Dräger Narkomed 2C Technical & Service Manual page 58

REPLACEMENT PROCEDURES (continued)
4.8.15 From the back of the flowmeter housing, remove the upper and lower
alarm channel mounting screws.
4.8.16 At the front of the machine, pull the alarm channel assembly
forward, and feed the flowmeter lights wire harness through the hole
at the top of the alarm channel.
4.8.17 Disconnect the orange and orange/white wires from the oxygen supply
pressure alarm switch.
4.8.18 The following steps apply to replacement of the oxygen supply
pressure alarm switch. If the entire alarm channel assembly is being
replaced, skip the next two steps.
4.8.19 Remove the alarm switch from the assembly at point A as shown in
the illustration.
4.8.20 Install the replacement alarm switch with sealing tape on the
threads, and ensure that the switch is oriented on the assembly as
shown in the illustration.
4.8.21 Connect the orange and orange/white wires to the replacement switch
in the same manner as the original.
4.8.22 Feed the flowmeter lights wire harness through the hole at the top of
the alarm channel, and set the alarm channel assembly into place.
4.8.23 Install the upper and lower alarm channel mounting screws.
4.8.24 If applicable, reconnect the flex line from the auxiliary O
and install a new tie strap at the hose barb.
4.8.25 Reconnect the the O
fittings.
4.8.26 Reconnect the cables to J1, J2, J3 and J4 on the alarm circuit board.
4.8.27 Reinstall the front flowmeter and vapor box cover with the six screws
that were previously removed.
4.8.28 Pull the writing or keyboard tray out to its fully extended position.
4.8.29 Locate the tee fitting in the ¼ in. diameter output line of the O
regulator and remove the plug from the tee fitting.
4.8.30 Connect a dedicated O
4.8.31 Connect AC power to the machine and enable the circuit breakers by
pressing their buttons in.
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lines, and tighten the three compression
2
test gauge to the tee fitting.
2
4-28
NM2C
flowmeter
2
2
Rev. A