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PROCEDURE 20
3. HIGH PRESSURE - Occurs when pressure in product tank rises beyond a preset value, typically
23 p.s.i. + 1 p.s.i.
A
Test in the following manner:
L
High Pressure Test (FIGURE 2).
A
3-a.
With unit running and flow set at 3 L/min. for 3LX, 5 L/min. for 5LX/5LXO2 or 6 L/min. for 6LXO2,
R
remove one (1) RED wire from the top of Pilot Valve 1. The high pressure alarm should activate
M
within 40 seconds. (Refer to FIGURE 5 for Shutdown Mode.)
T
3-b.
Set flow at 3 l/min. for 3LX, 5 L/min. for 5LX/5LXO2 or 6 L/min. for 6LXO2. Turn unit OFF and
remove one (1) RED wire from the top of Pilot Valve 1. Turn unit ON. The high pressure alarm
E
should activate within 30 seconds. (Refer to FIGURE 5 for Shutdown Mode.)
S
T
NOTE: If any alarm fails to perform to specification, contact Invacare Technical Service.
(SHOWN FOR REFERENCE)
4. OXYGEN SENSOR (5LXO2/6LXO2) - Alarm sequence occurs when concentration levels fall below
a preset value, typically 73% + 3% or 85% + 2%. This failure indicates a catastrophic failure of any
component mechanical or electrical. This test is performed in a series of STEPS.
Test in the following manner:
Oxygen Sensor Test (FIGURE 3)
Ensure that Purity Switch (SW1) is set at 73%. (Refer to PROCEDURE 17 - SENSO2 ALARM
INDICATOR AND SWITCH in this manual).
4-a.
Turn unit ON. Set output flow at 5 L/min. (5LXO2) or 6 L/min. (6LXO2).
4-b.
Monitor the O2 level.
4-c.
With the O2 level greater than 85% after 5 minutes, the GREEN panel LED will illuminate.
4-d.
Slowly adjust flow beyond maximum rated flow until you can achieve a concentration level greater
than 75% but less than 84%. Within 30 min. the YELLOW panel LED indicator will illuminate and
the unit will continue to run.
4-e.
Use care not to cut oxygen sensor tubing when clamping the oxygen sensor tubing.
Clamp off the 1/8-inch oxygen sensor tubing between the oxygen sensor and the tee in the
supply line from the product tank.
ORANGE
Wires
(DO NOT
Remove).
Pilot Valve 2
4-way Valve
FIGURE 2 - HIGH PRESSURE TEST
CAUTION
64
ALARM TEST
RED Wires
[Remove Either Wire -
STEPS 3-a and 3-b)].
Pilot Valve 1
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