Carrier Aspen Operator's Manual
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Carrier Aspen Operator's Manual

Carrier Aspen Operator's Manual

Auxiliary power unit (apu)
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Operator's Manual
Aspen™
Auxiliary Power Unit (APU)
62-12172

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Questions and answers

James Theron Garnett
April 23, 2025

My unit will not stay running Code reads check AC

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1 comments:
Mr. Anderson
May 11, 2025

The error code "check AC" on a Carrier Aspen unit that will not stay running may indicate a problem with the AFCI/GFCI-protected power outlet or engine block heater. If these components are not functioning, the AFCI/GFCI device may have tripped. The device has a status indicator that shows the cause of the fault. If the indicator is OFF or shows a RED light and will not reset, it suggests a potential problem requiring service.

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Preston Thomas
April 8, 2025

My new Carrier aspen apu say not communicating and it's not starting

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1 comments:
Mr. Anderson
April 9, 2025

Your Carrier Aspen APU may not be communicating and not starting due to several possible reasons:

1. Truck Engine Interlock: If the truck engine is running and the interlock is enabled, the APU will not start. If the APU is running and the truck engine starts, the APU will shut down.

2. APU Not Powered On: The APU must be started for operation. If it is not in engine or shore power mode, the interface screen will be blank.

3. Wrong Start Procedure: Ensure the correct start procedure is followed—press the ON/OFF button to start the APU.

4. Maintenance Reminder: If maintenance intervals are not followed, it may affect performance. Check if a maintenance notification is active.

5. Fleet Configuration Settings: Some features may be disabled based on fleet settings, which could affect startup or communication.

Check these factors to identify the issue.

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Jeff
April 2, 2025

How can I use the outlet while the APU is on but not running

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1 comments:
Mr. Anderson
April 2, 2025

You cannot use the outlet on a Carrier Aspen APU while it is ON but not running. The 120 VAC power outlet only operates when the system is running.

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Jeff walker
March 24, 2025

My new aspen apu will not turn on

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1 comments:
Mr. Anderson
March 24, 2025

The Carrier Aspen APU may not turn on for several reasons:

1. Power Source Issue – Ensure the APU is properly connected to a power source. If switching from shore power, confirm the shore power extension cord is disconnected and the system has switched to APU power.

2. Activation Procedure Not Followed – The APU requires pressing and holding the on/off button on the Aspen interface for 1 second to initiate the start sequence.

3. Battery or Electrical Problem – If the battery is low or the electronics are damaged, the APU may not start. Check the battery status and electrical connections.

4. Engine Block Heater Connection – If using the Aspen STA model, ensure the engine block heater is properly connected and functioning.

5. System Malfunction or Corrosion – Inspect the block heater connector and other components for damage or corrosion that might prevent proper operation.

If the issue persists, further troubleshooting or service may be required.

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Dale Palmer
March 26, 2025

See last comment

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Dale Palmer
March 26, 2025

Why does my non standalone carrier aspen apu keep coding A05100 AC Check and stall engine? I cleaned filter under bunk, replaced the serpentine belt, doesn't do this except on heat

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Summary of Contents for Carrier Aspen

  • Page 1 Operator’s Manual Aspen™ Auxiliary Power Unit (APU) 62-12172...
  • Page 2 Carrier Transicold dealer. When having your 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, unit specifications may change without notice.

  • Page 3: Unit Identification

    If a concern arises, refer to the information on this decal and make a note of the model and serial numbers before calling for assistance. This is required when you contact an authorized Carrier Transicold dealer so that they may properly assist you.
  • Page 4 2.1 Aspen Models AspenINT Provides air conditioning and heating to the truck cab. The 120 VAC outlet is available to power most 120 VAC appliances and electronics. Cooling system is integrated into the truck cooling system, allowing the APU to warm the truck engine.
  • Page 5 3 Safety This Carrier Transicold APU 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 covers off you may be exposed to moving parts. Stay clear of all moving parts when the unit is in operation.
  • Page 6 3.2 Specific Warning, Caution, and Notice Statements The following statements are specific to this APU and appear elsewhere in this manual. These recommended precautions must be understood and applied during operation and maintenance of the equipment covered herein. California Proposition 65 Warning: The APU and CCU components of this product contain lead, a chemical known to the State of California to cause cancer and birth defects, and other reproductive harm.
  • Page 7 Once automatic functions are set, the system could start at any time. Before servicing the unit, disconnect the unit from the batteries to prevent injury should the unit attempt to start while servicing. All presets will remain once battery cable is reconnected. If the message “DISCONNECT STARTER”...
  • Page 8 If equipped, the truck engine oil or block heater connector is independent from APU “comfort system” functions and is energized as soon as APU engine starts. The block or oil heater must be plugged into the connector when required during cold weather operation. Unplug the block heater connector from the block heater receptacle when not in use.
  • Page 9 Hazard Cautions Preventative Actions • Low voltage battery and cable connections have electrical current capable of • welding tools or other Disconnect the battery cables prior to working on metallic objects if they the APU. • contact battery terminals or Direct contact of internal electrolyte liquid with eyes Voltage connections.
  • Page 10 Hazard Cautions Preventative Actions • Use personal protective equipment. • Ensure adequate ventilation. • Combustible liquid. • Material can create slippery conditions. Diesel • May cause cancer. • Fuel Avoid contact with skin, eyes, and clothing. • Irritating to eyes and skin. •...
  • Page 11 Hazard Cautions Preventative Actions • Components may be heavy Wear proper personal protective equipment to Heavy enough to cause personal prevent injuries from falling objects. • Objects Use proper equipment when moving heavy objects injuries or death if they are •...
  • Page 12 4 Components Aspen Interface (AI) 120 VAC Power Outlet Condenser Climate Control Unit (CCU) Truck Batteries Fuel Lines Truck Fuel Tank Auxiliary Power Unit (APU) Coolant Lines...
  • Page 13 4.1 Aspen Power Unit The APU is mounted on the frame of the truck. It consists of an engine and belt driven generator. Fuel for the engine is drawn from the truck fuel tank. The APU provides power to the Climate Control Unit (CCU).

