Carrier 69NT40-561-201 Installation and operating instructions

T−364 Rev A
OPERATION & SERVICE MANUAL
For
69NT40-561-201
Evergreen Container Refrigeration Units
Container Refrigeration

OPERATION AND SERVICE MANUAL
CONTAINER REFRIGERATION UNIT
Model
69NT40−561−201
Carrier Corporation, 2021 Printed in U. S. A. March 2021

iT-364
TABLE OF CONTENTS
PARAGRAPH NUMBER Page
GENERAL SAFETY NOTICES Safety−1.........................................................
FIRST AID Safety−1..........................................................................
OPERATING PRECAUTIONS Safety−1.........................................................
MAINTENANCE PRECAUTIONS Safety−1.......................................................
SPECIFIC WARNING AND CAUTION STATEMENTS Safety−1.....................................
INTRODUCTION 1−1..............................................................................
1.1 INTRODUCTION 1−1.....................................................................
1.2 CONFIGURATION IDENTIFICATION 1−1...................................................
1.3 FEATURE DESCRIPTIONS 1−1............................................................
1.3.1 Control Box 1−1......................................................................
1.3.2 Temperature Readout 1−1..............................................................
1.3.3 Pressure Readout 1−1.................................................................
1.3.4 Compressor 1−1......................................................................
1.3.5 Condenser Coil 1−1...................................................................
1.3.6 Evaporator 1−1.......................................................................
1.3.7 Evaporator Fan Operation 1−1..........................................................
1.3.8 Plate Set 1−1.........................................................................
1.3.9 Battery 1−1...........................................................................
1.3.10 Dehumidification 1−1..................................................................
1.3.11 USDA 1−1...........................................................................
1.3.12 Interrogator 1−1.......................................................................
1.3.13 Remote Monitoring 1−1................................................................
1.3.14 Communications Interface Module 1−2...................................................
1.3.15 Gutters 1−2..........................................................................
1.3.16 Handles 1−2..........................................................................
1.3.17 Back Panels 1−2......................................................................
1.3.18 460 Volt Cable 1−2....................................................................
1.3.19 Cable Restraint 1−2...................................................................
1.3.20 Upper Air (Fresh Air Make Up) 1−2......................................................
1.3.21 Labels 1−2...........................................................................
1.3.22 Controller 1−2........................................................................
1.3.23 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 Interface Module 2−5...................................................

ii
T-364
TABLE OF CONTENTS (Continued)
PARAGRAPH NUMBER Page
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...........................................................
2.5.1 Standard Operation 2−9................................................................
2.5.2 Economized Operation 2−9.............................................................
2.5.3 Electronic Expansion Valve 2−9.........................................................
MICROPROCESSOR 3−1..........................................................................
3.1 TEMPERATURE CONTROL MICROPROCESSOR SYSTEM 3−1..............................
3.1.1 Keypad 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 (CnF Variables) 3−3..............................................
3.2.2 Operational Software (Cd Function Codes) 3−4...........................................
3.3 MODES OF OPERATION 3−4.............................................................
3.3.1 Start up - Compressor Phase Sequence 3−4..............................................
3.3.2 Start up - Compressor Bump Start 3−4...................................................
3.3.3 Perishable Mode Temperature Control 3−4...............................................
3.3.4 Perishable Pulldown 3−4...............................................................
3.3.5 Perishable Steady State 3−4............................................................
3.3.6 Perishable Idle, Air Circulation 3−4......................................................
3.3.7 Perishable Heating 3−4................................................................
3.3.8 Perishable Dehumidification 3−5........................................................
3.3.9 Perishable Mode Cooling - Sequence of Operation 3−6.....................................
3.3.10 Perishable Mode Heating - Sequence of Operation 3−7....................................
3.3.11 Perishable Mode - Trim Heat 3−7........................................................
3.3.12 Frozen Mode - Temperature Control 3−7.................................................
3.3.13 Frozen Steady State 3−7...............................................................
3.3.14 Frozen Idle Mode 3−7.................................................................
3.3.15 Frozen “Heat” Mode 3−8...............................................................
3.3.16 Frozen Mode Cooling - Sequence of Operation 3−8........................................
3.3.17 Defrost 3−9..........................................................................
3.3.18 Automatic Defrost 3−9.................................................................
3.3.19 Defrost Initiation 3−9..................................................................
3.3.20 Defrost Interval 3−10...................................................................
3.3.21 Defrost Related Settings 3−11...........................................................
3.4 PROTECTION MODES OF OPERATION 3−11................................................
3.4.1 Evaporator Fan Operation 3−11..........................................................
3.4.2 Failure Action 3−11.....................................................................
3.4.3 Generator Protection 3−11..............................................................
3.4.4 Compressor High Temperature Protection 3−11............................................
3.4.5 Compressor Low Pressure Protection 3−11................................................
3.4.6 Perishable Mode - System Pressure Regulation 3−11.......................................

