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Medical Gas Supply System
4.5.2.9 Tighten the right 2
locknut.
4.5.2.10 Close the vent valve (Item 6, Figure1).
4.5.2.11 Open left side 2
isolation valve as below position.
4.5.2.12 Verify the manifold operation. Refer to Section
3.4
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 and Section 5.2 for typical
cylinder handling safety check list) when moving the
cylinders into place ready for connection to the pigtails.
4.6.2
When the running cylinder bank pressure falls
to the changeover set point (for typical changeover
pressures see Table 8). The running cylinder bank will
automatically switch to the standby cylinder bank and
provide the following alarm outputs shown in Table 7.
Figure 27 shows typical operation status on the display:
left bank running, right bank empty.
4109992459.00
Vent
Valve
Line
Isolation
Valve
2
Stage
nd
Pressure
Regulator
Intermediate
Isolation
Valve
stage pressure regulator
nd
stage pressure regulator
nd
Vent
Valve
Line
Isolation
Valve
2
Stage
nd
Pressure
Regulator
Intermediate
Isolation Valve
NOTE - If the line pressure drops below the low pressure
alarm (see Table 3 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 7: Change Cylinder Alarm Conditions.
Alarm Output Conditions
Alarm Description
Normal
Change Cylinders
Change Cylinders Immediately
Pressure Fault
Figure 27 - Left Bank Running, Right Bank Empty.
Full
Black
1500
150
PSI
NOTE - This is providing the standby cylinders are full,
when the cylinders are replaced by filled cylinders, no
changeover happened,and the "Change Cylinders "
alarm output will become inactive.
Table 8: Typical Cylinder Bank Changeover Pressure.
Nominal Supply
Pressure
55 psi
100 psi
180 psi
4.6.3
For each empty cylinder, disconnect the pitails
from the cylinder by either undoing the hand wheel or
unscrewing the nut at the cylinder end, depending on
the cylinder connection type.
4.6.4
Replace the empty cylinder and reconnect the
pigtails.
4.6.5
Repeat steps 4.6.3 & 4.6.4 for all the empty
cylinders one at a time till all have been replaced.
32
Condition
Off
On
Off
Off
O2
1500
SCFH
51
140
44.0
66.0
150
PSI
PSI
110.0
Typical Cylinder
Changeover
150 psi
300 psi
300 psi
Low
Red
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