LTV 1150 - Page 277

p/n 18603-001, Rev. C LTV
®
1200/1150 Ventilator Service Manual Page 9-21
E) Turn the PPout solenoid off.
• Pressure at the exhalation drive port must
be 0.0 ± 0.1 cmH
2
O.
F) Set SERVO to OFF. Apply 15 ±
0.5 cmH
2
O to the high flow
XDCR port, and turn the Apres
solenoid on. After reading, turn
the Apres solenoid off.
• AP and FDw display must read 0 ± 0.5
cmH
2
O after activating the solenoid.
G) Apply and maintain 15 ± 0.5
cmH
2
O pressure to the low and
high flow XDCR port, turn the
Purge solenoid on for 3 sec, and
then turn it off.
• FDw display must not change by more
than 0.5 cmH
2
O before and after activating
the solenoid.
H) Apply 15 ± 0.5 cmH
2
O to both
the low and high flow XDCR
ports, and turn the ExhDiffP
solenoid on. After reading, turn
the ExhDiffP solenoid off.
• FDw display must read 0 ± 0.5 cmH
2
O
before activating the solenoid and must
equal AP ± 0.5 cmH
2
O after.
I) Apply and maintain 15 cmH
2
O
pressure to the high flow XDCR
port.
• FDw display must read 15 ± 0.5 cmH
2
O.
10) Perform a Watchdog test
75
.
A) Unit under test setup:
AC adapter
VENT MTNCE mode (using
3-finger mode
76
)
No alarms
Patient circuit attached
Test lung(s) attached
Navigate to WDOG TEST and
press Select.
• Ventilator powers down, powers up,
and successfully performs POST
• Ventilator alarms, constant audible
alarm and flashes RESET alarm
• Clear alarms
75
It is normal for a RESET alarm to occur at the conclusion of POST after performing the Watchdog test, Battery
Duration test, or any other test that which causes the ventilator to go inoperative (other than pressing and
holding the On/Standby button). Press the Silence/Reset button twice to clear the alarm.
76
Using the 3-finger technique enables a modified mode of VENT MTNCE in which testing may be performed,
but Calibration procedures and changing Configuration settings can not.