Carrier TRANSICOLD EverFRESH Guide

Container Refrigeration
OPERATIONS, SERVICE, AND
PARTS MANUAL
For
EverFRESH™
Controlled Atmosphere Option
T-374 Rev C

OPERATIONS, SERVICE, AND
PARTS MANUAL
For
© Carrier Corporation, 2021 Printed in U. S. A. July 2021
EverFRESH™
Controlled Atmosphere Option

i T-374
TABLE OF CONTENTS
PARAGRAPH NUMBER PAGE
SAFETY SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1.1 GENERAL SAFETY NOTICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1.2 FIRST AID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1.3 OPERATING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1.4 MAINTENANCE PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1.5 SPECIFIC DANGER, WARNING AND CAUTION STATEMENTS . . . . . . . . . . . . . . . . . . . . . 1–1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
2.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
2.2 CONTROLLED ATMOSPHERE UNIT - COMPONENT DESCRIPTIONS . . . . . . . . . . . . . . . . 2–1
2.3 OPTIONAL CO2 INJECTION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3
2.4 SYSTEM DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2.5 SAFETY SYSTEM AND PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3.2 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3.3 EVERFRESH AIR AND GAS FLOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3.4 PRE-TRIP INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
3.4.1 Initiating a PTI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
3.4.2 PTI Individual Test Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
3.5 ENABLING EVERFRESH OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5
3.5.1 Activate Fresh Mode to Start Up the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5
3.5.2 Activate Off Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5
3.5.3 Activate or Deactivate Purge Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6
3.5.4 Code 44 (Cd44) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7
3.5.5 Display Cd44 Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7
3.6 CONTAINER VENTING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4.1 ALARMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4.2 EVERFRESH TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
5.1 MAINTENANCE SCHEDULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
5.2 EVERFRESH AIR COMPRESSOR (EAC) SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
5.2.1 Air Compressor Function Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
5.2.2 Replacing the Air Compressor Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
5.2.3 Removing the Air Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
5.2.4 Installing the Air Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
5.2.5 Air Compressor Minor Rebuild . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5
5.2.6 Air Compressor Major Rebuild . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–11
5.3 FILTER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–13
5.3.1 Removing the Water Separator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–13
5.3.2 Replacing the Particulate Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–14
5.3.3 Removing the Water Drain Valve (WDV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–16

T-374 ii
5.4 EVERFRESH AIR VALVE (EA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–18
5.4.1 Removing the EverFRESH Air Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–18
5.5 EVERFRESH NITROGEN VALVE (EN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–19
5.5.1 Removing the EverFRESH Nitrogen Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–19
5.6 SENSOR ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–20
5.6.1 Replacing the Sensor Air Filter Element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–21
5.6.2 Removing the O2 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–21
5.6.3 Removing the CO2 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–21
5.7 REPLACING THE EVERFRESH CONDENSING LOOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–22
5.8 IDENTIFYING AND REPLACING ORIFICES AND CHECK VALVES . . . . . . . . . . . . . . . . . . 5–22
5.8.1 Replacing Nitrogen Supply Orifice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–22
5.8.2 Replacing Nitrogen Sampling Orifices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–24
5.8.3 Replacing Air Compressor Check Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–25
5.8.4 Replacing Particulate Filter Check Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–25
EVERFRESH AND CONTAINER PRE-TRIP PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6.1 PRE-TRIP SYSTEM PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6.2 EVERFRESH SYSTEM PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6.3 CONTAINER PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2
6.3.1 Box Checkout / Leak Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2
6.4 CONTAINER CURTAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–5
6.4.1 Installing the Curtain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–5
PRE-GASSING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1
7.1 INITIALIZE EVERFRESH ATMOSPHERIC CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1
SCHEMATICS & DIAGRAMS - STANDARD UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–1
SCHEMATICS & DIAGRAMS - UNITS WITH CO2 INJECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–1
SERVICE PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–1
10.1 ORDERING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–1
10.2 LETTER DESIGNATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–1
11 PARTS LIST FOR COMPRESSOR KITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–1
12 PARTS LIST FOR EVERFRESH KIT (PID NT2865) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–1
13 PARTS LIST FOR SENSOR ASSEMBLY (PID NT2865) . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–1
14 PARTS LIST FOR EVERFRESH KIT (PIDS NT3000 AND HIGHER) . . . . . . . . . . . . . . . . . . 14–1
15 PARTS LIST FOR SENSOR ASSEMBLY (PIDS NT3000 AND HIGHER) . . . . . . . . . . . . . . 15–1
16 PARTS LIST FOR CONTROL BOX COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16–1
17 PARTS LIST FOR CO2 INJECTION KIT (OPTION) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17–1
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INDEX–1

