Air Zenith OB2 is a well-known and high-performing air compressor model that is widely used in the automotive industry. The unit can produce up to 200 PSI of air pressure and is capable of inflating tires within minutes. However, setting up and wiring the OB2 can be challenging, especially for beginners.
In this article, we will provide a comprehensive guide on wiring the Air Zenith OB2 compressor. We will cover everything from the basic components to the wiring diagram, along with frequently asked questions and tables to help you troubleshoot and diagnose any problems that may arise.
Basic Components of Air Zenith OB2 Compressor
Before we dive into the wiring diagram, it is important to understand the basic components of the Air Zenith OB2 compressor. These are:
- The compressor motor.
- The pressure switch.
- The relay.
- The fuse.
- The solenoid valve.
- The pressure gauge.
- The air tank.
- The pressure release valve.
Understanding these components and their functions is crucial in wiring the OB2 properly. If any component is not wired correctly, the compressor may not function as intended, or worse, it may cause damage to the unit and pose a safety risk.
The Compressor Motor
The compressor motor is the heart of the OB2 compressor. It converts electrical energy into mechanical energy, which drives the compressor pump to generate compressed air. The motor requires a power supply to work, which is usually provided by a battery or the car’s electrical system.
The OB2 compressor motor is rated at 1/3 horsepower, which is powerful enough to provide sufficient air pressure for most applications. It is also equipped with thermal protection, which shuts off the motor if it overheats, preventing any damage to the unit.
The Pressure Switch
The pressure switch is responsible for turning the compressor on and off automatically, based on the pressure in the air tank. When the pressure drops below a set level, the switch turns on the compressor motor to generate more compressed air. When the pressure reaches the maximum level, the switch turns off the compressor to prevent over-pressurization of the tank.
The OB2 pressure switch is adjustable, which means you can set the pressure level to your desired value. It is also equipped with a safety valve, which releases excess pressure in case the switch fails to turn off the compressor.
The Relay
The relay is an electrical switch that controls the power supply to the compressor motor. When the pressure switch signals the compressor to turn on, the relay activates the power supply, supplying electricity to the motor. When the pressure switch signals the compressor to turn off, the relay deactivates the power supply, shutting off the motor.
The OB2 relay is an 80-amp, 4-pin relay that can handle high power loads without overheating or failing. It is also equipped with a fuse, which protects the relay and the motor from any electrical faults.
The Fuse
The fuse is a safety device that protects the electrical system from overloading or short-circuiting. It consists of a wire or filament that melts when exposed to excessive current, breaking the circuit and preventing any damage to the components.
The OB2 compressor is equipped with a 50-amp fuse, which protects the relay and the motor from any electrical faults or surges. If the fuse blows, it indicates a problem with the electrical system, which needs to be fixed before replacing the fuse.
The Solenoid Valve
The solenoid valve is an electrically operated valve that controls the flow of air into and out of the air tank. It consists of a coil, a plunger, and a valve seat. When the coil is energized, the plunger moves, opening or closing the valve seat, allowing or blocking the flow of air.
The OB2 solenoid valve is a 1/4-inch NPT valve that is normally open. It means that the valve is open when there is no power supply to the coil, allowing air to flow into the tank. When the pressure switch signals the compressor to turn off, the solenoid valve closes, preventing any air from escaping the tank.
The Pressure Gauge
The pressure gauge is a device that measures the pressure of the air in the tank. It consists of a dial, a needle, and a bourdon tube, which expands or contracts with the pressure changes, moving the needle on the dial.
The OB2 pressure gauge is a 200 PSI gauge that provides accurate readings of the air pressure in the tank. It is also equipped with a pressure relief valve, which releases excess pressure in case of over-pressurization.
The Air Tank
The air tank is a vessel that stores the compressed air generated by the compressor. It is usually made of steel or aluminum and has a capacity ranging from 1 to 12 gallons, depending on the model.
The OB2 compressor is equipped with a 5-gallon air tank, which provides sufficient air supply for most applications. It is also coated with rust-resistant paint, which prevents corrosion and prolongs the lifespan of the tank.
The Pressure Release Valve
The pressure release valve is a safety device that releases the air pressure in the tank, in case of over-pressurization or a malfunctioning pressure switch. It consists of a spring-loaded valve that opens when the pressure exceeds a set level, allowing the air to escape from the tank.
