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Y/Y2 Connection for the Y signal or high speed (Y2) signal
from the thermostat.
G
Connection for the G (fan) signal is energized from
the thermostat, 'HUM2' and AUX2' terminals are
energized when G energized.
O
Connection for the 'O' signal from the thermostat.
C
Connection for the C terminal to the thermostat (24V
common) also common to SEC1, HUM1, AUX1.
Figure 4 : Thermostat wiring, single stage A/C –
Variable speed ECM motor
THERMOSTAT
HEAT STAGE 2
O/W
Y1/W
N/
HEAT STAGE 1
W/W
Y/Y
COOL STAGE
G
24 VAC HOT
R
DHU
DEHUMIDIF
C
24 VAC
HU
HUMIDIF
B
N/
S1
OUTDOO
S2
DCAH
W
DO NOT REMOVE
Y
J2
W
Y
Y/Y
G
R
O
D
C
C
HUMIDIFIE
(24
OUTDOO
SENSO
Figure 5 : Thermostat wiring, two-stage A/C – Variable
speed ECM motor
THERMOSTAT
HEAT STAGE 2
O/W
HEAT STAGE 1
W/W
Y1/W
COOL STAGE
COOL STAGE
Y/Y
G
24 VAC HOT
R
DHU
DEHUMIDIF
C
24 VAC
HU
HUMIDIF
B
N/
S1
OUTDOO
S2
2.7
SUPPLY AIR ADJUSTMENTS AND
OTHER BLOWER SETTINGS
Fan Control Board taps are used by the installer to configure
a system. The ECM motor uses the selected taps to modify
its operation to a pre-programmed table of airflows (Refer to
Table 2). Airflows are based on system size or mode of
operation and those airflows are modified in response to
thermostat inputs.
The DCAHV must be configured to operate properly with
system components with which it is installed.
successfully configure a basic system move the 6 select
wires to the pins which match the components used or
desired operation. (Refer to Figure 6 below)
Figure 6 : Fan Control Board
LOW VOLTAGE TERMINAL BLOCK
5 AMP FUSE
SEC1
AUX HEAT KW/CFM
A
A
VIO
AC/HP SIZE
A
B
BLU
SYSTEM TYPE
AC
C
ORN
AC/HP CFM ADJUST
NOM
D
BLK
ON/OFF DELAY
E
WHT
CONTINUOUS FAN
LO
F
YEL
CEBD430226-01B CESS430226-01B
MOLEX 12-PIN CONNECTOR
6
DCAH
W
DO NOT REMOVE
J2
W
Y
Y/Y
G
R
O
D
C
HUMIDIFIE
(24
OUTDOO
SENSO
SEC2
B
C
D
J1
Dh
B
C
D
R
W
1
W
HP-EFF
2
HP-COMFORT
Y
1
Y/Y
G
HI
LO
O
C
J2
ENH
AUX1
HUM1
MED
HI
YEL
AUX2
HUM2
24VAC
30
0
90
0
GRY
HEATER/MOTOR
Y
Y
R
C
To
2
J2 JUMPER
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