Maritime Geothermal WH-Series, Installation And Service Manual

Page: 36 / 77

Page 36 002028MAN-01 1-Oct-2015
BACNet INTERFACE
The BACNet interface is an MS/TP connection via RS-485 twisted pair. There is a termination jumper if required to terminate the con-
nection. It is located just above the BACNet connector., marked as TERM on the control board.
The connector on the control board is a three wire removable screw connector. The signals are as follows:
A: Communications line (+)
B: Communications line (-)
C: Ground
connection
The following parameters can be set via the LED Display Configuration Menu or via the PC APP Configuration Page.
1) Baud rate
2) Instance number
3) MAC address
The following tables provide a list of the available objects along with a description of each.
TABLE 8 - BACNet OBJECTS - CONTROL (READ/WRITE)
Name Data Type Property Description
SYSTEM_Y1A Binary Input Present Value Control signal to start / stop compressor (active is on)
SYSTEM_Y2A Binary Input Present Value Control signal to start / stop compressor stage 2 solenoid (active is on)
SYSTEM_O Binary Input Present Value Control signal to switch system modes. Inactive = HEATING , Active = COOLING
Note: object names may be subject to change without prior notice.
TABLE 9 - BACNet OBJECTS - DATA (READ ONLY)
Name Data Type Property Units Description
LPS1 Analog Input Present Value PSIG (kPa) Low pressure value (suction pressure)
HPS1 Analog Input Present Value PSIG (kPa) High pressure value (discharge pressure)
SATURATED1 Analog Value Present Value degF (degC) Evaporating Temperature
SATURATED1 Analog Value Setpoint Value degF (degC) Condensing Temperature
TS1 Analog Input Present Value degF (degC) Suction line temperature
TS1 Analog Input Setpoint Value degF (degC) Superheat
EEV1_POS Analog Output Present Value % EEV position (% open)
I_IN Analog Input Present Value degF (degC) Indoor IN temperature
I_OUT Analog Input Present Value degF (degC) Indoor OUT temperature
AI_0 Analog Input Present Value A Compressor current draw (AI0) - ACCESSORY
AI_1 Analog Input Present Value User Selectable User defined (0-10VDC or 4-20mA)
AI_2 Analog Input Present Value User Selectable User defined (0-10VDC or 4-20mA)
AI_3 Analog Input Present Value User Selectable User defined (0-10VDC or 4-20mA)
AI_4 Analog Input Present Value User Selectable User defined (0-10VDC or 4-20mA)
AI_5 Analog Input Present Value User Selectable User defined (0-10VDC or 4-20mA)
Note: objects may be subject to change without prior notice.