Operating instructions

10
Table 3 — Main Base Board Inputs and Outputs
LEGEND
DESCRIPTION INPUT/OUTPUT I/O TYPE DISPLAY MODULE POINT NAME
CONNECTION POINT
Pin Notation
Power (24 vac supply) —— —
MBB-J1, MBB-J1A,
MBB-J1B
11 24 vac
12 Ground
Local Equipment Network —— —
MBB-J9A, MBB-J9B,
MBB-J9C, MBBJ9D
+RS485 Port (D+)
G RS485 Port (Gnd)
- RS485 Port (D-)
Carrier Communication
Network
—— —
MBB-J12
+RS485 Port (D+)
G RS485 Port (Gnd)
- RS485 Port (D-)
Chilled Water Flow Switch CWFS Switch Cooler Flow Switch, LOCK
MBB-J5B-CH17
17
Demand Limit Switch No. 1 Demand Limit SW1 Switch Limit Switch 2 Status, DLS1 MBB-J4-CH13
Circuit A Discharge
Pressure Transducer
DPTA Pressure Transducer Discharge Pressure, DP.A
MBB-J7A-CH6
5V +5 vdc Ref.
SSignal
RReturn
Circuit B Discharge
Pressure Transducer
DPTB Pressure Transducer Discharge Pressure, DP.B
MBB-J7C-CH8
5V +5 vdc Ref.
SSignal
RReturn
Dual Chiller
LWT Thermistor
DUAL 5k Thermistor CHWS Temperature, CHWS MBB-J6-CH3
Dual Set Point Input Dual Set Point Switch Remote Setpoint Switch, DUAL MBB-J4-CH12
Entering Water Thermistor EWT 5k Thermistor Cooler Entering Fluid, EWT MBB-J6-CH2
Leaving Water Thermistor LWT 5k Thermistor Cooler Leaving Fluid, LWT MBB-J6-CH1
Outdoor Air Thermistor OAT 5k Thermistor External Temperature, OAT MBB-J6-CH4
External Chilled
Water Pump Interlock
PMPI Switch Electrical Box Interlock, ELEC MBB-J4-CH15A
Circuit A Suction
Pressure Transducer
SPTA Pressure Transducer Suction Pressure, SP.A
MBB-J7B-CH7
5V +5 vdc Ref.
SSignal
RReturn
Circuit B Suction
Pressure Transducer
SPTB Pressure Transducer Suction Pressure, SP.B
MBB-J7D-CH9
5V +5 vdc Ref.
SSignal
RReturn
Unit Status Remote Contact-Off-Enable Switch On/Off Remote Switch, ONOF MBB-J4-CH11
Alarm Relay ALM R Relay Alarm Relay Output, ALRM MBB-J3-CH24
Alert Relay ALT R Relay Alert Relay Output, ALRT MBB-J3-CH25
Cooler Heater CL-HT Contactor Cooler Heater Command, CO.HT MBB-J3-CH26
Isolation Valve A ISVA Contactor Ball Valve Position, BVL.A MBB-J2A-CH19
Isolation Valve B ISVB Contactor Ball Valve Position, BVL.B MBB-J2A-CH20
Isolation Valve C (Size 400-500) ISVC Contactor Ball Valve Position, BVL.C MBB-J2C-CH22
Oil Heater A (Size 080, 082 only) OIL HT_A Contactor Circuit A Oil Heater, HT.A MBB-J2C-CH22
Oil Heater B (Size 080, 082 only) OIL HT_A Contactor Circuit B Oil Heater, HT.B MBB-J2C-CH23
Pump #1 Interlock
Pump #2 Interlock
PMP1
PMP2
Switch Cooler Pump Run Status, PUMP MBB-J5C-CH18
I/O — Input or Output
LWT — Leaving Water Temperature