516 01 3604 04
Specifications subject to change without notice.
21
Fig. 36 — Defrost Control Board Location
NOTES:
1. Jumper for 1-3 seconds: Factory Test — The defrost interval timing is reduced by a factor of 0.1 seconds/minute based on the positions of DIP
switches SW1 and SW2 (i.e. 90 minutes will be reduced to 9 seconds).
2. Jumper for 5-20 seconds: Forced Defrost — Defrost runs for 30 seconds if DFT2 is open.
Table 6 —
RHH Defrost Board I/O and Jumper Configurations
POINT NAME
TYPE OF I/O
CONNECTION PIN NUMBER
UNIT CONNECTION
NOTE
INPUTS
G Fan
DI, 24 vac
P2-3
CTB-G
Y1 Cool 1
DI, 24 vac
P2-5
CTB-Y1
Y2 Cool 2
DI, 24 vac
P2-4
CTB-Y2
W1 Heat 1
DI, 24 vac
P2-7
CTB-W1
W2 Heat 2
DI, 24 vac
P2-6
CTB-W2
R Power
24 vac
P3-1
CONTL BRD-8
C Common
24 vac
P3-2
CONTL BRD-4
DFT 1
DI, 24 vac
DFT-1 to DFT-1
—
DFT 2
DI, 24 vac
DFT-2 to DFT-2
—
OUTPUTS
IFO Fan On
DO, 24 vac
P3-9
REHEAT/HP-2
OF OD Fan On
DO, 24 vac
OF
OFR
RVS1
DO, 24 vac
P3-7 to P3-5
—
Energize in COOL
RVS2
DO, 24 vac
P3-6 to P3-4
—
Energize in COOL
COMP 1
DO, 24 vac
P3-10
FPT1-REHEAT/HP-6
COMP2
DO, 24 vac
P3-8
FPT2-REHEAT/HP-8
HEAT 2
DO, 24 vac
E-HEAT
TB4-1
COM
24 vac
P3-3
TB4-3
CONFIGURATION
Select Jumper
24 vac
P1-1
—
2 Compressor
24 vac
P1-3
—
Use for RHS
SPEED-UP CONFIGURATION
Speed-Up Jumper
—
JMP17
—
Speed-Up Jumper
—
JMP18
—
Table 7 —
DIP Switch Positions
1
2
1
2
1
2
1
2
3
1
•
1
•
1
1
•
•
1
•
On
0
•
0
•
0
•
•
0
0
Off
30 minutes
60 minutes
(factory default)
90 minutes
120 minutes
Fan Delay
