Bendix Commercial Vehicle Systems AD-9 AND AD-9 IPC AIR DRYERS 4/11 - Manual (Page 18)

18
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 confi rm 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 retrofi t 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 suffi cient 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 fi rst
(supply) reservoir.