Q155 Service Manual
4-9
Figure 4-14 Oxygen sensor board
Note
Handle the new oxygen sensor board only by the edges to prevent electro static
damage to the unit.
4.6.4.
Oxygen Sensor Circuit Board Installation
i.
Install the oxygen sensor circuit board on the supports.
ii.
Firmly plug in the wire connector to the oxygen sensor circuit board.
iii.
Firmly plug in the tubing to the oxygen sensor circuit board.
iv.
Reconnect the cabinet.
4.7.
Product Regulator Setting and Replacement
The product regulator enables you to set the pressure of oxygen output by the Merits
unit. To check for proper adjustment of the product regulator, take the following
steps:
i.
Set the unit's ON/OFF switch to the OFF
position, and unplug the power cord
ii.
Remove the cabinet.(See section 4.2.1)
iii.
Plug the power cord, set the ON/OFF switch to the ON position
iv.
Run the unit for three minutes.
v.
Turn the flow meter adjustment knob set at 5 LPM.
vi.
Connect pressure gauge (or manometer) at the oxygen outlet. (See Figure
4-15)
vii.
Rotate the regulator knob on valve set to the 6.0
±
0.6psi. (See Figure 4-16)
viii.
Install the cabinet.
Clamp and
Tubing
Connector
Support