BENDIX TCH-008-005 Manual Do Utilizador
Technical
Bulletin
Bulletin No.: PRO-08-05
Effective Date: 4/1/80 Cancels:PRO-08-05 dated 6/15/78
Page: 1 of 4
Subject:
AD-2 AIR DRYER INSTALLATION RECOMMENDATIONS
The thousands of Bendix Air Dryers operating successfully in the field today attest to the
success of this unique filtration device.
success of this unique filtration device.
A key factor in the successful operation and expected service life of the air dryer is
proper installation. Several factors are to be considered:
proper installation. Several factors are to be considered:
Operational Limitations
Because the air dryer is a regenerative type device, sufficient “purge” time must be
allowed. The dryer purge cycle is controlled by the governor and occurs when the
governor is in the “cut-out” position (compressor not compressing air).
allowed. The dryer purge cycle is controlled by the governor and occurs when the
governor is in the “cut-out” position (compressor not compressing air).
The air dryer can be used on any vehicle where normal compressor loaded time is 90
seconds or less and unloaded is 30 seconds or more. On vehicles were the compressor
remains loaded for longer periods of time, increasing the purge volume may provide for
satisfactory operation; however, in such case it is recommended that a Bendix H.V.S.G.
representative or Bendix H.V.S.G. Engineering be contacted for recommendations
before proceeding with the installation.
seconds or less and unloaded is 30 seconds or more. On vehicles were the compressor
remains loaded for longer periods of time, increasing the purge volume may provide for
satisfactory operation; however, in such case it is recommended that a Bendix H.V.S.G.
representative or Bendix H.V.S.G. Engineering be contacted for recommendations
before proceeding with the installation.
Installation Recommendations
1. The dryer should be mounted securely outside the engine compartment in an area of
air flow when the vehicle is in motion. Do not mount close to heat producing
components such as exhaust stacks or the exhaust system.
components such as exhaust stacks or the exhaust system.
2. The dryer must be mounted vertically with the purge valve exhaust towards the
ground. Connection from the governor unloader port to purge valve should be a
constantly declining line. Avoid routing the line over heat producing areas (exhaust
system, etc.).
constantly declining line. Avoid routing the line over heat producing areas (exhaust
system, etc.).
3. The air dryer is installed in the compressor discharge line, not less than six feet from
a two cylinder compressor or ten feel from a single cylinder compressor when using
copper tubing. Teflon hose or wire braid hose can be substituted for copper tubing
using a 1½’ to 1’ ratio:
copper tubing. Teflon hose or wire braid hose can be substituted for copper tubing
using a 1½’ to 1’ ratio:
Examples: 1.
Six feet of copper tubing can be replaced by nine feet of either
teflon or wire braid hose.
teflon or wire braid hose.
2. Six feet of copper tubing can be replaced by three feet of copper
tubing plus four and one-half feet of either teflon or wire braid
hose.
hose.