Carrier 69NT40-551-001 - User Manual

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Container Refrigeration

T -- 320 R ev A

OPERATION AND SERVICE

for

69NT40--551--001 TO 199

Container Refrigeration Units

Main Page

Questions and Answers

W
walterkempNov 3, 2025
Why won't my Carrier Refrigerator start and then stops?
- J
  Joe WebbNov 3, 2025
  If your Carrier Refrigerator won't start or starts and then stops, there are several potential causes: * The external power source might be off; in this case, turn it on. * The start-stop switch could be off or defective; check it. * A circuit breaker may have tripped or is off; check the breaker. * The control transformer may be defective; consider replacing it. * A fuse (F3A/F3B) might be blown; check the fuse. * There may be low line voltage or single phasing; check these. Additionally, internal components like the evaporator fan motor, condenser fan motor, or compressor might have an open internal protector. The high-pressure switch could be open, or the heat termination thermostat might be open and need replacement. Loss of communication with the expansion module or a ma...
A
Adam HernandezNov 18, 2025
Why is my Carrier Refrigerator running constantly?
- X
  xsingletonNov 18, 2025
  If your Carrier Refrigerator is operating long or continuously in cooling mode, it could be due to several reasons: * A hot load (which is normal). * Defective box insulation or an air leak; repair it. * A shortage of refrigerant. * The evaporator coil is covered with ice or plugged with debris. * Evaporator fan(s) rotating backwards. * A defective evaporator fan motor/capacitor. * Air bypass around the evaporator coil; check it. * The controller is set too low; reset it. * Compressor service valves or liquid line shutoff valve partially closed; open valves completely. * A dirty condenser. * A worn compressor. Additionally, the current limit might be set to the wrong value, the suction modulation valve may have lost track of the step count (power cycle it), or there...

Summary

Safety Summary

General Safety Notices

General safety notices supplement specific warnings and cautions for operation and maintenance.

First Aid

Procedure for handling injuries, emphasizing immediate medical attention.

Operating Precautions

Precautions for safe operation, including safety glasses and working in pairs.

Maintenance Precautions

Precautions for maintenance, including power disconnection and safety devices.

Specific Warning and Caution Statements

Explanation of DANGER, WARNING, CAUTION levels and applicable unit statements.

Section 1 Introduction

1.1 Introduction

Overview of Carrier Transicold model 69NT40-551-001/199 series units.

1.2 Configuration Identification

Details on identifying unit model, serial number, and parts identification number.

1.3 Option Description

Description of various factory or field-equipped options for the base unit.

Section 2 Description

2.1 General Description

General description of the unit's components and accessibility.

2.2 Refrigeration System Data

Technical data for the refrigeration system components.

2.3 Electrical Data

Electrical specifications for unit components.

2.4 Safety and Protective Devices

List and explanation of safety and protective devices.

2.5 Refrigeration Circuit

Description of the unit's refrigeration circuit operation modes.

Section 3 Microprocessor

3.1 Temperature Control Microprocessor System

Overview of the Micro-Link 3 system: keypad, display, control module.

3.2 Controller Software

Description of Configuration and Operational software functions.

3.3 Modes of Operation

Details on perishable and frozen modes, including conventional and economy.

3.4 Controller Alarms

Explanation of controller alarm generation and display.

3.5 Unit Pre-Trip Diagnostics

Description of the pre-trip diagnostic function and test routines.

3.6 DataCORDER

Overview of the DataCORDER system for data logging and retrieval.

Section 4 Operation

4.1 Inspection (Before Starting)

Pre-operation inspection checklist for the unit.

4.2 Connect Power

Instructions for connecting power to the unit.

4.3 Adjust Fresh Air Makeup Vent

Procedure for adjusting fresh air makeup vent settings.

4.6 Starting and Stopping Instructions

Procedures for starting and stopping the unit.

4.8 Pre-Trip Diagnosis

Detailed steps for performing pre-trip diagnosis.

4.10 Sequence of Operation

General sequences for cooling, heating, and defrost operations.

Section 5 Troubleshooting

5.1 Unit Will Not Start or Starts Then Stops

Troubleshooting guide for units that fail to start or stop intermittently.

5.3 Unit Runs But Has Insufficient Cooling

Troubleshooting guide for units with insufficient cooling.

5.4 Unit Will Not Heat or Has Insufficient Heating

Troubleshooting guide for units that will not heat or have insufficient heating.

5.6 Unit Will Not Defrost Properly

Troubleshooting guide for units that do not defrost properly.

5.8 Abnormal Noise or Vibrations

Troubleshooting guide for abnormal noise or vibrations from the compressor or fans.

5.9 Controller Malfunction

Troubleshooting guide for controller malfunctions.

Section 6 Service

6.1 Section Layout

Overview of the service section layout.

6.2 Manifold Gauge Set

Description and use of the manifold gauge set.

6.3 Refrigeration System Service - Standard Piping

Service procedures for units with standard piping.

6.5 Compressor

Information on compressor service, removal, and replacement.

6.6 Compressor Oil Level

Procedures for checking and managing compressor oil levels.

6.7 High Pressure Switch

Procedures for replacing and checking the high pressure switch.

6.10 Water Cooled Condenser Cleaning

Procedure for cleaning the water-cooled condenser.

6.12 Expansion Valves

Information on expansion valves, including checking superheat and replacement.

6.18 Suction Modulation Valve

Procedures for pre-checking and checking the suction modulation valve.

6.20 Controller

Guidelines for handling, troubleshooting, and programming the controller.

6.23 Electronic Partlow Temperature Recorder

Procedures for replacing and changing the chart on the temperature recorder.

6.25 Composite Control Box Repairs

Instructions for repairing cracks, chips, holes, and inserts in the control box.

Section 7 Electrical Wiring Schematics

7.1 Introduction

Introduction to electrical schematics and wiring diagrams.

Carrier 69NT40-551-001 Specifications

General

Brand	Carrier
Model	69NT40-551-001
Category	Refrigerator
Language	English

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