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Aircel AEHD Series Externally Heated
Desiccant Dryer

150 - 3,000 scfm
With its energy saving capabilities, the Aircel AEHD Series externally heated desiccant dryers combine efficiency with technology to meet the needs of your application. Heated process air regenerates the towers, requiring less purge air overall (about 7% the total rated capacity of the dryer). The standard design delivers ISO Quality Class 2 air (-40°F / -40°C) dew point to protect against freezing during low ambient conditions. For ease of installation, ultimate dryer protection, and downstream process protection, the AEHD Series comes complete with standard installed filtration package. This filtration package includes a coalescing pre-filter with automatic drain and outlet particulate after filter with manual drain.

• Heated adsorption requires less purge air than heatless dryers.
• Integrated Energy Management System maximizes your return on investment by delivering significant energy savings even during various loads and air demands.
• Up to 8 hour additional drying time with demand cycle control with no use of heater, providing maximum energy savings.
• Remote start/stop control
• Stainless steel desiccant supports and air diffusers to prevent channeling

• Countercurrent regeneration, upflow drying, and downflow depressurization
3/16" premium grade F200 activated alumina high capacity desiccant for pressure dew point performance
• Easy installation with single point connection for electrical supply power and inlet/outlet air connections
• Dry relay contact alarm for remote indication of system alarms
• 8 hour NEMA cycle
• Standard communication through RS-232/RS-485 combo port

*Scroll to the right on mobile to see entire chart
   Model
Catalog Order
Number
Capacity
Voltage
Connection
Heater kW(full load)
FLA
AEHD-150
AG9934640
150
460-3-60
1" NPT
2.5
3.7
AEHD-250
AG9934740
250
460-3-60
1½" NPT
3.75
5.2
AEHD-350
AG9934840
350
460-3-60
2" NPT
6
8.1
AEHD-500
AG9934940
500
460-3-60
2" NPT
7
9.3
AEHD-750
AG9935040
750
460-3-60
2" NPT
11
14.3
AEHD-1000
AG9935140
1,000
460-3-60
3" FLG
15
19.4
AEHD-1250
AG9904540
1,250
460-3-60
3" FLG
18
23.1
AEHD-1400
AG9904440
1,400
460-3-60
3" FLG
22
28.2
AEHD-1600
AG9904340
1,600
460-3-60
4" FLG
27
34.4
AEHD-2000
AG9935440
2,000
460-3-60
4" FLG
32.5
41.3
AEHD-2500
AG9935540
2,500
460-3-60
4" FLG
37
47
AEHD-3000
AG9935640
3,000
460-3-60
6" FLG
45
57
Capacity rated in accordance with CAGI ADF 200 @ 100 psig, 100°F inlet, 100°F ambient and a PDP of -40°F
Operating pressure: 60 to 150 psig  |  Ambient air temperature: 38°F to 125°F  |  Inlet air temperature: 40°F to 110°F
For larger capacities, higher pressures, and custom dryer options, please contact an Mdi representative

➤Click Here for AEHD Series Capacity Correction Factors

How It Works

• Compressed air flows through the pre-filter to remove oil and then enters the on-line Tower 1 through valve (A).

• Air moves upward, where the desiccant removes moisture from the air stream. The majority of clean, dry compressed air exits valve (B) and cycles through the after filter to then flow downstream.

• During the drying process, a small amount of clean air exiting valve(B) travels to Tower 2 (shown in regeneration mode) to assist in the regeneration process.

• To regenerate Tower 2, valve(C) opens and tower is depressurized to near atmospheric pressure. The air flowing from valve(B) moves down the tower, removing moisture from desiccant bed. Once it travels to the bottom of Tower 2, it exits the tower through valve(C) and the exhaust muffler to ambient.

• Once Tower 2 is fully regenerated, valve (C) will close, repressurizing Tower 2 to line pressure with the slight air flow coming through valve(B).

• Next, valve (D) will open to depressurize Tower 1 and valve (A) will switch (not pictured), directing wet incoming air to Tower 2 for drying while Tower 1 is regenerating the desiccant bed.

How Aircel AEHD Series Works
• This process will repeats continuously every 4 hours unless the Energy Management System is extending drying time period during low load conditions to a maximum of 12 hours each cycle. The Energy Management System continually monitors the mid-bed humidity level in the drying tower to save energy by extending the drying cycle (up to 12 hours).



Recommended Installation



Optional Equipment
• Various configurations of pre-piped filters and bypass valve package.
• Failure to switch alarm using pressure transducers (monitors for correct vessel pressure during dryer operation, energizes alarm if incorrect).
• Outlet dew point monitoring.
• Optional communications: Profibus-DP, AS-I, CANpen, DeviceNet, and Ethernet.
• NEMA 7 explosion-proof electrical classification (class 1, division 2, group C and D).




*Scroll to the right on mobile to see entire chart
Model
Weight (lbs)
Height (in)
Width (in)
Depth (in)
AEHD-150
1,000
77
58
36
AEHD-250
1,500
87
58
44
AEHD-350
2,000
87
62
53
AEHD-500
2,300
87
66
53
AEHD-750
2,700
89
70
53
AEHD-1000
4,100
92
80
68
AEHD-1250
4,900
97
85
68
AEHD-1400
5,200
97
85
68
AEHD-1600
7,200
99
85
73
AEHD-2000
7,800
109
94
91
AEHD-2500
9,500
109
94
94
AEHD-3000
11,500
119
113
102