• Skip to primary navigation
  • Skip to main content
  • Skip to footer

(320) 796-0851

Castair

Castair

  • Compressors
    • Industrial Series
    • Commercial / Garage
    • Contractor
    • Duplex
    • Gas Powered
    • Rotary – Piston
    • Rotary – Screw
    • Tandem
  • Major Components
    • Pumps
    • Motors
    • Tanks
    • Pressure Switches
    • Magnetic Motor Starters
    • Check Valves
    • Safety Valves
    • Gauges
    • Oil
    • Air Filters
  • Air Drying Equipment
    • Air-Cooled Aftercoolers
    • Refrigerated Compressed Air Dryers
    • Regenerative Tower Dryers
    • Filters / Regulators / Lubricators
  • Accessories
    • Automatic Drains
    • Intake Noise Silencer
    • Noise Reduction Enclosures
    • Right From Start Kits/Motor Base Belt Tentioner
    • Vib Pads / Discharge Tubes / Elbows
    • Ball Valves / Flex Lines
    • Alternator / Hour Meter Time Delay
    • Pilot Valves
    • Throttle Controls / Gas Engines / Tank Manifolds
    • Motor Pulleys / Belt Guards / Belts
    • Dual Controls
  • Guides
    • Installation Diagram
    • Air Distribution Piping
    • Formulas / Air Tool Comsumption Guide
    • Duty Cycles / Wiring
  • About
    • Contact
    • News
    • Servicing

Regenerative Tower Dryers


How Regenerative Dryers Work 

The Drying Process 

  1. Pre filtered air enters the dryer and is channeled through the desiccant tower/s. 
  2. Wet air passes through the tower/s where desiccant draws water vapor in while under pressure. 
  3. After flowing through the desiccant, the now dry air is sent downstream. 
  4. After two minutes, the control timer sends out a pilot signal shifting the internal piston. When the piston shifts, air is redirected from this tower/s to the opposite. 

The Regeneration Process 

  1. A small amount of air from the dry outlet on the opposite tower/s percolates up through the regeneration orifice and back through the desiccant filled tower/s. 
  2. The desiccant is dried as the sweep air passes back through the media. 
  3. With the use of this air, the tower/s discharge water vapor through the mufflers located below the dryer manifolds. 
  4. After 2 minutes, the control timer sends out a pilot signal shifting the internal piston. When the piston shifts flow is reversed and this tower/s begins drying the air. 

Service: Piston & Bore Lubrication

Depressurize the unit prior to any element change or service.
Each piston and bore (2) follows the same maintenance routine.

  1. Disconnect tubing from Quick-Connect Fitting located on the piston cover. Push in on brass ring. While holding ring in, pull out tubing. 
  2. Remove the four Socket Head Cap Screws holding the piston cover in place (4mm Hex Key Wrench). 
  3. Remove Piston Cover for access to piston. 
  4. Using a finger or a ½-13 bolt, remove the Piston from the Piston Bore; be sure you remove the Piston Spring. 
  5. Using the provided grease, lubricate the Piston Bore. Grease thoroughly. 
  6. Lubricate the three Piston O-rings shown above. Grease thoroughly. Note: It is unnecessary to grease the bottom Piston O-ring. 
  7. Re-install the Piston and Piston Spring. 
  8. Reattach the Piston Cover using the four Piston Socket Head Screws. Torque to 75 in lb. 
  9. Reconnect pilot line. 

Service Parts

Description  Part Number
A  Pre-filter with 5 micron element  C-FS34 
B  Replacement Pre-filter Element  C-F7 
C  Coalescing Filter with .01 micron Element  C-CF34 
D  Replacement Coalescing Element  C-F7607 
E  Tower Replacement ea. (RDD50 2 required) (RDD100 4 required) Change @ 4,000 hrs.  RDDT2 
F  Piston Rebuild Kit ea. (RDD50 2 required) (RDD100 4 required)  RDDRKS 
G  Muffler Assembly (RDD50 2 required) (RDD100 4 required)  RDDM 
H  Regenerative Desiccant Dryer Timer & Control Block – 115 volt  RDDT115 

Footer

Contact Us

8894 47th St. NE Spicer, MN 56288

Phone: (320) 796-0851
Fax: (320) 796-0854
Email: castair@tds.net
Hours: 8:00-5:00pm Monday - Friday
Dealer Catalog Dealer Login

Copyright © 2021 Castair · All Rights Reserved · All photos are owned by Castair. · Sitemap · Privacy Policy · Developed by Vivid Image · Log in