22
C09276
Fig. 30 − Defrost Control Board Location
Table 5 – 50HCQ Defrost Board I/O and Jumper Configurations
Inputs
Point Name Type of I/O Connection Pin Number Unit Connection Note
G Fan DI, 24Vac P2-3 CTB-G
Y1 Cool 1 DI, 24Vac P2-5 CTB-Y1
Y2 Cool 2 DI, 24Vac P2-4 CTB-Y2
W1 Heat 1 DI, 24Vac P2-7 CTB-W1
W2 Heat 2 DI, 24Vac P2-6 CTB-W2
R Power 24Vac P3-1 CONTL BRD-8
C Common 24Vac P3-2 CONTL BRD-4
DFT1 DI, 24Vac DFT-1 to DFT-1
DFT 2 DI, 24Vac DFT-2 to DFT-2
Outputs
Point Name Type of I/O Connection Pin Number Unit Connection Note
IFO Fan On DO, 24Vac P3-9 REHEAT-2
OF OD Fan On DO, 24Vac OF OFR
RVS1 DO, 24Vac P3-7 to P3-5 Energize in COOL
RVS2 DO, 24Vac P3-6 to P3-4 Energize in COOL
COMP 1 DO, 24Vac P3-10 FPT - REHEAT-6
COMP 2 DO, 24Vac P3-8 REHEAT-8
HEAT 2 DO, 24Vac E-HEAT HC-1 (TB4-1)
COM 24Vac P3-3 HC-1 (TB4-3)
Configuration
Point Name Type of I/O Connection Pin Number Unit Connection Note
Select Jumper 24Vac P1-1
2 Compressor 24Vac P1-3 Use for 50HCQD
Speed−Up Configuration
Point Name Type of I/O Connection Pin Number Unit Connection Note
Speed-Up Jumper JMP17
Speed-Up Jumper JMP18
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
Table 6 – Dip Switch Position
Switch No.
1 2 1 2 1 2 1 2 3
1 1 J 1 J 1 J J 1 On
0 J J 0 J 0 J 0 0 J Off
90 minutes
60 minutes 30 minutes 120 minutes Fan Delay
50HCQ
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