Trailer & Rail Refrigeration

ALARM

START/STOP

CONTINUOUS

DEFROST

MENU

I START/RUN

O OFF

OPERATOR’S MANUAL
for the
X4 7300/7500
Trailer & Rail Refrigeration Units

62-11644 Rev B
 OPERATOR’S
MANUAL
for the
X4t 7300/7500
Trailer & Rail Refrigeration Units

©2014 Carrier Corporation D Printed in U. S. A. November 2014

 TABLE OF CONTENTS
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Unit Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Display Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Starting Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Inspect Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
IntelliSett . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operator Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Pretrip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Changing Setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Start-Stop or Continuous Operation . . . . . . . . . . . . 18
Data Recorder / Trip Start . . . . . . . . . . . . . . . . . . . . . 20
Manual Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Unit Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Alarm List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
View Hour Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Stopping Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Emergency Bypass Mode . . . . . . . . . . . . . . . . . . . . . 31
Pretrip Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Product Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Recommended Transport Temperatures . . . . . . . . 35
General Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 36
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . 40
Priming Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . 43
Emergency Road Service . . . . . . . . . . . . . . . . . . . . . 44

62−11644
INTRODUCTION
This guide has been prepared for the operator of a Carrier Transicold
X4t 7300/7500 Trailer or Rail refrigeration unit with APXt Control
System. It contains basic instructions for the daily operation of the
refrigeration unit as well as safety information, troubleshooting tips, and
other information that will help you to deliver the load in the best possible
condition. Please take the time to read the information contained in this
booklet and refer to it whenever you have a question about the
operation of this Carrier Transicold unit.

This refrigeration unit has been engineered to provide long, trouble-free

performance when it is properly operated and maintained. The checks
outlined in this guide will help to minimize over-the-road problems. In
addition, a comprehensive maintenance program will help to insure that
the unit continues to operate reliably. Such a maintenance program will
also help to control operating costs, increase the unit’s working life, and
improve performance.

This guide is intended as an introduction to this unit and to provide

general assistance when needed. More comprehensive information
can be found in the Operation & Service Manual for this unit. This
manual can be obtained from your Carrier Transicold dealer.

When having this unit serviced, be sure to specify genuine Carrier

Transicold replacement parts for the highest quality and best reliability.

At Carrier Transicold, we are continually working to improve the

products that we build for our customers. As a result, specifications may
change without notice.

1 62-11644
UNIT IDENTIFICATION
Each unit is identified by a decal attached to the frame of the unit inside
the roadside side door. This decal is on the bottom vertical frame next
to the display. The decal identifies the model number of the unit, the
warranty ID number, the serial number, the type of refrigerant and
refrigerant charge.
If a concern arises, please refer to the information on this decal, and
make a note of the model and serial number before calling for
assistance. This information will be needed when you contact an
authorized Carrier Transicold Dealer so that they may properly assist
you.

Nameplate
Athens Ga.

Model Name: X4 7500

Serial No: ###########
Model No: NDW236##-##-#
Warranty ID: ######
Refrigerant: R404A
Standby:
Max. Op. Press. LP: 100psig/HP: 465psig
Manufacturer ’s Warranty Statement:

See dealer for warranty coverage

details.

DATE IN SERVICE
MONTH YEAR
1 2 3 2011
4 5 6 2012
7 8 9 2013
10 11 12 2014
DAY
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31
Made in the United States of America

(Sample)

62-11644 2
SAFETY

WARNING
Unit may start automatically at any time even if the switch
is in the OFF position. Use proper lockout/tagout proce-
dures before inspection/servicing. All unit inspection/
servicing by properly trained personnel only.
This Carrier Transicold refrigeration unit has been designed with the
safety of the operator in mind. During normal operation, all moving parts
are fully enclosed to help prevent injury. During any inspection or
servicing with the doors open you may be exposed to moving parts;
please stay clear of all moving parts when the unit is in operation.

