INTERIOR MAKE-UP BOX INSTALLATION

Right Side

BOX

FIGURE 28

Refer to figure 29 for schematic wiring diagram, field wiring and trouble shooting.

The power supply wiring must meet Class I restrictions. Protected by either a fuse or circuit breaker, select circuit protection and wire size according to unit nameplate.

NOTE - Unit nameplate states maximum current draw. Maximum over-current protection allowed is 15 AMP. Holes are on both sides of the furnace cabinet to facilitate wiring.

Install a separate (properly sized) disconnect switch near the furnace so that power can be turned off for servicing. 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 and field wiring diagram shown in fig­ ure 29. Use 18-gauge wire or larger that is suitable 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 EL180UHE 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 “EAC” 1/4” spade terminal is provided on the furnace integrated control. See figure 30 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 nal relay.

One line voltage “HUM” 1/4” spade terminal is provided on the furnace integrated control. See figure 30 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 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 30 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.

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 29 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.

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.

2 - When the EL180UHE 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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Lennox International Inc EL180UHE Interior MAKE-UP BOX Installation, Accessory Terminals, Thermostat, Indoor Blower Speeds
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EL180UHE specifications

Lennox International Inc. has long been a leader in providing innovative heating and cooling solutions, and the EL180UHE represents a notable advancement in their line of high-efficiency gas furnaces. Designed to meet the demands of residential heating, this unit combines advanced technology with user-friendly operation and significant energy savings.

One of the standout features of the EL180UHE is its efficiency rating, with an Annual Fuel Utilization Efficiency (AFUE) of up to 80%. This high efficiency not only helps homeowners save on energy bills but also reduces their carbon footprint. The furnace is equipped with a reliable, multi-speed blower motor, which enhances comfort levels by maintaining consistent air circulation throughout the home.

The EL180UHE employs advanced combustion technologies, such as Lennox's low-NOx burner, which minimizes nitrogen oxide emissions, contributing to a cleaner environment. The unit is also designed with a sealed combustion system that draws air directly from the outdoors rather than from inside the home, leading to improved indoor air quality and increased safety.

Another significant characteristic of the EL180UHE is its whisper-quiet operation. This is achieved through well-engineered insulation and a design that minimizes noise levels, allowing for a comfortable living environment without disruptive sounds. Many homeowners appreciate the quiet performance, especially during the night or in spaces where noise is a concern.

The installation process is straightforward, supported by Lennox's user-friendly design. The EL180UHE is compatible with various home configurations and can easily integrate with existing HVAC systems. Additionally, it has a compact footprint, making it suitable for homes with space constraints.

Further enhancing its appeal, this gas furnace features robust warranty options, reflecting Lennox's commitment to quality and customer satisfaction. Homeowners can rest assured that they are investing in a durable product that has been built to last.

In conclusion, Lennox International Inc.'s EL180UHE gas furnace exemplifies the company's dedication to innovation, efficiency, and reliability in home heating solutions. With its high AFUE rating, advanced combustion technology, quiet operation, and user-friendly design, the EL180UHE is an excellent choice for homeowners looking to enhance their comfort while minimizing energy costs.
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