40
18-CD37D1-2-EN
Installer’s Guide
BLK/TWIN W2 W1 R
G
B
Y YLO
O
BLK/TWIN
BK JUMPER
W14
W2 W1 R
G
B
Y YLO
O
OFF
1
2
1
2
ON
HUMIDISTAT HOOKUP
If an optional Humidistat is to be connected between “R”
and “BK”, the factory installed jumper between “R” and “BK” on
the circuit board must be cut. If an optional Humidistat is used,
the jumper must also be cut when applying an airflow com-
mand signal to the “BK” input such as with the variable speed
single-zone and multi-zone system controller. On single speed
cooling only/ non-heat pump systems, jumper “Y” to “O” for
proper operation of the delay profiles and the Humidistat. For
two compressor or two speed systems, jumper “YLO” to “O”.
Figure 64
The factory installed jumper be-
tween “R” and “BK” on the circuit
board must be cut if an optional
Humidistat is installed.
Figure 65
OUTDOOR UNIT
(NO TRANSFORMER)
SEE
NOTE 6
SEE
NOTE 7
W14
R-BK
JUMPER
SEE NOTE 9
B/C
B
FIELD WIRING DIAGRAM FOR VARIABLE SPEED 2 STAGE FURNACE
2 STAGE HEATING, 2 STEP STAGED COOLING
(OUTDOOR SECTION WITHOUT TRANSFORMER)
TO 115 V 1 PH.,
60 HZ., POWER
SUPPLY PER
LOCAL CODES
HUM SEE
NOTE 5
EAC SEE
NOTE 5
