AirSep MN138-1 H - Manual (Page 27)

21
MN138-1 Rev H
02/14
4.11 Hour Meter Replacement
FOR P/N: HM009-2 ONLY: HM009-2 is a dual timer hour meter.
To toggle between the two display screens - press the pinhole reset
switch once to display “TMR1” mode.
To reset the timer display – confirm that “TMR1” is displayed in the
upper left corner. Press and hold the pinhole reset switch for 3 seconds
until 0.0 is displayed.
Hour Meter Removal
To remove the hour meter, follow the steps below:
1. Set the unit’s I /0 switch to the “0” position and unplug the power cord.
2. Remove front panel and locate hour meter.
3. To gain access to the underside of the hour meter, remove screw securing the
right mounting plate assembly to the center section using a Phillips-head
screwdriver.
4. Lift assembly out from unit and disconnect wires from hour meter.
5. While pressing in the securing tabs located in each corner of hour meter, push
hour meter through the front of the mounting plate. (It may be easier to perform
this step to one side of the hour meter at a time.)
Hour Meter Installation
To install a new hour meter, follow the steps below:
1. Follow the removal procedure for the hour meter in reverse order.
2. Be sure to reinstall the new hour meter properly by having the ‘hourglass’ icon
located on the bottom when finished.
3. The top two hour meter wire connections should be from the white wire from
power cord and the white wire from the circuit board harness.
4. The lower two hour meter wire connections should be from the black wire from
the I /0 power switch and the black wire from the circuit board harness.
5. Connections for the same color wires can be made to either terminal.
4.12 Flow meter Replacement
Care must be taken when removing and installing the flowmeter on
units equipped with an O2 monitoring systems to prevent damaging
circuit board sensor. The tubing assembly from the top of the flow
meter is connected to sensor.
Flowmeter Removal
To remove the flow meter, follow the steps below:
1. Set the unit’s I /0 switch to the “0” position and unplug the power cord.
2. Remove the front panel and locate flow meter.
3. To gain access to the underside of the flow meter, remove screw securing the left
mounting plate assembly to the center section using a Phillips-head screwdriver.
4. Carefully lift assembly out from unit.
5. Cut only the top tie-wraps on each tubing connection of flow meter and
disconnect tubing from flow meter.
6. Remove flow meter nuts securing flow meter to the mounting plate, remove flow
meter.