Page 6-26 LTV
®
1200/1150 Ventilator Service Manual p/n 18603-001, Rev. C
• Are there any errors in the flexible tubes routing to the flow valve? This includes the
flexible tubes connecting to the bypass valve and the high and low-pressure ports
connecting to the solenoid manifold and Differential Pressure transducer.
4) Run Leak Test in VENT CHECK mode. Block the patient outlet port and the exhalation
drive port. Test should pass with values of less than 1.0 Lpm.
5) Calibrate the valve differential pressure transducer at 0 and 15 cmH
2
O.
6) Stepper Motor Calibration: Remove power from the ventilator, and connect the step
motor current calibration box with current meter. In VENT MNTCE go to Calibration:
Motor Drive. Calibrate the currents for phase A and B, per the Motor Drive Calibration
procedure (see page 6-19).
7) Warm the ventilator up by running it at the following nominal settings on a test lung for
approximately 1 hour; Volume Control, 12 bpm, 500 ml, 1.5 sec. Recheck the flow in
Vent Maintenance / Servo mode at 4000 rpm and 10 Lpm. The measured flow should
be 9.5 Lpm – 10.5 Lpm. If the measured flow is within this range, then the flow is within
specification, and there is no need to continue with this procedure; otherwise power
down the ventilator and proceed to step 8.
8) Recalibrate the flow valve as follows:
a) Using ESD safe protocol, remove the back panel. Turn on DIP switch #5.
b) Lay the ventilator flat, facing upwards. Reconnect external power and turn the
ventilator on in VENT MTNCE mode.
c) Turn the SERVO on in the VENT MTNCE menu. Push the Tidal Volume button
once and change the step position to the starting position. Use the VHOME position
labeled on the flow valve.
d) Connect a calibrated flow meter BTPD (Body Temperature Pressure Dry) to the
flow valve outlet port.
e) Determine the desired flow at 15 cmH
2
O: Record the FVt temperature reading from
the RT XDCR DATA menu. Use the table below to determine the appropriate
delivered flow based on the recorded temperature.
FVt Desired Flow (Lpm ± 0.02)
62.01 - 67.00 11.61
67.01 - 72.00 11.57
72.01 - 77.00 11.53
77.01 - 82.00 11.48
82.01 - 87.00 11.44
87.01 - 92.00 11.40
92.01 - 97.00 11.35
97.01 -102.00 11.31
102.01 - 107.00 11.27
107.01 - 112.00 11.23
f) Monitor the FVd pressure from the RT XDCR DATA menu. Adjust the turbine
speed until the FVd pressure reaches 15.00 ±.10 cmH
2
O.
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