Datex-Ohmeda Anesthesia Delivery Unit S/5, Technical Reference Manual

Page: 296 / 494

Troubleshooting A-FGC1
B-70
Document No. 8502854
N
2
O delivery test
Perce
ntage
of
test
Which valves are operated What is being
tested How test is done Suggested actions if test fails
0 - 10 O
2
test valve is opened. The N
2
O
proportional valve is energized. The
N
2
O needle valve has to be manually
opened to over 6 l/min.
The N
2
O needle valve
and the N
2
O
proportional valve.
Looks for a flow of greater than 6 l/min.
through the sidegas flow transducer. If it can
not deliver enough flow, it remains in this
test.
Check O
2
and N
2
O pipeline pressure is
within specification.
O
2
test valve faulty.
11 - 40 The 02 test valve and the N
2
O
needle valve remain open. The N
2
O
proportional valve is closed.
This test verifies that
the N
2
O proportional
valve can shut off the
flow of N
2
O.
The sidegas flow transducer should indicate
a flow less than 60ml/min. If the test fails,
35% is stored in the system check error
history.
Check flows with a Test device.
Check flows and N
2
O proportional valve
on diagnostic page.
2. Calibrate the A-FGC1.
41-50 The 02 test valve and the N
2
O
needle valve remain open. The N
2
O
proportional valve is reopened.
This test verifies that
the N
2
O proportional
valve has reopened.
The sidegas flow transducer should indicate
a flow of at least 5 l/min. If the test fails,
48% is stored in the system check error
history.
Check the O
2
and side gas flows with a
Test device.
Calibrate the A-FGC1.
51-
100
The 02 test valve, the N
2
O
proportional valve and the N
2
O
needle valve remain open. The N
2
O/
Air selection solenoid is placed in
the Air position.
This test verifies that
selecting Air can shut
off the N
2
O flow.
The microprocessor in the Fresh Gas Control
unit de-energizes the N
2
O selection valve.
Looks for a flow through the sidegas
transducer. If there is still a flow, this
indicates that there is N
2
O flowing and it
has not switched to Air.
1 Check voltage to the N
2
O/Air solenoid
valve.
2. Replace the N
2
O/Air selection valve.