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WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
Electrically ground the unit according to local codes or, in
the absence of local codes, according to the current Na-
tional Electric Code (ANSI/NFPA No. 70). A green ground
wire is provided in the field make-up box.
NOTE - The ML180DFE furnace contains electronic com-
ponents that are polarity sensitive. Make sure that the fur-
nace is wired correctly and is properly grounded.
Accessory Terminals See page 22 and 23 for ignition con-
trol and diagnostic code tables.
One line voltage "EAC" 1/4" spade terminal is provided on
the furnace integrated control. This terminal is energized
when the indoor blower is operating. Any accessory rated
up to one amp can be connected to this terminal with the
neutral leg of the circuit being connected to one of the pro-
vided neutral terminals. If an accessory rated at greater
than one amp is connected to this terminal, it is necessary
to use an external relay.
One line voltage "HUM" 1/4" spade terminal is provided on
the furnace integrated control. This terminal is energized
in the heating mode when the combustion air inducer is
operating. Any humidifier rated up to one amp can be con-
nected to this terminal with the neutral leg of the circuit be-
ing connected to one of the provided neutral terminals. If
a humidifier rated at greater than one amp is connected to
this terminal, it is necessary to use an external relayOne
24V "H" 1/4" spade terminal is provided on the furnace
integrated control. The terminal is energized in the heating
mode when the combustion air inducer is operating and
the pressure switch is closed. Any humidifier rated up to
0.5 amp can be connected to this terminal with the ground
leg of the circuit connected to ground or the "C" terminal.
Generator Use - Voltage Requirements
The following requirements must be kept in mind when
specifying a generator for use with this equipment:
•
The furnace requires 120 volts + 10% (Range: 108
volts to 132 volts).
•
The furnace operates at 60 Hz + 5% (Range: 57 Hz
to 63 Hz).
•
The furnace integrated control requires both proper
polarity and proper ground. Both polarity and proper
grounding should be checked before attempting to
operate the furnace on either permanent or tempo-
rary power.
•
Generator should have a wave form distortion of
less than 5% total harmonic distortion.
Thermostat
Install the room thermostat according to the instructions
provided with the thermostat. See figure 21 for thermostat
designations. If the furnace is being matched with a heat
pump, refer to the FM21 installation instruction or appro-
priate dual fuel thermostat instructions.
Indoor Blower Speeds
1 - When the thermostat is set to "FAN ON," the indoor
blower will run continuously on the fan speed when
there is no cooling or heating demand. See TABLE
14 for allowable continuous circulation speeds.
2 - When the ML180DFE is running in the heating mode,
the indoor blower will run on the heating speed.
3 - When there is a cooling demand, the indoor blower
will run on the cooling speed.
Page 20
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