Carrier 30XW150-400 Main Base Board Inputs and Outputs, Circuit B Discharge, Dual Chiller

Table 3 — Main Base Board Inputs and Outputs

DESCRIPTION	INPUT/OUTPUT	I/O TYPE	DISPLAY MODULE POINT NAME	CONNECTION POINT
				Pin		Notation
				MBB-J1, MBB-J1A,
Power (24 vac supply)	—	—	—			MBB-J1B
				11		24 vac
				12		Ground
				MBB-J9A, MBB-J9B,
				MBB-J9C, MBBJ9D
Local Equipment Network	—	—	—	+		RS485 Port (D+)
				G		RS485 Port (Gnd)
				-		RS485 Port (D-)
						MBB-J12
Carrier Communication	—	—	—	+		RS485 Port (D+)
Network				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 1 Status, DLS1			MBB-J4-CH13
Condenser Flow Switch	CDFS	Switch	Condenser Flow Switch, COND	16A		MBB-J5A-CH16A
						MBB-J7A-CH6
Circuit A Discharge	DPTA	Pressure Transducer	Discharge Pressure, DP.A	5V		+5 vdc Ref.
Pressure Transducer				S		Signal
				R		Return
						MBB-J7C-CH8
Circuit B Discharge	DPTB	Pressure Transducer	Discharge Pressure, DP.B	5V		+5 vdc Ref.
Pressure Transducer				S		Signal
				R		Return
Dual Chiller	DUAL	5k Thermistor	CHWS Temperature, CHWS			MBB-J6-CH3
LWT Thermistor
Dual Set Point Input	Dual Set Point	Switch	Remote Setpoint Switch, DUAL			MBB-J4-CH12
Heat/Cool Switch	HC_SW	Switch	Heat/Cool Select Contact, HC_SW			MBB-J4-CH14
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
Condenser Entering Water	CEWT	5k Thermistor	Condenser Entering Fluid, CEWT			MBB-J6-CH5
Thermistor
Condenser Leaving Water	CLWT	5k Thermistor	Condenser Leaving Fluid, CLWT			MBB-J6-CH4
Thermistor
External Chilled	PMPI	Switch	Electrical Box Interlock, ELEC		MBB-J4-CH15A
Water Pump Interlock
						MBB-J7B-CH7
Circuit A Suction	SPTA	Pressure Transducer	Suction Pressure, SP.A	5V		+5 vdc Ref.
Pressure Transducer				S		Signal
				R		Return
						MBB-J7D-CH9
Circuit B Suction	SPTB	Pressure Transducer	Suction Pressure, SP.B	5V		+5 vdc Ref.
Pressure Transducer				S		Signal
				R		Return
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 Pump Relay 1	PMP1	Contactor	Cooler Pump 1, CPUMP_1		MBB-J2A-CH19
Cooler Pump Relay 2	PMP2	Contactor	Cooler Pump 2, CPUMP_2		MBB-J2A-CH20
Condenser Pump Relay	CPMP	Contactor	Condenser Pump, COND_PMP		MBB-J2C-CH22
Pump #1 Interlock	PMP_1	Switch	Cooler Pump Run Status, PUMP		MBB-J5C-CH18
Pump #2 Interlock	PMP_2

LEGEND

I/O — Input or Output

LWT — Leaving Water Temperature

Compressor Protection Module (CPM) — There is one CPM per compressor. See Fig. 9. The device controls the compressor contactors, oil solenoid, and loading/unloading the solenoid. The CPM also monitors the compressor motor tem- perature, high pressure switch, oil level switch, discharge gas temperature, oil pressure transducer, motor current, MTA (must trip amps) setting and economizer pressure transducer (sizes 175,200,350,400 only). The CPM responds to com- mands from the MBB (Main Base Board) and sends the MBB the results of the channels it monitors via the LEN (Local

Equipment Network). The CPM has three DIP switch input banks, Switch 1 (S1), Switch 2 (S2), and Switch 3 (S3). The CPM board DIP switch (S1) configures the board for the type of starter, the location and type of the current transformers and contactor failure instructions. See Table 4 for description of DIP switch 1 (S1) inputs. See Appendix D for DIP switch settings.

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