64
3. HIGH PRESSURE - Occurs when pressure in product tank rises beyond a preset value, typically
23 p.s.i. + 1 p.s.i.
Test in the following manner:
High Pressure Test (FIGURE 2).
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,
remove one (1) RED wire from the top of Pilot Valve 1. The high pressure alarm should activate
within 40 seconds. (Refer to FIGURE 5 for Shutdown Mode.)
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
should activate within 30 seconds. (Refer to FIGURE 5 for Shutdown Mode.)
NOTE: If any alarm fails to perform to specification, contact Invacare Technical Service.
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.
RED Wires
[Remove Either Wire -
STEPS 3-a and 3-b)].
CAUTION
Use care not to cut oxygen sensor tubing when clamping the oxygen sensor tubing.
4-e.
Clamp off the 1/8-inch oxygen sensor tubing between the oxygen sensor and the tee in the
supply line from the product tank.
A
L
A
R
M
T
E
S
T
PROCEDURE 20
ALARM TEST
Pilot Valve 1
4-way Valve
(SHOWN FOR REFERENCE)
FIGURE 2 - HIGH PRESSURE TEST
Pilot Valve 2
ORANGE
Wires
(DO NOT
Remove).
Summary of Contents for 3LX
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