NOTE TO TECHNICIANS
Refer to the Operation & Service Manual for a complete list
of safety precautions.
AUTO-START
This refrigeration unit is equipped with Auto-Start in both Start-Stop and
Continuous Operation. The unit may start at any time. A buzzer will
sound for 5 seconds before the unit is started. When performing any
check of the refrigeration unit (e.g., visually checking belts, checking
the oil), place unit in Inspect Mode and disconnect the starter solenoid
connector.
COOLING SYSTEM
The engine is equipped with a pressurized cooling system including a
pressurized coolant bottle. Under normal operating conditions, the
coolant in the engine and radiator is under high pressure and is very hot.
Contact with hot coolant can cause severe burns. Do not remove the
cap from a hot coolant system; if cap must be removed, cover it with a
rag and remove very slowly in order to release pressure without spray.
REFRIGERANT
The refrigerant contained in the refrigeration system of this unit can
cause frostbite, severe burns, or blindness when in direct contact with
the skin or eyes. For this reason (and because of legislation regarding
the handling of refrigerants) we recommend that you contact your
nearest Carrier Transicold authorized repair facility whenever service
of the refrigerant system is required.
BATTERY
This unit may be equipped with a lead-acid type battery. The battery
normally vents small amounts of flammable hydrogen gas. Do not
smoke when checking the battery. A battery explosion can cause
serious physical harm and/or blindness.

3 62-11644
STARTING UNIT

ALARM

START/STOP

START/STOP DIESEL COOL

CONTINUOUS

36 .2
DEFROST

MENU
BOX TEMPERATURE 5F
36
SETPOINT 5F

STATUS OK

I START/RUN

O OFF

4 1
3

WARNING
Under no circumstances should ether or any
other starting aids be used to start the engine.

WARNING
Unit may start automatically at any time even if
the switch is in the OFF position. Use proper
lockout/tagout procedures before inspection/
servicing. All unit inspection/servicing by
properly trained personnel only.

62-11644 6
STARTING UNIT - CONTINUED

1. Place the START/RUN-OFF switch in the START/RUN position.

2. The system will display the Carrier Transicold logo, display the
default screen, present language selection and the hour meter
readings (if configured to do so) along with a test flash of the
alarm light. The system will then perform a start sequence, ener-
gize the buzzer, and then start the unit automatically.
3. If there is an alarm present, the alarm message will be displayed
in the MessageCenter and the alarm LED will flash for 5 sec-
onds. If one or more shutdown alarms are present, the alarm(s)
must be cleared before the unit will start.
4. Observe the MessageCenter. If the word “ACTIVE” or
“MODIFIED” is displayed at the right, the unit is equipped with
IntelliSett settings; for more information refer to the IntelliSet
section of this book.

7 62-11644
INSPECT MODE

Inspect Mode provides an additional layer of safety for operators

and technicians. Inspect Mode should be used during all pretrip
inspections of the unit.

Inspect Mode is a user activated feature that forces the unit to

shutdown and remain in shutdown regardless of operating state.

After unit inspection, Inspect Mode must be manually disabled, at

which point the unit will resume standard operation.

Inspect Mode is not a substitute for proper Lockout/Tagout

procedures, which are always required when servicing the unit.

ALARM

START/STOP

START/STOP DIESEL COOL

36.2
CONTINUOUS

DEFROST

MENU BOX TEMPERATURE 5F

36
SETPOINT 5F
INSPECT EXIT
MODE

1 2

Enter Inspect Mode:

1. With the system powered up (START/RUN-OFF switch in the
START/RUN position) press the MENU key until INSPECT
MODE is displayed.
2. Press the INSPECT MODE soft key, the unit will shut down.

62-11644 8
INSPECT MODE - CONTINUED

While the unit is in Inspect Mode the ALARM light will flash, and the
display will indicate that unit operation, including temperature
control, has been disabled.

Exit Inspect Mode:

3. While the unit is in Inspect Mode, the EXIT soft key will be
available, all other keys and functions will be locked out.
4. Press the EXIT soft key to disable Inspect Mode, the unit will
resume standard operation.

ALARM

START/STOP

NO TEMPERATURE
START/STOP DIESELCONTROLCOOL

36.2
CONTINUOUS
INSPECT MODE
DEFROST
OPERATIONS DISABLED

MENU BOX TEMPERATURE 5F

36
Press EXIT to return to normal
operation SETPOINT 5F
EXIT
TECH INSPECT EXIT
MODE MODE

9 62-11644
STOPPING UNIT

ALARM

START/STOP

START/STOP DIESEL COOL

CONTINUOUS

36.2
DEFROST

MENU
BOX TEMPERATURE 5F
36
SETPOINT 5F
STATUS OK

I START/RUN

O OFF

To stop the unit, place the START/RUN-OFF switch in the

OFF position. The refrigeration system and engine will shut
down immediately while the control system completes a shut
down sequence, and then the display will go blank.

