Nordyne Downflow Condensing Furnace M3RL - Manual (Page 33)

33
Figure 30. Downflow Furnace Wiring Diagram
WD #710240B
If any of the original
with
the furnace must be
replaced, it must be
replaced
wiring
material having a
rating of
at least ˚ C.
Use copper
conductors
only.
IGNITOR
INDUCER
GAS
VALVE
SUPPLY AIR
LIMIT SWITCH
(ALL MODELS)
VENT
SAFETY
SWITCH
(ALL MODELS)
TRANSFORMER
FLAME SENSOR
C
GREEN
BLACK WHITE
BLUE
24 V 120 V
ORANGE BLUE BLUE
YELLOW
BROWN
RED
BLACK
WHITE
ORANGE
BLUE
BLACK
ORANGE
BLACK
RED
AIR CONDITIONER
CONDENSING UNIT
BLACK
BLACK R
WHITE
BLACK
WHITE W/ BLK STRIPES
BLK W/ WHITE STRIPES
WHITE (NEUTRAL)
BLACK 120V
GROUND
ROOM THERMOSTAT
3 OR 4 SPEED MOTOR
H
MH
ML
L
C
WHITE RED ORANGE BLUE BLACK
MOTOR
PLUG
1
2
3
4
5
6
BLACK
BLUE
FLAME ROLL-OUT
SWITCH
(ALL MODELS)
PRESSURE
SWITCH
R
Y
G
W
C
Y
180 120 90 60
Legend
Field Wiring
Factory Wiring:
Low Voltage
High Voltage
BLOWER DECK SWITCH
Factory Wired
Heating Speeds
Furnace
Input, Btuh
60,000
80,000
Wire
Color
Red
Blue
Power On
Limit Circuit Open or External Load On "W"
(Does not apply to Deck Switch, see below)
Pressure Switch Open with Inducer On
Pressure Switch Closed with Inducer On
Ignition Failure (Check Ground)
115 VAC & Neutral Reversed or no Ground
False Flame or Gas Valve Relay Shorted
ON
1 FLASH
2 FLASHES
3 FLASHES
4 FLASHES
5 FLASHES
Continuous
STATUS
RED
LIGHT
FAULT CONDITION
Power Off or Deck Limit Open
Low Flame Sensor Signal
Flame Present
Continuous
Flash
OFF
ON
FLAME
YELLOW
LIGHT FAULT CONDITION
ON/OFF SWITCH