  • Page 14: Cooling System

    4.2 Cooling System 4.2.1 Integrated Cooling System The integrated APU is plumbed into the truck’s coolant system. The APU and the tractor share the same coolant reservoir. When the integrated APU is running, it provides heat to the truck’s engine and when the truck’s engine is running, the truck provides heat to the APU.
  • Page 15 4.2.2 Stand-Alone Cooling System The Stand-Alone APU cooling system is self-contained and does not plumb into the truck’s cooling system. Coolant level can be checked through the sight glass on the surge tank. The surge tank is mounted remotely away from and above the APU, where the sight-glass is easily visible. The surge tank is connected to the APU with coolant hoses.

  • Page 16: Electrical System

    4.3.1 Aspen Interface The Aspen Interface (AI) is the user control for the system. The AI turns the unit ON, OFF, and allows the user to select the mode of operation. 1. ON/OFF Button – Turns the power unit ON and OFF 2.
  • Page 17 Home Screen - The home screen is the default screen when the system is ON. The cab, set, and outside temperatures are displayed on the home screen. The time is also shown on the home screen. Current fan speed is indicated on the left side of the screen. 1.
  • Page 18 4.3.2 Power Outlet The power outlet is mounted in truck sleeper. Provides 120 VAC (15A max) to power hotel loads. Outlet is arc fault and ground fault protected (AFCI/GFCI).

  • Page 19: Hvac System

    4.4 HVAC System The HVAC system is made up of several components that provide heating, air conditioning, and fans to the truck cab. CCU - Typically mounted under the bunk, the CCU is the heart of the HVAC system. The CCU contains the AC and heating components as well as the fan Condenser - The condenser is mounted on the outside of the truck.

  • Page 20: Features And Functions

    5 Features and Functions Aspen APUs have many features and functions that provide driver comfort, improved truck reliability, and fuel savings. The primary feature is to provide climate control for the cab when the truck is not running. Manual and automatic modes of operation are available.
  • Page 21 5.2 Functions Comfort Monitor (Automatic Operation) - During Comfort Monitor mode, the system automatically switches between cooling and heating modes to maintain the desired setpoint. When the system is first started, fan speed may automatically adjust to bring the cab temperature to setpoint faster than it would using the selected fan speed.
  • Page 22 Maintenance Reminder - Notifies the operator when maintenance interval is approaching. Ensures preventative maintenance is performed at the correct interval. Interval settings can be adjusted to align with existing fleet maintenance schedules. Truck Engine Interlock - The APU is intended to be run when the truck engine is not running. When the interlock is enabled, it prevents the APU from starting when the truck engine is running.

  • Page 23: Operation

    6 Operation The Aspen Interface (AI) is used to control the operation of the system. When the APU is not running in engine or shore power mode the AI screen will be blank. The APU must be started to begin operation.
  • Page 24 When the Auto Start feature in enabled, the APU engine will start/stop each time that the truck key switch is cycled. The APU will automatically start without operator input at the Aspen Interface. Disable the Auto Start feature and perform the appropriate Lockout/Tagout procedures before performing any service or inspection.
  • Page 25 6.2 Run Mode (Heating, Air Conditioning, or Fans) The user must select a run mode before the heating, air conditioning, or fans will operate. • HVAC OFF – Power Unit and HVAC system is turned OFF. If outlet is enabled, the power unit will continue to run.
  • Page 26 6.3 Run Mode Select 1. There are two methods to access the RUN MODE SELECT menu • Press and hold the dial for two seconds. The screen will change to the RUN MODE SELECT screen. • Press menu button from the home screen and then push the dial to select RUN MODE SELECT from the menu.
  • Page 27 6.4 Adjust Setpoint 1. From the home screen push in the dial button. The current setpoint will be shown on screen along with the word SET. 2. Adjust the setpoint by rotating the dial left to lower temperature or right to increase temperature. Note that the CAB signifies the current cabin temperature.

