Bendix Commercial Vehicle Systems AD-RP PuraGuard Oil Coalescing Remote Purge Air Dryers - Manual (Page 13)

13
PURGE CONTROL LINE
1. Install a purge control air line having a minimum inside
diameter of 3/16" between the Bendix ® AD-RP ™ air
dryer 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 AD-RP
dryer 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-RP air dryer discharge
contaminates away from vehicle components, a 1”
(25.4 mm) I.D. hose can be clamped on the AD-RP
dryer exhaust.
WIRING THE HEATER/THERMOSTAT
1. Determine the vehicle's electrical system voltage and
make certain that the Bendix AD-RP air dryer that is to
be installed contains the same voltage heater. Confi rm
the proper voltage by noting the color of the heater and
thermostat connector.
The AD-RP air dryer is available with either a 12- or 24-volt
heater. Each uses 90 watts of power.
2. A separate wire harness and splice kit is with all
AD-RP air dryer replacements and retro-fi t kits. Refer
to the instructions contained in that kit for the proper
wiring procedure.
TESTING THE BENDIX AD-RP AIR DRYER
GENERAL OPERATIONAL STATEMENT
The AD-RP remote purge air dryer, operates differently
than integral purge air dryers such as the Bendix
® AD-9 ®
air dryer.
The "Remote Purge", designation is used because this air
dryer uses a small additional volume mounted on the frame
rail to purge or dry the desiccant material. During the purge
cycle, the pressure in this purge volume will drop to 0 psi.
This volume is separate from the air brake system volume,
no pressure drop in the air brake system should be caused
by the purge cycle of the AD-RP air dryer.
FIGURE 8 - BENDIX ® AD-RP ™ SYSTEM PURGE AIR DRYER
MOUNTING BRACKET BOLT LENGTHS
WIDTH (THICKNESS)
OF AD-RP ™ AIR DRYER
MOUNTING
BRACKET
MOUNTING
BOLT
1/8” BELOW
SURFACE
OF MTG.
BRACKET
VEHICLE FRAME
MEMBER
MOUNTING
BOLT
MOUNTING BOLT
1/4” ABOVE
SURFACE OF
MOUNTING
BRACKET
Heater & Thermostat Connector
Voltage Color
12 Volts White (No other markings)
24 Volts Gray, or White w/Red Dot