Related Manuals for Arrow Pneumatics BP-123 THROUGH BP-725
Summary of Contents for Arrow Pneumatics BP-123 THROUGH BP-725
- Page 1 BLOWER PURGE DESICCANT AIR DRYER INSTRUCTION & MAINTENANCE MANUAL MODEL BP-123 THROUGH BP-725 ARROW PNEUMATICS, INC. 2111 WEST 21ST STREET BROADVIEW, IL, 60155 PHONE # (847) 438-9100 FAX # (847) 438-7110...
- Page 2 BLOWER PURGE DRYER INSTRUCTION AND MAINTENANCE MANUAL IMPORTANT BEFORE INSTALLING OR OPERATING THE DRYER IT IS RECOMMENDED THAT THIS MANUAL BE STUDIED AND CLEARLY UNDERSTOOD. SECTION TOPIC DESCRIPTION SAFETY PRECAUTIONS INTRODUCTION INSTALLATION OPERATION MAINTENANCE & SYSTEM CHECK PREVENTIVE MAINTENANCE TROUBLESHOOTING GUIDE PARTS LIST ELECTRICAL SCHEMATIC FLOW DIAGRAM...
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Page 3: Safety Precautions
1. SAFETY PRECAUTIONS Warnings, Cautions, and Notes used in this manual have the following significance: WARNING MAINTENANCE OR OPERATING PROCEDURES AND TECHNIQUES THAT WILL RESULT IN PERSONAL INJURY OR LOSS OF LIFE IF NOT CAREFULLY FOLLOWED. CAUTION MAINTENANCE OR OPERATING PROCEDURES AND TECHNIQUES THAT WILL RESULT IN DAMAGE TO EQUIPMENT IF NOT CAREFULLY FOLLOWED. - Page 4 2. INTRODUCTION HOW DOES A BLOWER PURGE DRYER WORK? The Blower Purge Dryer is a twin tower drying system. It is also called an “absorbent” or “desiccant” type dryer. In operation, a regenerative dryer has one tower on-line drying the compressed air stream while the off-line tower is regenerating itself.
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Page 5: Installation
3. INSTALLATION Arrow Regenerative Air Dryers are shipped as completely assembly packages, filled with desiccant ready to install. Visually check the dryer to make certain that all air lines and electrical connections are securely fastened and were not damaged in transit. If there is evidence of damage, immediately enter a claim with the carrier, and notify your Arrow representative. - Page 6 CAUTION EXHAST PURGE AIR FROM PURGE VALVE MUST BE PIPED OUT- SIDE OF BUILDING TO OUTSIDE ATMOSPHERIC AIR. 4. To reduce backpressure in your dryer, exhaust purge air from the purge MUST BE piped outside to atmospheric air. 5. Disconnect and discard the shipping strap securing the centrifugal blower in place. SUGGESTED PIPING ARRANGEMENT Wet air inlet is at the dryer’s top 4-way plug valve.
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Page 7: Dryer Operation
4. OPERATION START-UP After all piping and electrical connections are made, proceed as follows: 1. SLOWLY pressurize the dryer. When the dryer reaches full operating pressure, check the system for air leaks. Soap test all joints and fittings. To maintain desired dewpoint, any leaks detected must be fixed, especially those on the outlet side of the dryer. -
Page 8: Timer Operation
Prior to tower switch over, a 10 minute time interval is allowed to bring both towers to full line pressure before switch over (right and left tower switch drying/regenerating functions). This is accomplished by closing both purge valves, and allowing the purge air flow to bring the off-line tower up to full line pressure. - Page 9 During dryer operation, you will note that the heater will cycle on and off during the 3 hour heating period. The heater supplies enough heat that when combined with purge airflow, it will fully regenerate (dry out) the wet desiccant bed in the off-line tower. The temperature setting is factory set at 425 deg F and should be maintained at that position WARNING DURING THE REGENERATION CYCLE THE OFF-LINE REGENERATION...
- Page 10 OPTIONAL EQUIPMENT (IF APPLICABLE) 1. Dewpoint Demand System (DDS) A. The function of DDS is to conserve energy by eliminating unnecessary dryer cycling and heater power consumption. B. The DDS works by utilizing a moisture sensitive probe to measure the water vapor content of the outlet air from the drying instantaneously to a change in the moisture content of air stream.
- Page 11 NOTE FAILURE TO SHIFT ALARM LIGHT WILL BE DE-ENERGIZED EACH TIME DRYER TIMER CYCLES TO POSITION WHERE CYLINDER IS STUCK (EITHER EXTENDED OR RETRACTED). OBSERVE DRYER OPERATION TO DETERMINE WHICH SIDE OF CONTROL CIRCUIT IS MALFUNCTIONING. 3. High Humidity Alarm (HHA) A.
- Page 12 5. MAINTENANCE AND SYSTEM CHECK WARNING TO AVOID INJURY, DEPRESSURIZE DRYER BEFORE PERFORMING ANY SERVICE. WARNING IF THE DRYER IS DE-ENERGED WHILE DRYING SERVICE AIR THROUGH THE RIGHT TOWER, IT MUST BE DEPRESSURIZED BEFORE RE- ENERGIZING THE CIRCUIT BOARD. FAILURE TO DO SO COULD CAUSE PERSONAL INJURY AND DAMAGE TO DRYER 4-WAY VALVES All 4-way valve are shipped from stock assembled and filled with proper valve sealant.
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Page 13: Solenoid Valves
NOTE VALVES SHOULD BE DISASSEMBLED, CLEANED AND RE-LUBRICATED ONCE EVERY YEAR AS PART OF A REGULAR MAINTENANCE SCHEDULE. NOTE THE EXHAUST PURGE DRYER HAS TWO 4-WAY PLUG VALVES. CHECK AND LUBRICATE EACH VALVE ON A REGULAR SCHEDULE. PREFILTERS AND AFTERFILTERS 1. - Page 14 PILOT OPERATED CYLINDER Should the air cylinder fail to extend or retract, disconnect the pilot line to check if the cylinder is receiving pilot pressure. 1. If the cylinder is receiving pressure, disassemble, clean and replace cylinder seals as required. 2.
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Page 15: Preventative Maintenance
6. PREVENTATIVE MAINTENANCE DAILY 1. Check and record inlet pressure, temperature and flow. Verify that it is within specifications. 2. Check tower pressure gauge readings within operating tolerance. 3. Check tower pressure gauges for proper dryer cycling 4. Check that there is no condense discharged from prefilters. 5. -
Page 16: Every 3 Years
ANNUALLY 1. Check desiccant and replace if necessary. 2. Inspect and clean pilot operated valves and replace packings as required. 3. Inspect and clean pilot operated valves and replace packings as required. 4. Inspect and clean solenoid valves, check valves, purge lines and lubricated plug valves. 5. -
Page 17: Troubleshooting Guide
6. TROUBLESHOOTING GUIDE PROBLEM PROBABLE CAUSE CORRECTIVE ACTION Elevated Insufficient purge rate 1. Check blower operation. Dewpoint 2. Check purge piping for obstruction. 3. Clean purge piping and muffler. Inlet air/gas pressure below 1. Check pressure source. design condition Flow rate higher than design 1. - Page 18 PROBLEM PROBABLE CAUSE CORRECTIVE ACTION Dryer fails to Faulty purge valve 1. Check purge valve and its solenoid pressurize valve. 2. Check timer micro-switch. 3. Check that Repressurization circuit is sending a control signal. Dryer Purge valve does not close; dryer 1.
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