  • Page 28: Adjust Fan Speed

    6.5 Adjust Fan Speed Fan speed is adjusted from the home screen by rotating the dial. • Rotating the dial to the left decreases fan speed. • Rotating to the right increases fan speed. • An on-screen indicator will display fan speed when using the dial. •...
  • Page 29 6.6 Setup Display options can be adjusted from the setup menu to suit the user preference. The items that can be adjusted from the setup menu include: • Time and Date • Units • Brightness • Auto Dim • Language To access the setup menu 1.
  • Page 30 6.6.1 Time/Date 1. Press the menu button from the home screen. 2. Rotate the dial and select the SETUP option. 3. Press the dial to choose TIME. The current date and time are displayed on screen. 4. Press the dial button and then rotate the dial to your option of choice.
  • Page 31 6.6.2 Units The displayed temperature units can be switched between Celsius and Fahrenheit. 1. Press the menu button from the home screen. 2. Rotate the dial to select SETUP and press the dial. 3. Rotate the dial to select UNITS and press the dial. 4.
  • Page 32 6.6.3 Brightness The display brightness can be increased or decreased. The value can be adjusted from 10% (darkest) to 100% (brightest). 1. From the home screen press the menu button. 2. Rotate the dial and select SETUP. Press the dial. 3.
  • Page 33 6.6.4 Auto Dim The auto dim feature automatically reduces the display brightness when the Aspen Interface is not in use by the operator. This feature can be turned ON or OFF. When turned OFF the display brightness will not change and will remain at the brightness value selected.
  • Page 34 6.7 Service The service menu contains information, reminders, and self-tests that help ensure reliable operations and maintenance of the Aspen APU. Features of the service menu include: • Unit Information - Serial number and software information • Maintenance - Displays hours until next PM is required •...
  • Page 35 6.7.1 Unit Information The unit information submenu displays the APU serial number and current software version 1. From the home screen press the menu button. 2. Rotate the dial and select SERVICE. Press the dial. 3. Rotate the dial to select UNIT INFORMATION. Press the dial.
  • Page 36 6.7.2 Alarms Active alarms can be viewed in the alarm menu 1. From the home screen press the menu button. 2. Rotate the dial and select SERVICE. Press the dial. 3. Rotate the dial to select ALARMS. Press the dial. 4.
  • Page 37 1. From the alarm menu rotate the dial to the end of the alarm list, select RESET and press the dial. 2. Press the dial for one second to clear the alarm. If the alarm returns further action is required. Contact you Carrier Transicold dealer for assistance.
  • Page 38 6.7.4 Data The data screen displays temperature and voltage information. 1. From the home screen press the menu button. 2. Rotate the dial and select SERVICE. Press the dial. 3. Rotate the dial to select DATA. Press the dial. 4. Temperature and voltage information will be displayed.
  • Page 39 6.7.5 DPF Regen For units equipped with the ClearSky emission control system, the Diesel Particulate Filter (DPF) regen menu will be available. The DPF regen feature allows the user to monitor the status of a current regeneration or initiate a manual regeneration 1.

  • Page 40: Run Mode

    6.8 Run Mode Automatic run mode functions can be turned ON and OFF from the run mode menu. Contact a Carrier Transicold dealer for assistance configuring the automatic run mode functions. The automatic run modes that can be configured are: •...

  • Page 41: Shore Power

    7 Options 7.1 Shore Power The shore power option allows HVAC functions to operate off an external 120 VAC power source instead of running the diesel engine. When operating in shore power mode, the 120 VAC power source is automatically switched between the APU and shore power connection. The default power source is the APU.
  • Page 42 7.1.1 Switching from Diesel to Shore Power 1. Turn OFF the APU at the Aspen Interface (AI). 2. Connect to shore power cable to the 120 VAC shore power receptacle. 3. The SPM will automatically switch to shore power. 4. Turn on the APU from the AI.
  • Page 43 7.2 Engine Block Heater (Aspen STA Only) The Aspen STA model may be equipped with a connector that supplies power for an engine block heater. The purpose of this feature is to provide power for the engine block heater to warm the truck engine during cold weather operation.
  • Page 44 When enabled, the block heater will be powered when the APU is running. The block heater function can be turned ON and OFF through the Aspen Interface (AI). The engine block heater features an Arc Fault Circuit Interrupter/ Ground Fault Circuit Interrupter (AFCI/ GFCI), which provides protection to the block heater circuit against the unwanted effects of arc and ground faults.
  • Page 45 7.3 Carrier Cabin Heater The Carrier Cabin Heater option utilizes diesel fuel as the heat source instead of the electric CCU heater. When enabled, the air heater will run when the unit is in a heating mode; the CCU heater is disabled.

