Section 22-Timing; Autotuning (Model Irc5Po2Aw Only) - Invacare Perfecto2IRC5PO2AW Service Manual

SECTION 22—TIMING
SECTION 22—TIMING
To prevent electrical shock, ALWAYS disconnect concentrator from electrical outlet
before servicing.
Use extreme care when making adjustments to the timing switch. DO NOT allow
screwdriver or your hands to contact the P.C. Board when unit is plugged in and/or on.
Turn unit off and unplug before adjusting timing switch. Electrical shock is possible.
To accommodate the varying tolerances when replacing components, an adjustable timer
is used to control the shift time of the pressure equalization (P.E.) valve. The SensO
allows for automatic (microprocessor controlled) adjustments of the P.E. shift times. Non-
SensO boards allow for manual adjustment.
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Autotuning (Model IRC5PO2AW Only)

DO NOT push the autotune button while powering up. Otherwise, the factory settings
will be erased.
NOTE: For this procedure, refer to FIGURE 22.1 on page 73.
1. Turn power off ( ) and unplug the unit.
2. Remove cabinet. Refer to Removing Cabinet on page 22.
3. Plug the unit in and turn the power on ( ).
4. Locate the P.C. board.
5. Wait for the main valve shift to indicate one of the following:
• If the P.C. board is new, the front panel RED indicator light will slowly blink,
indicating autotune has initiated.
• If the P.C. board is used and has performed autotuning before, press and release
the small push button on the P.C. board. The front panel RED indicator light will
slowly blink, indicating the unit is autotuning and automatically adjusting the P.E.
valve timing.
6. Set the output flow to 5.0 L/min.
7. The GREEN (onboard) diagnostic light will flash the current value of the P.E. valve
timing number.
8. Place the cover back on the unit but DO NOT install the cover screws. Let the unit run
until autotuning is completed.
9. When autotuning is complete, the RED front panel indicator light will change from a
slow blinking to a flashing of the final P.E. valve timing number.
Perfecto ™
2
DANGER
WARNING
72
board
2
Part No 1154245