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low pressure trip is varied based upon the glycol ratio.
3.12
Sensor Offsets
This screen allows the control values of the analog input points to be adjusted if
calibration shows these devices to be inaccurate. The range of these offsets that can
be entered is from -99.9 to 99.9. Care must be used when applying an offset to an
analog value as erratic operation can result. To modify the offsets, press the ENTER
key until the desired offset is selected and use the arrow keys until the desired setting
is shown. Pressing the ENTER key will now change the offset.
3.13
Building Management Communication
The Building Management Communications is set to correspond with the serial card
installed in the controller. The communication types available with a CM35xx controller
are LONWORKS®, BACnet™ MSTP, BACnet™ EtherNET or ModBus® Slave. The
correct serial card must be installed in the controller for the BMS communications to
be active. In the ModBus® Slave mode, the baud rate and address will be displayed.
The baud rate can be set to 1200, 2400, 4800, 9600 or 19200. The address should be
set to the node number for the dehumidifi er on the ModBus® network.
4.
Alarm Menu
The ALARM MENU can be accessed anytime by pressing the ALARM key. The main Alarm
Screen includes the instructions for viewing and resetting the alarms, as well as a means to
access the Alarm History Screen. Pressing the ENTER key while viewing the main Alarm
Screen will reset any alarm that has returned to its safe state. Please note that active alarms
can only be reset on this screen and not while the alarm is being displayed. Return to this
screen and press the ENTER key to reset any alarm that has returned to its safe state. Any
active alarm can be viewed by pressing the DOWN key from this screen. If no alarm screen is
shown, no alarms are active. To view the Alarm History Screen, press the ALARM key.
4.1
Alarm History Screen
The Alarm History Screen is accessible from the main Alarm Screen by pressing the
ALARM key. This screen lists a history of alarm conditions by time and date which
have existed on the unit. The most recent alarm will be displayed as 001. The
condition that triggered the alarm will be displayed along with the sensor data saved
at the time the alarm was triggered. This is done to aid in troubleshooting the alarm
condition. To access the entire listing of the alarm history, use the DOWN key to scroll
through the recorded alarms.
Desert Aire - CM35xx Quick Start Guide
11
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