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When working on air system components the following precautions should be observed.
1. Stop engine when working under a vehicle. Always block the vehicle wheels to
prevent a fore or aft roll. Bleeding off system pressure may cause the vehicle to roll.
Keep hands away from brake chamber push rods and brake adjusters; they may apply
as system pressure drops.
2. Never connect or disconnect a hose or line containing air pressure. It may whip as
air escapes. Never remove a component or a pipe plug unless you are certain all
system air pressure has been exhausted.
3. Never exceed recommended working air pressure and always wear safety glasses
when working with air pressure. Never look directly into component ports or direct a
pressurized air flow at anyone.
4. Never attempt to disassemble a component until you have read and understood all
recommended procedures. Some components contain powerful springs and injury can
result if not properly disassembled. Use only proper tools and observe all precautions
pertaining to the use of those tools.
LOCATION OF THE
PURE AIR PLUS UNIT
(ON THE VEHICLE)
1. The Pure Air Plus Air Dryer must be mounted vertically with the purge exhaust
toward the road surface. The preferred mounting location is outside the engine
compartment in an area of air flow while the vehicle is in motion.
2. Do not mount the Pure Air Plus Air Dryer near any heat producing source such
as vehicle exhaust.
3. The discharge line length for a normal installation shall be between eight (8) and
sixteen (16) feet. Note: The length of the discharge line has a direct bearing on the
performance of the Air Dryer. The longer the discharge line, the cooler the air will be
as it enters the Air Dryer which improves drying performance. Excessive line length
may result in airline freeze-up in cold weather, which could restrict or possibly prevent
air from flowing to the dryer. The maximum inlet air temperature for the Pure Air
Plus Air Dryer is 160ºF. Any temperatures above 160ºF entering the dryer will
cause diminished performance and may cause internal damage to the dryer.
WARNING
LOCATION OF THE PURE AIR PLUS UNIT
ON THE VEHICLE - (CONT'D)
4. The Pure Air Plus Air Dryer requires minimal clearance for service. Allow
a minimum of one inch above for desiccant cartridge service and two inches
below should the heater or purge valve need to be serviced.
5. It is best to install the Pure Air Plus Air Dryer below the level of the
compressor so that the discharge line from the compressor can slope down to
the Air Dryer inlet, avoiding sags or traps in the line. If possible, the Air Dryer
should be located above the level of the wet tank.
MOUNTING THE PURE AIR PLUS AIR DRYER
1. Using the template included with this installation booklet, determine
mounting bolt location.
2. Determine whether the inlet needs to face left or right.
3. Fasten the Pure Air Plus Air Dryer mounting bracket to the vehicle using
3/8 diameter bolts, grade 5 or better, and tighten to 30 ft. lbs.
4. Assemble the Pure Air Plus Air Dryer to
the mounting bracket using the 3/8 diameter
bolt and 3/8 diameter lock washer provided
and torque to 20-25 ft. lbs. Feed clamp band
through opening in mounting bracket and wrap
around dryer base to make connection. Insert
"T" bolt through the trunnion and tighten lock
nut (provided) to 50 in. lbs.
CONNECTING THE AIR LINES
1. Using appropriate fittings install line from discharge of compressor to inlet of
Pure Air Plus Air Dryer. Avoid any loops, sags, or sharp bends which may form
water traps. Discharge line must be minimum 1/2" I.D. (#10), and at least the first
four feet of line from the compressor must be metal tubing or stainless
steel-braided Teflon line.
2. Install an air line of approximately the same I.D. as the compressor discharge
line from the Pure Air Plus Air Dryer outlet to the first (supply) reservoir. This line
should also slope downward, if possible.
3. Connect a line from an unused unloader port on the governor to the 1/8 NPT
control port on the Pure Air Plus Air Dryer. This line should slope downward
avoiding potential water traps. Recommend 1/4" or 3/8" nylon tubing, or reinforced
hose with no larger than 5/16" I.D.
4. If desired, a one-inch I.D. line may be connected to the purge cover to direct
discharge away from the vehicle.
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