
REPLACEMENT PROCEDURES (continued)
NM2B
4.22
Alarm Channel and Oxygen Supply Pressure Alarm Switch
The alarm channel assembly includes the oxygen supply pressure alarm
switch, the alarm circuit board, and the system power switch. Whenever the
alarm channel is replaced, the oxygen supply pressure alarm switch must be
tested to ensure that its operating point is set correctly. Removal of the alarm
channel requires removal of the upper flowmeter and vapor box cover plate,
and removal of the flowmeter housing rear cover. The alarm channel assembly
is held in place by two screws from the back. Figure 4-22 shows a rear view of
the assembly and its connections.
4.22.1
Disconnect all pipeline hoses and set the System Power switch to ON.
4.22.2
Close all cylinder valves except the O
2
valve.
4.22.3
Set the oxygen flow to 5 liters per min.
4.22.4
Open the other gas flow control valves to drain pressure from the
system.
4.22.5
Close the O
2
cylinder valve and the O
2
flow control valve. Press the
O
2
Flush valve to drain oxygen pressure from the system.
4.22.6
Set the System Power switch to
STANDBY
, and remove AC power
from the machine.
4.22.7
Disable the circuit breakers on the power supply by pulling out each
button with a knife or sharp object.
4.22.8
Remove the six screws holding the flowmeter shield and vapor box
front coverpanel, and pull the panel forward approximately ½ inch.
4.22.9
Remove the screws holding the flowmeter housing rear cover, and
remove the cover.
4.22.10 Remove the screws holding the table top, and lift out the table top.
4.22.11 Disconnect the cables from J1, J2, J3 and J4 on the alarm circuit
board.
4.22.12 Disconnect the compression fitting on the O
2
line nearest to the
oxygen supply pressure alarm switch.
4.22.13 Disconnect the remaining two O
2
lines at the top and bottom of the
tee fitting.
4.22.14 If the machine is equipped with an auxiliary O
2
flowmeter, cut the tie
strap on its flexible line and carefully remove the flex line from the
hose barb.
Rev. A
4-76
Содержание Narkomed 2B
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