Nortek MG1 Series - Wiring Diagrams; Emerson Control Board Wiring and Settings

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Figure 33. Emerson Board Wiring Diagram
10436620
(NEW)
07/22
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE
WIRING DIAGRAM
Gas Direct IgniƟon Furnace, HeaƟng & A/C Ready. NOTES: 1. Incoming power must be polarized. Observe color coding. (See furnace data label for electrical informaƟon.) 2. If any of the original wires (as supplied with the appliance) must be replaced, use 105C ThermoplasƟc type wire or its equivalent. 3. A wire from “Y” on the thermostat to the furnace is required.
Refer to the Installation Instructions provided with the furnace for the proper heating and cooling speeds for your application. If any of the original wire as supplied with the furnace must be replaced, it must be replaced with wiring material having a temperature of at least 105 C. Use copper conductors only.
Red LED Flash Error/Condition
1 System Lockout (Retries Exceeded) 2 Pressure Switch Stuck Closed 3 Pressure Switch Stuck Open 4 Open High Temperature Limit Switch 5 Flame Sensed>4.25 Seconds with Gas Valve De-Energized 6 Open Flame RO Switch 8 Ignitor Relay Error
10 Open Fuse 11 Ignitor Open 12 Inducer Relay Error
7 Low Flame Sense Signal 9 Twinning Fault
Control Failure / No Power / Internal Fault / IRQ Loss
Gas Heating Lockout (Gas valve energized when it should be de-energized)
Or Gas valve De-energized when it should be Energized
Rapid Flash Reverse Polarity
Continuous On Normal Operation
Flash codes stored in memory (auto-erased after 14 days)
Flash codes NOT stored in memory
Off
1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3
Position OFF OFF OFF ON OFF OFF ON ON OFF OFF ON OFF OFF OFF ON OFF ON ON ON OFF ON ON ON ON
Motor
SPEED
Cool
Y T1 T2 T3 T4 T1+T2 T1 T1 T1
Cool Motor SPEED DIPSWITCH SETTING (S1-1, S1-2, S1-3)
1 2 1 2 1 2 1 2
Position OFF OFF ON OFF ON ON OFF ON
Motor
SPEED
Heat
W T1 T2 T3 T4
Heat Motor SPEED DIPSWITCH SETTING (S2-1, S2-2)
1 2 1 2 1 2 1 2
Position OFF OFF ON OFF OFF ON ON ON
Motor
SPEED
Fan
G T1 T2 T4 T1+T2
Fan Motor SPEED DIPSWITCH SETTING (S2-3, S2-4)
T1
T2
T4
X
COM
T3
4 1
8 5 2
9
12 10
3
6
7
11
LINE-N
XFMR-N
CIRC-N
120V HUM-N
EAC-N
IND-N
IGN-N
EAC-H
120V HUM-H
CIRC-H
XFRM-H
LINE-H
Y/ Y2
W
RGC
DHUM
Y
Y1
TRANS-
FORMER
115V
24V
N
C
L
R
ON/OFF
SWITCH
GROUND
SCREW
WIRE NUTS
SUPPLIED
BY
INSTALLER
IGNITOR
1 2
1 2
GAS VALVE
PRESSURE
SWITCH
HI-LIMIT
AUX. LIMIT
L1
NEUTRAL
1 2 3 4 5 N L C G
ECM
BLOWER
MOTOR
GROUND
SCREW
1 2 3 4 5 6 1 2 3 4 5 6
G
W
Y
R
C
COMBUSTION
FAN
BLACK
BLACK
1 1
2 2
FLAME SENSOR
FURNACE ELECTRICAL BOX
WHITE
*Refer to blower table for factory heaƟng speed.
WHITE
WHITE
WHITE
WHITE
WHITE
BLACK
BLACK
BLACK
BLACK
BLACK
RED
GREEN
YELLOW
GRAY
YELLOW
YELLOW
GREEN
ORANGE
ORANGE
BLUE
BLUE
BLUE
RED
GREEN
GREEN
GREEN
BLACK
YELLOW
WHITE
GRAY
YELLOW
RED
GRAY
BK/WH STRIPE
BK/WH STRIPE
WH/BK STRIPE