Carrier 50PD05 Operating And Service Instructions page 48

Table 1 9 -- MBB Connections
DISPLAY CONNECTION
NAME POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O 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
CMRA 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 1Ok thermistor J8, 1-2
SPTO Space temperature offset (T56) space 1Ok thermistor J8, 2-3
OAT Outdoor air temperature outdoor coil support 1Ok thermistor J8, 5-6
indoor fan housing, or 1Ok thermistor J8, 7-8
SAT Supply air temperature 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 1Ok thermistor J8, 13-14
FAN.S Fan status switch indoor fan section switch input J8, 15-16
0-5 VDC pressure J8, 18-20
SSRA Suction pressure, circuit A compressor A suction 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 (AUXl) LEN communication J3, 1-3
Optional ECB power 24 VAC J2, 1-2
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