HEATLESS DESICCANT AIR DRYER INSTRUCTION & MAINTENANCE MANUAL MODEL RH203 THROUGH RH224 1
HEATLESS DRYER SERIES INSTRUCTION AND MAINTENANCE MANUAL IMPORTANT BEFORE INSTALLING OR OPERATING THE DRYER IT IS RECOMMENDED THAT THIS MANUAL BE STUDIED AND CLEARLY UNDERSTOOD. SECTION 1. TOPIC DESCRIPTION SAFETY PRECAUTIONS 2. INSTALLATION 3. OPERATION 4. MAINTENANCE & SYSTEM CHECK 5. PREVENTIVE MAINTENANCE 6. TROUBLESHOOTING GUIDE 7. PARTS LIST 8. PURGE CHART 9.
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. NOTE MAINTENANCE OR OPERATING PROCEDURES AND TECHNIQUES THAT ARE CONSIDERED IMPORTANT ENOUGH TO EMPHASIZE.
2. 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. A.
3. Generally, locate your dryer downstream from the air receiver. The only exception would be on applications with a fluctuating demand. Then the dryer should be located upstream of the receiver to avoid air surges through the dryer’s desiccant beds. 4. Provide adequate space around the dryer for servicing. Bolt dryer skid to foundation, where possible. C. SUGGESTED PIPING ARRANGEMENT Wet air inlet is at the dryer’s bottom piping assembly.
3. OPERATION A. 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. 2. Adjust purge adjustment valve so that purge pressure gauge reads appropriate pressure (see attached purge pressure chart). 3.
Repressurization takes place in a downward direction through the bed, minimizing desiccant dusting. C. TIMER OPERATION The dryer’s control circuit board or mechanical timer controls the complete cycle. No field adjustment of any kind is required for proper operation. D. ADJUSTABLE PURGE FLOW SYSTEM RH-Series Exhaust Purge Dryers feature an adjustable purge flow system. The purge flow system consists of: 1. Purge Flow Adjustment Valve 2. Purge Flow Meter (Gauge) 3.
CAUTION TO MAINTAIN THE PROPER OUTLET DEWPOINT, THE DRYER MUST RECEIVE THE PROPER AMOUNT OF PURGE AIR. IF THERE IS EXCESSIVE BACK PRESSURE IN THE TOWER BEING REGENERATED, CHECK THE PURGE MUFFLER AND PURGE PIPING. BACK PRESSURE IS INDICATED WHEN OFF-LINE TOWER PRESSURE GAUGE READS HIGHER THAT 5 PSIG. THE PIPING AND PURGE MUFFLER MUST BE KEPT CLEAN TO MAINTAIN THE PROPER PURGE RATE. WARNING WHEN SERVICING PURGE MUFFLER AND PURGE SYSTEM, DEPRESSURIZE BEFORE DISASSEMBLY.
E. MOISTURE INDICATOR OPERATION Moisture Indicator is provided to warn operating personnel of dryer malfunction. If dryer is functioning properly, desiccant in Moisture Indicator will be blue. Should blue color fade or turn pink, discontinue dryer use and consult Troubleshooting Guide. F. 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.
5. Allowing the dryer to operate for two complete cycles ensures that the probe will not be exposed to high humidity and damaging liquid water. This is especially important when dryer has been stored or sitting idle for several months. 6. After this period, slowly open the DDS sample valve so that a small flow of air passes across the probe (approximately 2 to 3 SCFH). This valve should be open at all times when dryer is in operation. 7. Now turn the auto/manual selector switch to the “auto” position.
4. MAINTENANCE AND SYSTEM CHECK B. PREFILTERS AND AFTERFILTERS 1. Prefilters - The cartridges of the prefilters must be changed as often as required to prevent contamination of the regenerative dryer’s desiccant bed. The prefilter MUST BE DRAINED DAILY. To prolong filter cartridge life, it is recom mended that a mechanical air/moisture separator be placed immediately before the prefilter. If an automatic drain trap is used, check its operation every 48 hours. 2.
