Carrier 48/50PD05 MBB Connections, Point Description, Sensor Location, Type Of I/O, Name, Inputs

48/50PD

Table 19 — 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
	IGC Fan Request	gas section	switch input	J6,	4
FDWN	Fire shutdown switch	supply/return/space	switch input	J6,	6
HUM	Space Humidity switch	space	switch input	J7,	4
	Digital Scroll Unloader		switch input	J7,	6
C.ALM	Scroll Compressor Alarm		switch input	J7,	8
CMP.A	Compressor A Feedback		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, 10	---12
SPT	Space temperature (T55/56)	space	10k thermistor	J8, 1	---2
SPTO	Space temperature offset (T56)	space	10k thermistor	J8, 2	---3
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
RAT	Return air temperature	Return air Section	10k 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
		OUTPUTS
CTLR	Digital Scroll Ctrl Pwr		relay	J10,	11
CCH	Crankcase heat relay		relay	J10,	13
OFC.1	Outdoor fan 1 relay		relay	J10,	19
IDF	Indoor fan VFD pwr relay		relay	J10,	21
ALRM	Alarm relay		relay	J10,	23
HT.1	Heat Stage 2 relay		relay	J10,	25
HT.2	Heat Stage 1 relay		relay	J10,	27
		COMMUNICATION
	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
	Modulation Board (AUX1) LEN		communication	J3, 1	---3
	Optional ECB power		24 VAC	J2, 1	---2

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