  • Page 46: Maintenance

    8 Maintenance For the most reliable operation and for maximum life, this APU requires regular maintenance. This includes oil and filter changes, fuel filter and air cleaner replacement and coolant replacement. Maintenance should be performed by properly trained personnel according to the schedule listed in section 8.1. Pre-trip inspections should be performed before every trip.

  • Page 47: Preventative Maintenance

    Preventative maintenance should be performed according to the schedule listed below. Refer to Operation and Service Manual (62-12174) for detailed service procedures and specifications. Inspect Clean Adjust/Test/Torque Change Every Every 1000 1000 Hours Hours Every Every 2000 2000 Hours Hours Table 8.1 Aspen APU Preventative Maintenance Schedule...

  • Page 48: Pre-Trip Inspection

    8.2 Pre-trip Inspection The pre-trip inspection is essential to ensure reliable operation of the Aspen APU. The Pre-trip Inspection should be performed before operating the unit. These checks take only a few minutes. Before Starting APU Engine After Starting APU Engine...
  • Page 49 8.2.1 Top Cover Removal and Installation Performing the pre-trip inspection requires removal of the top cover of the APU. The top cover does not require tools for removal Removal Unscrew the hand knob located on the top of the APU Pull the latch handles down and out to release Once the cover holes are clear of the posts, slide the Grab both sides of the cover and pull out to clear posts...
  • Page 50 Installation Grab the sides of the cover and insert the back edge Push the cover toward the back of the APU until the between the flange bracket and APU frame. posts extend past the cover on both sides. Insert the hand knob through the hole in the flange Pull latch handles down and over the keeper.
  • Page 51 8.2.2 Checking Engine Oil Level 1. Turn the APU OFF and wait at least 5 minutes to allow the engine oil to return to the oil pan. 2. Remove the dipstick (shown in red) from the engine. 3. Wipe the dipstick with a clean cloth. 4.
  • Page 52 8.2.3 Checking Coolant Level Aspen-INT 1. The Aspen-INT uses the same coolant and DO NOT open the coolant tank cap coolant reservoir as the truck. Refer to the truck when engine and coolant is HOT. owner’s manual for coolant level check procedure.

  • Page 53: Specifications

    8200 BTU/hr 340 cfm 6 speed Air Heater (Optional) 7,000 BTU/hr Power Outlet 120 VAC 15 A (AFCI/GFCI Protected) Engine Block Heater 120 VAC 15 A (AFCI/GFCI Protected) Shore Power (Input) 120 VAC 15 A Table 8.3 Aspen APU Specification...
  • Page 54 8.3.1 Engine Oil Selection Table 8.3.1 Engine Oil Grade Temperature Ranges...
  • Page 55 9 AFCI/GFCI The power outlet and engine block heater utilize an AFCI/GFCI device to protect the electrical system and user while in use. During operation no input is required from the operator for the device to function. If the power outlet or block heater is not functioning, the AFCI/GFCI device may have tripped. The status indicator on the device shows the potential cause of the fault.
  • Page 56 Contact Carrier Transicold Dealer Solid Green Press TEST button and RESET button. If RED indicator light continues or will not RESET, contact Carrier Transicold Dealer Device has tripped and the self-test function detects a potential problem, press RESET. If RED indicator light...

  • Page 57: Fuse Locations

    10 Fuse Locations 10.1 APU Fuses The APU fuses are located under the right-side cover of the power unit. Top, bottom, and right-side covers must be removed to access the fuses. Do not inspect or change fuses while the system is running. Replacement fuses must have the appropriate rating.
  • Page 58 10.2 Option/Truck Fuses The location of the option and truck fuses will vary from one truck to another. The fuses are typically located: • Truck interlock - Under the dash of the truck on near the truck fuse panel • Air heater option –...

  • Page 59: Road Service

    11 Road Service Carrier Transicold works hard to provide complete service when and where it is needed. That means a 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 a prompt repair.
  • Page 60 North America Carrier Transicold Carrier Transicold Ejercito Nacional 253-A Piso 5 700 Olympic Drive Colonia Anahuac 11320 Mexico D.F. Athens, GA 30601 USA ©2023 Carrier Corporation. Printed in USA 0 /23. Carrier, Carrier Transicold is a registered trademark of Carrier Corporation.

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