iii T-374
LIST OF ILLUSTRATIONS
FIGURE NUMBER Page
Figure 2.1 Refrigeration Unit - Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Figure 2.2 Refrigeration Unit - Evaporator Section (Upper Panel Removed) . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
Figure 2.3 EverFRESH Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3
Figure 2.4 CO2 Injection System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
Figure 3.1 EverFRESH Air and Gas Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Figure 5.1 Filter Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–13
Figure 5.2 EverFRESH Air Valve (EA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–18
Figure 5.3 EverFRESH Nitrogen Valve (EN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–19
Figure 5.4 Sensor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–21
Figure 5.5 Nitrogen Supply and Nitrogen Sampling Orifices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–22
Figure 5.6 Check Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–22
Figure 6.1 Pressure Connection Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3
Figure 6.2 Disc Assembly (79-04098-03) with Charging Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3
Figure 6.3 Magnehelic Gauge (Kit # 07-00177-20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4
Figure 6.4 Fresh Air Panel Collars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4
Figure 8.1 Legend, Standard Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–1
Figure 8.2 Schematic, Standard Units - Page 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–2
Figure 8.3 Schematic, Standard Units - Page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–3
Figure 8.4 Wiring Diagram, Standard Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–4
Figure 9.1 Legend, Units with CO2 Injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–1
Figure 9.2 Schematic, Units with CO2 Injection - Page 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–2
Figure 9.3 Schematic, Units with CO2 Injection - Page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–3
Figure 9.4 Wiring Diagram, Units with CO2 Injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–4

T-374 iv
LIST OF TABLES
TABLE NUMBER Page
Table 2–1 System Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
Table 2–2 Safety and Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
Table 3–1 Pre-Trip Test Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
Table 5–1 Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
Table 5–2 EverFRESH Function Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
Table 6–1 Pre-Trip Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1

1–1 T-374
SECTION 1
SAFETY SUMMARY
1.1 General Safety Notices
The following general safety notices supplement specific warnings and cautions appearing elsewhere in this
manual. These recommended precautions 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 specific warnings and cautions
appearing elsewhere in the manual follows the general safety notices. Additional notices for Worker Safety, and
High Voltage Safety are also included.
1.2 First Aid
An injury, no matter how slight, should never go unattended. Always obtain first aid or medical attention
immediately.
1.3 Operating Precautions
Always wear safety glasses.
Keep hands, clothing and tools clear of the evaporator and condenser fans.
Wear appropriate personal protective equipment for the work being undertaken.
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.
1.4 Maintenance Precautions
Be sure power is turned OFF before servicing the EverFRESHTM Controlled Atmosphere option. 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, any necessary repairs performed by qualified service personnel.
When performing any arc welding on the container unit or refrigerated compartment, disconnect all wire harness
connectors from the modules in the control box. Do not remove wire harness from the modules unless you are
grounded to the container unit frame with a static safe wrist strap.
1.5 Specific Danger, Warning and Caution Statements
To help identify the hazards presented on the container unit labels and explain the level of awareness each one
carries, an explanation is given with the appropriate consequences:
DANGER - alert to an immediate hazard that WILL result in severe personal injury or death.
WARNING - alert to hazards or unsafe conditions that COULD result in severe personal injury or death.
CAUTION - alert to potential hazard or unsafe practice that could result in minor personal injury, product or
property damage.
The following safety statements are applicable to the EverFRESH option unit used with any container unit and
appear elsewhere in this manual. These recommended precautions must be understood and applied during
operation and maintenance of the equipment covered herein.

