Manual Tuning - Invacare Perfecto 2 Series Service Manual

SECTION 22—TIMING

Manual Tuning

NOTE: For this procedure, refer to FIGURE 22.2.
1. Turn power off ( ) and unplug the unit.
2. Remove cabinet. Refer to Removing Cabinet on page 23.
3. Plug unit in but DO NOT turn on ( ) until instructed to below.
4. Locate the timing switch on the P.C. board.
5. Insert a small common or flathead screwdriver into the adjustment screw of the timing
switch.
6. Set the timing switch initially at the number "7" position.
7. Turn unit on ( ) and wait 15 minutes for unit to stabilize.
8. If after 15 minutes of run time the concentration is below specification, change setting
to a number one position lower than the previous setting.
9. Let unit run ten minutes. If concentration is lower still, change the switch to number
two positions higher.
NOTE: You will find that the concentrator will perform better at either the higher or lower setting.
The normal adjustment range is between timing positions 3 and A.
10. Continue to change setting one step at a time (up or down) until the concentration is
the highest value achievable.
11. Once concentration has reached specification, retiming is complete.
12. Reinstall cabinet. Refer to Removing Cabinet on page 23.
Control Panel
P.C. Board
Manual Timing
Switch
™
Perfecto
2
FIGURE 22.2 Manual Tuning
76
Part No 1148070