Lenox ML180UHE installation instructions Thermostat Designations

Before connecting the thermostat, check to make sure the wires will be long enough for servicing at a later date. Make sure that thermostat wire is long enough to facilitate future removal of blower for service.

Complete the wiring connections to the equipment. Use the provided unit wiring diagram and the field wiring diagram shown in figure 33. Use 18−gauge wire or larger that is suit- able for Class II rating for thermostat connections.

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 ML180UHE furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.

Accessory Terminals

One line voltage ade terminal is provided on

the furnace integrated control. See figure 34 for integrated control configuration. 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 provided neutral terminals. If an accessory rated at greater than one amp is connected to this terminal, it is necessary to use an exter-

Generator Use − Voltage Requirements

The following requirements must be kept in mind when specifying a generator for use with this equipment:

SThe furnace requires 120 volts + 10% (Range: 108 volts to 132 volts).

SThe furnace operates at 60 Hz + 5% (Range: 57 Hz to 63 Hz).

SThe furnace integrated control requires both polarity and proper ground. Both polarity and proper grounding should be checked before attempting to operate the furnace on either permanent or temporary power.

SGenerator 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 31 for thermostat

designations. If the furnace is being matched with a heat pump, refer to the FM21 installation instruction or appropri-

ate dual fuel thermostat instructions.

ML180UHE and CONDENSING UNIT

THERMOSTAT DESIGNATIONS

(Refer to specific thermostat and outdoor unit.)

Thermostat	Furnace	Condensing
		Unit

nal relay.

One line voltage ade terminal is provided on

the furnace integrated control. See figure 34 for integrated control configuration. This terminal is energized in the heating mode when the combustion air inducer is operat- ing. Any humidifier rated up to one amp can be connected to this terminal with the neutral leg of the circuit being con-

R

W1

Y

G

C

POWER

HEAT

COOLING

INDOOR BLOWER

COMMON

R

W

Y

G

C

*CONDENSING

UNIT

CONDENSING

UNIT

CONDENSING UNIT COMMON

nected to one of the provided neutral terminals. If a humidi- fier rated at greater than one amp is connected to this termi- nal, it is necessary to use an external relay relay.

One 24V "H" 1/4" spade terminal is provided on the furnace integrated control. See figure 34 for integrated control con- figuration. The terminal is energized in the heating mode when the combustion air inducer is operating and the pres- sure 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.

*NOTE −

FIGURE 31

Indoor Blower Speeds

1 − When the thermostat is set to AN ON," the indoor blower will run continuously on the fan speed when there is no cooling or heating demand.

2 − When the ML180UHE 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.

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