T-374 1–2
WARNING
!
In case of electrical fire, open circuit switch and extinguish with CO2 (never use water).
WARNING
!
Potential hazardous atmosphere and low oxygen levels may exist inside the container.
Ventilate before entering. Stay away from doors and access panels while venting. Refer to
Section 3.6.
WARNING
!
Before servicing the unit, make sure the Start-Stop switch (ST) is in the OFF position. Verify
unit circuit breaker (CB-1) and external power sources are turned OFF and tagged to prevent
accidental energizing of circuits.
WARNING
!
Do not inject gas into the container unless there is an exhaust port. Charging disk (part # 79-
04098-03) has one port for injecting gas and one for exhaust. Both ports need to be opened. If
the charging disk is not available, the manual fresh air vent must be opened. Damage to the
unit and risk of personal injury exists if a pressure relief pathway is not established.
CAUTION
!
Do not run the Calibration tests under loaded conditions.
NOTICE
While the EverFRESH option is operating, the process of inducing ripening by introducing
ethylene should not be performed.
NOTICE
It is required that the calibration procedure only be performed during pre-trip or when the
container has been fully vented.
NOTICE
Prior to performing service work, a thorough review and understanding of the entire manual is
recommended.

2–1 T-374
SECTION 2
INTRODUCTION
2.1 Introduction
This manual contains information specific to the Carrier Transicold EverFRESHTM Controlled Atmosphere option.
This manual is to be used in conjunction with the separately bound Operation and Service Manual and Service
Parts Manual for the model of your particular refrigeration unit.
The EverFRESH system is able to control container atmosphere by supplying nitrogen and oxygen into the
contained space and simultaneously controlling levels of O2 and CO2. This extends the produce ripening process,
which increases shelf life and enables longer cargo routes for certain perishable commodities. The EverFRESH
system also offers an optional package to actively inject CO2 into the cargo space during transport.
2.2 Controlled Atmosphere Unit - Component Descriptions
The refrigeration unit is designed so that the majority of its components are accessible from the front (Figure 2.1).
The air compressor for EverFRESH is located below the condenser behind a splash guard. A manually operated
venting system is located in the upper left access panel. The panel may be removed to allow entry into the
evaporator section where the atmosphere sensors, control valves, water separator and air filters are located.
Figure 2.1 Refrigeration Unit - Front
EverFRESH Air Compressor (splash guard removed)
EverFRESH components behind Access Panel

T-374 2–2
Other than the air compressor, all of the components of the EverFRESH option are mounted in the evaporator
section (Figure 2.2) in addition to the standard refrigeration unit components.
Figure 2.2 Refrigeration Unit - Evaporator Section (Upper Panel Removed)
These components (Figure 2.3) include the water separator, particulate filters, Water Drain Valve (WDV), Nitrogen
Membrane Separator, EverFRESH Air Valve (EA) and EverFRESH Nitrogen Valve (EN), CO2 and O2 sensor
package, and Membrane Pressure Transducer (MPT).
Air from within the container is passed to the O2 sensor and CO2 sensor. Data is then supplied to the controller.
The controller calculates O2 and CO2 values in order to maintain the preset values.
EverFRESH components located in evaporator section

2–3 T-374
Figure 2.3 EverFRESH Components
1) Air Compressor
2) Check Valve
3) Condensing Loop
4) Water Separator
5) Particulate Filters (2)
6) Water Drain Valve (WDV)
7) Membrane Pressure Transducer (MPT)
8) EverFRESH Air Valve (EA)
9) Nitrogen Membrane Separator
10) Nitrogen Supply Orifice
11) Nitrogen Sampling Orifice
12) EverFRESH Nitrogen Valve (EN)
13) Cargo Air Sensor Inlet
14) Cargo Air Sensor Filter Assembly
15) O2 Sensor
16) CO2 Sensor
17) Cargo Air Sensor Outlet
- - - - -
2.3 Optional CO2 Injection System
There is an optional CO2 injection kit that can be added to the system that allows CO2 to be actively injected into
the cargo space during transport. In this configuration, a CO bottle is used with a regulator to maintain an input
pressure of 50 psig, not to exceed 100 psig. There are two CO2 injection ports: one internal and one external. The
connection is a 1/4” flare fitting with a Schrader valve.
1
14
15
16
17
8
12
6
45
Sensor Assembly
9
Filter Assembly
7
13
2
10
11
3

T-374 2–4
Figure 2.4 CO2 Injection System
1) CO2 Injection Pressure Transducer (IPT)
2) CO2 Injection Solenoid Valve (CSV)
3) CO2 Supply Orifice Cap
4) Internal CO2 Port
5) External CO2 Port
- - - - -
32
4
5
1

