14
Figure 24. Control Panel (All Models)
On-Off
Switch
Blower
Plug
Power
Entry
On-Auto Switch
(Heating Models Only)
Thermostat Wires
Furnace
Control Box
To combustion
Blower or Flame
Roll-out Switch
To Gas Valve
or Burner
IMPORTANT NOTE:
Refer to the wiring diagram inside the control box
cover or
and
for the wiring of your particular unit. Any other wiring
methods must be acceptable to authority having
jurisdiction.
CAUTION:
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
IMPORTANT NOTE:
Proper line voltage polarity must be maintained in
order for the control system to operate correctly.
Verify the incoming neutral line is connected to the
white wire and the incoming “hot” line is connected
to the black wire. The furnace will not operate unless
the polarity and ground are properly connected as
For installation of A-size Cabinet furnaces, allow sufficient
slack in the wiring if an optional cooling coil cabinet is
added at a later time.
Use of copper conductors is
recommended.
Connecting Power Supply Wires
1. Remove the furnace control panel cover.
2. Route wires (115 VAC) through the strain relief on the
left side of the furnace control box. See
3. Connect the
hot
wire to the
black
pigtail lead, and
the
neutral
wire to the
white
pigtail lead. Secure all
connections with suitable wire nuts.
4. Connect the
ground
wire to the grounding screw.
5. Reinstall the control panel cover and secure with the
original mounting screws.
Figure 25. Thermostat Wiring for UTEC/NORDYNE
Control boards
Rc
R
H
W
G
Y
Red
White
Yellow
Red
White
Yellow
Grey
THERMOSTAT
FURNACE
To AC Contactor
ECM
Blower
Motor
R
W
G
C
Figure 26. Thermostat Wiring for Emerson
control boards
Rc
R
H
W
G
Y
Red
White
Red
White
Green
Grey
THERMOSTAT
FURNACE
R
W
G
Y
C
Green
Yellow
Yellow
Grey
C
Grey
Yellow
To AC
Contactor
Summary of Contents for MG1 Series
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