CONNECTING THE AIR LINES

PURGE CONTROL LINE

1.Install a purge control air line having a minimum inside diameter of 3/16 inches between the Bendix® AD-9®or AD-9®IPC air dryer end cover control port and an unused unloader port on the governor. The control line must be plumbed direct to the governor and not in series with automatic drain valves, lubrication systems, etc.

2.The control line should slope downward to the end cover without forming potential water traps.

DISCHARGE LINE

General:

Refer to Appendix A, Table A for recommended discharge line lengths and sizes for various vehicle applications and vocations.

PURGE EXHAUST LINE

1.If it is necessary to direct AD-9 or AD-9 IPC air dryer discharge contaminants away from vehicle components it may be necessary to purchase a special exhaust cover for the AD-9 or AD-9 IPC air dryer (Pc. No. 5003838). A one inch (25.4 mm) I.D. hose can be clamped on the special air dryer exhaust cover.

WIRING THE HEATER/THERMOSTAT

1.Determine the vehicle’s electrical system voltage and make certain that the AD-9 or AD-9 IPC air dryer that is to be installed contains the same voltage heater. Use the AD-9 or AD-9 IPC air dryer part number to confirm the proper voltage. The AD-9 and AD-9 IPC air dryers are available with either a 12 or 24 volt heater which uses 75 watts of power.

2.A two lead, 12 inch, wire harness with attached weather resistant connector is supplied with all retrofit and replacement AD-9 and or AD-9 IPC air dryers. Connect one of the two leads of the wire harness to the engine kill or ignition switch. The remaining lead of the wire harness must be connected to a good vehicle ground (not to the air dryer or its mounting bracket). A fuse should be installed in the power carrying wire; install a 10 amp fuse for 12 volt heaters and a 5 amp fuse for a 24 volt heater.

3.Use 14 GA wire if it is necessary to lengthen the wire harness provided with the AD-9 or AD-9 IPC air dryer. Make certain all wire splices are waterproofed.

4.Tie wrap or support all electrical wire leading to the AD-9 or AD-9 IPC air dryer at 6–8 inch intervals. Note: Wires should have sufficient slack and not be completely taught.

TESTING THE BENDIX® AD-9®AND AD-9®IPC AIR DRYER

Before placing the vehicle in service, perform the following tests:

1.Close all reservoir drain cocks.

2.Build up system pressure to governor cut-out and note that the air dryer purges with an audible escape of air.

3.“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 air dryer exhaust.

4.It is recommended that the following items be tested for leakage to assure that the AD-9 or AD-9 IPC air dryer will not cycle excessively.

(A)Total air system leakage (See Bendix® Air Brake Handbook, BW5057).

(B)Compressor unloader mechanism.

(C)Governor.

(D)Drain cock and safety valve in first (supply) reservoir.

(E)All air connections leading to and from the first (supply) reservoir.

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BENDIX SD-08-2412 manual Connecting the AIR Lines