REPLACEMENT PROCEDURES (continued) NM2C
4.11.14 Hold the O
2
Flush button in and turn it until a set screw is visible
through an access hole in the guard ring. Tighten the set screw.
Rotate the button 180 degrees until the other set screw is visible, and
tighten the set screw.
4.11.15 Disconnect the absorber fresh gas hose from the fresh gas outlet.
Connect a test gauge and B.P. bulb to the fresh gas outlet, and
perform the following test:
4.11.15.1 Open the oxygen cylinder valve.
4.11.15.2 Release any pressure that is indicated on the test gauge.
4.11.15.3 Over the next 60 seconds, the test gauge should not show
a pressure increase greater than 2 cm H
2
O.
4.11.15.4 Increase the pressure to 50 cm H
2
O.
4.11.15.5 The pressure should not drop more than 10 cm H
2
Oin
the next 30 seconds.
4.11.15.6 Disconnect the test gauge from the fresh gas outlet.
4.11.15.7 Open the oxygen cylinder valve and allow the pressure to
stabilize. (The cylinder pressure must be at least 1000 psi
for this test.)
4.11.15.8 Close the oxygen cylinder valve.
4.11.15.9 The pressure should not drop more than 50 psi in two
minutes.
4.11.15.10 Connect a volumeter to the fresh gas outlet, and reset the
volumeter to zero.
4.11.15.11 Press the O
2
Flush button and observe the flow rate. It
should be between 45 and 65 liters per minute.
4.11.15.12 Disconnect the volumeter from the fresh gas outlet.
4.11.16 Connect the absorber fresh gas hose to the fresh gas outlet.
4.11.17 Replace the table top and secure it with the mounting screws.
4.11.18 Connect the pipeline hoses.
4.11.19 Perform the PMS Procedure given in Section 6.
4-38
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