2–5 T-374
2.4 System Data
2.5 Safety System and Protective Devices
Table 2–1 System Data
Component Data Detail
Air Compressor Number of Cylinders 2
Type Three Phase Induction
Weight 44 lbs
Full Load Amps 1.34 amps 50Hz / 1.4 amps 60Hz.
Voltage and Frequency 360 - 460 VAC 50 Hz +/-2.5Hz
400 - 500 VAC 60Hz +/-2.5 Hz
Speed 1425/50 Hz 1725/60Hz RPM
Horsepower 0.75
Protection Internal thermal protector
Resistance 16.7 ohms +/- 10%
Solenoid Valves Voltage and Frequency 18 to 30 VDC 50/60HZ +/-2.5Hz
Amperage nominal 250mA @ 24 VAC
Type AC / DC coil
Table 2–2 Safety and Protective Devices
Device Device Setting
Compressor IP Thermal
Compressor Pressure Relief Valve 147 psig +/- 3%
Control Fuses - Auto Blade Type SAE J1284 7.5 Amp
Motor Fuses - Ferraz Shawmut ATMR5 5 Amp

3–1 T-374
SECTION 3
OPERATION
3.1 Introduction
This section addresses the operating requirements for the EverFRESHTM Controlled Atmosphere option.
Operating parameters are not changed except for EverFRESH settings. For information pertaining to the operation
of the refrigeration system, refer to the Operation and Service Manual for your particular model.
3.2 Operation
The EverFRESH option offers enhanced functionality to help slow the ripening process of perishable cargo by
controlling Carbon Dioxide (CO2) and Oxygen (O2) levels to specified setpoints. This enables the fresh transport of
perishables on longer voyages. The system controls the container atmosphere with a nitrogen membrane, a fresh
air solenoid and an optional CO2 injection kit.
During the nitrogen control mode, CO2 and O2 are replaced with nitrogen proportionally. EverFRESH also utilizes
the cargo’s natural respiration to control CO2 and O2 levels. Additionally, opening and closing a fresh air valve
allows for raising O2 levels and controlling CO2 for high respiring cargos. An O2 sensor monitors O2 levels and
allows the system to prevent O2 levels from dropping below the lower setpoint. A CO2 sensor provides CO2 levels
to the controller to allow the control algorithm to activate the required EverFRESH components. For low respiring
cargoes requiring high CO2 setpoints, the CO2 injection system can be used to maintain CO2 levels.
NOTICE
While the EverFRESH option is operating, the process of removing ethylene needs to be
performed with external ethylene scrubbers.
3.3 EverFRESH Air and Gas Flow
The EverFRESH system (see Figure 3.1) uses an EverFRESH Air Compressor (EAC) mounted to the front of the
refrigeration unit to increase the pressure of the air inside the system. The higher-pressure air will exit the
compressor and go through a check valve that prevents moisture and debris from migrating back to the
compressor in the off cycle. The warm, moisture laden air is brought inside the refrigerated space and passed
through a condensing loop, consisting of a single piece of copper tubing located above the fan deck. As the
compressed air is exposed to the cooler temperature of the cargo space, moisture will condense and be carried out
to the filter assembly.
The filter assembly consists of a water separator and two particulate filters. Any of the condensed moisture will be
removed at the water separator. Immediately after the water separator is the first of two particulate filters, to
remove additional moisture and debris. The condensate and any solid material will settle to the bottom of the filter
assembly and be blown out of the line when the Water Drain Valve (WDV) opens. The water will drip onto the
evaporator coil and down the defrost drain line. The WDV will energize during the initial unit startup when the air
compressor starts. It will also open periodically during air compressor operation to remove accumulated
condensate and again before the air compressor is disengaged.
The compressed air then passes through the second particulate filter. This filter drains any remaining moisture
from the system through the EverFRESH Air Valve (EA) solenoid. This will open after the WDV operates for
draining moisture and when fresh air is required in the system. The EA maintains the desired oxygen levels inside
the cargo space. When the controller detects that oxygen levels are dropping below the threshold setting, it will
open the EA valve to force the clean, dry, pressurized, air into the cargo space. Since this air contains 21%
oxygen, it will increase the concentration of oxygen available for respiration. Just before the EA is the Membrane
Pressure Transducer (MPT) where the controller will monitor system pressure and can determine if the Nitrogen
Membrane Separator is maintaining good flow. When the EA is closed, the clean, dry air will exit the particulate
filter and enter the bottom of the Nitrogen Membrane Separator. Inside the separator, the air will enter thousands of
tiny hollow fibers. The smaller, faster molecules of oxygen and carbon dioxide will pass through the walls of the
membrane fibers, exit the separator through a port on the side, and then are exhausted out the front of the
refrigeration unit to the atmosphere. The larger, slower nitrogen molecules stay trapped in the fibers until they exit
the top of the separator.
As the nitrogen leaves the separator, it is piped above the fan deck to the nitrogen orifices. The orifices provide a
restriction that helps control the gas flow. The nitrogen supply orifice will regulate the flow of nitrogen out to the air
stream where the evaporator fans will blow it across the evaporator and down into the t-slots where it will enter the

