Carrier 48/50PG C03-14, 48/50PM C16-28 manual MBB Connections, 48/50PG and PM

48/50PG and PM

Table 23 – MBB Connections

DISPLAY	POINT DESCRIPTION	SENSOR LOCATION	TYPE OF I/O	CONNECTION
NAME				PIN NUMBER
		INPUTS
	Input power from TRAN1	control box	24 VAC	J1, 1-3
HUM	IGC Fan Request or	gas section /	switch input	J6, 4
	Humidistat switch input	space
FDWN	Fire shutdown switch	supply/return/space	switch input	J6, 6
G	Thermostat G (Fan)	space	switch input	J7, 2
W2	Thermostat W2 (2nd Stage Heat)	space	switch input	J7, 4
W1	Thermostat W1 (1st Stage Heat)	space	switch input	J7, 6
Y2	Thermostat Y2 (2nd Stage Cool)	space	switch input	J7, 8
Y1	Thermostat Y1 (1st Stage Cool)	space	switch input	J7, 10
FIL.S	Filter status switch	indoor fan section	switch input	J9, 2-3
CS.A1	Compressor A1 Current Sensor	control box	0-5vdc digital input	J9, 4-6
CS.B1 or	Compressor B1 or	control box	0-5vdc digital input	J9, 7-9
CS.A2	A2 Current Sensor
CS.C1 or	Compressor C1or	control box	0-5vdc digital input	J9, 10-12
CS.B1	B1 Current Sensor
SPT	Space temperature (T55/56)	space	10k thermistor	J8, 1-2
SPTO or	Space temperature offset (T56) or	space or return	10k thermistor	J8, 2-3
RAT	Return air temperature
OAT	Outdoor air temperature	outdoor coil support	10k thermistor	J8, 5-6
SAT	Supply air temperature	indoor fan housing, or	10k thermistor	J8, 7-8
		supply duct
SCT.A	Saturated condenser temperature, circuit A	outdoor coil, circuit A	5k thermistor	J8, 9-10
SCT.B	Saturated condenser temperature, circuit B	outdoor coil, circuit B	5k thermistor	J8, 11-12
SCT.C	Saturated condenser temperature, circuit C	outdoor coil, circuit C	5k thermistor	J8, 13-14
FAN.S	Fan status switch	indoor fan section	switch input	J8, 15-16
SSP.A	Suction pressure, circuit A	compressor A suction	0-5 VDC pressure	J8, 18-20
			transducer
SSP.B	Suction pressure, circuit B	compressor B suction	0-5 VDC pressure	J8, 21-23
			transducer
SSP.C	Suction pressure, circuit C	compressor C suction	0-5 VDC pressure	J8, 24-26
			transducer

OUTPUTS

CRC	Cooling Reheat Control
CMP.C or	Compressor C1 relay or
OFC.2	Outdoor fan 2 relay
COMP.B	Compressor B1 relay
COMP.A	Compressor A1 relay
CCH or	Crankcase heat relay or
OFC.3	Outdoor fan 3 relay or
OFC.1	Outdoor fan 1 relay
OFC.2 or	Outdoor fan 2 relay or
RH2.B	Reheat 2 valve circuit B & C
OFC.1 or	Outdoor fan 1 relay or
RH2.A	Reheat 2 valve circuit A
IDF	Indoor fan relay
ALRM	Alarm relay
HT.1	Heat Stage 2 relay
HT.2	Heat Stage 1 relay

COMMUNICATION

relay	J10, 3
relay	J10, 6
relay	J10, 9
relay	J10, 11
relay	J10, 13
relay	J10, 16
relay	J10, 19
relay	J10, 21
relay	J10, 23
relay	J10, 25
relay	J10, 27

Local Equipment Network (LEN)	communication	J5, 1-3
Carrier Comfort Network (CCN)	communication	J5, 5-7
Network device power	24 VAC	J5, 9-10
Scrolling Marquee Display (LEN)	communication	J4, 1-3
Scrolling Marquee Display power	24 VAC	J4, 5-6
Optional ECB (LEN)	communication	J3, 1-3
Optional ECB power	24 VAC	J2, 1-2

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