Fig. 18—FK4B Wiring Diagram
A94078
LS
ICM
TRAN
GND
FU
RECP
CB
F
SEE RATING PLATE
FOR VOLTS & HERTZ
(SEE NOTE 1)
FIELD POWER WIRING
YEL
GND
30KW 1PH SCHEMATIC DIAGRAM
DISCONNECT PER NEC
THIS COMPARTMENT MUST BE CLOSED EXCEPT FOR SERVICING
NOT SUITABLE FOR USE ON SYSTEMS
EXCEEDING 150V TO GROUND
CAUTION:
ATTENTION:
NE CONVIENT PAS AUX INSTALLATIONS
DE PLUS DE 150 V A LA TERRE
BLOWER MOTOR
ROTATION
HVTB
SEQ 3
CB/FU4
FU6
YEL
YEL
YEL
L1
12
11
BLK
BLK
FU5
8
7
CB/FU2
CB/FU1
YEL
YEL
4
3
BLK
BLK
10
9
BLK
BLK
SEQ 2
6
5
YEL
2
1
BLK
CB/FU3
L2
HTR6
HTR5
HTR4
HTR3
HTR2
HTR1
LS6
LS5
LS4
LS3
LS2
LS1
BLK
SEQ 1
YEL
YEL
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLU
BLK
YEL
BLU
PLUG 1
RED
GRY
BRN
BRN
SEQ1
SEQ2
SEQ3
ORN
VIO
1
2
3
4
5
6
7
8
9
10
11
12
2
4
5
6
7
FIELD POWER WIRING
DISCONNECT PER NEC
SCHEMATIC DIAGRAM
SEE RATING PLATE
FOR VOLTS & HERTZ
(SEE NOTE 1)
YEL
BLK
9
7
GND
COOLING CONTROL WIRING
COOLING CONTROL ONLY
AUX HEAT RANGE
AC/HP SIZE
TYPE
A–C HP–COMFORT HP–EFF
AC/HP CFM TRIM
AC/HP DELAY ON/OFF
0/30
30/30
30/30
0/0
7
RECP 2
1
TRAN
COMMON
BRN
RED
BLK
RED
GRY
BLK
ORN
BLU
VIO
1
2
3
4
5
6
7
8
9
10
11
12
RECP 1
RED
BLU
RED
M1
M2
T1
SEC2
SEC1
T2
T3
PCB
PLUG
24VAC
LVTB
JW2
JW1
L
R
C
O
G
E
W2
W3
GRN/YEL
YEL
BLK
5
4
3
2
1
PLUG 3
PLUG 4
YEL
RECP 3
RECP 4
ICM
BRN
YEL
RED
VIO
RED
ORN
BRN
VIO
ORN
GRY
BLU
BLK
BLK
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
PLUG 2
BLK
YEL
ORN
GRN
RED
BRN
VIO
(SEE NOTE 3)
(SEE NOTE 2)
HPTB
E
Y
1
Y
0
W
2
O
L
R
NOTES:
1. Use copper wire only between disconnect switch and unit.
2. Connect (Y) to (Y), (C) to (C), etc. in pattern shown.
3. Transformer primary leads: BLUE 208V, RED 230V.
4. To be wired in accordandce with NEC and local codes.
5. If any of the original wire, as supplied, must be replaced, use the same or
equivalent type wire.
6. Replace low voltage fuse with no greater than 5 amp fuse.
7. Fuse is wired in series between transformer SEC2 and low voltage "R" circuit.
8. 20KW heater uses one double pole LS on middle top element.
9. 18, 24 and 30KW heaters use double pole limit switches.
10. Largest heaters are shown, smaller heaters will have fewer elements and
components.
11. 1 phase heaters are shown wired for single supply circuit. Multiple
supply circuits may be wired directly to fuse/C.B.'S.
- LEGEND -
MARKED TERMINAL
UNMARKED TERMINAL
FIELD POWER WIRING
PLUG AND RECEPTACLE
PCB BREAKOFF JUMPER
AUXILIARY
PRINTED CIRCUIT BOARD
HEAT PUMP TERM BRD
LOW VOLT TERM BRD
SEQUENCER
HEATER
HIGH VOLTAGE TERMINAL BOX
HUMIDIFIER
AUX
PCB
HPTB
LVTB
SEQ
HTR
HVTB
HUM
320486 - 301 REV. C
LIMIT SWITCH
FAN MOTOR
TRANSFORMER
EQUIPMENT GROUND
FUSE
RECEPTACLE
CIRCUIT BREAKER
LOW VOLTAGE FUSE
BLU
E
Y
1
Y
0
W
2
O
L
R
Y
Y
INDOOR THERMOSTAT
1
3
F
LO
MED
HI
Y1
AUX1 HUM1
AUX2 HUM2
—25—
