OM 780-2 Page 27
• Set the Comm Loss/Power Up State to Enable
• Set the Comm Loss Cool Setpoint to 50.
If the chiller’s L
ONWORKS communication module does not receive an updated command on its Chiller Enable input within
250 seconds, it determines that it has lost communication with the CSM. The chiller’s L
ONWORKS communication module
will then enable the chiller (if it is not already enabled).
Example #2: You want a chiller to always shut down when the CSM is no longer supervising it:
• Set that chiller’s Receive Heartbeat to 250 seconds
• Set the Comm Loss/Power Up State to Disable
Note: For Comm Loss Control at the Chiller to operate properly the Comm Loss Defaults value on the Chiller Setup screen
must read Off, this value is read-only.
Setting Up the CSM’s I/O
The CSM requires you to enter certain details of the connected inputs and outputs to perform proper system control. The
variables are located on the I/O Config screen and described in Table 6.
Table 6. I/O Config (Main > Configuration > I/O Config)
Name Description
Return Chilled Water Sensor Present
Flag
This input tells the CSM if this optional sensor has been wired to the CSM. When the Flag = No, the
sensor cannot change to (or from) alarm. Default = No
Entering Condenser Water Sensor
Present Flag
This input tells the CSM if this optional sensor has been wired to the CSM. When the Flag = No, the
sensor cannot change to (or from) alarm. Default = No
Leaving Condenser Water Sensor
Present Flag
This input tells the CSM if this optional sensor has been wired to the CSM. When the Flag = No, the
sensor cannot change to (or from) alarm. Default = No
Decoupler Line Water Sensor Present
Flag
This input tells the CSM if this optional sensor has been wired to the CSM. When the Flag = No, the
sensor cannot change to (or from) alarm. Default = No
Outdoor Air Temperature Source This input tells the CSM where the outside air temperature value will be input from. Range = None,
Local (onboard I/O), BACnet, Modbus, or Chiller X. Default = None
Supply Chilled Water Sensor Offset
Return Chilled Water Sensor Offset
Entering Cond Water Sensor Offset
Leaving Cond Water Sensor Offset
Decoupler Line Water Sensor Offset
Local Outdoor Air Temp Sensor Offset
Value added to the internally calculated value for the temperature input before it passes to the application
software. Allows for wiring or sensor-to-system compensation. Range = Can be positive or negative as
needed. Default = 0
Flow Meter Present Flag This input tells the CSM if a flow meter has been wired to the CSM. When the Flag = No, the sensor
cannot change to (or from) alarm. Default = No
Flow Meter Location This input tells the CSM where the flow meter (if used) is located in the system. Range = Decoupler
Line, Common Supply Line. Default = Decoupler Line
Flow Meter Low Calibration Rate Use this variable to enter the flow rate when the transducer signal is one of the following: a) 4 mA for 4–
20 mA transducers or b) 2 Vdc for 2–10 Vdc transducers. Range = 0 – 5120 gpm (0.0 – 322.5 L/s).
Default = 0
Flow Meter High Calibration Rate Use this variable to enter the flow rate when the transducer signal is one of the following: a) 20 mA for
4–20 mA transducers or b) 10 Vdc for 2–10 Vdc transducers. Default = 1000 gpm (63.0 L/s)
Flow Meter Offset Value added to the internally calculated value for the flow rate input before it passes to the application
software. Allows for wiring or sensor-to-system compensation. Range = Can be positive or negative as
needed. Default = 0
Loop Differential Pressure Sensor
Present Flag
This input tells the CSM if a differential pressure sensor has been wired to the CSM. When the Flag =
No, the sensor cannot change to (or from) alarm. Default = No
Loop DP Sensor Low Calibration
Pressure
Use this variable to enter the differential pressure when the transducer signal is one of the following: a) 4
mA for 4–20 mA transducers or b) 2 Vdc for 2–10 Vdc transducers. Range = 0 – 150 psi (0 – 1035 kPa).
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