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Medical Gas Supply System
4.5.2.11 Open left side 2
isolation valve as below position.
4.5.2.12 Verify the manifold operation.
4.5.2.13 Install and secure front cover with the four
latches.
4.6
Procedure to Cycle Banks
(Automatic Control) & Changing
Cylinders.
4.6.1
Refer to hospitals/site policy for safe cylinder
handling (See section 4.9 for typical cylinder handling
safety check list) when moving the cylinders into place
ready for connection to the tailpipes.
4.6.2
When the running cylinder bank pressure falls
to the changeover set point (for typical changeover
pressures see table 9). The running cylinder bank will
automatically switch to the standby cylinder bank and
provide the following alarm outputs shown in table 8.
Figure 28 shows typical operation status on the display:
left bank running, right bank empty.
NOTE - If the line pressure drops below the low pressure
alarm (see table 4 for reference), solenoid valve will
change to the other side in attempt to rectify. Notification
of this fault will be sent from the alarm outputs.
Table 8: Change Cylinder Alarm Conditions.
Alarm Output Conditions
Alarm Description
Normal
Change Cylinders
Change Cylinders Immediately
Pressure Fault
4109992485.00
stage pressure regulator
nd
Vent
Valve
Line
Isolation
Valve
2
Stage
nd
Pressure
Regulator
Intermediate
Isolation Valve
Condition
Off
On
Off
Off
Figure 28 - Left Bank Running, Right Bank Empty.
Full
Black
NOTE - This is providing the standby cylinders are full. If
the standby cylinders are empty, the manifold will stay
in the standby side, and will automatically changeover
after the cylinders are replaced by filled cylinders and
the "Change Cylinders Immediately" alarm output will
become active.
Table 9: Typical Cylinder Bank Changeover Pressure.
Nominal Supply
Pressure
4 Bar
8 Bar
11 Bar
4.6.3
For each empty cylinder, disconnect the tailpipe
from the cylinder (see figure 29) by either undoing the
hand wheel or unscrewing the nut at the cylinder end,
depending on the cylinder connection type.
Figure 29 - Typical Cylinder Connection.
26
Low
Red
8
Typical Cylinder
Changeover
10 Bar
20 Bar
20 Bar
1
4
3
2
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