Specifications
Building Automation Systems
All MicroTech II controllers with Open Choices™ are capable of BAS communications, providing easy
integration and comprehensive monitoring, control, and two-way data exchange with open standard protocols
such as L
onTalk
, Modbus or BACnet.
Open Choices
Benefits
•
•
Easy to integrate into your building automation system of choice
•
•
Factory-installed and tested communication module
•
•
Comprehensive point list for system integration, equipment monitoring and alarm notification
•
•
Provides efficient equipment operation
•
•
Owner/designer can select the BAS that best meets building requirements
•
•
Comprehensive data exchange
Integration Made Easy
McQuay unit controllers strictly conform to the interoperability guidelines of the L
ON
M
ARK
Interoperability
Association and BACnet International. They have received L
ON
M
ARK
certification with optional L
ON
W
ORKS
communication module.
Protocol Options
•
•
BACnet MS/TP
•
•
LONWORKS (FTT-10A)
•
•
BACnet IP
•
•
Modbus RTU
•
•
BACnet Ethernet
The BAS communication module can be ordered with a chiller and factory-mounted or can be field-mounted at
any time after the chiller unit is installed.
Table 13, Typical Data Point Availability
Typical Data Points
1
(W = Write, R = Read)
Active Setpoint R Cond EWT R Evap Water Pump Status R
Actual Capacity R Cond Flow Switch Status R Liquid Line Refrigerant Pressure R
Capacity Limit Output R Cond LWT R Liquid Line Refrigerant Temp R
Capacity Limit Setpoint W Cond Pump Run Hours R Maximum Send Time W
Chiller Enable W Cond Refrigerant Pressure R Minimum Send Time W
Chiller Limited R
Cond Sat. Refrigerant
Temp
R Network Clear Alarm W
Chiller Local/Remote R Cond Water Pump Status R Pump Select W
Chiller Mode Output R Cool Setpoint W Run Enabled R
Chiller Mode Setpoint W Current Alarm R
Chiller On/Off R Default Values W
Chiller Status R Evap EWT R
Compressor Discharge Temp R Evap Flow Switch Status R
Compressor Percent RLA R Evap LWT for Unit R
Compressor Run Hours R Evap LWT for Compressor R
Compressor Select W Evap Pump Run Hours R
Compressor Starts R Evap Refrigerant Pressure R
Compressor Suction Line
Temp
R
Evap Sat. Refrigerant
Temp
R
Note: Data points available are dependent upon options selected.
Connection to Chiller
Connection to the chiller for all BAS protocols will be at the unit controller. An interface card, depending on
the protocol being used, will have been factory installed in the unit controller if so ordered, or it can be field
installed.