV BULB

ECONOMIZER

OIL SEPARATOR

RECEIVER

SIGHTGLASS

MOISTURE INDICATOR

DISCHARGE LIQUID SUCTION

DPT

CPDS

ORV

OIL RETURN
SERVICE VALVE

SMV

COMPRESSOR

DISCHARGE

SERVICE

CONNECTION

HPS

ECONOMIZER
SERVICE
CONNECTION

SUCTIONSERVICE
CONNECTION

SPT

STS

FILTER
DRIER

STANDARD OPERATION WITH WATER COOLED CONDENSER

ECONOMIZER

TXV

LIQUID LINE
SERVICE
CONNECTION

EVAPORATOR

CONDENSER

ECONOMIZER TXV BULB

ECONOMIZER

ESV

SIGHTGLASS/

MOISTURE INDICATOR

TXV

RUPTURE DISC

WATER COOLED
CONDENSER

TXV BULB

LIV

LOW SIDE ACCESS VALVE

USV

DPT

CPDS

ORV

OIL RETURN
SERVICE VALVE

SMV

COMPRESSOR

DISCHARGE

SERVICE

CONNECTION

HPS

SPT

QUENCH

TXV

BULB

ECONOMIZER
SERVICE
CONNECTION

SUCTIONSERVICE
CONNECTION

CPSS

Figure 2-6 Refrigeration Circuit Schematic -- Standard Operation

2-10T-309

EVAPORATOR

LOW SIDE ACCESS VALVE

CONDENSER

ESV

ECONOMIZER

TXV

LIQUID LINE
SERVICE CONNECTION

ECONOMIZER TXV BULB

ECONOMIZER

RECEIVER

LIQUID ECONOMIZER PRESSURE

TXV BULB

TXV

LIV

OIL SEPARATOR

SMV

ECONOMIZER
SERVICE
CONNECTION

Figure 2-7 Refrigeration Circuit Schematic -- Economized Operation

TXV BULB

TXV

LIV

ECONOMIZER TXV BULB

OIL SEPARATOR

RECEIVER

SMV

USV

SUCTIONSERVICE
CONNECTION

LIQUID ECONOMIZER PRESSURE

SUCTION

Figure 2-8 Refrigeration Circuit Schematic -- Unloaded Operation

2-11

T-309

SECTION 3

MICROPROCESSOR

3.1 TEMPERATURE CONTROL MICROPRO­CESSOR SYSTEM

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. The controller
houses the temperature control software and the
DataCORDER Software. The temperature control
software functions to operate the unit components as
required to provide the desired cargo temperature and
humidity. The DataCORDER software functions to

record unitoperatingparameters and cargo temperature
parameters for future retrieval. Coverage of the
temperaturecontrolsoftwarebeginswithparagraph3.2.
Coverageof theDataCORDER software is providedin
paragraph 3.6.

The key pad and display module serve to provide user
accessand readoutsfor bothofthe controller functions,
temperaturecontrol and DataCORDER. The functions
are accessed by key pad selections and viewed on the
displaymodule.Thecomponentsaredesignedtopermit
ease of installation and removal.

C
O
N
T
R
O
L
L
E
R

TEMPERATURE CONTROL SOFTWARE

CONFIGURATION

SOFTWARE

CONFIGURATION

VARIABLE

(CnF##)

CONTROL MODULE DISPLAY MODULE

EXPANSION MODULE

KEY PAD

OPERATIONAL

SOFTWARE

FUNCTION
CODE (Cd)

DataCORDER SOFTWARE

ALARMS

(AL<70)

TO

DISPLAY

PRE--TRIP INTERROGATION

CONNECTOR

DATAREADER

CONFIGURATION

SOFTWARE

CONFIGURATION

VARIABLE

(dCF## read only)

OPERATIONAL

SOFTWARE

FUNCTION
CODE (dC)

Figure 3- 1 Temperature Control System

ALARMS

(AL>69)

TO

DISPLAY

STORAGE

MEMORY

(Scrollback)

3-1

DATA

TO

DISPLAY

Computer Device

With DataLine

Software

T-309

3.1.1 Key Pad

Thekey pad (Figure 3- 2)is mounted on the right-hand
side of the control box. The key pad consists of eleven
pushbuttonswitchesthatactas the user’sinterfacewith
the controller. Descriptions of the switch functions are
provided in Table 3-1.

CODE

SELECT

ALARM

LIST

RETURN

SUPPLY

BATTERY

POWER

Figure 3- 2 Key Pad

COOL HEAT DEFROST IN RANGEALARM SUPPLY RETURN

PRE

TRIP

DEFROST
INTERVAL

ENTER

_C

_F

ALT.

MODE

Table 3-1 Key Pad Function

KEY FUNCTION

Code Select Accesses function codes.

Pre-Trip

Alarm List

Defrost

Interval

Enter

Arrow Up

Arrow

Down

Return/

Supply

Displaysthe pre-trip selection menu. Dis­continues pre-trip in progress.

