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Figure 17. Typical Wiring Diagram – NAMP1 Air Handler with Electric Heat – CT
507787G02 / 31-5000675-1
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
BLK
SEQ
RED
WHT
WHT
BLU
6
5
4
BLU
3
2
1
CB OR TB
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
BLK
BLK
YEL
YEL
SEQ
BLK
BLK
YEL
SEQ
BLU
YEL
BLK
BLU
HTR 4
SEC L
CB
L2
L1
L2
L1
HTR 4
PRI LS
BLK
BLK
YEL
YEL
SEQ
BLK
YEL
BLU
HTR3
SEC L
CB
L2
L1
L2
HTR3
PRI LS
L1
7.5KW & 10KW
BLK
YEL
YEL
HTR1
SEC L
HTR2
SEC L
HTR1
HTR2
L1
L2
PRI LS
PRI LS
SEQ
4KW & 5KW
BLK
YEL
HTR 1
CB OR TB
HTR 1
4
5
6
6-PIN CAP
W2 W1
R
DS C
G
O
Y1
Y2
TO THERMOSTAT BY OTHERS
CONSTANT TORQUE LABEL WIRING
Issue 2336
20KW
HTR 3
HTR 2
HTR 1
SEC L
SEC L
SEC L
HTR 3
HTR 2
HTR 1
PRI LS
PRI LS
PRI LS
12.5KW & 15KW
HTR1
HTR2
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
OFF
LOCATION
1-20
40-110
20-60
1-30
20-60
1-30
TWO POLE SEQUENCER
TIMING - SEC
ON
OFF
30-90
1-30
30-90
1-30
TD = TIME DELAY (OPT.)
**
TR = TRANSFORMER
MTR = BLOWER MOTOR
CAP = MOTOR CAPACITOR
GND = GROUND CONNECTION
WIRING DIAGRAM: NO HEAT
WIRE NUTS
BY
OTHERS
L1
15 AMP
L2 OR
SUPPLY
NEUT.
VOLTAGE
1
2
6-PIN
PLUG
GND
ELECTRIC HEAT
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