iii T-364
TABLE OF CONTENTS (Continued)
PARAGRAPH NUMBER Page
3.5 CONTROLLER ALARMS 3−11..............................................................
3.6 PRE−TRIP DIAGNOSTICS 3−12............................................................
3.7 DataCORDER 3−12........................................................................
3.7.1 Description 3−12.......................................................................
3.7.2 DataCORDER Software 3−12............................................................
3.7.3 Sensor Configuration (dCF02) 3−13......................................................
3.7.4 Logging Interval (dCF03) 3−13...........................................................
3.7.5 Thermistor Format (dCF04) 3−13.........................................................
3.7.6 Sampling Type (dCF05 & dCF06) 3−15...................................................
3.7.7 Alarm Configuration (dCF07 - dCF10) 3−15................................................
3.7.8 DataCORDER Power Up 3−15...........................................................
3.7.9 Pre-trip Data Recording 3−15............................................................
3.7.10 DataCORDER Communications 3−15.....................................................
3.7.11 USDA Cold Treatment 3−16.............................................................
3.7.12 USDA Cold Treatment Procedure 3−16...................................................
3.7.13 DataCORDER Alarms 3−17.............................................................
3.7.14 ISO Trip Header 3−17..................................................................
3.8 CONTROLLER CONFIGURATION VARIABLES 3−18..........................................
3.9 CONTROLLER FUNCTION CODES 3−19....................................................
3.10 CONTROLLER ALARM INDICATIONS 3−26..................................................
3.11 CONTROLLER PRE−TRIP TEST CODES 3−34...............................................
OPERATION 4−1.................................................................................
4.1 INSPECTION (Before Loading) 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.......................................................
4.3.2 Vent Position Sensor 4−2..............................................................
4.4 CONNECT REMOTE MONITORING RECEPTACLE 4−2......................................
4.5 STARTING AND STOPPING INSTRUCTIONS 4−2...........................................
4.5.1 Starting the Unit 4−2...................................................................
4.5.2 Stopping the Unit 4−3..................................................................
4.6 START−UP INSPECTION 4−3.............................................................
4.6.1 Physical Inspection 4−3................................................................
4.6.2 Check Controller Function Codes 4−3....................................................
4.6.3 Start Temperature Recorder 4−3........................................................
4.6.4 Complete Inspection 4−3...............................................................
4.7 PRE−TRIP DIAGNOSIS 4−3...............................................................
4.8 PROBE DIAGNOSTICS 4−4...............................................................

