IMPORTANT SAFETY INFORMATION
Safety markings are used to designate a degree or level of
seriousness and should not be ignored. WARNING indicates a
potentially hazardous situation that if not avoided, could result
in personal injury or death. CAUTION indicates a potentially
hazardous situation that if not avoided, may result in minor or
moderate injury or property damage.
WARNING:
RISK OF ELECTRICAL SHOCK
Shut off all electrical power to the unit before
performing any maintenance or service on the
system. Failure to follow this warning can cause
serious injury, fire, electrical shock, or death.
CAUTION:
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
These instructions describe how to properly replace a single
stage *G6/L1 control board (PN 624631) with a *G7 control
board (PN 624690).
INSTALLATION PROCEDURE
When replacing the *G6/L1 control board (PN 624631) with a
*G7 control board (PN 624690), install all wires from the door
switch and 24V transformer on the same pin locations they were
removed from. This means the wire that was attached to the
L1 terminal on the G6 control board (624631) will need to be
attached to the L1 terminal on the G7 board (624690), the wire
on the XFMR terminal of the *G6/L1 board (Figure 1) should be
placed on the XFMR terminal of the *G7 board (Figure 2), etc.
When connecting the wires from the thermostat, heat pump, AC
unit, or air handler to the RCYGW terminals of the *G7 board,
install all wires on the same terminals they were removed from.
When connecting the wires from the blower motor, please note
which wire connects to the HEAT and COOL terminals on the
*G7 control board. See Table 1. NOTE: If the motor does not
have an orange wire, do not place any wire on the Medium Low
terminal, this should be left empty.
The 6 pin (P1) and the 9 pin (P2) wire plugs will connect directly
to the 624690 control board, there is no need to change any
wire position.
Place label with flash codes near the wiring diagram on the
furnace door for future reference.
R C Y G W
Flame Signal
Light (Yellow)
60
90
120
180
TWIN
3 Amp Fuse
COM
24 V
HUM
Neutrals
41
52
63
7
8
9
4
5
6
1
2
3
EAC
HUM
M1
M2
M3
COOL
HEAT
L1
XFMR
Unused Motor
Leads
EAC
Electronic Air Tap
(.5A@ 120 VAC)
Status
Light (Red)
Humidifier Tap
(.5A@ 120 VAC)
Connect
Neutral
Lead of
Electronic
Air Cleaner
and/or Humidifier
Here.
Common
Leads
Blower Off
Timing
These motor speed taps are
not used for two-stage models
Figure 1. *G6/L1 Single Stage Control Board
RCYGW
STAT US
FLAME
180
COOL
HEAT
120
90
60
BLOWER
OFF
DELAY
LOW
ML
MH
HIGH
EAC
L1
XFMR
HUM
24V
P1
5
NEUTRALS
2
6
3
4
1
7
8
9
5
2
6
3
4
1
FAN
COM
3 Amp Fuse
P2
Figure 2. *G7 Single Stage Control Board
INSTALLATION INSTRUCTIONS
Replacing a single stage *G6/L1 control board with a *G7 control board
COMPONENT
*G6/L1
TERMINAL
BOARD
(624631)
WIRE
COLOR
*G7 TERMINAL
BOARD
(624690)
AIR
CLEANER
EAC Black EAC
Neutral White Neutral
BLOWER
MOTOR
COOL
M1/M2
HEAT
Black HIGH
Blue MH
Orange ML
Red LOW
DOOR
SWITCH
L1 Black L1
Neutral White Neutral
HUMIDIFIER
HUM Black HUM
Neutral White Neutral
24V
TRANSFORMER
XFMR Black XFMR
Neutral White Neutral
24V Black with white stripe 24V
COM White with black stripe COM
6 PIN
CONNECTOR
P1 Multi P1
9 PIN
CONNECTOR
P2 Multi P2
Table 1. Control Board Wire Chart
709002B (Replaces 709002A)
WIRING DIAGRAM
IGNITOR
INDUCER
GAS
VALVE
SUPPLY AIR
LIMIT SWITCH
(ALL MODELS)
VENT
SAFETY SWITCH
(SELECT
MODELS ONLY)
TRANSFORMER
FLAME SENSOR
C
GREEN
BLACK
WHITE
BLUE
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
BLOWER DOOR
SWITCH
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)
VENT
PRESSURE SWITCH
(93+ MODELS ONLY)
PRESSURE
SWITCH
R
Y
G
W
C
Y
180
120
90
60
These wires are
not present
on all models
BLOWER
DECK SWITCH
(SELECT
MODELS ONLY )
Legend
Field Wiring
Factory Wiring:
Low Voltage
High Voltage
Power On
Limit Circuit Open or External Load On "W"
Pressure Switch is Open with Inducer On
Pressure Switch is Closed with Inducer Off
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
Low Flame Sensor Signal
Flame Present
Continuous
Flash
OFF
ON
FLAME
YELLOW
LIGHT
FAULT CONDITION
BLUE
FLAME
ROLL-OUT SWITCH
(SELECT
MODELS ONLY )
Refer to the Installation
Instructions provided
with the furnace for the
proper heating and
cooling speeds for your
application.
