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Medical Gas Supply System
Figure 23 - Apply Slow Bleed from Test Point.
Item Description
1
2
3
NOTE - Item 2 Valve shown in open position.
There are number of options for applying a small bleed
from the test point.
Option 1. With the valve (item 2) open, connect a flow
meter to the test point (item 1) to apply a small leak.
Option 2. Alternatively, close the valve (item 2) and
attach an open-ended probe to the test point (item 1).
Partially open the valve (item 2) until there is a small flow
from the test point.
Option 3. Final option, close the valve (item 2) and
loosen the test point connection (item 3). Partially open
the valve (item 2) until there is a small flow from the
connection point.
3.4.12 Adjust the 2
nd
point by turning the adjustment screw (See section
4.5, Pressure Regulator Adjustment). Then turn anti-
clockwise until the line pressure reading is below the low
line pressure set point. Default set points can be seen in
table 5.
Terminal Unit
Test Point Isolation Valve
Test Point Connection
2
3
1
stage pressure regulators set
Table 5: Default Line Pressure Alarm Settings.
Nominal
Line
Low Pressure
Pressure
Alarm
4 Bar
8 Bar
11 Bar
3.4.13 The controller screen output alarm conditions
will show as per figure 24.
Figure 24 - Low Line Pressure Fault.
3.4.14 Adjust the line pressure back to nominal (see
table 6, in section 4, principles of operation for typical
line pressure settings). The controller screen and output
alarm conditions will change typically as shown in figure
16.
3.4.15 Close off the slow bleed from the terminal unit
by closing the valve (figure 23, item 2), remove flowmeter
or probe if used from the test point, reseal the test point
connection (figure 23, item 3), if required.
3.4.16 Close all bank cylinder valves.
3.5
Prime the Manifold Changeover
System.
3.5.1
Complete the steps in section 4.2 - Procedure to
prime Manifold Changeover System, to bring it online.
21
Default Values
High Pressure
Alarm
3.7
4.9
6.4
8.8
9.1
11.8
4109992485.00
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