AIR SUSPENSIONS AND HWH - HWH Corporation

Single output air compressor wiring diagram3-8.2 Multiple output air compressor. The multiple output auxiliary air compressor not only supplies airto the leveling system but can also maintain an accessory tank for room air seals or other air equipmentand/or the main coach air supply tanks. There are different ways this type of air compressor can be setup so it is important to get the correct air and wiring diagrams for a specific air compressor.The compressor represented in the following drawings is a three port compressor that is used to maintainan accessory tank and the main coach tanks. One port is for the leveling system, one is for an accessory airtank and one is for the main vehicle air tanks.The accessory tank is maintained at all times with battery power switched through a pressure switch onthe air compressor. If the pressure in the accessory tank drops to between 70 and 80 psi, the pressureswitch contacts should close and the compressor should come on. The compressor should turn off when thepressure in the accessory tank reaches 90 psi and the pressure switch contacts open.The port for the main vehicle air tanks is controlled with a normally closed solenoid valve. Thecompressor pressure switch also controls when the compressor will run. The vehicle manufacturer suppliesa dash switch to control this maintenance function. Any time the dash switch is on, the solenoid valve forthe vehicle air tanks will be on. If the vehicle tanks or the accessory tank air pressure drops below 70 to 80psi, the pressure switch contacts will close and the compressor will run. When the pressure increases to 90psi, the pressure switch contacts will open and the compressor will turn off. The solenoid valve for thevehicle air tanks will remain open as long as the dash compressor switch is on.Page 33 – 22JUL09