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manual abstract
Proper tension is maintained on the V-belts by tightening the gear reducer turnbuckle support. The oil in each gear reducer must be replaced every six (6) months by 1.4 liters of I.S.O. viscosity Grade 460 gear oil. 4. Servicing the Drive System a. Removing a Drive Wheel The drive wheels are removed through the front and back panels of the dryer, not through the sides. The front loading door and back loading door panels are hinged at the top. Remove the bolts holding these panels to tumbler section frame and swing the panel out. The two (2) 1/4-inch poly-flo tubes connected to the load door piston have to be removed to allow the panel to swing up far enough out to get access to the drive wheels. Likewise, the following electrical disconnections must be performed (refer to page 32). B. MAIN AIR BLOWER/HEAT RECLAIMER SYSTEM The fan which moves the exhaust air through the dryer is a 22-inch diameter, squirrel cage fan that is driven at 1,100 rpm by a 25 HP motor. This fan moves a maximum of 13,000 cfm air through the dryer. 16 17 The dryer is equipped with a pneumatically operated heat reclaimer damper, which when opened, will recirculate approximately fifteen percent (15%) of the dryer’s exhaust air. The heat reclaimer dampener is closed until ignition of flame has been established. Then, the damper piston is actuated, opening the damper and recirculating fifteen percent (15%) of the exhaust air back over the gas burner and into the tumbler. The damper remains open for the rest of the drying cycle. On cool down, the damper closes, exhausting ALL of the 13,000 cfm which ensures a fast cool down of the load. HEAT RECLAIMER SETTINGS Z = 1-5/8 Y+Z=X Y %HR Inches Reclaimed 1-1/8" 1/2" 7.46 1-1/4" 2-5/8" 1" 15.67 2-5/8" 3-1/8" 1-1/2" 25.37 4-1/4" 3-5/8" 2" 34.32 5-3/4" 4-1/8" 2-1/2" 43.28 7-1/4" 4-5/8" 3" 50.74 8-1/2" 5-1/8" 3-1/2" 58.95 9-7/8" FULL OPEN 16-3/4" 4. TIGHTEN TOP HEAT RECLAIMER NUTS DOWN ONTO THE BOTTOM HEAT RECLAIMER NUTS. EXAMPLE: IF THE DESIRED PISTON STROKE IS TWO (2) INCHES (5.1 CM), THAN THE DISTANCE "X" IN THE ILLUSTRATION MUST BE TWO (2) INCHES (5.1 CM). 3. ADJUST THE BOTTOM HEAT RECLAIMER NUTS DOWN TO THEIR DESIRED POSITION WHICH WILL GIVE THE PROPER PISTON STROKE. 2. LOOSEN HEAT RECLAIMER ADJUSTMENT NUTS ON ALL FOUR (4) CORNERS OF THE HEAT RECLAIMER PISTON. HEAT RECLAIMER ADJUSTMENT 1. REMOVE ELECTRICITY FROM THE UNIT. NOTE: Gas Dryers must have a "Y" dimension of 1-3/16". 18 FILTER / REGULATOR The filter consists of a louver which causes a centrifugal spinning action to separate contaminants. A filter which mechanically separates contaminants is also present. The filter bowl collects the contaminants and a baffle prevents turbulence from picking up contaminants at the bottom of the bowl and returning them to the air stream. a. Filter Maintenance 1) To remove filter element ... NOTE: When replacing the filter element bowl care must be taken to ensure that the O-ring does not get pinched. C. COMPRESSED AIR SYSTEM The compressed air system of the dryer consists of a number of pneumatic pistons located throughout the dryer, an FRL (Filter/Regulator/Lubricator) assembly, and pneumatic control panel. 1. Air Pistons The pistons are actuated by solenoid and flow control valves that are under computer control. The pneumatic pistons are used to: • Tilt the dryer for loading and unloading. • Open and close load and unload doors • Operate heat reclaimer. • Operate the cool down damper and the intake air damper. 2. Filter and Regulator Assembly The purpose of the filter is to remove bulk liquids and solid particles from the compressed air stream. The filter element provides mechanical separation of solids. Centrifugal force inside the filter bowl separates bulk liquids and larger solid particles. Twist the filter bowl 1/8 turn clockwise (CW). Then pull the bowl down to expose the filter element. To remove the filter element, unscrew the baffle (this will allow element removal). 2) To clean filter element ... The filter element can be cleaned with soap and water. b. Regulator Operation The adjustment knob simply acts upon a spring rest located on the spring and directly compresses the spring as it is adjusted. A non-rising low torque adjustment screw is used on this type of filter and regulator. The upper spring rest is located on top of the regulator spring and transmits force from the adjustment screw to the spring. Regulators use simple wire coil springs for controlling the downstream regulator pressure. The bonnet houses the adjustment spring and is used to help retain the diaphragm. The diaphragm moves up when the downstream pressure reaches its preset pressure level, which in turn closes the valve. A self-relieving regulator is designed to automatically relieve overpressure in the secondary side of the regulator. NOTE: THIS SELF-RELIEVING FEATURE IS NOT DESIGNED TO BLEED THE DOWNSTREAM PRESSURE. Dryer must be provided with a clean, dry, regulated 80 PSI (+/- 10 PSI) air supply (equivalent volume - ...