HP Series Heated Regenerative Dryers 150 through 5000 SCFM
- Rated Flow (SCFM) : 1750
- Avg. Purge Flow scfm m3/hr : 140
- Dimensions (in.) Height x Width x Depth : 104x90x64
- Heater (kW) : 30
- In/Out Conn.(FLG) : 3
- Desic. Weight per Tower (lbs.) : 1363
* For total desiccant weight, multiply by two. Desiccant is installed on HP 150 through 500 and shipped separately on larger units.
Due to our policy of continuous improvement, dimensions and specifications may change without notice. Request certified drawing for pre-piping. Contact ACS for larger or special models.
RATED FLOWS BASED ON 100 PSIG, 100F INLET AND 100% RH. CONSULT ACS FOR OTHER CONDITIONS.
Main Features
Ideal for general manufacturing and process industry applications, HP Series externally heated regenerative compressed air dryers provide a low -40F/C pressure dew point for superior air line moisture protection, while offering the efficiency of convection-heated desiccant regeneration.
All Van Air HP Series dryers feature...
Isolated External Heater
- Provides an extra measure of safety. Easy to service with the heating element outside of the vessels. No overhead clearance required. Distribution of heat throughout the desiccant bed optimizes dryer performance and prolongs desiccant life.
Interlock Logic Valve Control
- Patented valve control for the most reliable tower cycling. Each phase of the drying cycle must be completed before the next can begin. Protects against loss of flow or pressure because the offstream tower is always fully repressurized before air flow is redirected to it and a tower can only depressurize after the inlet transfer valve is fully seated.
Heatless Back-Up Mode
- Switch to this mode and keep the dryer on stream while the heater is being serviced. Prevents loss of production in the event of heater failure or maintenance.
Call Us for Larger or Engineered-to- Order Models for Your Application
Operation
Wet compressed air enters the inlet valve at the bottom of the unit and is dried as it flows upward through a bed of adsorbent desiccant. Dry air exits the outlet valve at the top of the dryer. A small portion of the outlet air is redirected through the external heater and downward through the offstream tower to regenerate the desiccant. Wet air is exhausted through the purge valve. The eight hour NEMA cycle includes four hours of drying, three hours of heating and one hour of cooling per tower.
Standard Equipment
- On/off switch
- Power on light
- Heater on light
- Activated alumina desiccant
- Desiccant fill/drain ports
- Stainless steel desiccant screens
- Rigid copper pilot air lines
- Control air filter
- Aluminum jacketed heater and heated zone tower insulation
- 460V/3PH/60HZ supply power
- 115V control circuit
- Single external heater
- Heatless back-up mode
- Permanently lubricated inlet transfer valve w/position indicator and depressurization safety
- Purge flow control valve w/pressure gauge for flow indication
- Purge exhaust mufflers
- Mechanical timer (heated) and solid state board (heatless) backup modes
- NEMA 1 control enclosure
- Main power and control power fuses
- Adjustable heater thermostats
- -40F/C pressure dew point
- Interlock Logic valve control
- Tower mounted tower pressure and temperature gauges
- Controlled repressurization
- ASME code pressure vessels
- Enamel exterior finish
- Tower lifting lugs
Optional Equipment
- NEMA 4 control enclosure
- Color change moisture indicator
- Mounted filters and bypass piping
- Audible alarm
- Full flow safety relief valves
- Digital dew point readout
- Dew point demand switching*
- Energy saver*
- Failure to switch/purge/pressurize
- High dew point indicator
- * Energy saver or dew point demand switching is recommended to minimize temperature spikes at tower switchover.
Dew Point Demand Switching
Holds the drying tower on stream until the desiccant bed is fully saturated. At this point, the moisture sensor signals the dryer controls to switch the process flow to the dry tower and regenerate the wet tower. Includes indicator light for in-tower high dew point with dry contacts for remote indication.
Energy Saver
Reduces the heating cycle to match actual moisture loading conditions under low flow or low inlet moisture loading conditions, thus lowering operating costs. A thermostat registers a rise in purge air outlet temperature, which indicates the bed is regenerated, so the heater is turned off.
Failure to Switch/Purge/Pressurize
Pressure switches sense offstream tower pressure. Failure to switch is indicated when the inlet valve does not shift or when a tower does not repressurize.
High Dew Point Indicator
Light is activated when the outlet dew point is higher than the set point. Includes contacts for alarm or remote indicator.
Filtration Recommendations
Regenerative dryers must have clean, oil-free inlet air!
Lubricated compressors
Dryer must be equipped with coalescing prefilters as shown in our filter brochure. Failure to do so may result in hazardous operating conditions and will void warranty. A high-temperature afterfilter is recommended to remove desiccant particles.
Non-lubricated compressors
A coalescing or particulate prefilter is recommended to keep pipe scale and dust from entering the dryer. A high-temperature afterfilter is recommended to remove desiccant particles.