SECTION 10—CHECK VALVES
47
Perfecto
2
™
SECTION 10—CHECK VALVES
Replacing Check Valves
DANGER
To prevent electrical shock, ALWAYS disconnect concentrator from electrical outlet
before servicing.
NOTE: For this procedure, refer to FIGURE 10.1 on page 48.
1. Unplug unit.
2. Remove cabinet. Refer to Removing Cabinet on page 23.
NOTE: Replace one or both check valves when performing this procedure. The check valves are one-
way directional and can be checked by passing air through them. Air should flow in one direction
only.
3. It may be necessary to remove the compressor HEPA inlet filer. Refer to Replacing the
Compressor Inlet HEPA Filter on page 26.
4. Remove tie-wrap securing the lower ¼-inch PVC tubing to the product tank.
5. Remove the tie-wrap (not shown) securing the upper ¼-inch PVC tubing to the barb
on the sieve bed (not shown).
WARNING
The check valves are one-way directional and MUST be installed correctly. The letters
“VAC” are printed on the check valves. The check valves MUST be installed with the
“VAC” on the underside of the check valve. Low system pressures and eventual bed
contamination will result if check valves are not properly installed.
CAUTION
DO NOT put a check valve on the regulator outlet tubing. Otherwise, damage may result.
The regulator outlet tubing is identified by the flow arrow on the side of the regulator
which points to it.
6. Position the check valve assembly so “VAC” is on the underside of the check valve to
ensure proper orientation.
7. Use two tie-wraps (not shown) to secure the ¼-inch PVC tubing to the product tank
and to the barb on the sieve bed where previously removed.
NOTE: Ensure check valves are not crossed. Left barb product tank check valve goes to left barb on
sieve bed. Right barb product tank check valve to right barb on sieve bed.
8. Reinstall compressor inlet HEPA filter. Refer to Replacing the Compressor Inlet HEPA