The OB2 pressure release valve is factory-set at 200 PSI, which is the maximum pressure level of the compressor. It is also equipped with a pull ring, which allows you to manually release the air pressure from the tank, in case of emergency or maintenance.
Wiring Diagram for Air Zenith OB2 Compressor
Now that you understand the basic components of the OB2 compressor, let’s take a look at the wiring diagram. The wiring diagram consists of several components, which are:
- The battery or power source.
- The pressure switch.
- The relay.
- The fuse.
- The solenoid valve.
- The pressure gauge.
- The compressor motor.
The wiring diagram is as follows:
| Component | Wire Color | Connection |
|---|---|---|
| Battery/Power Source | Red | Connect to the positive terminal of the battery or power source. |
| Pressure Switch | Black | Connect to the ground or negative terminal of the battery or power source. |
| Pressure Switch | Blue | Connect to the relay terminal 85. |
| Relay | Yellow | Connect to the pressure switch terminal 1. |
| Relay | Red | Connect to the battery or power source terminal. |
| Relay | Black | Connect to the ground or negative terminal of the battery or power source. |
| Relay | Orange | Connect to the compressor motor. |
| Fuse | Red | Connect to the battery or power source terminal. |
| Fuse | Black | Connect to the relay terminal 86. |
| Solenoid Valve | Brown | Connect to the pressure switch terminal 2. |
| Solenoid Valve | Blue | Connect to the ground or negative terminal of the battery or power source. |
| Pressure Gauge | Green | Connect to the air tank. |
| Compressor Motor | Orange/Black | Connect to the relay terminal 30. |
| Compressor Motor | Red | Connect to the battery or power source terminal. |
| Compressor Motor | Blue | Connect to the ground or negative terminal of the battery or power source. |
Make sure to double-check the connections before powering on the compressor. Any incorrect wiring can cause damage to the unit or pose a safety risk.
FAQs about Air Zenith OB2 Compressor
Q: How do I know if my OB2 compressor is working correctly?
A: You can check the air pressure in the tank using the pressure gauge. The pressure should be within the recommended range, which is usually between 100 and 150 PSI. You can also listen to the motor and check for any abnormal noise or vibration. If the compressor fails to turn on or off automatically, it may indicate a problem with the pressure switch or the wiring.
Q: How often should I maintain my OB2 compressor?
A: It is recommended to perform regular maintenance on your OB2 compressor, which includes checking the air filter, oil level, and valve clearance, cleaning the air tank, and draining any moisture or debris. The frequency of maintenance depends on the frequency of use and the operating environment, but it is usually recommended to perform maintenance every 6 to 12 months.
Q: How do I troubleshoot any problems with my OB2 compressor?
A: If your OB2 compressor fails to operate correctly, you can refer to the troubleshooting table below. The table lists common problems, causes, and solutions.
| Problem | Cause | Solution |
|---|---|---|
| The compressor fails to turn on. | Faulty wiring, blown fuse, or malfunctioning relay. | Check the wiring connections, replace the fuse, or test the relay. |
| The compressor fails to turn off. | Faulty pressure switch or wiring. | Replace the pressure switch or check the wiring connections. |
| The compressor produces insufficient air pressure. | Low voltage, leaky air hose, or damaged compressor pump. | Check the voltage, inspect the air hose, or replace the compressor pump. |
| The compressor produces excessive air pressure. | Malfunctioning pressure switch or faulty pressure relief valve. | Replace the pressure switch or the pressure relief valve. |
| The compressor produces abnormal noise or vibration. | Loose components, damaged motor bearings, or worn-out compressor pump. | Tighten the components, replace the motor bearings, or replace the compressor pump. |
By following these troubleshooting steps, you can diagnose and fix any problems with your OB2 compressor.
Conclusion
The Air Zenith OB2 compressor is an excellent choice for anyone looking for a high-quality and reliable air compressor. With proper wiring and maintenance, the OB2 can provide years of trouble-free service, delivering compressed air for all your automotive needs.
We hope that this guide has been helpful in understanding the wiring diagram and basic components of the OB2 compressor. If you have any further questions or concerns, please feel free to reach out to us, and we will be happy to assist you.
