Appendix II
Application Information
MM-34
Page 26
Revised 11-02
Appendix II
Application Information
WARNING
To prevent serious eye injury, always wear safe
eye protection when you perform vehicle
maintenance or service.
General Requirements
NOTE:
For complete installation and operating
requirements, refer to TP-9672, Air Dryer
Application Guidelines.
O
Compressor discharge line should have a
continual downhill run to the air dryer. There
should be no water traps (low points or kinks) in
the line before or after the dryer.
O
Mount air dryer so that there is no direct splash
or spray from a wheel.
O
For maximum operating efficiency, mount
dedicated purge tank ABOVE the air dryer.
O
Keep air dryer at least 12 inches from any
heat-producing sources like exhaust manifolds
or pipes, transmissions, etc.
O
Make sure there are no valves or other devices
in the dryer-to-supply-tank line to prohibit or
restrict the flow of air back from the supply tank
to the air dryer.
O
Feed purge valve by a direct line from the air
governor.
Operating Environment
Requirements
Discharge Line:
O
Diameter from compressor to air dryer
1/2-inch i.d. minimum
O
Length from compressor to air dryer
Determined by temperature of air at the inlet
port of the air dryer. At normal vehicle
operating temperature, length must be
sufficient to keep temperature
BELOW 175°F
(80°C)
.
O
Recommendations for discharge lines:
—
21 cfm and under:
To minimize the
likelihood of a discharge line blockage
during cold climate operation, it is
recommended that for discharge lines
exceeding 9 feet in length, a minimum of
3 feet of 1/2-inch thick closed-cell
polyethylene pipe insulation be used at the
connection to the air dryer.
—
Over 21 cfm:
10 feet/20 feet — use copper
pipe or stainless steel braided teflon tubing
for minimum of first 10 feet.
Operating Parameter
Requirement
Temperature
(ambient operating
range)
–40°F to 175°F (–40°C to 80°C)
Electrical Power
(for heater and solenoid/
timer power)
12 or 24 volts available
Thermostat Range
(On/Off temp)
45°F, 86°F (7°C, 30°C)