NOTES
The system will close the compressor suction modulation
valve (CSMV) and evaporator expansion valve (EVXV) be-
fore turning off.
Due to internal processing, turning the START/RUN - OFF
switch OFF then back to the START/RUN position will result
in a 4 to 50 second delay between the display going off and
coming back on again.

WARNING
Unit may start automatically at any time even if the switch
is in the OFF position. Use proper lockout/tagout proce-
dures before inspection/servicing. All unit inspection/
servicing by properly trained personnel only.

62-11644 30
EMERGENCY BYPASS MODE

In the event of an alarm caused by a failure of the display module,

the refrigeration unit will go into shutdown. In order to temporarily
bypass this shutdown state, Emergency Bypass Mode can be
activated.

Once Emergency Bypass Mode has been activated, the

refrigeration unit will operate normally for 24 hours, a countdown
timer will be shown on the display. This 24 hour window of operation
will keep the load safe, and provide enough time to contact the
nearest Carrier Transicold Service Center for repair of the unit.

ALARM

START/STOP

START/STOP DIESEL COOL

36.2
CONTINUOUS

DEFROST

MENU BOX TEMPERATURE 5F

36
SETPOINT 5F
INSPECT BYPASS EXIT
MODE MODE

1 2
Enter Emergency Bypass Mode:
1. When the refrigeration unit is in a shutdown state due to the
display module alarm, press the MENU key until BYPASS
MODE is displayed.
2. Press the BYPASS MODE soft key, the unit will resume
operation until Emergency Bypass Mode is disabled, or after 24
hours of unit operation in Emergency Bypass Mode.

Exit Emergency Bypass Mode:

3. Press the MENU key until the EXIT BYPASS soft key is
displayed.
4. Press the EXIT BYPASS soft key, the refrigeration unit will shut
down. Once Emergency Bypass Mode is turned off, it cannot be
restarted and the unit will remain in shutdown until it is repaired.
After repairs have been made and the display module alarm has
been cleared, the unit will operate normally and Emergency Bypass
Mode will no longer be available.

31 62-11644
PRETRIP INSPECTION
The Pretrip Inspection should be performed before picking up any load.
This inspection is essential to ensure reliable operation of this unit.
These checks take only a few minutes.

WARNING
Unit may start automatically at any time even if the switch
is in the OFF position. Use proper lockout/tagout proce-
dures before inspection/servicing. All unit inspection/
servicing by properly trained personnel only.

BEFORE STARTING ENGINE

Place unit in Inspect Mode and disconnect starter solenoid
connector
Drain water from bottom of fuel tank
Drain water from water separator on fuel filter (if applicable)
Check radiator coolant level
Check air cleaner indicator
Check engine oil level
Visually check condition of belts
Check door latches & hinges
Check battery cables for rubbing or chafing
Check battery terminals for cleanliness
Check channels or “T” bar floor as well as return air bulkhead for
cleanliness and obstruction. Channels and return air bulkhead
must be free of debris for proper air circulation.
Check air chute
Exit Inspect Mode and reconnect starter solenoid connector
Start unit and place in continuous operation
IMMEDIATELY AFTER STARTING ENGINE
Visually check fuel lines and filters for leaks
Visually check oil lines and filters for leaks
Visually check coolant hoses for leaks
Visually check exhaust system for leaks
Verify correct air flow of condenser fan*
* Place a small rag in front of the condenser coil, the rag should hold. If the
rag blows away it means that the fan is rotating in reverse.

62-11644 32
PRETRIP INSPECTION - CONTINUED
AFTER 15 MINUTES OF OPERATION
Initiate defrost and allow to terminate automatically
Check defrost drain line for blockage and proper water flow
PRETRIP
Initiate Pretrip
List any Pretrip alarms
FINAL
Enter trip start in micro
COMMENTS / NOTES

33 62-11644
GENERAL TROUBLESHOOTING

WARNING
Unit may start automatically at any time even if the switch
is in the OFF position. Use proper lockout/tagout proce-
dures before inspection/servicing. All unit inspection/
servicing by properly trained personnel only.

