MSA PremAire Manual
1/4 turn second stage regulator
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Also See for PremAire:
- Operation and instructions manual (20 pages) ,
- Instructions manual (16 pages) ,
- Manual (14 pages)
Related Manuals for MSA PremAire
Summary of Contents for MSA PremAire
- Page 1 1/4 TURN SECOND STAGE REGULATOR Combination Breathing Apparatus TAL 502 (L) Rev. 0 © MSA 2005 Prnt. Spec. 10000005389 (I) Mat. 10064383 Doc. 10064383...
- Page 2 REGULATOR COMPONENTS Item Part No. Description Item Part No. Description MASK MOUNTED REGULATOR ASSEMBLY 635343 O-Ring THREADED (with Bypass) 488797 Slide 813737 With Front Hose 635240 O-Ring 813738 With Rear Hose 488810 Screw, Guide Bypass (3) MASK MOUNTED REGULATOR ASSEMBLY 488812 Sleeve Bypass (35 - 45 in.
- Page 3 1/4 Turn Second Stage Regulator w/ Bypass 15-20 in. lbs. 35-45 in. lbs. 35-45 in. lbs. (Loctite 222) 425 Assure Adhesive TAL 502 (L) Rev. 0 - 10064383...
- Page 4 REGULATOR COMPONENTS Item Part No. Description MASK MOUNTED REGULATOR ASSEMBLY THREADED (with Bypass) 496048 With Front Hose 496049 With Rear Hose MASK MOUNTED REGULATOR ASSEMBLY QUICK DISCONNECT (with Bypass) 812858 With Front Hose 812859 With Rear Hose DUST COVERS 801130 Quick Connect 1/4 Turn 495456 Threaded...
- Page 5 TAL 502 (L) Rev. 0 - 10064383...
- Page 6 REGULATOR COMPONENTS Item Part No. Description MASK MOUNTED REGULATOR ASSEMBLY THREADED (with Bypass) 497643 With Front Hose 497644 With Rear Hose MASK MOUNTED REGULATOR ASSEMBLY QUICK DISCONNECT (with Bypass) 812860 With Front Hose 812861 With Rear Hose DUST COVERS 801130 Quick Connect 1/4 Turn 495456 Threaded...
- Page 7 TAL 502 (L) Rev. 0 - 10064383...
- Page 8 NOTES TAL 502 (L) Rev. 0 - 10064383...
- Page 9 SECOND STAGE REGULATOR DISASSEMBLY All repair procedures assume that the regulator is disas- sembled from the apparatus and facepiece. To do this: 5. Grasp the spiral retaining ring with your fingers • Be sure the cylinder valve is completely closed. and pull the spiral •...
- Page 10 SECOND STAGE REGULATOR DISASSEMBLY REMOVING THE DIAPHRAGM Do not press the lever assembly or unscrew the base Note: Use extreme care when removing the diaphragm. and lever assembly from the valve body. This could Do not bend, twist, or distort the lever assembly. Do not affect operation.
- Page 11 SECOND STAGE REGULATOR DISASSEMBLY REMOVING THE BYPASS VALVE 1. Remove the valve core. 3. Turn the handwheel 2. Unscrew the bypass sleeve from the valve and lever counter-clockwise to assembly (see valve core disassembly and repair). separate the valve and Take care not to misplace the bypass spring, bypass lever assembly from the screen, or power stage spool.
- Page 12 NOTES TAL 502 (L) Rev. 0 - 10064383...
- Page 13 SECOND STAGE REGULATOR REASSEMBLY Refer to the INTRODUCTION Tab of this Binder for General Notes and required tools. 3. Place a small screw- driver in the notch end of the spiral retaining ring. Push the notch INSTALLING A PUSH BUTTON INTO THE SHUT-OFF end into the shut-off cap groove.
- Page 14 NOTES TAL 502 (L) Rev. 0 - 10064383...
- Page 15 SECOND STAGE REASSEMBLY LUBRICATING, CLEANING, OR REPLACING THE REASSEMBLING THE RELEASE TABS RELEASE TAB 1. Before reassembly, inspect all parts for damage (wear, 1. Before starting this procedure, place a #4 rubber stop- cracking, chipping, etc.). If necessary, replace with per (P/N 060380) in the second stage regulator outlet new parts.