iv
T-364
TABLE OF CONTENTS (Continued)
PARAGRAPH NUMBER Page
TROUBLESHOOTING 5−1.........................................................................
5.1 UNIT WILL NOT START OR STARTS THEN STOPS 5−1......................................
5.2 UNIT OPERATES LONG OR CONTINUOUSLY IN 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 5−3............................................................
5.8 ABNORMAL NOISE OR VIBRATIONS 5−3..................................................
5.9 MICROPROCESSOR MALFUNCTION 5−3..................................................
5.10 NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOW 5−4..............................
5.11 ELECTRONIC EXPANSION VALVE MALFUNCTION 5−4......................................
5.12 COMPRESSOR OPERATING IN REVERSE 5−5.............................................
5.13 ABNORMAL TEMPERATURES 5−5........................................................
5.14 ABNORMAL CURRENTS 5−5..............................................................
SERVICE 6−1....................................................................................
6.1 SECTION LAYOUT 6−1...................................................................
6.2 MANIFOLD GAUGE SET 6−1..............................................................
6.3 SERVICE CONNECTIONS 6−2............................................................
6.4 PUMP DOWN THE UNIT 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 Complete System 6−3.................................................................
6.6.4 Partial System 6−4....................................................................
6.7 REFRIGERANT CHARGE 6−4.............................................................
6.7.1 Checking the Refrigerant Charge 6−4....................................................
6.7.2 Adding Refrigerant to System (Full Charge) 6−4...........................................
6.7.3 Adding Refrigerant to System (Partial Charge) 6−4........................................
6.8 COMPRESSOR 6−5......................................................................
6.8.1 Removal and Replacement of Compressor 6−5...........................................
6.9 HIGH PRESSURE SWITCH 6−6...........................................................
6.9.1 Checking High Pressure Switch 6−6.....................................................
6.9.2 Replacing High Pressure Switch 6−6.....................................................
6.10 CONDENSER COIL 6−7..................................................................
6.10.1 Condenser Coil Cleaning 6−7...........................................................
6.10.2 Condenser Coil Removal 6−7...........................................................
6.10.3 Condenser Coil Preparation 6−7........................................................
6.10.4 Condenser Coil Installation 6−7.........................................................
6.11 CONDENSER FAN AND FAN MOTOR 6−8..................................................
6.11.1 Condenser Fan Remove/Replace 6−8...................................................

vT-364
TABLE OF CONTENTS (Continued)
PARAGRAPH NUMBER Page
6.12 FILTER DRIER 6−8.......................................................................
6.13 EVAPORATOR COIL & HEATER ASSEMBLY 6−9............................................
6.13.1 Evaporator Coil Replacement 6−9.......................................................
6.13.2 Evaporator Heater Replacement 6−9....................................................
6.14 EVAPORATOR FAN AND MOTOR ASSEMBLY 6−10..........................................
6.14.1 Replacing the Evaporator Fan Assembly 6−10.............................................
6.14.2 Disassemble the Evaporator Fan Assembly 6−10...........................................
6.14.3 Assemble the Evaporator Fan Assembly 6−10.............................................
6.15 EVAPORATOR SECTION CLEANING 6−10...................................................
6.16 ELECTRONIC EXPANSION VALVE 6−11.....................................................
6.16.1 Replacing Electronic Expansion Valve and Screen 6−11.....................................
6.17 ECONOMIZER SOLENOID VALVE 6−12.....................................................
6.18 ECONOMIZER EXPANSION VALVE 6−12....................................................
6.18.1 Economizer Expansion Replacement 6−12................................................
6.19 DIGITAL UNLOADER VALVE 6−13..........................................................
6.20 VALVE OVERRIDE CONTROLS 6−14........................................................
6.21 CONTROLLER 6−15.......................................................................
6.21.1 Handling Modules 6−15.................................................................
6.21.2 Controller Troubleshooting 6−15..........................................................
6.21.3 Programming Procedure 6−15...........................................................
6.21.4 Removing and Installing a Controller 6−17.................................................
6.21.5 Battery Replacement 6−17..............................................................
6.22 TEMPERATURE SENSOR SERVICE 6−17...................................................
6.22.1 Sensor Checkout Procedure 6−17........................................................
6.22.2 Sensor Replacement 6−20..............................................................
6.22.3 Sensors STS and SRS Re-Installation 6−21................................................
6.23 VENT POSITION SENSOR (VPS) 6−22......................................................
6.24 MAINTENANCE OF PAINTED SURFACES 6−23..............................................
6.25 COMMUNICATIONS INTERFACE MODULE INSTALLATION 6−23..............................
ELECTRICAL WIRING SCHEMATICS 7−1...........................................................
7.1 INTRODUCTION 7−1.....................................................................

