Carrier 50HCQA05 Service And Maintenance Instructions page 24

Inputs
Point Name
G Fan
Y1 Cool 1
Y2 Cool 2
W1 Heat 1
W2 Heat 2
R Power
C Common
DFT1
DFT 2
Outputs
Point Name
IFO Fan On
OF OD Fan On
RVS1
RVS2
COMP 1
COMP 2
HEAT 2
COM
Configuration
Point Name
Select Jumper
2 Compressor
Speed- - Up Configuration
Point Name
Speed --- Up Jumper
Speed --- Up Jumper
Jumper for 1- -3 seconds: Factory Test, defrost runs for 9 seconds
Jumper for 5- -20 seconds: Forced Defrost, defrost runs for 30 seconds if DFT2 is open
Reversing valve control — The DFB has two outputs for
unit reversing valve control. Operation of the reversing
valves is based on internal logic; this application does not
use an "O" or "B" signal to determine reversing valve
position. Reversing valves are energized during the
cooling stages and the defrost cycle and de- - energized
during heating cycles. Once energized at the start of a
cooling stage, the reversing valve will remain energized
until the next heating cycle demand is received. Once
de- - energized at the start of a Heating cycle, the reversing
valves will remain de- - energized until the next cooling
stage is initiated.
Fig. 33 - - Defrost Control Board Location
Table 8 – 50HCQ Defrost Board I/O and Jumper Configurations
Type of I/O Connection Pin Number
DI, 24Vac
DI, 24Vac
DI, 24Vac
DI, 24Vac
DI, 24Vac
24Vac
24Vac
DI, 24Vac DFT--- 1 to DFT--- 1
DI, 24Vac DFT--- 2 to DFT--- 2
Type of I/O Connection Pin Number
DO, 24Vac
DO, 24Vac
DO, 24Vac P3--- 7 to P3--- 5
DO, 24Vac P3--- 6 to P3--- 4
DO, 24Vac
DO, 24Vac
DO, 24Vac E--- HEAT
24Vac
Type of I/O Connection Pin Number
24Vac
24Vac
Type of I/O Connection Pin Number
Unit Connection
P2--- 3 LCTB--- G
P2--- 5 LCTB--- Y1
P2--- 4 LCTB--- Y2
P2--- 7 LCTB--- W1
P2--- 6 LCTB--- W2
P3--- 1 CONTL BRD--- 8
P3--- 2 CONTL BRD--- 4
Unit Connection
P3--- 9 REHEAT--- 2
OF
P3--- 10 FPT --- REHEAT--- 6
P3--- 8 REHEAT--- 8
HC --- 1 (TB4--- 1)
P3--- 3 HC --- 1 (TB4--- 3)
Unit Connection
P1--- 1
P1--- 3
Unit Connection
JMP17
JMP18
Compressor control — The DFB receives inputs
indicating Stage 1 Cooling, Stage 2 Cooling (sizes 08 - -
12) and Stage 1 Heating from the space thermostat or unit
control system (PremierLink or RTU- - OPEN); it
generates commands to start compressors with or without
reversing valve operation to produce Stage 1 Cooling (one
compressor), Stage 2 Cooling (both compressors run) or
Stage 1 Heating (both compressors run on 8- - 12 systems.
The 04- - 07 systems have only one compressor).
24
Note
Note
OFR
Energize in COOL
Energize in COOL
Note
Use for 50HCQD
Note
C09276