Carrier WeatherMaker 50KCQ A04 Series Installation Instructions Manual page 23

POINT NAME
G Fan
Y1 Cool 1
Y2 Cool 2
W1 Heat 1
W2 Heat 2
R Power
C Common
DFT1
DFT2
IFO Fan On
OF OD Fan On
RVS1
RVS2
COMP 1
COMP 2
HEAT 2
COM
Select Jumper
Speed-Up Jumper
Speed-Up Jumper
SWITCH NO.
1 2
1
 
0
90 minutes
Auxiliary (Electric) Heat Control
The 50KCQ unit can be equipped with one or two auxiliary
electric heaters, to provide a second stage of heating. The DFB
will energize this Heating System for a Stage 2 Heating Com-
mand (heaters operate concurrently with compressor(s) in the
Stage 1 Heating cycle), for an Emergency Heating sequence
(compressors are off and only the electric heaters are ener-
gized) and also during the Defrost cycle (to eliminate a "cold
blow" condition in the space).
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 provid-
ed by Defrost Thermostat 1 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 cy-
cle) 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. 38 and Table 7). The de-
fault run periods are 60 minutes for unit sizes 04-06.
Table 6 — 50KCQ Defrost Board I/O and Jumper Configurations
TYPE OF I/O
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
SPEED-UP CONFIGURATION
Table 7 — Dip Switch Position
1 2

1

0
60 minutes
CONNECTION
UNIT CONNECTION
PIN NUMBER
INPUTS
P2-3
P2-5
P2-4
P2-7
P2-6
P3-1
P3-2
DFT-1 to DFT-1
DFT-2 to DFT-2
OUTPUTS
P3-9
OF
P3-7 to P3-5
P3-6 to P3-4
P3-10
P3-8
E-HEAT
P3-3
CONFIGURATION
P1-1
JMP17
JMP18
1 2

1 1

0 0
30 minutes
Fig. 38 — DIP Switch Settings - Defrost Board
At the end of the continuous run period, the defrost control will
test for a need to defrost. On unit sizes 04-06 (single compres-
sor designs), DFT1 controls the start and termination of the de-
frost cycle. If DFT1 is still open, the defrost test/run window is
closed and the control repeats the continuous run period. If
DFT1 is closed, the defrost cycle is initiated. The defrost peri-
od will end when DFT1 opens (indicating the outdoor coil has
been cleared of frost and ice) or a 10 minute elapsed period ex-
pires, whichever comes first.
23
CTB-G
CTB-Y1
CTB-Y2
CTB-W1
CTB-W2
CONTL BRD-8
CONTL BRD-4
REHEAT
OFR
Energize in COOL
Energize in COOL
FPT-REHEAT-6
REHEAT-8
HC-1 (TB4-1)
HC-1 (TB4-3)
1 2
 
1
0
120 minutes Fan Delay
NOTE
3
On
Off