VENT SAFETY SWITCH
(SELECT MODELS ONLY)
For 80+ and 90+ Model Furnaces
7103550 (Replaces 7103250)
If any of the original
wire as supplied with
the furnace must be
replaced, it must be
replaced with wiring
material having a
temperature rating of
at least 105° C.
Use copper
conductors only.
¢710355!¤
Figure 3. *G6/L1 Wiring Diagram
IGNITOR
INDUCER
FLAME SENSOR
C
VENT
LIMIT SWITCH
(ON SELECT
MODELS)
DOOR
SWITCH
R
4 SPEED MOTOR
WHITE
RED
BLUE
ORANGE
BLACK
FLAME
ROLL-OUT
SWITCH
GAS
VALVE
H
MH
ML
L
C
BLOWER
LIMIT
SUPPLY
AIR LIMIT
BLOWER
LIMIT
PRESSURE
SWITCH
(ON SELECT
MODELS)
PRESSURE
SWITCH
RCYGW
GREEN
HIGH
COOL
FAN
HEAT
MH
ML
LOW
RED
YELLOW
BLWR OFF
DELAY
LOW
ML
MH
HIGH
EAC
L1
XFMR
HUM
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
COM
3 AMP FUSE
24V
24 V
120 V
WHITE
BLACK
WHITE W/ BLK STRIPES
BLK W/ WHITE STRIPES
NEUTRALS
L1A
1234
1234
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
RED
(ON SELECT
MODELS)
ORANGE
BLUE
BLACK
WHITE
BLUE
BLUE
GREEN
GROUND
BLACK
BLACK 120V
WHITE
WHITE (NEUTRAL)
ORANGE
BLUE
YELLOW
YELLOW
RED
ORANGE
BLACK
WHITE
BLUE
ORANGE
BLACK
RED
BLACK
BLACK
BLACK
BLUE
BLUE
BLUE
BLUE
BLUE
ORANGE
BLUE
GREEN
BLUE
BLACK
BLACK
WHITE
BLACK
WHITE
710731D
FIELD WIRING
LEGEND:
0208
LOW VOLTAGE
HIGH VOLTAGE
WIRING DIAGRAM
For 80+ and 90+
Single Stage Furnaces
SINGLE STAGE
THERMOSTAT
TO OUTDOOR UNIT
If any of the origInal wire as supplied with the
furnace must be replaced, it must be replaced
with wiring material having a temperature
rating of at least 105° C.
Use copper conductors only.
Refer to the Installation Instructions
provided with the furnace for the
proper heating and cooling speeds
for your application.
Green LEDRed LED
Control Fault (No Power) OffOff
L1 / Neutral Polarity FaultFlash Flash
1 Hour Lockout
Normal Operation On On
Pressure Switch Closed FaultOnFlash
Pressure Switch Open FaultFlash On
Open Limit Switch Fault FlashOff
Low Flame Sensor Signal
Flame Present
Diagnostic Description
FAULT CONDITIONS
Diagnostic Description Yellow LED
Continuous Flash
On
Alternating Flash
Figure 4. *G7 Wiring Diagram
Specifications & illustrations subject to change without notice or incurring obligations (10/15).
O’Fallon, MO, © Nortek Global HVAC LLC 2015. All Rights Reserved.
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