- Page 16 SECOND STAGE REASSEMBLY INSTALLING THE BYPASS VALVE 1. Remove the valve from the spool and discard the valve. Using the O-ring removal tool, remove the O- ring from the spool. Discard the O-ring. 7. Turn the slide until its 2. Place a new bypass valve on the end of the spool. Be grooves line up with sure the valve seats in the recess.
- Page 17 SECOND STAGE REASSEMBLY 8. Install the valve core. With the base and INSTALLING THE VALVE CORE lever assembly facing down, place a new 1. Place transparent tape over the exposed threads of bypass screen into the the valve core to protect the O-ring. power stage spool.
- Page 18 SECOND STAGE REASSEMBLY 6. Place two drops of urethane adhesive (P/N 603571) or loctite Assure #425 (P/N 602706) on the 5. Torque to 15-20 inch- exposed threads of the pounds. valve core. Do not per- mit thread sealant to contact the regulator housing.
- Page 19 SECOND STAGE REASSEMBLY INSTALLING THE STOP SPRING 1. Place the stop spring over the shut-off base hub. Push down on the spring until the bottom coil snaps into place. Do not distort or stretch the spring, or 3. Carefully thread the shut-off performance may be affected.
- Page 20 NOTES TAL 502 (L) Rev. 0 - 10064383...
- Page 21 SECOND STAGE W/BYPASS DISASSEMBLY SECOND STAGE REGULATOR REPLACING THE SECOND STAGE PRESSURE HOSE W / BYPASS AND TWO O-RINGS. 1. Be sure the air source is completely closed. 1. The hose assembly and o-rings must be replaced if 2. All repair procedures assume that the air source the hose is frayed or cracked, or shows other signs of assembly is disconnected from the manifold.
- Page 22 Air Mask. Refer to the test procedures in the instruc- tion supplied with the MSA regulator tester. 4. Reassemble the intermediate pressure hose (if discon- nected) and pressurize the system.
- Page 23 SECOND STAGE W/BYPASS REASASSEMBLY INSTALLING THE STOP SPRING Note: The cap slot locations are the six marks above the 1. Place the stop spring over the shut-off base hub. threads on the cap. Push down on the spring until the bottom coil snaps into place.
- Page 24 NOTES TAL 502 (L) Rev. 0 - 10064383...
- Page 25 SECOND STAGE W/O BYPASS DISASSEMBLY SECOND STAGE W/O BYPASS DISASSEMBLY 4. Pull the swivel shaft gently out of the regulator body. Do not disconnect an escape cylinder coupling nut if 5. Using the o-ring pressure is shown on the gauge. Always be sure to removal tool, pull the release all pressure from the system.
- Page 26 SECOND STAGE W/O BYPASS DISASSEMBLY 10. Remove and discard the external sleeve o- ring. REMOVING THE INTERNAL SLEEVE O-RING, POWER STAGE SPOOL, AND POWER STAGE DIAPHRAGM Do not press on the lever assembly. Do not unscrew the base and lever assembly or the divider skirt from the valve core.
- Page 27 SECOND STAGE W/O BYPASS REASSEMBLY INSTALLING THE SLEEVE O-RING, POWER STAGE SPOOL, AND POWER STAGE DIAPHRAGM 1. Clean any debris from inside the valve core before re- assembly. 3. Roll the o-ring in place 2. Place a new diaphragm into the valve and lever in the groove closest to assembly.
- Page 28 See Air Mask. Refer to the test procedures in the instruc- Installing a New Diaphragm or Spring. tion supplied with the MSA regulator tester. 4. Reassemble the intermediate pressure hose (if discon- nected) and pressurize the system.
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Page 29: Troubleshooting
Replace valve core damaged Power stage diaphragm orifice may Replace valve core be blocked The troubleshooting hints listed on this page applies to all configurations of the PremAire Supplied-Air Respirator System TROUBLE PROBABLE CAUSE REMEDY Regulator has low-flow performance Air-supply valve not fully open, or Be sure air source valve handwheel pressure at wrong setting. - Page 30 TROUBLESHOOTING (cont’d.) TROUBLE PROBABLE CAUSE REMEDY Air leaking from manifold Manifold port(s) not plugged Check all manifold ports to make sure they are plugged. O-ring missing from “ESCAPE Check “ESCAPE CYLINDER” port for CYLINDER” port or incorrectly leakage. Disassemble and check to installed.