Nortron B SERIES Installation And Operating Instructions Manual - page 7
WIRING DIAGRAMS
10 KW - 240
V
O
L
T
S
-
S
INGLE PHA
S
E
15 KW - 240
V
O
L
T
S
-
S
INGLE PHA
S
E
NC
NC
NO
NO
24V
240V
24V
24V
NC
NC
NC
NO
COM
NO
NO
18-20 KW - 240
V
O
L
T
S
-
S
INGLE PHA
S
E
NC
NC
NC
COM
NO
NO
CONNECT 24
V
R
OOM
THERMO
S
T
A
T BETWEEN
R
A
N
D
W
1
.
U
S
E ONLY CLA
SS
1 WIRING
IN
S
IDE FURNACE COMPARTMENT
S
.
LEGEND
L
S
E
LC
FR
24V
M
24V
ORANGE
BLUE
RED
YELLOW
BLACK
1
3
5
6
2
4
TR
L1
L1
L2
N
L2
L2
C
G
R
W1
W2
L1
L1
M1
M2
M4
M
3
L1
24V
TR
L1
L2
N
C
G
R
W1
W2
L2
L2
L2
24V
24V
L1
M1
M2
M5
M6
M1
M2
M4
M
3
L1
L1
L2
3
3
1
1
4
4
6
5
2
2
5
L1
L2
M
ORANGE
BLUE
RED
YELLOW
BLACK
R
L1
L
S
R2
EL
C
R1
FRX
FR
240V
24V
24V
NO
24V
TR
L1
L2
N
C
G
R
W1
W2
L2
L2
L2
24V
24V
L1
M
3
M4
M5
M6
M1
M2
M4
M
3
L1
L1
L2
3
3
1
1
4
4
6
5
2
2
5
L1
L2
C
M
ORANGE
BLUE
RED
YELLOW
L1
L
S
R2
R1
FRX
FR
BLACK
L2
EL
C
M1
M2
L1
L
MRHTL
MRHTL
MRHTL
MRHTL
SS
R
W2
L
C
W1
MRHTL
MRHTL
SS
R
W2
L
C
W1
27
KW - 240
V
O
L
T
S
-
S
INGLE PHA
S
E
NO
W
ARNING:
These models are not certified to run continuously in low speed (red wire) as it will cause
overheating conditions. DO NOT
reconnect red wire into dif
ferent terminal.
W
ARNING:
These models are not certified to run continuously in low speed (red wire) or in med-low speed
(yellow wire) as it will cause overheating conditions. DO NOT
reconnect red wire into dif
ferent
terminal and DO NOT
connect yellow wire.
NC
NC
NC
COM
NO
NO
240V
24V
TR
L1
L2
N
M
3
M4
M5
M6
M1
M2
M4
M
3
C
M
M1
M2
L2
L2
L2
L2
L2
C
G
R
W1
W2
24V
24V
24V
L1
L1
L1
L1
L1
4
3
1
6
5
2
3
1
4
2
5
L
S
L1
24V
FR
FRX
ORANGE
BLUE
RED
YELLOW
BLACK
L1
L2
R1
R2
A1
A2
24-25 KW
-
240
V
O
L
T
S
-
S
INGLE PHA
S
E
EL
C
NC
NC
NC
COM
NO
NO
240V
24V
TR
L1
L2
N
M
3
M4
M5
M6
M1
M2
M4
M
3
C
M
M1
M2
L2
L2
L2
L2
L2
C
G
R
W1
W2
24V
24V
24V
L1
L1
L1
L1
L1
4
3
1
6
5
2
3
1
4
2
5
L
S
L1
24V
FR
FRX
ORANGE
BLUE
RED
YELLOW
BLACK
L1
L2
R1
R2
A1
A2
EL
C
24V
M1
M2
R3
L2
SS
R
W2
L
C
W1
MRHTL
MRHTL
SS
R
W2
L
C
W1
Open 9
3
.3
°C (200°F)
Open 9
3
.3
°C (200°F)
MRHTL
MRHTL
Open 9
3
.3
°C (200°F)
Open 9
3
.3
°C (200°F)
Open 9
3
.3
°C (200°F)
C
E
FR
FRX
L
LC
M
R
SS
L
S
TR
COM
NC
NO
CAPACITOR
ELEMENT
FAN RELAY - 24
FAN RELAY - 240
LIGHT
AUTOMATIC LIMIT
MOTOR
TIME DELAY RELAY
S
EA
S
ON
S
ELECT
LOW
S
PEED
TRAN
S
FORMER
COMMON
NORMALLY CLO
S
ED
NORMALLY OPEN
S
UBJECT TO CHANGE WITHOUT NOTICE.
NO
C
W
ARNING:
These models are not certified to run continuously in low speed
(red wire) as it will cause overheating conditions.
DO NOT
reconnect red wire into dif
ferent terminal.
FAN MOTOR
S
PEED
HI
MED - HIGH
MED - LOW
LOW
BLACK
BLUE
YELLOW
RED
COLOR
7
WARNING
Risk of electrical shock. Disconnect power before installation, servicing, maintenance or field wiring. Replace all panels before
operating. Failure to do so can result in electrical shock causing severe injuries or death.
!