Carrier 48LC 04 Controls, Start-Up, Operation And Troubleshooting page 55

CONNECTION LA-
PIN NUMBER
BEL
7
6
DDC
5
T'STAT
4
3
1,2
ECON
3,4
3
CLO1/
4,5
COMP1
6
2
3
CLO2/
4,5
COMP2
6
7
HPS
CIRCUIT 1
LPS
HPS
CIRCUIT 2
LPS
2
3
4
5
6
CONTRL
BOARD
7
8
9
10
11
1
2
PMR
3
REMOTE
SHUTDOWN
SMOKE
UNIT
SHUTDOWN
SHUTDOWN
24V OUT
C
R Spades
C Spades
The References above for T1J1 through T1J9 are to show the path of transformer 1 as is goes through the board and safety devices.
Table 20 – Central Terminal Board (CTB) Connections
POINT DESCRIPTION
Cool 1 Call
Cool 2 Call
Heat Stage 1 Call
Heat Stage 2 Call
IGC Fan Input
Cool 1 Call jumper
Cool 2 Call jumper
Comp 1 Contactor Common
Comp 1 jumper
Comp 1 Contactor Signal
Loader Common
OFMC Common
Loader jumper
Loader Contactor Signal
ODF High Speed Signal
Comp 1 High Pressure Switch
Comp 1 jumper
Loader jumper
Loader jumper
Heat Stage 2 Call
Heat Stage 1 Call
IGC Common/Ground
Transformer 1 Common/Ground
IGC Call for Indoor fan
IGC Call for Indoor fan/Fan feedback
IGC power (T1J9)
Transformer 1 Power (T1J1)
Limit Switch signal (T1J9)
Limit Switch source (T1J8)
Ground
Phase Monitor Source (T1J6)
Phase Monitor Normally Closed Signal (T1J7)
Remote Disable Switch if installed (T1J4 and T1J5)
Normally Closed Smoke Detector Contact (T1J3)
Smoke Detector Controller Power (T1J2)
Smoke Detector Controller Common
Transformer 1 Power after Safety Chain (T1J9)
Ground
24Vac FROM
MBB
MBB
MBB
MBB
MBB
DDC T'STAT
DDC T'STAT
CTB C
ECON
CIRCUIT 1 HPS
CTB C
CTB C
ECON
CIRCUIT 2 HPS
ECON
CIRCUIT 1 LPS
CLO1/COMP1
CIRCUIT 2 LPS
CLO2/COMP2
DDC T'STAT
DDC T'STAT
CTB C
TRAN1 Common
IGC IFO
CONTL BOARD
CTB R
TRAN1 24Vac
LSM
PMR
CTB C
UNIT SHUTDOWN
PMR Device
SMOKE SHUTDOWN
Smoke Detector
CONTL BOARD
CTB C
CONTL BOARD
CONTL BOARD
55
24Vac TO
ECON
ECON
CONTL BOARD
CONTL BOARD
CONTL BOARD
CLO1/COMP1
CLO2/COMP2
C1 --- Coil
CIRCUIT 1 LPS
C1 --- Coil
Comp. Loader
OFMC --- BRN
CIRCUIT 2 LPS
Comp. Loader
OFMC --- YEL
CLO1/COMP1
CIRCUIT 1 HPS
CLO2/COMP2
CIRCUIT 2 HPS
Gas Valve or PL3
IGC--- W or PL3
IGC C
CTB C
CONTL BOARD
MBB
IGC R
UNIT SHUTDOWN
CTB R
Fan overload
PMR Device
PMR Device
CONTL BOARD
PMR
REMOTE SHUTDOWN
Smoke Detector
Smoke Detector