PHM MINI SERIES HEATLESS AIR
DRYER MAINTENANCE
WARNING
Disconnect power and depressurize the dryer
completely before starting maintenance procedures.
General
Clean the exhaust mufflers. Replace mufflers if there is
any back pressure on the tower in the regeneration
cycle.
No lubrication is required, or should be used on any of
the components.
Daily
1. Check auto drain on prefilter every shift.
2. Follow the start-up procedure.
Weekly
1. Check the shifting, purge and repressurization
operation.
2. Check the operating conditions; inlet pressure, inlet
temperature and the flow rate.
3. Check the moisture indicator. ORANGE color
indicates DRY conditions. If the color is
TRANSLUCENT, refer to the Troubleshooting Guide
on Page 20 for probable cause. (Optional
equipment.)
4. Check the purge mufflers for blockage. Possible
indication is back pressure on tower under
regeneration. Replace if necessary.
5. Check the pressure drop across prefilter and
afterfilter. Replace the elements if the pressure drop
exceeds 7 PSID.
Three Months
1. Check the prefilter and afterfilter elements for
excessive clogging or possible damage. Replace as
necessary.
2. Check outlet dewpoint conditions.
Twelve Months
1. Close the inlet and outlet valves on the dryer or
bypass the dryer and completely depressurize the
dryer system. Open the desiccant fill port and check
visually. If desiccant is contaminated with oil or
broken, replace the desiccant.
2. Inspect and clean the 4-way switching valve, purge
solenoid valve and shuttle valve. Repair or replace
as necessary.
Mufflers
Purge mufflers are installed to reduce the noise level.
The mufflers tend to plug up and increase back pressure
over time due to oil carryover and contaminants from
compressor, or due to desiccant dust at the initial start-
up. To eliminate back pressure, replace muffler after one
month of operation, and/or when the back pressure
increases to 5 PSIG in the regenerating tower.
Desiccant Replacement Procedure
Activated Alumina Grade A 1/8” diameter is used for all
standard PHM Mini Series Heatless Regenerative Air
Dryers.
Filling Procedures:
1. Make sure the dryer is depressurized.
2. Remove the upper and lower interconnecting pipe
and valves.
3. Remove the desiccant retaining screens on both
ends of the desiccant chambers. Remove all
desiccant.
4. Using a flash light, inspect the inside of each vessel
to be sure they are empty.
5. Install the bottom desiccant screens and make sure
they are secured tightly.
6. Begin filling the towers.
7. Install the top desiccant screens, and all of the
interconnecting pipe and valves.
8. Refer to the star-up procedure listed in the manual.
Desiccant Disposal
Desiccant is not considered a hazardous waste, unless
contaminated with oil or other toxic substances. Disposal
of the desiccant should be handled by a local waste
management company.
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