MSA Sirius Mode D'emploi page 66

Figure 6-5. Filter Installation
5. Install the new water filter in the filter housing recess.
6. Replace the O-ring, being sure to press gently down on top of the
water filter.
NOTE: When replacing the water filter, carefully handle the new
filter by the edges only, as it is easily torn. Install the filters
in the correct order.
• If the case oval-shaped O-ring comes out inadvertently when
changing the filters, replace it in the oval-shaped groove in the
back case before replacing the filter housing (FIGURE 6-6).
Figure 6-6. Case Oval-shaped O-ring
7. Re-install the filter housing and tighten the screw.
8. Check the system for leaks by plugging the inlet with a finger.
• A pump alarm must sound. See Chapter 3, Verifying Pump
Operation.
6-10