Carrier 48TC 07 - Central Terminal Board Jumpers; (48;50 Series Only)

20
Fig. 29 — ACS320 VFD Wiring
Fig. 30 — ACH550/580 VFD Wiring
Central Terminal Board Jumpers 
(48/50 Series Only)
The Central Terminal Board (CTB) is a large printed circuit board
that is located in the unit control box. This printed circuit board
contains multiple termination strips and connectors to simplify
factory control box wiring and field control connections. Termi-
nals are clearly marked on the board surface. See Fig. 31.
The CTB contains no software and no logic. But it does include
seven configuration jumpers that are cut to configure the board to
read external optional and accessory controls, including that the
unit is a heat pump. Table 14 lists the control functions of the
jumpers.
Jumpers JMP5, JMP6 and JMP7 are located in notches across the
top of the CTB (see Fig. 31). These jumpers are intact on units
with gas heat or electric heat. These jumpers are factory cut on all
heat pump units and on units with Humidi-MiZer
®
(reheat) system
option.
Factory-installed boards will have these jumpers factory-cut
where required. Service replacement boards have these jumpers
intact; servicer must cut these jumpers as indicated in Table 15
when installing a replacement board.
Fig. 31 — Central Terminal Board (CTB)
Table 12 — ACS320 VFD Terminal Designations
TERMINAL FUNCTION
U1
V1
W1
Three-Phase main circuit input power supply
U2
V2
W2
Three-Phase AC output to motor, 0V to maximum
input voltage level
10 (GND)
11 (COMMON)
Factory-supplied jumper
9 (24 VDC)
12 (DI-1)
Run (factory-supplied jumper)
9 (24 VDC)
15 (DI-4)
Start Enable 1 (factory-supplied jumper). When
opened, the drive goes to emergency stop
13 (DI-2)
14 (DI-3)
Factory wired for 24 Vdc input from Fan Speed
Board
Table 13 — ACH550/580 VFD Terminal Designations
TERMINAL FUNCTION
U1/L1
V1/L2
W1/L3
Three-Phase main circuit input power supply
U2 / T1/U
V2 / T2/V
W2 / T3/W
Three-Phase AC output to motor, 0V to maximum
input voltage level
11 (GND)
12 (COMMON)
Factory-supplied jumper
10 (24 VDC)
13 (DI-1)
Run (factory-supplied jumper)
10 (24 VDC)
16 (DI-4)
Start Enable 1 (factory-supplied jumper). When
opened, the drive goes to emergency stop
14 (DI-2)
15 (DI-3)
Factory wired for 24 Vdc input from Fan Speed
Board
ACS320 VFD TERMINAL STRIP
GND
DCOM 1
+24 V
DI-1 DI-2 DI-3 DI-4
9101112131415
PNK YEL WHT
ACH550/580ACH VFD TERMINAL STRIP
GND
DCOM 1
+24 V
DI-1 DI-2 DI-3 DI-4
10 11 12 13 14 15 16
PNK YEL WHT
Table 14 — CTB Jumpers
JUMPER CONTROL FUNCTION NOTE
JMP1 Phase Monitor
JMP2 Occupancy Control
JMP3
Smoke Detector
Shutdown
JMP4 Remote Shutdown
JMP5 Heat Pump/Reheat 50HCQ, TCQ default: Cut
JMP6 Heat Pump/Reheat 50HCQ, TCQ default: Cut
JMP7 Heat Pump/Reheat 50HCQ, TCQ default: Cut
Table 15 — Jumper Configuration
UNIT TYPE / MODEL
Configuration
Jumper
Gas Heat
48HC, TC
a
NOTE(S):
a. Unit without Humidi-MiZer (reheat) option.
Electric Heat
50 HC, TC
a
Heat Pump
50HCQ, TCQ
JMP5 Intact Intact Cut
JMP6 Intact Intact Cut
JMP7 Intact Intact Cut