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POINT NAMES
INPUTS
G Fan
Y1 Cool 1
W1 Heat 1
Y2 Cool 2
R Power
C Common
DFT1 Defrost Switch
DFT Jumper
OUTPUTS
OF OD Fan
RVS1
COMP 1
TB-W2
COMP 2 / SecondStage
CONFIGURATION
Select Jumper
1 Compressor
2 Compressor
SPEED-UP CONFIGURATION
Speed-Up Jumper
Speed-Up Jumper
NOTE(S):
a. Jumper for 1-3 secs: Factory Test, defrost runs for 12 seconds or less.
Jumper for 5-20 secs: Forced Defrost, defrost runs for 30 secs if DFT1 is open
Table 15 — DFB Power: 24-V at Pin P3-1, COM at P3-3 (required in all modes)
INPUTS AND
PIN
OUTPUTS
INPUTS
Y1
P2-5
W1
P2-7
DFT
DFT1-DFT1
OUTPUTS
OD Fans
OF
Rev Valve
P3-7
Compressor
P3-10
Electric Heat
E-HEAT
W2
NOTE(S):
a. Single Circuit, two stage units are configured as two compressor unit on the defrost board.
b. DFT may be OPEN or CLOSED during Heat mode operation, depending on outdoor coil temperature. Defrost mode cannot start until Time window opens in DFB Defrost
mode logic.
c. Call for electric heat may originate at the space thermostat (space demand) or at the DFB during Defrost. Thermostat signal will also be present on 575J unit's W2 terminal
and the DFB's E-HEAT terminal.
Table 14 — 575J Defrost Board I/O and Jumper Configurations
CONNECTION PIN
TYPE OF I/O
DI, 24-vac
DI, 24-vac
DI, 24-vac
DI, 24-vac
24-vac
24-vac, ground
DI, 24-vac
DI, 24-vac
DO, 24-vac
DO, 24-vac
DO, 24-vac
DO, 24-vac
DO, 24-vac
24-vac
24-vac
24-vac
COOL
OFF After COOL
24-V
0-V
0-V
0-V
OPEN
OPEN
24-V
0-V
24-V
24-V
24-V
0-V
0-V
0-V
0-V
0-V
Fig. 27 — Defrost Control Board (DFB) Location
UNIT CONNECTION
NUMBER
P2-3
P2-5
P2-7
P2-4 TB-Y2
575J***G/H only
P3-1
P3-3
DFT-1 to DFT-1
DFT-1 to DFT-2
575J***G/H only
OF
P3-7 to P3-5
P3-10
E-HEAT
P3-8
CADM2-Y/CADM1-Y2
P1-1
P1-2
P1-3
JMP17
JMP18
MODE
HEAT-1
0-V
24-V
May be OPEN or
May be OPEN or
CLOSED
b
24-V
0-V
24-V
0-V
0-V
28
a
TB-Y1
TB-W1
TRAN2
TRAN2
DFB
OFR
RVS1
Energize in COOL
CADM1-Y
HC-1 (TB4-1)
575J***G/H only
575J***G/H only
a
OFF After
HEAT-2
HEAT-1
0-V
0-V
24-V
0-V
May be OPEN or
CLOSED
CLOSED
b
b
24-V
0-V
0-V
0-V
24-V
0-V
0-V
0-V
c
24-V
0-V
NOTE
Not used
DEFROST
During HEAT
0-V
24-V
CLOSED
0-V
24-V
24-V
24-V
0 or 24-V
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