Carrier WeatherMaker 50FCQ 14 Series Installation Instructions Manual page 18

Fig. 34 — Defrost Control Board Location - 50FCQ 14 Electro-Mechanical Unit Shown
POINT NAME
INPUTS
G Fan
Y1 Cool 1
Y2 Cool 2
W1 Heat 1
W2 Heat 2
R Power
C Common
DFT 1
DFT 2
OUTPUTS
IFO Fan On
OF OD Fan On
RVS1
RVS2
COMP 1
COMP2
HEAT 2
COM
CONFIGURATION
Select Jumper
SPEED-UP CONFIGURATION
Speed-Up Jumper
Speed-Up Jumper
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.
Defrost
The defrost control mode is a time/temperature sequence. There
are two time components: The continuous run period and the
test/defrost cycle period. The temperature component is provided
by Defrost Thermostat and (DFT2) mounted on the outdoor coil.
The continuous run period is a fixed time period between the end
of the last defrost cycle (or start of the current Heating cycle)
during which no defrost will be permitted. This period can be set
at 30, 60, 90 or 120 minutes by changing the positions of DIP
switches SW1 and SW2 (see Fig. 35 and Table 4). The default run
period is 60 minutes.
1 2
1 •
0 •
30 minutes
Table 3 — 50FCQ Defrost Board I/O and Jumper Configurations
TYPE OF I/O CONNECTION PIN NUMBER
DI, 24 vac
DI, 24 vac
DI, 24 vac
DI, 24 vac
DI, 24 vac
24 vac
24 vac
DI, 24 vac
DI, 24 vac
DO, 24 vac
DO, 24 vac
DO, 24 vac
DO, 24 vac
DO, 24 vac
DO, 24 vac
DO, 24 vac
24 vac
24 vac
—
—
Table 4 — DIP Switch Positions
1 2
1 •
0 •
60 minutes
(factory default)
P2-3
P2-5
P2-4
P2-7
P2-6
P3-1
P3-2
DFT-1 to DFT-1
DFT-2 to DFT-2
P3-9
OF
P3-7 to P3-5
P3-6 to P3-4
P3-10
P3-8
E-HEAT
P3-3
P1-1
JMP17
JMP18
Fig. 35 — DIP Switch Settings - Defrost Board
1 2
1 1
0 • • 0
90 minutes
18
UNIT CONNECTION
CTB-G
CTB-Y1
CTB-Y2
CTB-W1
CTB-W2
CONTL BRD-8
CONTL BRD-4
—
SWITCH
REHEAT/HP-2
OFR
— Energize in COOL
— Energize in COOL
FPT1-REHEAT/HP-6
FPT2-REHEAT/HP-8
TB4-1
TB4-3
—
—
—
1 2
• • 1
0
120 minutes
NOTE
3
• On
Off
Fan Delay