Emerson Liebert iCOM Manual De Usuario
Operation
Liebert
®
iCOM
®
58
3.8
Supply Control
Up to 11 supply air sensors thermistors may be connected per unit, used as control or reference of the
discharge air temperature of the cooling unit. The supply temperature sensors should be installed in
an area that is influenced only by the unit it is connected to. The supply sensor should be 5-15 ft.
(1.5-4.5m) from the cooling unit to provide an accurate reading for the control. Two sensor types are
available for purchase. The sensor types can be used together based on user reference.
The standard supply air thermistor connects to P13 Pins 1 and 2. A 50 ft. (15m) extension cable is
The standard supply air thermistor connects to P13 Pins 1 and 2. A 50 ft. (15m) extension cable is
available from Emerson if the sensor must be more than 15 ft. (4.5m) from the Liebert iCOM. The
sensors require no configuration, just connection to the Liebert iCOM. Connectivity can be confirmed
through the unit view or sensor data.
Figure 48 Placing the supply air temperature sensor
For systems with larger supply air plenums, optional 2T supply air sensors may be connected via
CANbus to obtain a precise supply air temperature. Each 2T sensor reports two temperature values
to the Liebert iCOM. Up to five 2T sensors may be connected in addition to the standard supply air
thermistor. The Liebert iCOM will aggregate the readings and convert them into a user-defined
average or maximum sensor value for control purposes.
The first step in setting up the additional supply sensors is to program the dip switches using
The first step in setting up the additional supply sensors is to program the dip switches using
Table 10. The DIP switches may be accessed by removing the rear housing or through hole in the
housing. See Figure 71 for additional information.
After setting the DIP switches, follow the directions in 4.3.3 - Terminate the Final Sensor on the
CANbus Link to complete the sensor installation.
Once the sensors have been connected, go to Service Menus> Sensor Calibration/Setup (Figure 149).
Once the sensors have been connected, go to Service Menus> Sensor Calibration/Setup (Figure 149).
Locate the line that reads Supply Sensor Aggregation. Change the right hand parameter to Enabled.
Table 10
DIP switches in 2T sensors
Supply Sensor #
CANbus
Node ID
DIP switch Position
1
2
3
4
8
6
7
8
Sensor A
17
On
Off
Off
Off
On
Off
Off
Off
Sensor B
18
Off
On
Off
Off
On
Off
Off
Off
Sensor C
19
On
On
Off
Off
On
Off
Off
Off
Sensor D
30
Off
On
On
On
On
Off
Off
Off
Sensor E
31
On
On
On
On
On
Off
Off
Off
Sensors A through E are dual purpose CANbus ID’s in software. Sensors A-C (IDs 17-18) may alternatively be used for
temperature and humidity monitoring of the space. Sensors D and E (ID’s 30 and 31) may be used for fluid inlet and outlet
temperature monitoring. Verify application setup before installing additional supply air sensors. Adding duplicate sensors will
result in sensor communication loss.
temperature and humidity monitoring of the space. Sensors D and E (ID’s 30 and 31) may be used for fluid inlet and outlet
temperature monitoring. Verify application setup before installing additional supply air sensors. Adding duplicate sensors will
result in sensor communication loss.
Temperature
Sensor
Sensor
5 to 15feet
(1.5 to 4.5m)
(1.5 to 4.5m)
Internal Temperature
and Humidity Sensor
and Humidity Sensor
Return
Air
Air
Supply Air
Liebert
Cooling Unit