Invacare 6LXO2 Service Manual page 60

PROCEDURE 18
PROCEDURE 18 UNITS WITH CONTROL BOARD OR LX SMT BOARD IRC5LX/5LXO2 (FIGURE 1)
(CONTINUED)
d) Insert a small common or flathead screwdriver into the adjustment screw of the timing switch.
e) Set the timing switch initially at the number 7 position.
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2. Turn unit on.
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3. If after 10 minutes of run time the concentration is below specification, change setting to a number
M
one (1) position lower than the previous setting.
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4. Let unit run another 10 minutes. If concentration is lower still, change the switch to a number two (2)
G 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 3 and A.
5. Continue to change setting one (1) step at a time (up or down) until the concentration is the highest
value achievable. (Refer to CONCENTRATION LEVELS Chart in this PROCEDURE of the Manual.)
6. Once concentration has reached specification, retiming is complete.
7. Reinstall inlet filter.
8. Reinstall control panel. (Refer to PROCEDURE 9 - REMOVING CONTROL PANEL).
9. Reinstall cabinet. (Refer to PROCEDURE 1 - REMOVING CABINET).
TIMING IRC5LXO2/5LXO2T/6LXO2/6LXO2T - UNITS WITH INTEGRATED OR TELEMETRY
BOARDS (FIGURE 1)
To accomodate the varying tolerances when replacing components, an adjustable timer is used to control the shift
time of the pressure equlization (P. E.) valve. The integrated and telemetry boards allow for either manual or
automatic (microprocessor controlled) adjustments of the P.E. shift times.
If manual adjustments is preferred, please refer to SECTION A of this procedure.
Automatic adjustment is performed by the onboard microprocessor to optimize the oxygen output concentration.
Unattended operation is possible without the use of any additional manual adjustments.
1. Turn power OFF and unplug the unit.
2. Remove cabinet. (Refer to PROCEDURE 1 - REMOVING CABINET).
3. a. If the intergrated or telemetry board has beeen replaced, set the timing switch to position "0".
b. If the intergrated or telemetry board has NOT beeen replaced, set the timing switch to position "F".
4. Replace the cabinet. Plug concentrator in, and turn power on, set flow at 5 L/min. for the IRC5LXO2/IRC5LXO2T
and 6 L/min. for the IRC6LXO2/IRC6LXO2T.
NOTE: The flow MUST be at rated output for optimum adjustment of oxygen output for all flow ranges.
5. After the FIRST valve shift, the front panel Red LED will slowly blink. This indicates that the unit is in the auto-
tune mode. The microprocessor automatically adjusts the length of the P.E. valve timing up or down to provide
maximum value of oxygen concentration for the unit at rated flow.
6. a. If the switch is set to position "0", the auto-tune will take a minimum of three (3) hours to complete.
b. If the switch is set to position "F", the auto-tune will take a minimum of 45 minutes to complete.
7. If the front panel Red LED does NOT blink or the unit alarms immediately, check the timimg switch position.
8. When the auto-tune procedure is completed, the alarm will sound every 3-4 seconds and the front panel Red
LED will change from slowly blinking to rapid flashing. Count the number of Red LED flashes between the
pauses. This indicates the P.E. timing value the microprocessor has determined as optimum for maximum
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TIMING