BIRD MARK 7 - Apneustic Flowtime Troubleshooting

~”
CALIBRATION
AND
TROUBLESHOOTING
SECTION
7:
CALIBRATION AND TROUBLESHOOTING
PROBLEM
ROD.
cartridge.
4, Malfunction in apneustic
POTENTIAL CAUSE CORRECTIVE ACTION
Cannot obtain minimum or | 1. Faulty valve or O-ring 1. Use Ye” open end wrench to
maximum APNEUSTIC (P/N 0114). remove valve. Inspect valve and
FLOWTIME. O-ring. Replace worn parts.
2. Leak in the APNEUSTIC 2. Remove pressure compartment
FLOWTIME tubing or to leak test connections at both
connections. ends of tubes 1, 2, 3, 4 and 8.
Remove ambient compartment
to leak test connections at both
ends of tubes 26, 29, 16 and
51.
3. Worn O-rings on PRESSURE/ 3. Use Ns” open end wrench to
TIME-CYCLED SELECTOR remove. Replace O-rings and
lightly lubricate with special
lubricant (P/N 0631).
4. Check operation of cartridge.
9.0 CONTROLLED EXPIRATORY TIME
9.1 Remove controlled expiratory time knob with
Ye” allen wrench.
NOTE: Units manufactured after November 1, 1978;
remove Spring (P/N 7736) and proceed to Step 9.2.
Units manufactured prior to November 1, 1978; in order
to facilitate stability in the controlled expiratory timing
valve, perform the following modification update:
m Remove packing nut from valve with Y”
open end wrench and discard.
m Install Packing Nut (P/N 0122) and O-ring
(P/N 0193) onto valve body and finger tighten
in place.
NOTE: Cam Washer (P/N 4021) and Cam Stop (P/N
4020) should remain on the valve.
9.2 Position the following controls as indicated:
m CONTROLLED EXPIRATORY TIME stem —
full clockwise.
mB INSPIRATORY FLOWRATE control — full
clockwise.
и MARK 7A PRESSURE/TIME CYCLED
SELECTOR SWITCH — “OUT”
m PRESSURE SELECTOR arm to 20.
m PRESSURE SELECTOR arm to 20.
9.3 Respirator should not cycle automatically.
Insure that the unit will remain in the “OFF”
position for a minimurn of 3 minutes. If the respi-
rator cycles during the 3-minute test period,
refer to Step 9.10, Troubleshooting, before con-
tinuing with Step 9.4.
9.4 Secure a single
cam stop at the 9:00
o'clock position. (Fig.39)
FIGURE 39
9.5 Rotate the CONTROLLED EXPIRATORY
TIME stem counterclockwise until an expiratory
time of 3.0 seconds (+.5 sec.) is obtained.
Begin timing from the moment the exhalation
valve opens until it immediately closes.
9.6 If applicable, position Spring (P/N 7736)
over valve in slotted area of packing nut.
9.7 Apply Lubewick to O-ring on retention cap
and carefully install contro! knob with index at
the 12:00 o'clock position.
NOTE: Apply sufficient pressure to control knob until
contact with valve stem has been made and secure with
92" allen wrench.
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