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Dry Systems 127b August 10, 2006 <br /> ® AIR PRESSURE <br /> TECHNICAL DATA MAINTENANCE DEVICE <br /> MODEL D-2 <br /> 5. Determine the appropriate pressure to be maintained in the system. Refer to System Data and Technical Data for the system and <br /> components used. <br /> 6. If adjustment is necessary, refer to paragraph 9-A RESETTING. <br /> 9. MAINTENANCE <br /> The Viking Model D-2 Air Pressure Maintenance Device should be checked for correct pressure regulation after installation or repair <br /> by noting the air pressure reading within the system. If adjustment is necessary, refer to paragraph 9-A RESETTING.The filter should <br /> also be inspected and replaced or cleaned as required. <br /> A. RESETTING <br /> (Refer to Figure 2) <br /> On installation or after repair, adjustment may be necessary. <br /> 1. Turn air supply on and check downstream pressure for desired reading. <br /> 2. If adjustment of downstream pressure is necessary: <br /> a. Turn off air supply. Relieve air pressure on the system side of the AMD. <br /> b. Loosen lock nut(No. 3) <br /> c. Turn adjusting screw(No. 1)clockwise to increase pressure or counter clockwise to decrease pressure. <br /> d. Tighten lock nut. <br /> B. DISASSEMBLY <br /> WARNING: DO NOT DISCONNECT OR DISASSEMBLE THE AIR PRESSURE MAINTENANCE DEVICE WITHOUT CLOSING THE <br /> INLET AND OUTLET ISOLATION VALVES. (REFER TO FIGURE 1) <br /> CAUTION: SYSTEM AIR PRESSURE WILL BE TRAPPED BETWEEN THE OUTLET OF THE AIR PRESSURE MAINTENANCE <br /> DEVICE AND THE DOWNSTREAM CONTROL VALVE. RELIEVE PRESSURE BEFORE PROCEEDING WITH DISASSEMBLY. <br /> 1. Carefully loosen the union between the outlet of the Air Pressure Maintenance Device and the downstream control valve to relieve <br /> pressure. <br /> 2. To prevent accidental tripping of the system, manually maintain system air pressure at a constant level while the Air Maintenance <br /> Device is out of service. <br /> 3. When placing system in operation, open the INLET globe valve first! <br /> Viking 1/4' (8 mm) <br /> Air Pressure NPT Plug <br /> Maintenance <br /> Device <br /> (Included) <br /> 9-3/4"* <br /> (247,7 rnr,)) 1/4' (8 mm) <br /> Isolation <br /> Valves <br /> Normally <br /> Figure 1 open <br /> Air Maintenance Device and 1/z° (15 mm) <br /> Bypass 0 <br /> Preassembled Trim with Bypass 1/2' as mm) shut-off Va' 1/2' (15 mm) <br /> (Viking Part Number 07459 NPT InletNcloselldy NP�utlet <br /> n out <br /> (104,8 mm) 7-3/16' <br /> (182,6 r,)m) <br /> U <br /> +/- 1/4' (6,4 mm) depending on pressure setting used <br />