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Desiccant Air Dryers

AHLD E-Series

Heatless Regenerative

Models 70, 100, 150, 200, 250, 300, 350,

450, 500, 600, 750, 1000, 1250, 1500,

2000, 2500, 3000, 3500, 4500, 5000 scfm

Installation

& Operations

Model Number: Serial Number:

Dryer Type: Date of Manufacture:

Ship Date: Installation Date:

Customer Name:

Customer Address:

Customer City: State/Zip:

Accessories:

Other:

Thank you for purchasing Aircel’s AHLD E-Series Heatless Regenerative Desiccant Air Dryer with integrated Energy Management

Purge Reduction System. You are now the proud owner of one of the nest desiccant dryers on the market. Aircel AHLD E-Series

The manufacturer reserves the right to make changes without any prior notication and is not obligated in any manner.

Infomration in this manual is deemed current at the time of publication and Aircel disclaims all liability for any errors resulting in

any loss or damage.

If you have questions, need additional copies, or would like to schedule an Aircel service technician viist, contact your distributor.

Dryer Inlet Air Flow Rate:

Dryer Inlet Temperature:

Dryer Ambient Temperature:

Dryer Voltage:

Dryer MCA Minimum Circuit Ampacity:

Dryer MOP Maximum Overcurrent Protection:

Dryer Operating Pressure:

Dryer EMS Dew Point Sensor Setting (for sensor outlet dew point):

High Dew Point Setting:

Demand Cycle Setting:

Outlet Dew Point Readout on Display:

Electrical Drawing Number:

Mechanical Drawing Number:

PLC Software Program Number:

Control Air Filter Element Number:

Inlet Pre-Filter Element Number (option):

Outlet After-Filter Element Number (option):

Dryer Data Sheet 3

Safety Precautions 5

Safety Symbols 6

General Safety Instructions 7

Desiccant Safety Precautions 8

Why We Need Compressed Air Dryers 9

Purpose and Intended Use 9

Inspection on Arrival 9

Features & Options 10

Design Parameters 11

Typical Installation Diagram 13

Installation Steps 14

Start-Up and Shut Down Procedures 15

Sequence of Operation 16

Maintenance 17

Weekly Checklist 17

Semi-Annual Checklist 17

Annual Checklist 17

GENERAL SAFETY PROCEDURES:

• Improper installation, operation, or maintenance may contribute to conditions in the work area or facility that could

result in personal injury and product or property damage. Check that all equipment is properly selected and sized for

• A qualified installation and service agent must complete installation and service of this equipment.

• DO NOT weld on / to pressure vessel or modify it in any way.

• DO NOT remove, modify, or adjust protective or safety devices.

• Lock out power supply and depressurize system before performing maintenance or service work.

• DO NOT operate the equipment with the control panel door open.

IMPORTANT INFORMATION: Readers of the manual must pay extra attention to instructions and information

succeeding this symbol.

WARNING: This indicates that it is dangerous and could result in physical injury and death if the instructions are

not followed correctly.

.

TIPS & SUGGESTIONS: Following these tips can make your work easier.

EXTREME CAUTION: This indicates that there might be possible risk of material damage and personnel are

advised to exercise extra caution.

1. Certified/authorized electricians must perform electrical work.

2. Electrical work must conform to the specifications indicated by Aircel and any local or state laws that may apply.

6. Before performing any maintenance operations on the equipment, the unit must be shut down, isolated, electrical

power removed, and completely depressurized.

7. To ensure compatibility and continued trouble free operation, only genuine Aircel parts must be used.

1. Pressurize and depressurize compressed air SLOWLY! Always open air valves slowly when pressurizing the airline

system or equipment. Repair air slowly when depressurizing your air system or equipment.

2. Circuit breakers, fusable disconnect, and wiring should conform to national and/or local electrical codes. Make

certain that qualified electrical personnel perform the electrical installation for this unit.

3. Only use original fuses for the rated voltage and current.

4. Shut down the unit in the correct recommended procedure.

in accordance with the rules and regulations regarding

adsorption technology and industrial safety. There are hazards

accompanying this type of product if not operated for the

intended purpose by trained and specialized personnel.

All heated regenerative desiccant dryers are tested and

operated before shipment. However, shipping vibration may

cause damage such as loosening of certain parts. To ensure

smooth installation, it is recommended that immediately upon

receipt of the unit, the system is checked for the following:

Check the serial plate label and make sure that it is the

correct Model was ordered. Note the equipment Capacity

and Power Supply requirements and ensure that they are

in accordance with your specifications. The rated conditions

of the dryer are indicated on the serial plate label. If there

is any discrepancy, contact your representative listed on

the manual back cover.

6. Vibration during shipping can loosen the connections.

Inspect all pipe and tubing and make sure they are all

tightened and secured.

Vessel 2 (T2) purge exhaust pilot solenoid valve is

energized which supplies control air to the purge

exhaust valve (V4) which opens slowly, depressurizing

vessel 2 (T2). Simultaneously the inlet valves V1 and V2

exits to the outlet valve (V5) to the outlet particulate

filter then to custom dry process air system.