Everything possible has been done to ensure that this unit is the most
reliable, trouble-free equipment available today. If, however you are
having an issue, the following section may be of assistance.

If you do not find the trouble that you have experienced listed, please
call your Carrier Transicold dealer for assistance.

62-11644 36
GENERAL TROUBLESHOOTING - CONTINUED
General Troubleshooting
Unit won’t crank. Check alarm list.
Visually check battery condition.
Visually check battery connections.
Check all fuses.
Unit won’t start. Check alarm list.
Check fuel level.
Check all fuses.
Unit won’t run. Check alarm list.
Check fuel level.
Check engine oil level.
Check all fuses.
Unit stops operating. Check alarm list.
Visually check belts.
Check engine oil level.
Visually check coolant level.
Check fuel level.
Check all fuses.
Unit not cooling/heating Check alarm list.
properly. Initiate Manual Defrost of unit, refer to
Manual Defrost section.
Check for proper air circulation in the
refrigerated compartment.
Check condenser for airflow restric-
tion.
Check refrigerated compartment for
damage or air leaks.

37 62-11644
FUSES - CONTINUED

WARNING
When replacing fuses, lockout/tagout the negative bat-
tery cable.

Fuse Purpose Amps

F1 Module/Buzzer Power 5A
F3 Engine Control Unit Power 5A
F5 Power Enable Relay Contact Power 30A
AutoFresh Air Exchange
F6 Solenoid Power 10A

F7 Main Power 80A

F8 Fuel Level Sensor Power 5A
Main Microprocessor Module
F10 Component Actuation Power 20A

F11 Light Bar Power 5A

F12 Satellite Communications Power 5A
F14 Fuel Heater Power 15A

39 62-11644
 WARNING
Unit may start automatically at any time even if the switch
is in the OFF position. Use proper lockout/tagout proce-
dures before inspection/servicing. All unit inspection/
servicing by properly trained personnel only.
SYSTEM OPERATION
a. Pretrip Inspections
1 Pretrip Inspection - See Pretrip section
2 Run Microprocessor Pretrip - Before loading
3 Check Engine Hours
b. Every Service Interval or Yearly
Engine 1 Check engine oil and filter change interval
2 Check low oil pressure switch
3 Clean crankcase breather
4 Check fuel injectors every 1,500 hours*
5 Check injection pump every 3,000 hours*
6. Check & adjust engine valves every 4,000 hours
Fuel 1 Clean mechanical and electric (if equipped) fuel
System pump screens
2 Change fuel filter
3 Check fuel heater (if equipped)
Cooling 1 Check coolant change interval. If replacement is
System not required, check antifreeze concentration us-
ing a refractometer (Carrier Transicold P/N
07-00435-00)
2 Clean condenser/radiator surfaces
3 Check water pump
4 Check water temperature sensor
Exhaust 1 Check mounting hardware
System 2 Check muffler and exhaust pipes
Air Intake 1 Change air cleaner element
System 2 Check & reset air cleaner indicator
Starting 1 Clean battery connections & cable ends
Circuit 2 Check battery hold down clamps
3 Check battery condition
4 Check starter operation
*Based on EPA 40 CFR Part 89

41 62-11644
MAINTENANCE SCHEDULE - CONTINUED
b. Every Service Interval or Yearly (Continued)
Charging 1 Check alternator brushes, replace if needed
Circuit 2 Check alternator output
Unit 1 Check unit mounting bolts
2 Check engine & compressor mounting bolts
3 Check door latches & hinges
4 Check all belt tensions, adjust as necessary
5 Check gearbox and fanshaft for oil leaks
6 Check fanshaft, idler and gearbox bearings
7 Check clutch air gap, adjust as required
Refrigeration 1 Check compressor drive coupling
System 2 Check defrost air switch & calibrate as necessary
3 Remove bulkhead (if equipped); check & clean
the evaporator coil and all defrost drain hoses
4 Install manifold gauge set & check refrigerant
pressure
5 Run APX Control System Pretrip
6 Check manual defrost operation
Electrical 1 Check unit switches and electrical connections
System 2 Check condition of all modules
c. 5 year or 12,000 Hour Maintenance
Coolant 1 Drain and flush cooling system.
System 2 Refill with Extended Life Coolant
d. Oil Change Intervals
Oil Type Oil Change / ESI Filter Change
Petroleum 3000 hours or 2 years
(Maximum oil drain interval is 2 years)
Mobile Delvac 1* 4000 hours or 2 years
(Maximum oil drain interval is 2 years)
*Mobil Delvac 1 is the only approved synthetic oil

These maintenance schedules are based on the use of approved oils

and regular pretrip inspections of the unit. Failure to follow the
recommended maintenance schedule may affect the life and reliability
of the refrigeration unit.

