LTV 1150 - Page 95

p/n 18603-001, Rev. C LTV
®
1200/1150 Ventilator Service Manual Page 7-17
Symptoms Possible Causes What to Do
O
2
inlet flow too low when
Low O
2
Source selected.
Verify the low pressure O
2
inlet has been
correctly calculated and set using the
Input O
2
Flow Chart.
Pulmonetic Systems recommends the use
of an O
2
monitor to verify delivered O
2
%.
Adjust the entrained O
2
flow so the
monitored value shows the desired FIO
2
.
(See the LTV
®
1200 Ventilator Operator's
Manual for information on using the Low
O
2
Source and O
2
% features.)
Rolled or leaking flow
valve inlet gasket.
Replace flow valve inlet gasket (see Flow
Valve Assembly in Chapter 8).
Flow valve output is high.
Perform the Advanced FiO
2
Diagnostic
Procedures, see page
7-27.
Failed calibration.
Recalibrate the vent. See Chapter 6 -
Maintenance & Calibration for instructions.
If the problem reoccurs after careful
recalibration, a transducer may be drifting
excessively. Replace the analog board.
See Analog Board Assembly in Chapter 8
for instructions.
Internal flexible tubing
occluded or pinched.
Internal flexible tubing has
pinhole leaks or leaking at
connections.
Open the vent and verify that none of the
flexible tubes connected to the solenoid
manifold, analog board, oxygen blender or
flow valve are pinched or leaking. See
Solenoid Manifold Assembly or Analog
Board Assembly in Chapter 8 for a routing
diagram.
Defective or leaking
solenoid manifold.
Defective solenoid.
Replace the solenoid manifold. See
Solenoid Manifold Assembly in Chapter 8
for instructions.
O
2
% is low.
Incorrect O
2
blender
solenoid output flow.
Perform the Advanced FiO
2
Diagnostic
Procedures, see page
7-27.