Hoffrichter TRENDvent, Руководство по обслуживанию

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8.3 O2 VALVE TEST
The O2 valve test should be carried out as part of the annual maintenance or after the repair of rele-
vant components. If it has been assured that the device is exclusively used without an oxygen sup-
ply, the O2 test can be omitted.
During the O2 valve test, a tube system must not be connected to the device. It should fur-
thermore be noted that ventilation is switched off.
We recommend that a flow sensor calibration is carried out before the O2 valve test.
The O2 valve test checks that the O2 valve is functioning properly.
Carry out the O2 valve test as follows:
1. Connect the device to the mains power.
2. Connect the tube from the oxygen source to the oxygen connection adapter.
3. Insert the O2 connection adapter into the oxygen connection ( ).
Only the O2 connection adapter supplied may be used to connect oxygen. Otherwise,
there is a risk that the back-stop in the connection is damaged.
Fats or oils must not be used as lubricants in the area around the O2 connection. There
is a risk for fire and explosion.
4. Switch the device on.
5. Activate the Clinic mode.
6. Activate the Service screen using the or cursor key.
7. Select “O2 Valve Check” using the cursor key or touch wheel.
8. Press the OK button.
9. Enter the PIN code 1302 using the cursor keys or touch wheel. Pressing the OK button
switches to the next number, respectively.
10. The O2 valve test is started. The current pressure and current flow are displayed. The flow
value must correspond approximately with the value at which the oxygen is introduced. If the
flow value displayed is lower or zero, then the O2 valve is not working properly. The same
applies if the pressure value is larger than zero.