vi
T-364
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 Air−Cooled Condenser Section 2−4.......................................................
Figure 2−5 Control Box Section 2−5................................................................
Figure 2−6 Refrigeration Circuit Schematic −Standard Operation 2−10...................................
Figure 2−7 Refrigeration Circuit Schematic −Economized Operation 2−11................................
Figure 3−1 Temperature Control System 3−1.........................................................
Figure 3−2 Keypad 3−2...........................................................................
Figure 3−3 Display Module 3−3....................................................................
Figure 3−4 Control Module 3−3.....................................................................
Figure 3−5 Controller Operation - Perishable Mode 3−5...............................................
Figure 3−6 Perishable Mode Cooling 3−6............................................................
Figure 3−7 Perishable Mode Heating 3−7............................................................
Figure 3−8 Controller Operation - Frozen Mode 3−8...................................................
Figure 3−9 Frozen Mode 3−9......................................................................
Figure 3−10 Defrost 3−10..........................................................................
Figure 3−11 Standard Configuration Download Report 3−14.............................................
Figure 3−12 Alarm Troubleshooting Sequence 3−25....................................................
Figure 4−1 Upper Fresh Air Make Up Flow Chart 4−2.................................................
Figure 6−1 Manifold Gauge Set 6−1................................................................
Figure 6−2 R-134a Manifold Gauge/Hose Set 6−1....................................................
Figure 6−3 Service Valve 6−2......................................................................
Figure 6−4 Refrigeration System Service Connections 6−3.............................................
Figure 6−5 Compressor Kit 6−5....................................................................
Figure 6−6 High Pressure Switch Testing 6−6........................................................
Figure 6−7 Heater Arrangement 6−9................................................................
Figure 6−8 Evaporator Fan Assembly 6−10...........................................................
Figure 6−9 Electronic Expansion Valve 6−11..........................................................
Figure 6−10 Coil View of Economizer Solenoid Valve (ESV) 6−12........................................
Figure 6−11 Economizer Expansion Valve 6−12.......................................................
Figure 6−12 View of Digital Unloader Valve (DUV) Assembly 6−13.......................................
Figure 6−13 Controller Section of the Control Box 6−15.................................................
Figure 6−14 Sensor Types 6−20.....................................................................
Figure 6−15 Sensor and Cable Splice 6−20...........................................................
Figure 6−16 Supply Sensor Positioning 6−21..........................................................
Figure 6−17 Return Sensor Positioning 6−21..........................................................
Figure 6−18 Evaporator Temperature Sensor Positioning 6−21..........................................
Figure 6−19 Compressor Discharge Temperature Sensor 6−22..........................................
Figure 6−20 Communications Interface Installation 6−23................................................
Figure 7−1 LEGEND −Standard Unit Configuration 7−1...............................................
Figure 7−2 SCHEMATIC DIAGRAM 7−2............................................................
Figure 7−3 UNIT WIRING DIAGRAM 7−3...........................................................

vii T-364
LIST OF TABLES
TABLE NUMBER Page
Table 2−1 Safety and Protective Devices 2−8.........................................................
Table 3−1 Keypad Function 3−2.....................................................................
Table 3−2 DataCORDER Configuration Variables 3−13..................................................
Table 3−3 DataCORDER Standard Configurations 3−15.................................................
Table 3−4 Controller Configuration Variables 3−18......................................................
Table 3−5 Controller Function Codes 3−19.............................................................
Table 3−6 Controller Alarm Indications 3−26...........................................................
Table 3−7 Controller Pre-trip Test Codes 3−34..........................................................
Table 3−8 DataCORDER Function Code Assignments 3−40..............................................
Table 3−9 DataCORDER Pre-trip Result Records 3−41..................................................
Table 3−10 DataCORDER Alarm Indications 3−42......................................................
Table 6−1 Valve Override Control Displays 6−14........................................................
Table 6−2 Sensor Resistance 6−18...................................................................
Table 6−3 Sensor Resistance (CPDS) 6−19............................................................
Table 6−4 R-134a Temperature - Pressure Chart 6−24..................................................
Table 6−5 Recommended Bolt Torque Values 6−25.....................................................

