Specifications

JOHNSON CONTROLS
176
FORM 150.72-NM1 (908)
Maintenance
Chiller data that can be read and modied using specic Modbus Register Addresses; and the data associated with
the addresses, is outlined in the following description:
SERIAL COMMUNICATION ANALOG VALUE DATA
This data can be read and modied using a BACnet or Modbus network connection. The Modbus Register Address
for these points is 1025 + AV #.
AV BACNET NAME ANALOG VALUE DESCRIPTION
1 REM_SETP
SETPOINT
COOLING SETPOINT (HP ONLY), 99 = AUTO
(40 °F - 70 °F)
2 SP_REM_SP_S1 SYS 1 SETPOINT (SUCTION PRESSURE CONTROL)
3 LOAD_LIMIT LOAD LIMIT STAGE (0, 1, 2)
4 REM_CR COOLING RANGE (DAT MODE ONLY)
5 SP_REM_SP_S2 SYS 2 SETPOINT (SUCTION PRESSURE CONTROL)
6 REM_SP_HEAT
HEATING SETPOINT (HP ONLY) 99 = AUTO (95 °F - 122
°F)
7 HP_MODE
MODE (HP ONLY) (0 = PANEL, 1 = COOLING, 2 =
HEATING)
SERIAL COMMUNICATION BINARY VALUE DATA
This data can be read and modied using a BACnet or Modbus network connection. The Modbus Register Address
for these points is 1537 + BV #.
BV BACNET NAME BINARY VALUE DESCRIPTION
1 START_STOP START / STOP COMMAND
2 SS_SYS1
SYS 1 START / STOP COMMAND (SUCTION PRESSURE
CONTROL)
3 SS_SYS2
SYS 2 START / STOP COMMAND (SUCTION PRESSURE
CONTROL)
SERIAL COMMUNICATION ANALOG INPUT DATA
This data can be read using a BACnet or Modbus network connection and can NOT be modied using this connection.
The Modbus Register Address for these points is 513 + AI #.
AI BACNET NAME ANALOG INPUT DESCRIPTION
1 LCHLT LEAVING CHILLED LIQUID TEMP
2 RCHLT RETURN CHILLED LIQUID TEMP
3 DAT DISCHARGE AIR TEMP (COND UNIT ONLY)
4
S1_SUCT_
TEMP
SYS 1 SUCTION TEMPERATURE (EEV AND COND UNIT ONLY)
5 OAT AMBIENT AIR TEMPERATURE
6 S1_SUCT_SH SYS 1 SUCTION SUPERHEAT (EEV ONLY)
7 S1_RUN_TIME SYS 1 RUN TIME (SECONDS)
8 S1_SUCT_PR SYS 1 SUCTION PRESSURE
9 S1_DSCH_PR SYS 1 DISCHARGE PRESSURE
10 S1_CIR_TEMP SYS 1 COOLER INLET REFRIGERANT TEMPERATURE (R-407C ONLY)
11 S1_DEF_TEMP SYS 1 DEFROST TEMPERATURE (HP ONLY)
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