62-11644 42
PRIMING FUEL SYSTEM
The mechanical fuel lift pump is mounted on the engine next to the
injection pump. This pump has a manual plunger for priming the fuel
system when the fuel tank has been run dry.

WARNING
Keep clear of rotating belts and pulleys.
To prime the fuel system, use the following steps:
1. Turn the bleed valve (Red) counter-clockwise until fully opened.
2. Turn the top of the manual fuel pump plunger counter-clockwise to
unlock it. S-L-O-W-L-Y (up/down once per second) pump the
manual plunger until positive pressure (resistance) is felt. This may
take up to 200 strokes. Positive pressure indicates fuel flow.
3. Continue to pump S-L-O-W-L-Y (up/down once per second)
approximately 100 more strokes to fill the filter and bleed the air out
of the lines.
4. Start engine. It may be necessary to continue to pump until the
engine starts.
NOTE
Running the engine for an extended period of time with the
manual plunger up can cause a priming pump failure.
5. Depress and turn the top of the manual plunger clockwise to lock in
place.
6. When engine is running smoothly, turn bleed valve clockwise until
fully closed.

Red
Fuel Bleed
Valve

Manual
Fuel Pump
Plunger

43 62-11644
EMERGENCY ROAD SERVICE
At Carrier Transicold we’re working hard to give you complete service
when and where you need it. That means a worldwide network of
dealers that offer 24−hour emergency service. These service centers
are manned by factory trained service personnel and backed by
extensive parts inventories that will assure you of prompt repair.
Should you experience a problem with your unit during transit, follow
your company’s emergency procedure or contact the nearest Carrier
Transicold service center. Consult the Shortstop Service Centers
directory or visit www.trucktrailer.carrier.com and click on “Dealer
Locator” to locate the service center nearest you. The Shortstop
directory may be obtained from your Carrier Transicold dealer.
You can also download the Carrier Transicold North America
Truck/Trailer Dealer Locator App to your smart phone. The Dealer
Locator app provides:
S Location information for every Carrier Transicold dealer in North
America
S The nearest dealer from your present location
S Dealer look−up capability
S Dealer services (Trailer, Truck, APU, Mobile Support, etc.)
S Addresses
S Maps to easily find dealers
S Directions and navigation to the dealerships
S Phone number and 24−hour emergency hotlines, where available
S Auto dialing
S Hours of operation
S Link to dealer website
S Ability to add dealers to Contacts

To download the Carrier Transicold

North America Truck/Trailer Dealer
Locator App, scan this QR code, or
go directly to your App store.

If you are unable to reach a service center, call our 24−hour Action Line:
(800) 448−1661.

We will do everything we can to get your problem taken care of by an

authorized CTD dealer and get you back on the road.

62-11644 44
 INDEX
A L
Alarm List, 28 Language Selection, 24
Auto−Start, 3
M
B Maintenance, 40
Battery, 3 Maintenance Schedule, 40

C O
Continuous Operation, 18 Operator Messages, 12
Cooling System, 3
P
D Pretrip Inspection, 32
Data Recorder, 20 Pretrip, 14
Defrost, Manual, 22 Priming Fuel System, 43
Display, 4 Product Loading, 34
Display Screens, 5
R
E Recommended Transport
Emergency Bypass Mode, 31 Temperatures, 35

Emergency Road Service, 44 Refrigerant, 3

F S
Fuses, 38 Safety, 3
Setpoint, Changing, 16
G Start−Stop Operation, 18
General Troubleshooting, 36 Starting Unit, 6
Stopping Unit, 30
H
Hour Meters, 29
T
Trip Start, 20
I
Inspect Mode, 8
U
IntelliSet, 10 Unit Data, 25
Introduction, 1 Unit Identification, 2

Index -1 62−11644