Vyaire VELA, Service Manual

Page: 41 / 111

5-4
Chapter 5: One-Year P.M. Procedure
33373-001 Version A
5.4.4 Replacing the fan filter
There will be two fan filters in the PM kit. Determine which filter you will need, the small or large
filter. Carefully, remove the fan filter retaining grid, using a flat tip screwdriver. Pinch & pull out the
foam filter (Small filter P/N 33801, Large filter P/N 34058) (see Figure 5-1).
To install a new filter, carefully place the new filter in the fan housing and place the retaining grid
back onto the fan housing. Check to make sure there are no creases or folds in the foam filter as
this will reduce its efficiency and could allow contaminants into the ventilator body. Push the
retaining grid until all four “tabs” click into place.
Figure 5-1.
Pinch
and Remove Foam Fan Filter
5.4.5 Replacing the filter, retaining washer, o-ring & check valve on the low pres O2
fitting
Using a ¾ inch open-end wrench, loosen and remove the low-pressure oxygen fitting from the back
panel as shown in Figure 5-2.
Figure 5-2. Unscrew the Low Pressure O2 Fitting
Remove the white cone filter P/N 06804 and dislodge & remove the white delrin retaining step
washer P/N 03897 (use needle nose pliers if needed).
Using needle nose pliers, pull the black duck billed check valve P/N 03895 out. Discard the filter,
washer and check valve.
Figure 5-3. White Delrin Retaining Step Washer and Duck Billed Check Valve