LTV 1150 - Page 99

p/n 18603-001, Rev. C LTV
®
1200/1150 Ventilator Service Manual Page 7-21
Symptoms Possible Causes What to Do
High or low sense lines are
occluded.
High or low sense ports in
the wye are occluded.
Verify lines are not occluded or pinched
and/or clear the lines with a low flow (less
than 10 Lpm) gas source.
Condensation in sense
lines.
Defective purge solenoids.
Replace the solenoid manifold. See
Solenoid Manifold Assembly in Chapter 8
for instructions.
Defective or disconnected
flow valve.
Defective turbine.
Using the Vent Maintenance mode SERVO
test, determine if the turbine and flow valve
are working correctly by changing the
Turbine Speed, Flow, and Step Motor
Positions.
Verify all turbine and flow valve cables are
connected and all flexible tubes connected
to the analog board and solenoid manifold
are correctly and securely connected.
Perform the Advanced Vte Diagnostic
Procedures, see page 7-23.
Ventilator is on, gas is
not delivered and
turbine is running.
Defective or disconnected
solenoids.
Using the Vent Maintenance mode
SOLENOID test, determine if all solenoids
are working correctly.
Perform the Advanced Vte Diagnostic
Procedures, see page 7-23.
Defective or disconnected
turbine.
The SERVO test may be used to set the
turbine speed explicitly. (See Chapter 6 -
Maintenance & Calibration for instructions
on using the servo test.) The turbine speed
can be viewed using the RT XDCR DATA
display. (See Chapter 3 - Real-Time
Transducer Data for instructions on using
RT data.)
Verify all flow valve and turbine power
cables are connected. Verify all flexible
tubes connected to the analog board and
solenoid manifold are correctly and
securely connected.
Replace the turbine. See Flow Valve
Assembly or Turbine Manifold in Chapter 8
for instructions.
Defective motor board.
Replace the motor board. See Motor
Board Assembly in Chapter 8 for
instructions.
Ventilator is on, gas is
not delivered and
turbine is not running.
RT XDCR DATA item
TS shows speeds at or
near 0.
Defective power board.
Replace the power board. See Power
Board Assembly in Chapter 8 for
instructions.
Sense line connectors
wobble or loose.
Fitting connectors loosened
inside ventilator case.
Open the ventilator case and tighten the
nuts on the sense line and drive line
connectors. See Back Panel in Chapter 8
for instructions on opening the ventilator.