Carrier 38AUQ 25 Series Installation, Start-Up And Service Instructions Manual page 26

Table 12 — 38AUQ Defrost Board I/O and Jumper Configurations
POINT NAME
INPUTS
G Fan
Y1 Cool 1
W1 Heat 1
R Power
C Common
DFT1 Defrost Switch
DFT2 Defrost Switch
OUTPUTS
OF OD Fan
RVS1
RVS2
COMP 1
TB-W2
CONFIGURATION
Select Jumper
1 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 DFT2 is open.
TYPE OF I/O CONNECTION PIN NO.
DI, 24-vac
DI, 24-vac
DI, 24-vac
24-vac
24-vac, ground
DI, 24-vac DFT-1 to DFT-1
DI, 24-vac DFT-2 to DFT-2
DO, 24-vac
DO, 24-vac
DO, 24-vac
DO, 24-vac
DO, 24-vac
24-vac
24-vac
Fig. 25 — Defrost Control Board (DFB) Location
UNIT CONNECTION
P2-3
P2-5
P2-7
P3-1
P3-3
OF
P3-7 to P3-5
P3-6 to P3-4
P3-10
E-HEAT
P1-1
P1-2
JMP17
JMP18
26
a
Not used
TB-Y1
TB-W1
TRAN2
TRAN2
DFB
DFB
OFR
RVS1 Energize in COOL
RVS2 Energize in COOL
CADM1-Y
HR
NOTE