Huntleigh Flowtron AC550, Service Manual

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b) Inaccuracy of the pressure display - see Section 4.4 Pressure
Display Calibration.
Use the following procedure to check the pump:
1. Hold the Single Leg button down until display changes to Service
Mode resolution (see Section 3.2).
2. Set control knob to 12 o’clock position. Ensure garments are connected
to both outputs.
3. Connect a calibrated Manometer to one of the output ports. The
manometer reading should be within ± 2 mmHg of the display reading.
If not, follow the Pressure Display Calibration procedure as in Section
4.4.
4. At 12 o’clock the displayed pressure should be 40 mmHg
± 2mm - if
not, follow the Pressure Control Calibration procedure as in Section 4.3.
5. Check the other output port to the same specification.
6. Check the air flow of each output.
Flow specification With control knob set to 40 MmmHg
Minimum Flow 6.0 liter per minute free flow
With control knob set to Maximum (+)
Minimum flow 3.5 liter per minute
7. Switch the pump off, then on again, to revert to the normal resolution
mode.
8. Check that the display reads 40 on each output port when the pressure
control knob pointer is located within the 40 mmHg arc.
9. Check the Minimum and Maximum range settings.
Minimum setting is equal to or greater than 25 mmHg.
Maximum setting is equal to or less than 70 mmHg.
4.3 Pressure Control Calibration
1. Select the Service Mode as detailed in Section 3.2.
2. Set the control knob to 12 o’clock.
3. With a cross-head screwdriver rotate the control knob adjusting the
screw until the display reads 40 mmHg + 3/-0 mmHg on both outputs.
4.
247901 4-3 Issue 1
March 1998