T-374 3–2
cargo space. The nitrogen sampling orifice regulates the flow of nitrogen to the EverFRESH Nitrogen Valve (EN).
The controller will open EN to allow the gas to flow into the sensor package for testing at the O2 sensor. Elevated
amounts of oxygen indicate the nitrogen membrane may be clogged. EN is only energized during Pre-trip test P20-
5 N2 Check. Otherwise, when EN is closed during normal operation, gas is forced out of the nitrogen supply orifice.
After having the oxygen level tested, the nitrogen will flow through the CO2 sensor and then is exhausted back into
the cargo air stream above the fan deck.
On systems equipped with a CO2 Injection option, the CO2 Injection Valve (CSV) will control to the CO2 setpoint.
As CO2 levels drop below the setpoint, the CSV will open to raise CO2 levels.
Figure 3.1 EverFRESH Air and Gas Flow Diagram
1) Air Compressor
2) Condensing Loop
3) Water Separator & Particulate Filters
4) Water Drain Valve (WDV)
5) Membrane Pressure Transducer (MPT)
6) EverFRESH Air Valve (EA)
7) Fresh Air Supply to Cargo Space
8) Nitrogen Membrane
9) O2 and CO2 Sent to Ambient
10) Nitrogen Supply to Cargo Space
11) Nitrogen Orifices (supply and sampling)
12) EverFRESH Nitrogen Valve (EN)
13) O2 Sensor
14) CO2 Sensor
15) Sensor Filter Assembly
16) Cargo Air Sensor Inlet
17) Cargo Air Sensor Outlet
18) CO2 Injection Bottle (not included with equipment)
19) CO2 Injection Pressure Transducer (IPT)
20) CO2 Injection Valve (CSV) - Option
21) CO2 Supply Orifice Cap
22) CO2 Supply to Cargo Space - Option
- - - - -
2
3
4
5
6
78
9
10
12
13
14
15
16
17
1
Compressed Ambient Air
Clean Dry Air
Nitrogen
Oxygen & Carbon Dioxide
Cargo Air
Carbon Dioxide
18
20
22
Fan Deck
19
11
21

3–3 T-374
3.4 Pre-Trip Inspection
An EverFRESH Pre-Trip Inspection (PTI) is required to run prior to cargo being loaded in order to test operation of
mechanical components and calibrate the sensors. EverFRESH efficiency is directly related to box integrity, so a
PTI must only be performed with a well vented container box.
NOTE
A PTI should not be run after a frozen condition, including AUTO2.
3.4.1 Initiating a PTI
1. First, perform system maintenance checks. See Section 6.1 PTI Preparation.
2. Press the PRE-TRIP key to access the Pre-trip selection menu.
3. Use the Arrow keys to display “AutCA” and then press the ENTER key. This allows for testing of
components and calibration of O2 and CO2 sensors.
4. To skip the sensor calibrations and test only the mechanical components, use the Arrow keys to display
“P20” then press the ENTER key.
3.4.2 PTI Individual Test Codes
When testing components and troubleshooting the system, individual Pre-trips can be initiated from inside the Pre-
trip selection menu by selecting "P20". This code is for EverFRESH PTI machinery only. During the individual
"P20" tests, sensor calibration will be skipped. Current readings for the EverFRESH Air Compressor (EAC)
contactor and solenoid valves are taken internally on the ML5 controller.
Table 3–1 Pre-Trip Test Codes
Code Component Tested Test Sequence Pass Criteria
Component Acronyms Referenced: Membrane Pressure Transducer (MPT), EverFRESH Air Compressor
(EAC), Water Drain Valve (WDV), EverFRESH Air Valve (EA), EverFRESH Nitrogen Valve (EN)
P20-0 Membrane Pressure
Transducer (MPT)
Test
Test initiates with all EverFRESH
and refrigeration machinery off.
Validate the MPT. Verifies the sensor is
not in alarm status and reading -5 to 5
psig.
P20-1 EverFRESH Air
Compressor (EAC)
Test
Start EAC and open WDV and run
for 10 seconds. Close WDV and run
up to 5 minutes or until pressure
reaches 60 PSIG.
EAC Current draw > 1.0 amps.
MPT in range 60 to 135 PSIG.
EAC Contactor current in range 350 to
760 mA.
P20-2 EverFRESH Air Valve
(EA) Solenoid Test
EAC continues running from
previous test. Record MPT. Open
EA for 5 seconds. Record MPT.
Shut off EAC, wait 5 seconds and
close EA.
MPT Pressure change > 40 PSI when
EA opens.
EA Current between 100 and 200mA.
P20-3 Water Drain Valve
(WDV) Solenoid Test
Energize EAC and allow the system
to run up to 5 minutes to build
pressure. Record MPT. Open WDV
and record pressure. Shut down the
EAC. Wait 5 seconds, then check
WDV current. At the end of the test,
close WDV.
MPT Pressure change > 40 PSI when
WDV opens.
WDV Current between 100 and 200mA.

