Structural/Accessory Maintenance
158
Battery
The recording chart is driven by a
battery-powered quartz motor and reducing gear.
The battery charge should be checked during unit
pre-trip inspection or once a month. To check the
battery charge, press the button the voltage
indicator:
• Blue Zone — Battery good. If the indicator
needle remains in the blue zone when the test
button is depressed, the battery has sufficient
power to operate the recorder.
• White Zone — Replace battery within 30
days. If the indicator needle remains in the
white zone when the test button is depressed
during a pre-trip inspection, replace the
battery. Although the battery may operate the
recorder up to 30 more days, replacing the
battery before it is completely dead is
recommended.
• Red Zone — Dead battery. If the indicator
needle remains in the red zone when the test
button is depressed, the battery is dead and
must be replaced.
To replace the battery:
1. Raise the stylus away from the chart by
rotating the pen lift gear clockwise 30 degrees
and releasing the lifting arm. The pen will
remain in the raised position. Remove the
knurled chart nut from the drive shaft and
remove the chart.
2. Loosen the four setscrews that hold the
recording platen in the recorder. The setscrews
do not remove from the recorder base.
3. Rotate the recording platen counterclockwise
and remove the platen.
4. Remove the battery from the recorder.
5. Install a new battery in the recorder making
sure the battery’s positive (+) and negative (-)
poles are correctly aligned.
6. Press the button on the voltage indicator to
make sure the indicator needle is the in blue
zone.
7. Check to see that the quartz motor is running.
Look through the inspection window and
make sure the internal flywheel on the quartz
motor is revolving.
8. Replace the recording platen on the recorder
base and rotate clockwise to view setscrews.
Tighten four set-screws that hold the platen in
the recorder
9. Replace the recording chart and chart nut on
the chart drive shaft and tighten the chart nut
finger tight
10. Lower the pen by rotating the lifting arm
counterclockwise and push the pen against the
chart.
Recording Chart Replacement
1. To change the charts, raise the stylus away
from the chart by rotating the pen lifting arm
clockwise 30 degrees and releasing the lifting
arm. The pen will remain in the raised
position. Remove the knurled chart nut from
the drive shaft and remove the chart.
2. Install the new chart in the slot on the platen
and on the chart drive shaft. Position the chart
edge under three hold-down flanges.
3. Replace the chant nut loosely and rotate the
chart so that the correct date and time are
indicated by the arrow on the time scale plate.
Finally hold the recording chart in position
and tighten the chart nut finger tight.
4. Lower the pen by rotating the lifting arm
counterclockwise and pushing the pen against
the chart.
Marking System Calibration
1. Visually inspect the recording thermometer
sensing bulb located in the evaporator near the
return air grille. Make sure it is securely
fastened and clear of debris.
2. Start the unit and adjust the temperature
setpoint to 0 C (32 F). Operate the unit until
the return air temperature reaches 0 C (32 F).
Enter the View menu on the controller display
and scroll to the return air temperature
(“RET”) screen. Press the E
NTER key to lock
the “RET” screen on the display.
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