Nortek FG7MQ - Electrical Diagrams and Specifications; Wire Length and Voltage Specifications Table; Motor Control Board Diagram; Modulating Furnace Control Board Diagram

31

LINE-N
LINE-N
XFMR-N
LINE OU
T
XFMR
EAC
LINE
EAC-N
COM
3 AMP
FUSE
24V
3
6
2
5
1
4
VP
RX
TX
MVT
ORANGE
YELLOW
BROWN
RED
GREEN
C
DX-
DX+
2
3
1
R
1
2
34
5
YELLOW
RED
GREEN
TR
COMMUNICATION
CABLE TERMINAL
OFF
ON
Model Selection
Switch
Modulating Furnace Control Board

Variable Speed Motor Control Board
GROUND
SENSOR
DHUM_IN
Y1_E
H_OUT
L2-OUT
L2-IN
L1-IN
L1-OUT
Y1_OUT
Y/Y2_OUT
W_OUT
C
EXPANSION PORT
R
RED
GREEN
NOT FOR
FIELD USE
MOTOR WIRING
HARNESS
RED
INPUT TERMINALS
STATUS LIGHTS
1 2 3
4
5 6 7
8
NOT USED ON
iQ SYSTEMS
COMMUNICATION
CABLE TERMINAL
P2
P3
SWITCH NUMBER
BTUH INPUT 1 2 3
60,000   
80,000   
100,000   
120,000   
Table 10
FURNACE
INPUT
(BTUH)
CABINET
WIDTH

NOMINAL
ELECTRICAL
SUPPLY
MAXIMUM
OPERATING
VOLTAGE
MINIMUM
OPERATING
VOLTAGE
MAXIMUM
FURNACE
AMPERES
MAXIMUM
FUSE OR CIRCUIT

60,000 17 ½  127 103 7.2 15
80,000 21  127 103 9.4 15
100,000 21  127 103 9.4 15
120,000 24 ½  127 103 11.9 15
THERMOSTAT WIRE GAUGE
RECOMMENDED THERMOSTAT WIRE LENGTH
2 - WIRE
(HEATING)
4 OR 5 WIRE
(COOLING)
24 55 ft. 25 ft.
22 90 ft. 45 ft.
20 140 ft. 70 ft.
18 225 ft. 110 ft.


