Carrier 48LC 04 Controls, Start-Up, Operation And Troubleshooting page 50

DISPLAY
POINT DESCRIPTION
NAME
Input power from TRAN2
IGC.F IGC Fan Request
FDWN Fire shutdown switch
G Thermostat G (Fan)
W2 Thermostat W2 (2nd Stage Heat)
W1 Thermostat W1 (1st Stage Heat)
Y2 Thermostat Y2 (2nd Stage Cool)
Y1 Thermostat Y1 (1st Stage Cool)
FIL.S Filter status switch
HUM Humidistat switch input
Not Used
Not Used
SPT Space temperature (T55/56)
SPTO Space temperature offset (T56)
OAT Outdoor air temperature
SAT Supply air temperature
SCT.A Saturated condenser temperature, circuit A
Not Used
RAT Return Air Temperature
FAN.S Fan status switch
SSP .A Suction pressure, circuit A
Not Used
Not Used
L.ODF Low Ambient Outdoor Fan
Not Used
Not Used
IDF.1 Indoor Fan Speed relay 1
IDF.2 Indoor Fan Speed relay 2
IDF.3 Indoor Fan Speed relay 3
ALRM Alarm relay
COMP .A Circuit A Compressor
LDR.A Circuit A Loader
HT.1 Heat Stage 2 relay
HT.2 Heat Stage 1 relay
Local Equipment Network (LEN)
Carrier Comfort Network (CCN)
Network device power
Scrolling Marquee Display (LEN)
Scrolling Marquee Display power
Expansion LEN Bus
Optional ECB power
Table 16 – Main Base Board (MBB) Connections
SENSOR LOCATION
INPUTS
control box
gas section
supply/return/space
space
space
space
space
space
indoor fan section
space
space
space
outdoor coil support
indoor fan housing, or
supply duct
outdoor coil, circuit A
Return
indoor fan section
compressor A suction pipe
OUTPUTS
COMMUNICATION
50
CONNECTION
TYPE OF I/O
PIN NUMBER
24 VAC J1, 1--- 3
switch input J6, 4
switch input J6, 6
switch input J7, 2
switch input J7, 4
switch input J7, 6
switch input J7, 8
switch input J7, 10
switch input J9, 2--- 3
switch input J9, 5--- 6
0--- 5vdc digital input J9, 7--- 9
0--- 5vdc digital input J9, 10--- 12
10k thermistor J8, 1--- 2
10k thermistor J8, 2--- 3
10k thermistor J8, 5--- 6
10k thermistor J8, 7--- 8
5k thermistor J8, 9--- 10
5k thermistor J8, 11--- 12
10k thermistor J8, 13--- 14
switch input J8, 15--- 16
0--- 5 VDC pressure
J8, 18--- 20
transducer
0--- 5 VDC pressure
J8, 21--- 23
transducer
0--- 5 VDC J8, 24--- 26
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
communication J5, 1--- 3
communication J5, 5--- 7
24 VAC J5, 9--- 10
communication J4, 1--- 3
24 VAC J4, 5--- 6
communication J3, 1--- 3
24 VAC J2, 1--- 2