Carrier 48HC 04-28 Controls, Start-Up, Operation And Troubleshooting page 78

DISPLAY NAME POINT DESCRIPTION
INPUTS
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
Saturated condenser temperature,
SCT.A
circuit A
Saturated condenser temperature,
SCT.B
circuit B
RAT Return Air
Return
Temperature
FAN.S Fan status
indoor fan section
switch
SSP.A Suction pressure, circuit A
SSP.B Suction pressure, circuit B
Not Used
OUTPUTS
CRC Cooling Reheat Control
RH2.A Reheat 2 Valve Circuit A
RH2.B Reheat 2 Valve circuit B
IDF.1 Indoor fan relay 1
IDF.2 Indoor Fan relay 2
IDF.3 Indoor Fan relay 3
ALRM Alarm relay
COMP.B Compressor B1 relay
COMP.A Compressor A1 relay
HT.1 Heat Stage 2 relay
HT.2 Heat Stage 1 relay
COMMUNICATION
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 29 — Main Base Board (MBB) Connections
SENSOR LOCATION
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
outdoor coil, circuit B
10k thermistor
switch input
compressor A suction pipe
compressor B suction pipe
0-5 VDC
TYPE OF I/O
24 VAC
switch input
switch input
switch input
switch input
switch input
switch input
switch input
switch input
switch input
0-5vdc digital input
0-5vdc digital input
10k thermistor
10k thermistor
10k thermistor
10k thermistor
5k thermistor
5k thermistor
J8, 13-14
J8, 15-16
0-5 VDC pressure
transducer
0-5 VDC pressure
transducer
J8, 24-26
relay
relay
relay
relay
relay
relay
relay
relay
relay
relay
relay
communication
communication
24 VAC
communication
24 VAC
communication
24 VAC
78
CONNECTION PIN
NUMBER
J1, 1-3
J6, 4
J6, 6
J7, 2
J7, 4
J7, 6
J7, 8
J7, 10
J9, 2-3
J9, 5-6
J9, 7-9
J9, 10-12
J8, 1-2
J8, 2-3
J8, 5-6
J8, 7-8
J8, 9-10
J8, 11-12
J8, 18-20
J8, 21-23
J10, 3
J10, 6
J10, 9
J10, 11
J10, 13
J10, 16
J10, 19
J10, 21
J10, 23
J10, 25
J10, 27
J5, 1-3
J5, 5-7
J5, 9-10
J4, 1-3
J4, 5-6
J3, 1-3
J2, 1-2