PHM MINI SERIES HEATLESS AIR
DRYER INSTALLATION & OPERATION
General
1. If base mounted, secure base plate to hard surface,
or hang securely on a wall.
2. Dryer should be installed indoors or under a shed.
3. Equip dryer with inlet and outlet isolation valves and
a bypass valve for ease of servicing and start-up.
4. Connect electric power to the dryer through a
properly sized fused disconnect switch.
5. Reactivation exhaust may be piped away from the
dryer, making sure proper pipe size is used. For
every ten-foot run, increase the pipe diameter by
one size to reduce back pressure.
6. ELECTRICAL CONNECTIONS: Follow the
recognized local and municipal electrical codes. All
components must be load rated as approved by
NEC, NEMA, CSA and UL.
7. During shipment, wire connections may become
loose. Per UL specification, torque screws inside
enclosure to 20 in-lbs.
8. GROUNDING: It is mandatory that the dryer be
grounded. Use an adequate ground with the
conductor sized to NEC.
9. STORAGE: In case of extended storage period
before the installation, follow these simple
procedures:
a. Seal or cover all the parts
b. Wrap the electrical enclosure
c. Wrap the mufflers
d. If the desiccant is shipped loose, store it inside
to avoid any rain or water damage.
10. LEAK TEST: All the dryers are tested at the factory
for any leaks before shipment. An air leak could
develop during transportation or installation.
Pressurize the system and check for any leaks.
Theory of Operation
The PHM Mini Series Heatless Regenerative Air Dryer
features “State of the Art” design. The 4-way inlet valve
and outlet shuttle valve make these dryers trouble-free in
operation and require very little maintenance. Standard
Heatless Regenerative Air Dryers operate on a 10
minute NEMA cycle.
• Drying: 5 minutes
• Regeneration: 4 minutes, 20 seconds (continuous
flow)
• Repressurizing: 40 seconds
While one adsorbent filled tower is drying the inlet flow at
the line pressure, in the upward direction for 5 minutes,
the other tower goes through a mode of desiccant
regeneration in counter flow for 4 minutes, 20 seconds.
Start-Up Procedure
1. Leave the dryer power supply disconnected.
2. Keeping the dryer isolation outlet valve closed,
slowly pressurize both the desiccant chambers to
the line pressure.
3. Check for any leaks in the system.
4. Purge valve should be closed at this time (N.C.
vavle)
5. Connect the dryer power supply
6. The purge valve should open and depressurize one
desiccant chamber.
7. Run the dryer through one or two cycles before
slowly opening the dryer isolation outlet valve.
Operational Observation
1. The drying chamber should be at the line pressure
indicated on the drying chamber pressure gauge.
2. The reactivation chamber should be at 0 PSIG. (Any
higher pressure is an indication of some malfunction;
refer to Troubleshooting Guide on Page 20.)
3. The standard time cycle is 10 minutes. While one
chamber is drying for 5 minutes the other chamber
goes through a mode of desiccant reactivation and
purge for about 4.3 minutes. The purge exhaust
valve then closes to allow the chamber to
repressurize to line pressure before switch-over
occurs at the end of 5 minutes.
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