User manual BENDIX AD-IS AIR DRYER

[. . . ] ® Bendix® AD-IS® Air Dryer and Reservoir System RES GOVERNOR RESERVOIR (2) 21 PRI DELIVERY TO PRIMARY RESERVOIR DESICCANT CARTRIDGE MOUNTING HOLES - 4 PURGE VALVE PRESSURE PROTECTION VALVES (4) SAFETY VALVE 22 SEC DELIVERY TO SECONDARY RESERVOIR PURGE RESERVOIR UNL GOVERNOR UNLOADER (2) MOUNTING BOLTS (3) GOVERNOR EXH GOVERNOR EXHAUST 1 IN SUPPLY FROM COMPRESSOR HEATER / THERMOSTAT AD-IS AIR DRYER PART NUMBER STAMPED HERE ® PRESSURE PROTECTION VALVES (4) 23 AUX2 AUXILIARY DELIVERY PORTS (2) 24 AUX1 AUXILIARY DELIVERY PORTS (4) FIGURE 1 - AD-IS® AIR DRYER AND RESERVOIR SYSTEM DESCRIPTION The function of the Integrated Solution Air Dryer (AD-IS®) and Reservoir System is to provide heavy vehicles with an integrated vehicle air dryer, purge reservoir, governor and a number of the charging valve components in a module. These have been designed as an integrated air supply system. The AD-IS® air dryer and reservoir system collects and removes air system contaminants in solid, liquid and vapor form before they enter the brake system. It provides clean, dry air to the components of the brake system which increases the life of the system and reduces maintenance costs. [. . . ] Pressure Protection Valve Boot Replacement- Part Number 5005163. AD-IS® Air Dryer Replacement: Replaces the complete air dryer assembly. Includes air dryer assembly and governor. AD-IS® Air Dryer Splash Shield Replacement Kit Part Number 5006698. Purge Reservoir Drain Valve: Replaces the drain valve on the purge reservoir. · 2. Build up system pressure to governor cut-out and note that the AD-IS® air dryer and reservoir system purges with an audible burst of air, followed immediately by approximately 30 seconds of air flowing out of the purge valve. "Fan" the service brakes to reduce system air pressure to governor cut-in. Note that the system once again builds to full pressure and is followed by a purge at the AD-IS® air dryer and reservoir system exhaust. It is recommended that the total air system be tested for leakage to assure that the AD-IS® air dryer and reservoir system will not cycle excessively. See Bendix publication BW5057 "Air Brake Handbook. " · BRAKING SYSTEM PROTECTION The AD-IS® air dryer and reservoir system allows the system to maintain one brake circuit up to about 100 psi even after a pressure loss in the other brake circuit. This allows a vehicle to be moved (in an emergency), but with reduced braking capacity. Compare this to a conventional system where a loss of pressure in one service tank leaves the vehicle with a limited number of reduced braking capacity applications before the parking brakes automatically apply and stay on. · · · · ROADSIDE INSPECTION In the event of a roadside inspection the system behavior will be as follows: When the system is charged to governor cut-out, and then one reservoir drain valve is opened, initially both reservoir gauges will fall, however, the AD-IS® air dryer and reservoir system primary and secondary pressure protection valves will close at pressures above 70 psi, protecting the remaining brake circuit from further loss of pressure. · · · · TEMPORARY AIR DRYER AND RESERVOIR SYSTEM BYPASS To temporarily bypass the air dryer, the following procedure needs to be followed: Follow the Maintenance Precautions outlined elsewhere in this document. Make sure that all residual pressure has been released and the air dryer purge reservoir has been drained to 0 p. s. i. , then remove the air supply line from the compressor to the inlet port (1/IN). Remove the safety valve from the AD-IS® air dryer and reservoir system body (see Figure 1 for location). Note that a short puff of trapped air may vent from the safety valve port when the valve is being removed. Using any adapters necessary, reinstall the safety valve in one of the branches of the T-fitting. Using any adapters necessary, install the air supply line into the remaining T-fitting port. After testing the T-fitting for any air leakage, by using a soap solution after charging to system SEE THE AD-IS® AIR DRYER CATALOG PAGE (STARTING ON PAGE 08-A-24) FOR A FULL LIST OF MAINTENANCE KITS AVAILABLE. NOTE: Kits are not available for the servicing of the pressure protection valves (See Figure 5). Do not attempt to adjust or service the pressure protection valves - these are not service items. TESTING THE AD-IS® AIR DRYER AND RESERVOIR SYSTEM Before placing the vehicle in service, perform the following tests: 1. Close all reservoir drain valves. 8 GOVERNOR GASKET (SPECIAL GASKET, SEE NOTE 6) GOVERNOR (NON-ADJUSTABLE, 130 PSI CUT-OUT) SMALL O-RING CHECK VALVE BODY SPRING LARGE O-RING ADAPTER BOLTS FIGURE 7 - AD-IS® AIR DRYER AND RESERVOIR SYSTEM DELIVERY CHECK VALVE cut-out pressure (a 1" bubble in 10 seconds is acceptable), the vehicle may be returned to temporary service. Note: This is a temporary bypass of the air dryer, and full repair of the unit must be carried out at the earliest opportunity. With the air dryer and reservoir system removed from the system, contaminants will be entering the air system: reservoirs will need to be manually drained daily until the repairs are completed. [. . . ] Air dryer does not purge or exhaust air. Check to determine if air passes through discharge line. Check for kinks, bends, excessive carbon deposits, or ice blockage. Discharge line should be constantly sloping from compressor to air dryer with as few bends as possible. [. . . ]