T−364
Safety−1
SAFETY SUMMARY
GENERAL SAFETY NOTICES
The following general safety notices supplement
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. A listing of the specific
warnings and cautions appearing elsewhere in the
manual follows the general safety notices.
FIRST AID
An injury, no matter how slight, should never go unat-
tended. Always obtain first aid or medical attention im-
mediately.
OPERATING PRECAUTIONS
Always wear safety glasses.
Keep hands, clothing and tools clear of the evaporator
and condenser fans.
No work should be performed on the unit until all circuit
breakers and start-stop switches are turned off, and
power supply is disconnected.
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, dis-
connecting and securing the power plug.
Be sure power is turned off before working on motors,
controllers, solenoid valves and electrical control
switches. Tag circuit breaker and power supply to pre-
vent accidental energizing of circuit.
Do not bypass any electrical safety devices, e.g. bridg-
ing an overload, or using any sort of jumper wires. Prob-
lems with the system should be diagnosed, and any
necessary repairs performed by qualified service per-
sonnel.
When performing any arc welding on the unit or contain-
er, disconnect all wire harness connectors from the
modules in control boxes. Do not remove wire harness
from the modules unless you are grounded to the unit
frame with a static safe wrist strap.
In case of electrical fire, open circuit switch and extin-
guish with CO2(never use water).
SPECIFIC WARNING AND CAUTION STATEMENTS
To help identify the label hazards on the unit and explain
the level of awareness each one carries, an explanation
is given with the appropriate consequences:
DANGER - means an immediate hazard that WILL re-
sult in severe personal injury or death.
WARNING - means to warn against hazards or unsafe
conditions that COULD result in severe personal injury
or death.
CAUTION - means to warn against potential hazard or
unsafe practice that could result in personal injury, prod-
uct or property damage.
The statements listed below are applicable to the refrig-
eration unit and appear elsewhere in this manual. These
recommended precautions must be understood and ap-
plied during operation and maintenance of the equip-
ment covered herein.
WARNING
EXPLOSION HAZARD: Failure to follow this
WARNING can result in death, serious
personal injury and / or property damage.
Never use air or gas mixtures containing
oxygen (O2) for leak testing or operating the
product.
Charge Only With R−134a: Refrigerant must
conform to AHRI Standard 700
specification.
WARNING
Beware of unannounced starting of the
evaporator and condenser fans. The unit
may cycle the fans and compressor unex-
pectedly as control requirements dictate.
WARNING
Do not attempt to remove power plug(s) be-
fore turning OFF start-stop switch (ST), unit
circuit breaker(s) and external power
source.
WARNING
Make sure the power plugs are clean and
dry before connecting to power receptacle.
WARNING
Make sure that the unit circuit breaker
(CB-1) and the START-STOP switch (ST) are
in the “O” (OFF) position before connecting
to any electrical power source.

Safety−2
T−364
WARNING
Make sure power to the unit is OFF and
power plug disconnected before replacing
the compressor.
WARNING
Before disassembly of the compressor, be
sure to relieve the internal pressure very
carefully by slightly loosening the cou-
plings to break the seal.
WARNING
Do not use a nitrogen cylinder without a
pressure regulator.
WARNING
Do not remove the condenser fan grille
before turning power OFF and disconnect-
ing power plug.
WARNING
Always turn OFF the unit circuit breaker
(CB-1) and disconnect main power supply
before removing electrical parts.
WARNING
Always turn OFF the unit circuit breaker
(CB-1) and disconnect main power supply
before working on moving parts.
WARNING
Installation requires wiring to the main unit
circuit breaker, CB1. Make sure the power to
the unit is off and power plug disconnected
before beginning installation.
CAUTION
Charge receiver according to nameplate
specifications to ensure optimal unit per-
formance.
CAUTION
Do not remove wire harnesses from con-
troller 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.
CAUTION
Do not attempt to use an ML2i PC card in an
ML3 equipped unit. The PC cards are physi-
cally different and will result in damage to
the controller.
CAUTION
Pre-trip inspection should not be per-
formed with critical temperature cargoes in
the container.
CAUTION
When Pre-Trip key is pressed, economy and
dehumidification will be deactivated. At the
completion of Pre-Trip activity, economy
and dehumidification must be reactivated.

T−364
Safety−3
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 comple-
tion without being interrupted, the unit will
terminate pre-trip and display “Auto 2”
“end.” The unit will suspend operation until
the user depresses the ENTER key!
CAUTION
Allowing the scroll compressor to operate
in reverse for more than two minutes will re-
sult in internal compressor damage. Turn
the start-stop switch OFF immediately.
CAUTION
To prevent trapping liquid refrigerant in the
manifold gauge set be sure set is brought to
suction pressure before disconnecting.
CAUTION
The scroll compressor achieves low
suction pressure very quickly. Do not use
the compressor to evacuate the system
below 0 psig. Never operate the
compressor with the suction or discharge
service valves closed (frontseated). Internal
damage will result from operating the
compressor in a deep vacuum.
CAUTION
Take necessary steps (place plywood over
coil or use sling on motor) to prevent motor
from falling into condenser coil.
CAUTION
The unit must be OFF whenever a program-
ming card is inserted or removed from the
controller programming port.
CAUTION
Use care when cutting wire ties to avoid
nicking or cutting wires.
CAUTION
Do not allow moisture to enter wire splice
area as this may affect sensor resistance.

