LTV 1150 - Page 106

Page 7-28 LTV
®
1200/1150 Ventilator Service Manual p/n 18603-001, Rev. C
2) If the flow output is out of the acceptable output flow range, perform the following, in the
order shown.
• Check all flow valve flexible tubing for leaks or occlusions and replace any
damaged components.
• Recalibrate the flow valve transducer (see Valve Differential Calibration in
Chapter 6 for instructions).
• If flow valve recalibration is indicated, recalibrate the flow valve by adjusting the
VHOME setting (see Flow Valve Calibration in Chapter 6 for instructions).
• If flow valve replacement is indicated, see Flow Valve Assembly in Chapter 8 for
instructions.
O
2
Blender Checkout
Verify the O
2
blender Solenoid output flows, as follows:
1) Remove the O
2
blender (see O2 Blender Assembly in Chapter 8 for instructions).
2) Reconnect the 8-wire connector from the O
2
blender to the power board and the blender
O
2
tube Pisco connector to the O
2
pressure transducer on the analog board.
3) Connect a calibrated flow meter to the blender output barb fitting and a 50 psi O
2
source
to the blender O
2
inlet.
4) Set DIP switch # 5 to ON.
5) Power the ventilator On (in VENT MTNCE mode), select SOLENOID and set solenoids
# 1 through # 4 to Off.
6) Verify each (of four) solenoid’s output flow is 0.0 Lpm ± 0.5 Lpm.
• If any are not within this range, the O
2
blender is defective and is to be replaced.
7) Select each solenoid individually, set to On and record the output flow.
Solenoid Range
1 5.79 to 6.01 Lpm
2 17.45 to 18.15 Lpm
3 46.36 to 48.24 Lpm
4 46.36 to 48.24 Lpm
• If the output flows of all solenoids are within the specified range, the O
2
blender is
correctly calibrated.
• If the output flow of any one of the solenoids is not within the specified range, the O
2
blender is defective and is to be replaced.
8) Set DIP switch # 5 to Off, power the ventilator Off and reinstall or replace the O
2
blender
per instructions O2 Blender Assembly in Chapter 8.