T-374 3–4
P20-4 CO2 and O2 Sensor
Calibration
“CAL” will be displayed on the left
display and a 10-minute countdown
timer is displayed on the right
display. The unit will run High
Speed Evaporator Fans.
Note: Calibration only run when
AutCA selected. Skipped if P20
selected.
The CO2 sensor and O2 sensor will
perform an auto calibration provided the
sensor signal is valid and values are
consistent with ambient air.
Error messages when calibration
fails:
The CO2 sensor will be validated and
then needs to read between 0.9 and
1.15 VDC to ensure fresh air is present
in the sensor prior to calibration. If the
level is not reached, “NoCAL” message
will be displayed.
If CO2 or O2 calibration fails, “O2 Fail” or
“CO2 Fail” will be on the display and the
test will stop.
The O2 sensor will be validated to verify
it is within a specific range suitable for
calibration. If voltage is outside of this
range, an “O2 Fail” message is
displayed.
During calibration, the stability of the
sensor will be monitored and must be
within 20mV over one minute to ensure
the sensing chamber is properly flushed
with fresh air. If it’s not stable, a “NoCAL”
message will be displayed.
In the event of a “NoCAL”, it indicates
that fresh air is not going through the
sensors. Verify there is no cargo in the
contained space, the sensor filter is not
clogged and sensor hoses are properly
connected. Then re-run the Pre-trip
“AutCA” test under the PRE-TRIP key
menu.
P20-5 EverFRESH Nitrogen
Valve (EN) Solenoid
Test
Test will start with EAC off.
Energize EN and wait 5 seconds.
Energize EAC. Test will run up to
an additional 300 seconds or until
N2 reaches acceptable limit. Then
the EAC and EN will be de-
energized.
EN current between 100 and 200mA.
N2 concentration at minimum
acceptable level.
PTI Run in Units Configured for Optional CO2 Injection Kit
P20-6 CO2 Injection Valve
Solenoid (CSV)
Open CSV and wait 5 seconds.
Record CSV current.
CSV current between 100 and 200 mA.
P20-7 CO2 Injection
Pressure Transducer
(IPT)
Shut off all machinery outputs.
Validate the transducer is present.
Validate transducer at 0.0 PSIG.
Validate IPT reads between -5 and 5
PSIG.
Table 3–1 Pre-Trip Test Codes
Code Component Tested Test Sequence Pass Criteria

