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Electrical
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic com-
ponents. Take precautions during furnace installa-
tion and service to protect the furnace's electronic
controls. Precautions will help to avoid control ex-
posure to electrostatic discharge by putting the fur-
nace, the control and the technician at the same
electrostatic potential. Neutralize electrostatic
charge by touching hand and all tools on an un-
painted unit surface, such as the gas valve or blower
deck, before performing any service procedure.
A power wiring harness is shipped with each G61MPVT
furnace. An IEC receptacle is provided on the right side of
the unit. Plug the harness into the IEC receptacle and into a
properly sized wall plug.
Refer to figure 31 and table 9 for field wiring and figure 32
for schematic wiring diagram and troubleshooting.
1 − Ensure that power connection point is located with 2m
of furnace.
2 − Holes are on both sides of the furnace cabinet to facili-
tate thermostat wiring.
3 − Before connecting the thermostat wiring, check to
make sure the wires will be long enough for servicing at
a later date. Remove the blower access panel to check
the length of the wire.
4 − Complete the wiring connections to the equipment.
Use the provided unit wiring diagram and the field wir-
ing diagram shown in figure 31 and table 9. Use
18−gauge wire or larger that is suitable for Class II ra-
ting for thermostat connections.
5 − Electrically ground the unit according to local codes.
NOTE − The G61MPVT furnace contains electronic
components that are polarity sensitive. Make sure that
the furnace is wired correctly and is properly grounded.
6 − One line voltage EAC" spade terminal is provided on
the furnace control board. Any electronic air cleaner
rated up to one amp can be connected to this terminal
with the neutral leg of the circuit being connected to
one of the provided neutral terminals. See figure 33 for
control board configuration. This terminal is energized
when the indoor blower is operating.
7 − One line voltage HUM" spade terminal is provided on
the furnace control board. Any humidifier rated up to
one amp can be connected to this terminal with the
neutral leg of the circuit being connected to one of the
provided neutral terminals. See figure 33 for control
board configuration. This terminal is energized in the
heating mode when the combustion air inducer is oper-
ating.
8 − Install the room thermostat according to the instruc-
tions provided with the thermostat. See table 9 for ther-
mostat connections. If the furnace is being matched
with a heat pump, refer to the instruction packaged with
the dual fuel thermostat.
Indoor Blower Speeds
1 − When the thermostat is set to FAN ON," the indoor
blower will run continuously at approximately 38% of
the second−stage cooling speed when there is no cool-
ing or heating demand.
2 − When the G61MPVT is running in the heating mode,
the indoor blower will run on the heating speed desig-
nated by the positions of DIP switches 7 and 8.
3 − When there is a cooling demand, the indoor blower will
run on the cooling speed designated by the positions
of DIP switches 3 and 4.
Page 23
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