12 Air Dryers—A-4400 Series Technical Bulletin
Servicing Procedures
The A-4400 Series Refrigerated Air Dryer is equipped with an automatic
condensate drain trap assembly with a particle filter. The particle filter
should be replaced annually or whenever the filter element appears dirty.
To replace the particle filter element and/or automatic drain valve, refer to
Figure 6 and proceed as follows:
1. Remove the service bypass valve locking pin and push the plunger to
the right into the bypass position. Doing so will unload the pressure
in the drain bowl.
2. Turn the filter bowl counterclockwise and remove. Also remove
the O-ring .
3. Visually inspect the filter bowl for signs of cracking. If the bowl is
cracked, it is necessary to replace the complete assembly
(See Table 3, Item E ordered separately). If the bowl is not cracked,
clean it using a liquid household detergent.
4. Turn the baffle counterclockwise and remove.
5. Remove the old particle filter element and discard.
6. Install the new particle filter element (See Table 3, Item E ordered
separately). Screw the baffle into the filter body until contact is
made with the filter element , then tighten an additional 1/4 turn.
7. To replace the auto drain (See Table 3, Item E ordered separately),
remove the drain retaining nut , invert the bowl, and remove and
discard the float and seal .
8. Install the new seal and float and tighten the drain retaining
nut to approximately 25 in
.
lb of torque.
9. Reinstall the filter bowl and O-ring . Return the service bypass
valve to normal operation by pushing the plunger left to its original
position. Reinstall the locking pin to ensure that the plunger remains
positioned for normal operation.
Particle Filter
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