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balance gas proportional valve to 300 mA. The balance gas limb flow and the total flow
displayed on the left should be above 0.
If the sensors indicate that no flow is detected, the N2O three-way valve or the balance gas
proportional valve is faulty.
If no flow is detected in step 9, the balance gas proportional valve is faulty. Otherwise, the
N2O three-way valve is faulty.
7.6.5.2 BFCS Failure Test
1. Properly connect the gas supply (O2 and AIR), and let the machine enter the standby state.
2. Select Setup > Service > Data Monitors > FCS to access the flowmeter data monitoring
screen. Open and close the BFCS door in turn, and observe the status of BFCS Door Switch
1 and BFCS Door Switch 2. A BFCS door switch is faulty if (a) the BFCS door is closed,
but one of BFCS Door Switch 1 and BFCS Door Switch 2 is in On state; (b) the BFCS door
is opened, but one of BFCS Door Switch 1 and BFCS Door Switch 2 is in Off state;.
3. Select Setup > Service > Diagnostic Tests > FCS Tests to access the FCS diagnostic test
screen.
4. Set the BFCS two-way valve to EFCS, and ensure that the O2 two-way valve, N2O
three-way valve and AIR three-way valve are in Off state. The O2 limb flow and the total
flow displayed on the left should not be above 0.1 L/min. Otherwise, the BFCS two-way
valve is faulty.
5. Set the BFCS two-way valve to BFCS, and ensure that the O2 two-way valve, N2O
three-way valve and AIR three-way valve are in Off state. The O2 limb flow and the total
flow displayed on the left should be above 0.5 L/min. If the flow is below 0.5 L/min, open
the BFCS door, and adjust the O2 needle valve anti-clockwise. If the flow increases when
the O2 need valve is adjusted, the O2 needle valve is faulty. Otherwise, the BFCS two-way
valve is faulty.
6. Check whether Electromagnet 1 and Electromagnet 2 are in Off state. If one or two
electromagnets are in On state, the corresponding electromagnets are faulty.
7. Set Electromagnet 1 and EFPM Electromagnet 1 to On. The state of Electromagnet 1
displayed on the left should change to On for 1s and then change to Off. Otherwise,
Electromagnet 1 is faulty.
8. Set Electromagnet 2 and EFPM Electromagnet 2 to On. The state of Electromagnet 2
displayed on the left should change to On for 1s and then change to Off. Otherwise,
Electromagnet 2 is faulty.
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