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Liebert MR1 • 9
Section 4: OPERATION
LCD and Keypad
When power is first applied, the MR1 performs self-
initialization and then enters the normal display mode. The
display alternates between showing the temperature and
humidity readings, and cooling/heating, de/humidification, and
econocycle operating status.
Pressing the HOLD button will lock on the temperature or
humidity reading, continuously updating it two times per second.
It will continue to display the same parameter until the SCAN
button is pressed or a new alarm occurs.
Figure 4. LCD Display
When you press the SCAN button, the MR1 first scans through
the active alarms if any exist, then scans through the heating,
cooling, de/humidification, and econocycle/capacity. On chilled
water/hot water units, percent capacity indicates the valve
position. On units equipped with econocycle, cooling will
reflect the valve position. If econocycle is not available,
econocycle capacity status is skipped.
While scanning, the HOLD button can be pressed to lock the
display on the current item for continuous updating. To return
to scanning, press the SCAN button again. After all parameters
have been displayed, the monitor returns to the normal
alternating status display.
Should a new alarm occur while scanning (or at any other time),
the MR1 immediately displays the alarm and annunciates it if
the beeper is enabled. The alarm can be silenced by pressing the
SILENCE button. On Small Systems Controls, silencing an
alarm at the MR1 will also silence the alarm at the unit; on other
microprocessors, an alarm that is no longer active can be reset
from the MR1 by pressing the SILENCE button.
OFF is displayed when the MR1 has been turned off; OFF
flashes if communication between the MR1 and the
Environmental unit is disrupted.
With DIP switch #2 in the ON position and monitoring a unit
equipped with remote on/off capability, pressing the ON/OFF