2. STEP TWO - Vessel 2 Regenerating (6 - 240 seconds):

Step 2 is a continuation of step 1 except vessel 2 (T2)

will be regenerating, vessel 2 (T2) purge exhaust valve

(V4 is still open vessel 1 (T1) is drying the inlet air. A

small portion of dry outlet air from vessel 1 (T1) (15%

average based on standard design capacity of 100 psig,

100°F inlet air, 100°F ambient air and PDP of -40°F is

taken through a small orifice in the outlet line and used

(V4) to close, this allows vessel 2 (T2) to repressurize to

line pressure, since air continues flowing through the

small outlet orifice pressurizing vessel 2 (T2). The inlet

tower selector pneumatic pilot valve maintains the inlet

valve (V1 & V2) positions.

4. STEP FOUR - Vessel 1 Extended Drying:

A few seconds before the end of repressurization

the AHLD E-SERIES Controller’s integrated Energy

Management Purge Reduction System looks at the

moisture sensor, if the moisture load is low enough,

Vessel 1 (T1) purge exhaust pilot solenoid valve is

energized which supplies control air to the purge

exhaust valve (V3) which opens slowly, depressurizing

vessel 1 (T1). Simultaneously the inlet valves V2 and

V1 shift positions with a pneumatic signal form vessel

performing and maintenance activity on the dryer.

1. The pressure differential indicator referred to as the

“Delta-P” is a very good indicator of the state of the filter

elements. Maintenance personnel must pay attention

to these to keep the drying running with full efficiency

Change filter elements on a regular basis, once a year

maximum for a 1-shift operation. Change more frequently

if operating 2 or 3 shifts such as every 6 months.

2. The useful life of a filter element depends on the quality

of air. Free open areas for input and exhaust will ensure

desiccant. Take precautions to eliminate all traces of oil

from the airflow.

5. Fluctuating dew point indicates uneven drying and

regeneration between the towers, an exhaust valve may

not be working properly or muffler may be clogged or

dirty, also vessel diffuser screen may be clogged.

1. Check all drain valves, prefilter, afterfilter and separators.

2. Check any pressure differential indicators (Delta-P) on

the pre-filter and afterfilter (filter elements should still be

Key

Down Arrow

Key

OK Key * Key

Red LED 1:

Common alarm

light

Red LED 2: Energy

Savings Active

Light

Up Arrow

ALT key

Right Arrow Key

Text Display

Simultaneously, the inlet valves V1 and V2 shift positions with

a pneumatic signal from vessel 2 (T2) purge exhaust pilot

solenoid valve to the inlet tower selector pneumatic pilot valve.

This action supplies a pneumatic signal to the inlet valves to

open valve (V1) and close valve (V2), directing the inlet air to

vessel 1 (T1) to dry the air.

The air flows up through the desiccant bed and exits outlet

valve (V5) to the outlet particulate filter. The air then moves

down the line, to the customer dry process air system.

(T2) until 240 seconds has been reached.

The timer on this step counts to 240 seconds (4-minutes).

A warning sign will flash in the upper right hand portion of the

screen and a red LED alarm light will flash on the PLC display

for any alarm. To view alarms, press the left arrow once from

the main screen.

The screen also displays the relative humidity reading and dew

point (optional).

seconds)

Vessel 2 (T2) purge exhaust pilot solenoid valve will de-energize,

dry for an extended drying period until the moisture load has

reached a set high level or an additional 30 minutes, whichever

comes first. After 30 minutes, the unit will switch and continue

normal operation until the next extended savings step.

At the start of each extended savings step, the PLC checks for

faults, EMS relative humidity sensor value, and high outlet dew

point setting (optional) to ensure if the dryer needs to continue

drying. If so, the dryer will go into extended drying.

This feature reduces the overall purge consumption, saving

energy and money.

Simultaneously, the inlet valves V2 and V1 shift positions with

a pneumatic signal from vessel 1’s (T1) purge exhaust pilot

solenoid valve to the inlet tower selector pneumatic pilot valve.

This supplies a pneumatic signal to the inlet valves to open

valve (V2) and close valve (V1), directing the inlet air to vessel

2 (T2) to begin drying the air. The air flows up through the

Vessel 1 (T1) is regenerating, Vessel 1 (T1) purge exhaust valve

(V3) is still open, Vessel 2 (T2) is drying the inlet air.

A small portion of dry outlet air from Vessel 2 (T2) (15% average

based on standard design capacity of 100 psig, 100°F ambient

air and PDP of -40°F) is taken through a small orifice in the

outlet line and used to regenerate the desiccant bed in Vessel 1

(T1) until 240 seconds has been reached.

The timer on this step counts to 240 seconds (4-minutes).

The inlet tower selector pneumatic pilot valve maintains the

inlet valve (V1 & V2) positions.

A few seconds before the end of repressurization, the

normal operation until the next extended savings step.

At the start of each extended savings step, the PLC checks for

faults, EMS relative humidity sensor value, and high outlet dew

point setting (optional) to ensure if the dryer needs to continue

drying. If so, the dryer will go into extended drying.

This feature reduces the overall purge consumption, saving

energy and money.

LEFT/RIGHT

ALARM

CONTROL

62 2 AG3101501 VA LVE,SOLENOID,3WAY,NEMA4