WIRING DIAGRAMS
218 Rev. 3
TO AVO ID POSSIBLE ELECTRICAL SHO CK, PERSONAL INJURY,
OR DEATH, DISCO NNECT THE POW ER BEFORE SERVICING .
WARNING
BBC36-48-60A2A
MIB
L2
L1
L2
L1
TRANSFORMER
COM
208
240
R
C
G
O
W2
E
Y
L
O
G
I
C
THERMISTOR
CONTROL
BOARD
INTERFACE
BOARD
RC
K1
PWM
CONTROL
WIRING
TO MIB
FAN
FAN COM
9
6
PIN POSITIONING FOR AIRFLOW
SELECTION (BBC36A2A)
ACTUAL
TONNAGE
SETTING
NOMINAL
COOLING
(CFM)
TONNAGE
TAP
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
1 1/2
2
2 1/2
3
600
800
1000
1200
PIN POSITIONING FOR AIRFLOW
SELECTION (BBC60A2A)
ACTUAL
TONNAGE
SETTING
NOMINAL
COOLING
(CFM)
TONNAGE
TAP
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
5
4
3 1/2
3
1800
1600
1400
1200
NOTE: THE TABLE 1 & TABLE 2 TAPS ARE TO
REMAIN ON FACTORY SETTING "A". NO
FURTHER ADJUSTMENT TO THESE TAPS
IS REQUIRED FOR PROPER OPERATION
OF THE UNIT. THE "TABLE SELECT" PIN
SELECTOR MUST REMAIN ON FACTORY
SETTING "TONNAGE".
NOTE: UNIT IS FACTORY SHIPPED TO PRO-
VIDE 50%OF NOMINAL COOLING CFM IN
FAN ONLY MODE. FOR 100% OF NOM-
INAL COOLING CFM, MOVE JUMPER ON
2 PIN SELECTOR "LOW SPEED MAN FAN"
TO COVER ONLY ONE PIN.
NOTE: WHEN ELECTRIC HEAT IS FIELD ADD-
ED, USE WIRE NUTS PROVIDED WITH
WIRE NUTS PROVIDED WITH HEATER KIT
AND LOCATE THE REPLACEMENT WIRING
DIAGRAM UPON THIS DIAGRAM.
PIN POSITIONING FOR AIRFLOW
SELECTION (BBC36A2A)
ACTUAL
TONNAGE
SETTING
NOMINAL
COOLING
(CFM)
TONNAGE
TAP
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
1 1/2
2
2 1/2
3
600
800
1000
1200
11139902 REV. 0
FACTORY SUPPLIED WIRING
FIELD SUPPLIED WIRING
LOW VOLTAGE
HIGH VOLTAGE
COLOR
CODE:
1ST GROUP-COLOR
2ND GROUP-NUMBER
LOW VOLTAGE
HIGH VOLTAGE
BLACK-BK
BLUE-BU
RED-RD
TAN-TN
GRAY-GY
ORANGE-OR
GREEN-GN
YELLOW-YL
VIOLET-VT
BROWN-BR
WN-WIRE NUT TH-THERMISTOR
CAP-CAPACITOR
MIB-MOTOR INDOOR BLOWER
MIB
R
C
Y
E
O
G
W2
C
R
LED
L1
L2
UNUSED
FAN
COM
FAN
TH
FIELD
CONNECTION
208/240
VAC 1
L1
L2
GND
2
WARNING: DISCONNECT POWER BEFORE SERVICING.
WN
WN
1
1
2 UNIT MUST BE PROPERLY GROUNDED.
USE COPPER CONDUCTORS ONLY,
SUITABLE FOR MINIMUM 75C.
RD6
BK9
YL7
YL7
BU
YL
OR
RD
BK
MIB
L2
L1
L2
L1
TRANSFORMER
COM
208
240
R
C
G
O
W2
E
Y
L
O
G
I
C
THERMISTOR
10
11
12
9
8
7
6
5
4
3
2
1
12 PIN
CONNECTOR
CONTROL
BOARD
THERM
CONTROL BOARD MALFUNCTION
CONTINUOUS
NONE
6 FLASHES
SYSTEM ERROR
3 SECONDS
THERMISTOR ERROR
THERMISTOR AND/OR BOARD ERROR
NORMAL OPERATION
MODE
4 FLASHES
2 FLASHES
1/2 SECOND ON
LED ON TIME
CONTROL BOARD LED FLASH CODE
3 SECONDS
3 SECONDS
1/2 SECOND OFF
LED OFF TIME
3
3A FUSE MAX
3
TRANSFORMER
208
240
COM
INTERFACE
BOARD
RC
K1
PWM
CONTROL
WIRING
TO MIB
FAN
FAN COM
RC
K1
PWM
6
5
4
3
2
1
INTERFACE
BOARD
SEE
HARNESS
DETAIL
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
BK1
TN2
BK3
BR4
YL5
VT7
YL8
WH10
OR11
BU12
RD13
GY15
YL16
HARNESS DETAIL
MIB
INTER-
FACE
BOARD
BU2
VT5
RD1
BK4
OR6
GY3
9
6
BK1
RD1
F + -
T
O
N
A
D
J
T
B
L
1
T
B
L
2
STAT
4
NO. OF BLINKS X 100=OPERATING
CFM
4
PIN POSITIONING FOR AIRFLOW
SELECTION (BBC48A2A)
ACTUAL
TONNAGE
SETTING
NOMINAL
COOLING
(CFM)
TONNAGE
TAP
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
2 1/2
3
3 1/2
4
1000
1200
1400
1600
PIN POSITIONING FOR AIRFLOW
SELECTION (BBC60A2A)
ACTUAL
TONNAGE
SETTING
NOMINAL
COOLING
(CFM)
TONNAGE
TAP
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
5
4
3 1/2
3
1800
1600
1400
1200
5
FIELD LOW VOLTAGE CONNECTIONS
PER INSTALLATION INSTRUCTIONS
5
A B C
D
A B C
D
A B C
D
N
O
T
L
B
T
L
B
T
1 2
L1
L2
LOW SPEED
MAN FAN
S
L
C
T
T
B
L