
NM2B
REPLACEMENT PROCEDURES (continued)
4.21.10 Remove the alarm channel mounting screws. If the machine does not
have an auxillary O
2
flow meter, skip the next two steps.
4.21.11 If the machine is equipped with an auxillary O
2
flow meter,pull the
alarm channel forward far enough to gain access to the system power
switch valve, cut the tie-wrap clamp on the flexible tube at the valve,
and remove the tube from the valve.
4.21.12 Connect the flexible tube to the system power switch valve on the
replacement alarm channel and install a new tie-wrap clamp.
4.21.13 Set the replacement alarm channel in position and connect the two
compression fittings to the system power switch valve. Do not tighten
the fittings yet.
4.21.14 Reinstall the alarm channel mounting screws.
4.21.15 Feed the flowmeter lights wire harness connector through the hole at
the top of the alarm channel.
4.21.16 Reinstall the cover plate at the top of the channel and secure it with
the hardware that was previously removed.
4.21.17 Tighten the two compression fittings at the system power switch
valve and perform the following leak test:
4.21.17.1
Open the oxygen cylinder valve and allow the pressure to
stabilize.
4.21.17.2
Close the oxygen cylinder valve.
4.21.17.3
The pressure should not drop more than 50 psi in two
minutes. (The cylinder pressure must be at least 1000
psi for this test.)
4.21.18 Connect the cables that were previously removed from J1, J2, J3 and
J4 on the alarm circuit board.
4.21.19 Replace the rear cover and its retaining screws.
4.21.20 Replace the table top and its mounting screws.
4.21.21 Connect the pipeline hoses and restore AC power to the machine.
4.21.22 Perform the PMS Procedure given in Section 6.
Rev. A
4-75
Summary of Contents for Narkomed 2B
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