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