3–5 T-374
3.5 Enabling EverFRESH Operation
EverFRESH is activated via function code Cd71. This code allows the user to select a specific mode of operation
and the associated parameters. The modes of operation are: FrESh, OFF, and PUrgE. Within each of these modes
of operation are sub menus that have selectable parameters. Not all parameters are available in each sub menu.
When setting any mode of operation, the entire process must be followed to ensure all parameters are set. For
example, the CO2 injection option is turned on / off under FrESH mode after passing through the CO2 and O2
setpoint sub menus.
3.5.1 Activate Fresh Mode to Start Up the System
In Fresh mode, all EverFRESH operations are enabled and setpoints for CO2 and O2 can be edited. The CO2
injection parameters in the Fresh mode menu are only available if unit configured with the CO2 injection option.
NOTE
The CO2 setpoint is the level of CO2 allowed for the cargo. The range is 1 to 19% in 1% increments,
with a default setting of 5%.
NOTE
The O2 setpoint is the minimum level of oxygen allowed for the cargo. The range is 2 to 17% in 1%
increments; the default setting is 10%.
1. Press the CODE SELECT key on the keypad.
2. Press the Up or Down Arrow key until “Cd 71” is displayed, then press the ENTER key. The selection in the
right display will blink.
3. Press the Up or Down Arrow key until “FrESh” is in the right display, then press the ENTER key.
4. The CO2 setpoint is displayed. “CO2SP” appears in the left display with the setpoint value blinking in the
right display. Use the Arrow keys to change the setpoint and press ENTER to confirm. Or, just press ENTER
to keep the originally displayed value.
5. Next, the O2 setpoint is displayed. “O2 SP” appears in the left display with its setpoint blinking in the right
display. Use the Arrow keys to change the setpoint and press ENTER to confirm. Or, just press ENTER to
keep the originally displayed value.
6. Next, “CO2iN” is displayed. Use the Arrow keys to toggle between “OFF” and “On” in the right display and
press ENTER to confirm the selection. Select “On” to enable CO2 injection or “OFF” to disable.
3.5.2 Activate Off Mode
When Off mode is selected, all EverFRESH operations will be disabled. The EverFRESH solenoids will be closed.
This will be the default mode anytime a setpoint less than -1°C (30.2°F) has been selected. Whenever a setpoint
less than -1°C (30.2°F) is selected, the current EverFRESH setting will be saved.
1. Press the CODE SELECT key on the keypad.
2. Press the Up or Down Arrow key until “Cd 71” is displayed.
3. Press the ENTER key. The selection in the right display will blink.
4. Press the Up or Down Arrow key until “OFF” is displayed and then press the ENTER key.

T-374 3–6
3.5.3 Activate or Deactivate Purge Mode
When Purge mode is active, it allows the user to suspend EverFRESH operations while pre-charging gas levels in
the container. All EverFRESH control actions and alarm 929 is suspended in order to purge the container to a
desired gas concentration. When activated, Purge mode stays active for a period of time selected from the Purge
mode sub menu.
NOTE
The CO2 setpoint is the level of CO2 allowed for the cargo. The range is 1 to 19% in 1% increments,
with a default setting of 5%.
NOTE
The O2 setpoint is the minimum level of oxygen allowed for the cargo. The range is 2 to 17% in 1%
increments; the default setting is 10%.
1. Press the CODE SELECT key on the keypad.
2. Use the Arrow keys until “Cd 71” is displayed, then press the ENTER key. The selection in the right display
will blink.
3. Use the Arrow keys until “PUrgE” mode is displayed, then press the ENTER key.
4. “CO2SP” appears in the left display with the CO2 setpoint blinking in the right. Use the Arrow keys to change
the CO2 setpoint and press ENTER to confirm. Or, just press ENTER to keep the originally displayed value.
5. “O2 SP” appears in the left display with the O2 setpoint blinking in the right. Use the Arrow keys to change
the O2 setpoint and press ENTER to confirm. Or, just press ENTER to keep the originally displayed value.
6. “PUrgE” is now in the left display. Use the Arrow keys to toggle the right display to “On” or “OFF”, then press
the ENTER key.
When “OFF” is selected, Purge mode is either not activated or terminated if it was previously activated.
When “On” is selected, “tim” is in the left display with the current purge time flashing in 1 to 10 hour
increments selectable in 1 hour intervals (default 5 hours) in the right display. The “tim” value is the
amount of time EverFRESH will be held off to allow charging and settling of gases.
7. Use the Arrow keys to change the time value and press the ENTER key to confirm and enter Purge mode.
8. Purge mode is now active. During Purge mode, while the timer is counting down the display toggles
between:
• left display shows “PUrgE” and right display shows how much time remaining.
• left display shows temperature setpoint and right display shows the supply air temperature.
NOTE
If there is an alarm in the alarm list, the Purge mode countdown will not be displayed but Purge mode
is still enabled.
9. When the Purge mode timer expires, Fresh mode is enabled and the unit reverts to normal temperature
control display. Purge mode is terminated on power cycle, trip start, defrost or pre-trip.
10. To view CO2 and O2 values during Purge mode, exit Cd71 by pressing the CODE SELECT key until Cd 71
is in the left display. Then, use the up arrow to bring up Cd44 and press the ENTER key.