035-19946-001 Rev. B (0804)
6
Unitary Products Group
CFM SELECTION BOARD SETTINGS
For proper system operation the CFM Selection Board jumpers must be
set properly.
Refer to the Tabular Data Sheet for the recommended air flow settings
for each size condensing unit.
Set the cooling speed per the instructions for the air handler or furnace
by selecting the correct COOL and ADJ taps. Verify the airflow using
the LED display on the CFM selection board.
The HUMIDISTAT jumper must also be removed if a dehumidistat is
installed.
FIGURE 6:
Typical Air Handler Thermostat Wiring
VARIABLE
SPEED
AIR HANDLER
AIR
CONDITIONER
C
Y
R
W
G
C
Y
R
O
CONTACTOR
COIL
CONTACTOR
COIL
Y1
W2
W1
G
HUM
Y2
X/L
X/L
1
2
1
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
HUMIDISTAT JUMPER ON CFM SELECTION BOARD MUST BE REMOVED.
2
Y1, Y2, X/L, AND HUM LOCATED ON CFM SELECTION BOARD.
THERMOSTAT
FIGURE 7:
Typical Furnace Thermostat Wiring
1
VARIABLE
SPEED
FURNACE
C
Y
R
W
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
HUMIDISTAT JUMPER ON CFM SELECTION BOARD
MUST BE REMOVED.
G
C
Y
R
O
Y1
W2
W1
G
HUM
Y2
X/L
1
THERMOSTAT
AIR
CONDITIONER
CONTACTOR
COIL
CONTACTOR
COIL
FIGURE 8:
Typical Field Wiring (Air Handler / Electrical Heat)
ALL FIELD WIRING TO BE IN ACCORDANCE WITH ELECTRIC CODE (NEC) AND/OR LOCAL CODES
POWER WIRING
208/230-1-60
CONTACTOR
TERMINALS
COIL
GND.
LUG
C
Y
R
G
W
Y
R
G
W
POWER WIRING
CONTROL WIRING
FACTORY WIRING
24 VOLT CONTROL WIRING
MINIMUM 18 GA. WIRE
(NEC CLASS 2)
FURNACE OR AIR HANDLER TERMINAL BLOCK
ROOM THERMOSTAT
CONDENSING UNIT
ALL OUTDOOR WIRING MUST BE WEATHERPROOF. USE COPPER CONDUCTORS ONLY.
TERMINAL W IS ONLY
REQUIRED ON SYSTEMS
WITH HEAT.
*
*
FIGURE 9:
CFM Selection Board
CFM SELECTION BOARD
TAP SELECTION
D
C
B
A
D
C
B
A
COOL
HEAT
ADJ
DELAY
REMOVE FOR
HEAT PUMP
HUMIDISTAT