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PART NO. 537981-03
WIRING DIAGRAM - ELECTRIC HEAT
SEQ
SEQ
RED
WHT
BLK
WHT
BLU
BLU
6
5
4
3
2
1
SEQ
SEQ
RED
WHT
BLK
WHT
BLU
BLU
6
5
4
3
2
1
BLK
SEQ
RED
WHT
WHT
BLU
6
5
4
3
2
1
RED
WHT
BLU
6
5
4
3
2
1
2
1
18 BLU
18 BLU
COM
C
208V
TRANSFORMER
24
240V
18 RED
14 YEL
18 GREEN
C
1
18 BLU
14 BLK
18 BRN
L
2
18 YEL
MTR
GND
14 GREEN
3
G
18 WHT
4
14 YEL
N
18 BLK
5
FIGURE 15. Typical Wiring Diagram – CBA25UHE Air Handler with Electric Heat – CT
BLK
BLK
YEL
YEL
SEQ
BLK
BLK
YEL
SEQ
BLU
BLK
BLU
HTR 4
SEC L
CB
L2
L1
L2
L1
BLK
BLK
YEL
YEL
SEQ
BLK
YEL
HTR3
BLU
SEC L
CB
L2
L1
L2
HTR3
PRI LS
L1
7.5KW & 10KW
BLK
BLK
SEQ
YEL
YEL
HTR1
SEC L
HTR2
BLU
SEC L
CB OR TB
HTR1
HTR2
L1
L2
PRI LS
PRI LS
4KW & 5KW
SEQ
BLK
YEL
HTR 1
CB OR TB
HTR 1
4
5
6
6-PIN CAP
W2 W1
G
O
R
DS C
TO THERMOSTAT BY OTHERS
Page 15
YEL
HTR 3
HTR 2
HTR 1
SEC L
SEC L
SEC L
HTR 4
HTR 3
HTR 2
PRI LS
PRI LS
PRI LS
12.5KW & 15KW
HTR2
HTR1
SEC L
SEC L
HTR1
HTR2
PRI LS
PRI LS
PRI LS
PRI LS
HEATERS USED
5 KW = HTR1
7.5 & 10 KW = HTR1 & HTR2
15 KW = HTR1,HTR2 & HTR3
20 KW = HTR1,HTR2,HTR3 & HTR4
TB = TERMINAL BLOCK
CB = CIRCUIT BREAKER
SEQ = SEQUENCER
GND = GROUND LUG
PRI LS= LIMIT SWITCH
SEC L= LIMIT SWITCH
HTR = HEATER ELEMENT
POWER (FACTORY WIRED)
POWER (FIELD WIRED)
CONTROL (FACTORY WIRED)
CONTROL (FIELD WIRED)
CONTROL CIRCUIT WIRING TO
BE 24 VOLT, N.E.C. CLASS 2
THREE POLE SEQUENCER
TIMING - SEC
PLUG PIN
ON
LOCATION
1-20
20-60
20-60
TWO POLE SEQUENCER
TIMING - SEC
ON
30-90
30-90
TD = TIME DELAY (OPT.)
**
TR = TRANSFORMER
BR = BLOWER RELAY
MTR = BLOWER MOTOR
CAP = MOTOR CAPACITOR
GND = GROUND
CONNECTION
WIRING DIAGRAM: NO HEAT
WIRE NUTS
BY
OTHERS
L1
L2 OR
NEUT.
1
2
Y1
Y2
6-PIN
GND
PLUG
Cut size: 7" Wide x 9-1/2" Tall
20KW
HTR 1
PRI LS
OFF
40-110
1-30
1-30
OFF
1-30
1-30
15 AMP
SUPPLY
VOLTAGE
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