Displaysalarm list and clears the alarm
queue.

Displaysselected defrost interval.
Confirmsa selection or saves a selection

to the controller.
Change or scroll a selection upward Pre-

trip advance or test interruption.
Change or scroll a selection downward.

Pre-trip repeat backward.
Displays non-controlling probe tempera-

ture (momentary display).
Displaysalternate English/Metricscale

(momentary display). When set to _F,
pressure is displayed in psig and vacuum
in “/hg. “P” appears after the value to in-

_C/_F

dicate psig and “i” appears for inches of
mercury.

When set to _C. pressure readings are in
bars. “b” appears after the value to indi­cate bars.

Battery

Power

Initiate battery backup mode to allow set
point and function code selection if AC
power is not connected.

This key is pressed to switch the functions
from the temperature software to the Da-

ALT Mode

taCORDERSoftware. The remaining keys
function the same as described above ex­cept the readings or changes are made to
the DataCORDER programming..

SETPOINT/Code AIR TEMPERATURE/Data

Figure 3- 3 Display Module

3.1.2 Display Module

The display module (Figure 3- 3) consists of two
backlightedfivedigit LCD displaysandsevenindicator
lights. The i ndicator lights include:

1. Cool -- White LED: Energized when the refrigerant

compressor is energized.

2. Heat-- OrangeLED:Energized toindicateheaterop-

eration in the heat or defrost mode.

3. Defrost-- OrangeLED: Energizedwhentheunit isin

the defrost mode.

4. In-Range -- Green LED: Energized whe n the con-

trolled temperature probe is within specified toler­ance of set point.

NOTE

The controlling probe in the perishable range
will be the SUPPLY air probe and the control­ling probe in the frozen range will be the
RETURN air probe.

5. Supply--YellowLED:Energizedwhenthesupplyair
probe is used for control. When this LED is illumi­nated,the temperaturedisplayed in the AIR TEMPER­ATURE display is the reading at the supply air probe.
ThisLED will flash if dehumidificationor humidifi­cation is enabled.

6. Return -- YellowLED:Energizedwhenthereturnair

probe is used for control. When this LED is illumi­nated, the temperature displayed in the AIR TEM­PERA TUREdisplayis thereading atthe returnairpro­be. This LED will flash if dehumidification or
humidification is enabled.

7. Alarm-- Red LED: Energizedwhenthereis anactive

or an inactive shutdown alarm in the alarm queue

3-2T -309

12

33 3 3 345 67

8

9

1

1. Mounting Screw

2. Micro-Link 2i Control/DataCORDER Module

3. Connectors

4. Test Points

5. Fuses

3.1.3 Controller

3

Figure 3- 4 Control and Expansion Modules

3

3 3 3

CAUTION

Do not remove wire harnesses from control­ler modules unless you are grounded to the
unit frame with a static safe wrist strap.

CAUTION

Unplug all controller module wire harness
connectors before performing arc welding
on any part of the container.

NOTE

Do not attempt to service the controller mod­ules. Breaking the seal will void the warranty.

The Micro--Link 2i controller is a dual module
microprocessoras shown inFigure 3- 4. Itis fittedwith
test points, harness connectors and a software card
programming port.

3.2 CONTROLLER SOFTWARE

The controller software is a custom designed program
that is subdivided into the Configuration Software and
the Operational Software. The controller software
performs the following functions:

a. Control supply or return air temperature to required

limits, provide modulated refrigeration operation,
economized operation, unloaded operation, electric
heatcontrolanddefrost. Defrost isperformedtoclear
build up of frost and ice and ensure proper air flow
across the coil.

b. Providedefaultindependentreadoutsofsetpointand

supply or return air temperatures.

6. Control Circuit Power Connection
(Location: In back of controller)

7. Software Programming Port

8. Battery Pack

9. Expansion Module

c. Provide abilityto readand (ifapplicable)modifythe

Configuration Software Variables, Operating Soft­ware Function Codes and Alarm Code Indications.

d. ProvideaPre-Tripstep-by-stepcheckoutofrefrigera-

tion unit performance including: proper component
operation,electronicand refrigerationcontrolopera­tion, heater operation, probe calibration, pressure
limiting and current limiting settings.

e. Provide battery powered ability to access or change

selected codes and set point without AC power con­nected

f. Providetheabilitytoreprogramthe softwarethrough

theuseofamemorycard. Thememorycardautomat­icallydownloadsnewsoftwaretothecontrollerwhen
inserted.

3.2.1 Configuration Software (Configuration Vari­ables)

The Configuration Software is a variable listing of the
components available for use by the Operational
Software. This software is factory installed in
accordance withthe equipmentfitted and options listed
on the original purchase order. Changes to the
Configuration Software are required only when a new
controller hase been installed or a physical change has
beenmadetothe unit suchasthe additionor removalof
an option. A Configuration Variable list is provided in
Table 3-4. Change to the factory installed
ConfigurationSoftwareis achievedvia a configuration
card or communications.

3-3

T-309