Aeris System Troubleshooting Sept 2013 STEMCO Aeris Troubleshooting Manual Part Number: 01-571-8301 Revised: 9/13 Rev: A AerisTM by STEMCO, an advanced automatic tire inflation system based on patented rotary sealing technology and precision electronic airflow detection. The system is designed to keep commercial trailer tires properly inflated using air pressure from the trailer’s air system.
Aeris System Troubleshooting Sept 2013 Table of Contents General View of Aeris Components Installed………………………………………………………3 Explanation of Words………….……………………………………………………………………………..4 Important Safety Notices…..…………………………………………………………………….…………5 General Service Information………….……………………………………………………….………….6 Aeris System Features…………….………………………………………………………………………….7 System Pre Checks…………….……………………………………………………………………………....9 How System Works…………..………………………………………...........................................
Aeris System Troubleshooting Sept 2013 General Information General View of Aeris Components Installed Page 3 of 18
Aeris System Troubleshooting Sept 2013 About This Manual This manual is provided to support the STEMCO Aeris tire inflation system. The manual provides the following information needed to service and troubleshoot the Aeris system. Explanation of Words Please pay attention to special symbols used through this manual to convey important information. Hazard signal words such as DANGER, WARNING, CAUTION, or NOTICE are used throughout this manual.
Aeris System Troubleshooting Sept 2013 Important Safety Notices • Proper maintenance, service and repair are important to the operation and reliability of the trailer suspension system and its components. The procedures recommended by STEMCO as described in this manual are methods of performing maintenance, inspection, repair and service. All warnings and cautions should be read carefully to help prevent personal injury and to help assure proper installation methods are used.
Aeris System Troubleshooting Sept 2013 General Service Information Before starting any work or installation, read, understand and comply with the following: • Read all instructions and procedures. • Company’s service, maintenance, installation and troubleshooting procedures. • Manufacturer’s vehicle safety instructions when working on the vehicle. • Manufacturer’s vehicle instructions not detailed in this service manual.
Aeris System Troubleshooting Sept 2013 System Features • Tire pressure is continuously monitored and adjusted automatically to the target tire pressure. • Adjustable air pressure regulator is used for setting desired tire pressure target. • An indicator light will illuminate when air is flowing to the tires. • Does not pressurize axle tube (prevent contamination of seals). • Rotary seal air leakage will not enter the wheel end, preventing oil contamination on the hubcap.
Aeris System Troubleshooting Sept 2013 System Operation How System Works • The Aeris tire inflation system is designed to continuously supply filtered, regulated compressed air to each tire on the trailer. There is no operation required of the driver for the system to function normally. The only requirement of the driver is to verify the indicator lamp is functioning and to monitor the system periodically. • The Aeris system is preset to maintain a specific tire pressure in each tire.
Aeris System Troubleshooting Sept 2013 Condition Possible Causes Actions The Driver Warning Lamp is ON. The system is delivering air during initial system charging for a slow leak on tire of 2-3 psi The system is functioning correctly. The system is delivering air to a leaking tire. Repair the tire. The system is delivering air to a leaking system component. Repair the system component. The system wiring is incorrect. Correct the system wiring.
Aeris System Troubleshooting Sept 2013 Aeris System Function Test THIS MUST BE COMPLETED BEFORE BEGINNING SYSTEM TROUBLESHOOTING Power on Test – This is referenced throughout the troubleshooting procedures and consist of connect air and power supply to the trailer while watching Driver Warning Lamp on the nose of the trailer Important initial steps: Initially do not connect air supply or power until instructed below • • • Verify valve on control box is open and pressure regulator is set to desired pressu
Aeris System Troubleshooting Sept 2013 Condition: Driver Warning Lamp does not come on at all Possible Causes: Loose, broken or corroded connection or wires, bad bulb or bad control box circuit board Before starting this section Verify power and ground connections supplying the trailer Verify control box is wired correctly (see figure 3 on page 18) CAUTION: DO NOT SHORT CONTROL BOX WIRES TOGETHER WHILE THEY ARE CONNECTED TO THE CIRCUIT BOARD.
Aeris System Troubleshooting Sept 2013 Continued from Page 11 Condition: Driver Warning Lamp does not come on at all & Circuit board light is off Connect test light to the circuit board brown & white wires. Is test light bright? No Yes Remove white & yellow wires from circuit board. Connect test light to the circuit board light terminal and reconnect ground. Did test light flash 3 times? No Connect Test light to the brown wire and chassis ground.
Aeris System Troubleshooting Sept 2013 Condition: Driver Warning Lamp comes on but does not flash three times and does not go off Possible cause: Driver Warning Lamp has constant power Before starting this section Verify the wires are attached to control unit circuit board as shown in figure 3 on page 18 (Note: Incorrect attachment of wires may cause circuit board damage) Connect test light to the circuit board yellow & white wires. Is test light on? No Yes Remove yellow wire from circuit board.
Aeris System Troubleshooting Sept 2013 Condition: Light stays on after 3 flashes at power up (flashing or steady Driver Warning Lamp) and does not go off Possible causes: System has detected air flow or has no air supply (check air supply to trailer before continuing) Verify air supply valve on the outside of the control box is in the open position (See figure 1 on page 18) Yes No Check pressure regulator setting inside control box.
Aeris System Troubleshooting Sept 2013 Condition: Tires are not within a few PSI of each other after light goes off after power up. Possible causes: Kinked or damaged ¼ inch air line. Incorrect valve core in hose or damage hose check valve. Yes Verify air supply valve on the outside of the control box is in the open position and air filter is not plugged. Is valve open and filter clear? (See figure 1 on page 18) No Open Valve Go to tire that is low and disconnect hose from tire valve stem.
Aeris System Troubleshooting Sept 2013 Continued from Page 15 Condition: Tires are not within a few PSI of each other after light goes off after power up. Possible causes: Kinked or damaged ¼ inch air line. Incorrect valve core in hose or damage hose check valve. (From Previous Page) Low or no air flow detected with hose removed from tire valve stem. Remove RAU from hub and disconnect the ¼” air line. Is high volume of air flow detected? No ¼” air line is restricted between RAU & control box.
Aeris System Troubleshooting Sept 2013 Section 4 Normal conditions that maybe observed on power up 1. Driver Warning Lamp comes on, flashes three times and goes off a. Indicates system is working and no air flow is being detected 2. Driver Warning Lamp comes on, flashes three times but light flashes every other second (It may take several minutes for light to stop flashing if a tire is being filled) a. Indicates system is working and is adding air at high volume i.
Aeris System Troubleshooting Sept 2013 Note 1: Before replacing control box verify condition by completing Power on Test again and verify you are connecting test light to the top terminal marked “light”.
