Lexmark DD-220, DD-1250, DD-2500, DD-520, DD-2000 User Manual

107 W. Main Street, Worthington, PA 16262

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URL:

http://www.airtak.com

e-mail:

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INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

DELIQUESCENT DRYER

MODELS DD-48 THRU DD-5000

SPECIFICATIONS:

Maximum Working Pressure: 150 PSIG

Maximum Inlet Temperature: 110°F

SAFETY INFORMATION

DO NOT REMOVE CAP ON FILL PORT UNTIL ALL PRESSURE IS OUT OF DRYER.

DO NOT REMOVE OR ADJUST ANY EQUIPMENT ON DRYER UNTIL ALL PRESSURE IS OUT OF THE
DRYER.

DO NOT OPERATE DRYER ABOVE MAXIMUM WORKING PRESSURE.

DO NO ALTER VESSEL IN ANY WAY, SUCH AS WELDING OR GRINDING.

LOCATION

For maximum performance, always locate dryer where the inlet compressed air temperature is lowest. Inlet air
temperature to dryer must be no more than 10°F above the lowest temperature in the air system. Outlet dew point
(level of dryness) from dryer depends on inlet temperature of the compressed air.

If temperature of air from the compressor is not within this 10°F range, an aftercooler is required to reduce the air
temperature before it is processed through the dryer. An air-cooled aftercooler sized for a 10°F approach is
recommended for installation before the dryer. The aftercooler compensates for changing atmospheric
temperatures by exchanging heat between the atmospheric and compressed air so that inlet compressed air
temperature to the dryer is within the 10°F range. A separator is then required on the aftercooler outlet to remove
the condensed water.

Where air lines or equipment are located outdoors, install dryer outdoors in coolest location.

In systems where air usage fluctuates or there are sudden demands, protect dryer against air flow surges.

For best efficiency, locate dryer where air pressure is highest in system; more air can be dried at higher pressures.

INSTALLATION

1. Install dryer in an upright (vertical) position on a level surface with fill port on top. On wall-mounted models
DD-12 thru DD-48, provide strapping or additional support to prevent stress on piping to dryer.

2. Install by-pass piping with inlet, outlet and by-pass valves to isolate dryer for adding desiccant.

3. Connect inlet air piping to dryer inlet (lower connection) and outlet piping to dryer outlet (top connection).
Compressed air must flow through dryer from bottom to top of vessel or air will not be sufficiently dried.

WARNING: ALWAYS INSTALL PARTICULATE FILTER AFTER DRYER TO PREVENT ANY ACCIDENTAL
FLOW OF MATERIALS FROM DRYER INTO DOWNSTREAM EQUIPMENT.

4. Connect drain line to coupling on bottom of dryer vessel, and install manual valve at end of line. Note: Install
motorized drain (optional equipment) as indicated on instructions supplied with automatic drain.

5. Install pressure relief valve to conform to OSHA Standard 1910.169; also check local codes.

6. Remove cap from fill port on top of dryer and pour in recommended amount of Deli-Dry desiccant (see chart
below). Check to make sure that vessel is filled to within 1 or 2" of dryer top.

7. Replace cap on fill port, and tighten securely.

8. Close inlet and outlet shutoff valves; also close drain valve.

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