G. EXHAUST MUFFLER THE EXHAUST MUFFLER MUST BE PERIODICALLY CHECKED FOR ANY RESTRICTIVE DEBRIS. At high pressures, a clogged muffler could result in high backpressure and could result in mechanical failure or personal injury. EXHAUST MUFFLER CHANGEOUT PROCEDURE WARNING TO AVOID INJURY, DEPRESSURIZE DRYER BEFORE PERFORMING ANY SERVICE. 1. If possible, shut off supply airflow to dryer. 2. Check that one of the dryer towers is off-line at 0 PSIG and that air is purging through the muffler. 3.
5. PREVENTATIVE MAINTENANCE A. 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. Verify that pressure in purging tower is 5 PSIG or less. 6. Verify that prefilters and afterfilters differential pressure is within operating limits. C. MONTHLY 1.
6. TROUBLESHOOTING GUIDE PROBLEM Elevated Dewpoint Excessive pressure drop in dryer. Failure to shift towers from drying to regenerating service. PROBABLE CAUSE CORRECTIVE ACTION Insufficient purge rate 1. Check purge flow settings. 2. Check purge piping for obstruction. 3. Clean purge piping and muffler. Inlet air/gas pressure below design condition 1. Check pressure source. Flow rate higher than design condition 1. Check flow rate and caused for increased Demand.
PROBLEM PROBABLE CAUSE CORRECTIVE ACTION Dryer fails to pressurize Faulty purge valve 1. Check purge valve and its solenoid valve. Refer to earlier steps if no pilot air is detected. 2. Check timer sequencing. Dryer depressurizes too rapidly Purge valve does not close; dryer 1. Check purge valve and its solenoid depressurizing through purge valve. Refer to earlier steps if pilot valve. air is detected. 2. Check depressurization timer circuit.
7. PURGE FLOW CHART MODEL SCFM PURGE FLOW METER SETTING RH203 35 4.9 45 PSIG RH204 50 7.0 45 PSIG RH205 75 10.6 42 PSIG RH206 100 14.12 60 PSIG RH207 125 17.5 39 PSIG RH208 150 21.2 50 PSIG RH209 200 28.25 50 PSIG RH210 250 35.3 45 PSIG RH211 300 42.37 42 PSIG RH212 350 48.1 50 PSIG RH213 400 56.5 45 PSIG RH214 500 70.6 38 PSIG RH215 650 88.7 35 PSIG RH216 750 105.9 44 PSIG RH217 900 127.1 40 PSIG RH218 1100 155.4 40 PSIG RH219 1300 183.
120/1/60 SS 5 FU 6 L1 L2 GRD 1A 5 SS FU IL-R T IL-LT SVLT SVRT SVPL SVPR PB GRD T-PCB 2 T-PCB IL- R T 2 7 SLVT 2 8 SLRT 2 IL-LT 2 9 SVPR 2 10 SVPL 2 IL-FTS 2 7 G 5 1 4 7 10 2 5 8 11 3 6 9 12 8 START/STOP SWITCH FUSE INDICATOR LIGHT- RIGHT TANK INDICATOR TANK - LEFT TANK SOLENOID VALVE - LEFT TANK SOLENOID VALVE - RIGHT TANK SOLENOID VALVE - PURGE LEFT SOENOID VALVE - PURGE RIGHT PUSH BUTTON/RESET GROUND TIMER - PRINTED WIRING BOARD G 13 R 5 11 PB FAILURE TO SWI
LEFTTOWERPRESSURE PURGE PRESSURE LE LF ET FT TO TW OW ER ER RG I HTTOWERPRESSURE R G IO H R G IT H T TO T W W E R ER O F F O F F ON ON DR D Y R N IYG N IG DR D Y R N IYG N IG ARR5 O0W PK NE U MA A TC I SN I, C. N .O O D 8 (L A 4K 7 EZ 4 )0 38A U -9W R 1C L 0 IO L 0 H N IR ,O O 6S ID 0047 REGENERATIVEAIR DRYER M O D E L S/N VO LT AG E A M P S S C F M DESS C IANTPERT A N K INLETAIT R EMPMAX MN I INLETAR I PSIMAX MN I L A B E L NO 12.600 Arrow UNLESS OTHERWISE SPECIFIED TOLERANCES ARE: .0 +/- .
ARROW PNEUMATICS, INC. 2111 WEST 21ST STREET BROADVIEW, IL 60155 WWW.ARROWPNEUMATICS.
ARROW PNEUMATICS, INC. 2111 WEST 21ST STREET BROADVIEW, IL 60155 WWW.ARROWPNEUMATICS.
