Carrier EverFRESH Guide

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

OPERATIONS, SERVICE AND
PARTS MANUAL
For
© Carrier Corporation, 2023 Printed in U. S. A. April 2023
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
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 CO2 Injection Mode (Cd76) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7
3.5.5 Code 44 (Cd44) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7
3.5.6 Display Cd44 Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7
3.6 CONTAINER VENTING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–14
5.3.1 Removing the Water Separator and Water Drain Valve . . . . . . . . . . . . . . . . . . . 5–15
5.3.2 Replacing the Particulate Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–18

T-374 ii
5.4 EVERFRESH AIR VALVE (EA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–20
5.4.1 Removing the EverFRESH Air Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–21
5.5 EVERFRESH NITROGEN VALVE (EN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–22
5.5.1 Removing the EverFRESH Nitrogen Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–22
5.6 SENSOR ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–23
5.6.1 Replacing the Sensor Air Filter Element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–24
5.6.2 Removing the O2 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–24
5.6.3 Removing the CO2 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–24
5.7 REPLACING THE EVERFRESH CONDENSING LOOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–24
5.8 IDENTIFYING AND REPLACING ORIFICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–25
5.8.1 Replacing an Orifice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–25
EVERFRESH AND CONTAINER PRE-TRIP PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6.1 PRE-TRIP SYSTEM PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6.2 CONTAINER PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6.2.1 Box Checkout / Leak Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6.3 CONTAINER CURTAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4
6.3.1 Installing the Curtain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4
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
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–15
Figure 5.2 EverFRESH Air Valve (EA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–20
Figure 5.3 EverFRESH Nitrogen Valve (EN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–22
Figure 5.4 Sensor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–23
Figure 5.5 Nitrogen Supply and Nitrogen Sampling Orifices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–25
Figure 6.1 Pressure Connection Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2
Figure 6.2 Disc Assembly (79-04098-03) with Charging Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2
Figure 6.3 Magnehelic Gauge (Kit # 07-00177-20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3
Figure 6.4 Fresh Air Panel Collars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3
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 4–1 Alarm Indications and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
Table 4–2 Troubleshooting System Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
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 EverFRESH® 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. Venti-
late 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 eth-
ylene should not be performed.
NOTICE
It is required that the calibration procedure only be performed during Pre-Trip or when the con-
tainer 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 EverFRESH® 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) Condensing Loop
3) Water Separator
4) Particulate Filters (2)
5) Water Drain Valve (WDV)
6) Membrane Pressure Transducer (MPT)
7) EverFRESH Air Valve (EA)
8) Nitrogen Membrane Separator
9) Nitrogen Supply Orifice
10) Nitrogen Sampling Orifice
11) EverFRESH Nitrogen Valve (EN)
12) Cargo Air Sensor Inlet
13) Cargo Air Sensor Filter Assembly
14) O2 Sensor
15) CO2 Sensor
16) Cargo Air Sensor Outlet
- - - - -
1
13
14
15
16
7
11
5
34
Sensor Assembly
8
Filter Assembly
6
12
9
10
2

T-374 2–4
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.
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 EverFRESH® 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, an optional 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 per-
formed with an external ethylene scrubber (part # 30-50344-00).
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 warm, moisture laden air exits the
compressor and 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 condenses and is carried out to the filter assembly.
The filter assembly consists of a Water Separator and two Particulate Filters. Any condensed moisture is first
removed at the Water Separator and then at the first of two Particulate Filters, which removes debris and also any
additional moisture. Any condensate and solid material settles to the bottom of the filter assembly and is blown out
of the line when the Water Drain Valve (WDV) opens. The water drips onto the evaporator coil and down the
defrost drain line. The WDV energizes during the initial unit startup when the air compressor starts. It also opens
periodically during air compressor operation to remove accumulated condensate and again before the air
compressor is disengaged.
The compressed air then passes through a second Particulate Filter, to drain any remaining moisture from the
system through the EverFRESH Air Valve (EA) solenoid. This opens 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 opens the EA valve to
force clean, dry, pressurized, air into the cargo space. Since this air contains 21% oxygen, it increases the
concentration of oxygen available for respiration. Located before the EA is the Membrane Pressure Transducer
(MPT) where the controller monitors system pressure and can determine if the Nitrogen Membrane Separator is
maintaining good flow. When the EA is closed, the clean, dry air exits the Particulate Filter and enters the bottom of
the Nitrogen Membrane Separator. Inside the Separator, the air enters thousands of tiny hollow fibers. The smaller,
faster molecules of oxygen and carbon dioxide passes through the walls of the membrane fibers, exits 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. The EN is only energized during Pre-trip test
P20-5 N2 Check. Otherwise, when the EN is closed during normal operation, gas is forced out of the Nitrogen
Supply orifice. After having the oxygen level tested, the nitrogen flows through the CO2 Sensor and is then
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 Separator
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)
21) CO2 Supply Orifice Cap
22) CO2 Supply to Cargo Space
- - - - -
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. 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. Refer to 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 compo-
nents 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
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 Sequence: Test initiates with all EverFRESH and refrigeration machinery off.
Pass Criteria: Validate the MPT. Verifies the sensor is not in alarm status and reading -5 to 5 psig.
P20-1 EverFRESH Air Compressor (EAC) Test
Test Sequence: Start the EAC, open the WDV and run for 10 seconds. Close the WDV and run up to 5 minutes
or until pressure reaches 60 PSIG.
Pass Criteria: 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
Test Sequence: EAC continues running from the previous test. Record the MPT. Open the EA for 5 seconds.
Record the MPT. Shut off the EAC, wait 5 seconds and close the EA.
Pass Criteria: MPT Pressure change > 40 PSI when the EA opens. EA Current between 100 and 200mA.
P20-3 Water Drain Valve (WDV) Solenoid Test
Test Sequence: Energize the EAC and allow the system to run up to 5 minutes to build pressure. Record the
MPT. Open the WDV and record the pressure. Shut down the EAC. Wait 5 seconds, then check the WDV
current. At the end of the test, close the WDV.
Pass Criteria: MPT Pressure change > 40 PSI when the WDV opens. WDV current is between 100 and 200mA.

T-374 3–4
P20-4 CO2 and O2 Sensor Calibration
Test Sequence: “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.
Pass Criteria: 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” will be displayed.
If CO2 or O2 calibration fails, “O2 Fail” or “CO2 Fail” will be displayed 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 out-
side of this range, “O2 Fail” 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, “NoCAL” 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 Sequence: 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.
Pass Criteria: EN current is between 100 and 200mA. N2 concentration is at minimum acceptable level.
PTI Run in Units Configured for Optional CO2 Injection Kit
P20-6 CO2 Injection Valve Solenoid (CSV)
Test Sequence: Open the CSV and wait 5 seconds. Record CSV current.
Pass Criteria: CSV current is between 100 and 200 mA.
P20-7 CO2 Injection Pressure Transducer (IPT)
Test Sequence: Shut off all machinery outputs. Validate the transducer is present. Validate the transducer at 0.0
PSIG.
Pass Criteria: Validate that the IPT reads between -5 and 5 PSIG.
Table 3–1 Pre-Trip Test Codes (Continued)
Code Component Tested