1−1T−364
SECTION 1
INTRODUCTION
1.1 INTRODUCTION
The Carrier Transicold model 69NT40−561−201 series
units are of lightweight aluminum frame construction,
designed to fit in the front of a container and serve as the
container’s front wall.
They are one piece, self−contained, all electric units,
which include cooling and heating systems to provide
precise temperature control.
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 (Hz) power. Control system power
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 3
microprocessor. The controller operates automatically
to select cooling, holding or heating as required to
maintain the desired set point temperature within very
close limits. The unit may also be equipped with an
electronic temperature recorder.
The controller has a keypad and display for viewing or
changing operating parameters. The display is also
equipped with lights to indicate various modes of
operation.
1.2 CONFIGURATION IDENTIFICATION
Unit identification information is provided on a plate
located on the back wall of the condenser section. The
plate provides the unit model number, the unit serial
number and the unit parts identification number (PID).
The model number identifies the overall unit
configuration, while the PID number provides
information on specific optional equipment, factory
provisioned to allow for field installation of optional
equipment and differences in detailed parts.
1.3 FEATURE DESCRIPTIONS
1.3.1 Control Box
Units are equipped with an aluminum control box.
1.3.2 Temperature Readout
The unit is fitted with suction and discharge refrigerant
temperature sensors. The sensor readings may be
viewed on the controller display.
1.3.3 Pressure Readout
The unit is fitted with evaporator, suction, and discharge
pressure transducers. The transducer readings may be
viewed on the controller display.
1.3.4 Compressor
The unit is fitted with a scroll compressor equipped with
suction and discharge service connections.
1.3.5 Condenser Coil
The unit is fitted with a four−row square formed
condenser coil using 7mm tubing.
1.3.6 Evaporator
The evaporator section is equipped with an electronic
expansion valve (EEV).
1.3.7 Evaporator Fan Operation
Units are equipped with three−phase evaporator fan
motors. Opening of an evaporator fan internal protector
will shut down the unit.
1.3.8 Plate Set
Each unit is equipped with a tethered set of wiring
schematics and wiring diagram plates. The plate sets
are ordered using a seven−digit base part number and a
two−digit dash number.
1.3.9 Battery
The refrigeration controller has a rechargeable battery
pack that has been fitted to the ML3 controller.
1.3.10 Dehumidification
The unit is fitted with a humidity sensor. This sensor
allows setting of a humidity set point in the controller. In
dehumidification mode, the controller will operate to
reduce internal container moisture level.
1.3.11 USDA
The unit is supplied with fittings for additional
temperature probes which allow recording of USDA
Cold Treatment data by the integral DataCORDER
function of the Micro−Link refrigeration controller.
1.3.12 Interrogator
Units have the DataCORDER function and are fitted
with interrogator receptacles for connection of
equipment to download the recorded data. Two
receptacles are fitted; one is accessible from the front of
the container and the other is mounted inside the
container (with the USDA receptacles).
1.3.13 Remote Monitoring
The unit is fitted with a remote monitoring receptacle.
This item allows connection of remote indicators for
COOL, DEFROST and IN RANGE. The receptacle is
mounted at the control box location.

1−2
T−364
1.3.14 Communications Interface Module
The unit is fitted with a communications interface
module. The communications interface module is a
slave module, which allows communication with a
master central monitoring station. The module will
respond to communication and return information over
the main power line. Refer to the ship master system
technical manual for further information.
1.3.15 Gutters
Rain gutters are fitted over the control box and recorder
section to divert rain away form the controls.
1.3.16 Handles
The unit is equipped with handles to facilitate access to
stacked containers. These fixed handles are located on
either side of the unit.
1.3.17 Back Panels
Aluminum back panels are bolted.
1.3.18 460 Volt Cable
A 460 volt power cable and plug designs are installed for
the main 460 volt supply.
1.3.19 Cable Restraint
A bungee cord style cable restraint is available for
storage of the power cables.
1.3.20 Upper Air (Fresh Air Make Up)
The unit is fitted with an upper fresh air makeup
assembly. The fresh air makeup assembly is equipped
with a vent positioning sensor (VPS).
1.3.21 Labels
Safety Instruction and Function Code listing labels are
supplied in English and Traditional Chinese.
1.3.22 Controller
Two replacement controllers are available:
1. Re−manufactured −Controller is the equivalent of a
new OEM controller and is supplied with a 12−month
warranty.
2. Repaired −Controller has had previous faults re-
paired and upgraded with the latest software.
Note: Repaired controllers are NOT to be used for
warranty repairs; only full OEM Remanufactured
controllers are to be used.
Replacement controllers will be factory−equipped with
the latest version of operational software, but will NOT
be configured for a specific model number and will need
to be configured at the time of installation or sale.
1.3.23 Condenser Grille
The unit is equipped with direct bolted grilles.

T-364
2−1
SECTION 2
DESCRIPTION
2.1 GENERAL DESCRIPTION
2.1.1 Refrigeration Unit −Front Section
The unit is designed so that the majority of the compon-
ents are accessible from the front (see Figure 2−1). The
unit model number, serial number and parts identifica-
tion number can be found on the serial plate on the back
wall of the condenser section.
2.1.2 Fresh Air Makeup Vent
The function of the upper makeup air vent is to provide
ventilation for commodities that require fresh air circula-
tion. A manually operated venting system is located in
the upper left access panel.
1
2
4
10
14
11
8
9
15
16
5
6
7
12
13
3
1. Access Panel (Evap. Fan #1)
2. Fork Lift Pockets
3. Control Box
4. Unit Display
5. Control Panel
6. Remote Monitoring Receptacle
7. Start−Stop Switch, ST
8. Compressor
9. Compressor Cover
10. Supply Temperature Supply/Recorder Sensor
Assembly (STS/SRS)
11. Economizer
12. Ambient Temperature Sensor (AMBS)
13. Serial Plate
14. Power Cables and Plug (Location)
15. Condenser Grille
16. Upper Fresh Air Makeup Vent
Panel (Evap. Fan #2)
Figure 2−1 Refrigeration Unit −Front Section

2−2T-364
2.1.3 Evaporator Section
The evaporator section is shown below. 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.
Most evaporator components are accessible by remov-
ing the upper rear panel (as shown in the illustration) or
by removing the evaporator fan access panels (see
Figure 2−1).
1
2
3
4
5
6
7
8
9
10
11
12
13
1. Evaporator Fan Motor #1 (EM1)
2. Return Recorder Sensor/Temperature Sensor
(RRS/RTS)
3. Humidity Sensor (HS)
4. Evaporator Fan Motor #2 (EM2)
5. Evaporator Coil Heaters (Underside of Coil)
6. Evaporator Coil
7. Electronic Expansion Valve (EEV)
8. Evaporator Temperature Sensors (Location)
(ETS1 & ETS2)
9. Interrogator Connector (Rear) (ICR)
10. USDA Probe Receptacle PR2
11. USDA Probe Receptacle PR1
12. USDA Probe Receptacle PR3
13. Cargo Probe Receptacle PR4
Figure 2−2 Evaporator Section

T-364
2−3
2.1.4 Compressor Section
The compressor section includes the compressor,
digital unloader valve (DUV), high pressure switch,
discharge pressure transducer (DPT), evaporator
pressure transducer (EPT) and the suction pressure
transducer (SPT).
The supply temperature sensor, supply recorder sensor
and ambient sensor are located to the left of the com-
pressor.
1
23
45
6
7
8
910 11
12
13
14
15
COMPRESSOR COVER
REMOVED FOR CLARITY
1. Compressor
2. Compressor Discharge Temperature Sensor
(CPDS) (Location)
3. Discharge Connection
4. Suction Connection (Location)
5. Compressor Terminal Box
6. Oil Drain (Location)
7. Economizer Connection
8. Discharge Pressure Transducer (DPT)
9. Digital Unloader Valve (DUV)
10. Suction Pressure Transducer (SPT)
11. Evaporator Pressure Transducer (EPT)
12. High Pressure Switch (HPS)
13. Discharge Service Valve
14. Suction Service Valve
15. Warning Label
Figure 2−3 Compressor Section