Integrated Control

TWO−STAGE INTEGRATED CONTROL

1/4" QUICK CONNECT TERMINALS

DIAGNOSTIC

LEDs

DIP

SWITCHES

ON−BOARD

LINKS

SENSE = 120 VAC OUTPUT TO FLAME SENSER

NEUTRALS= 120 VAC NEUTRAL

PARK = DEAD TERMINAL FOR UNUSED BLOWER LEAD

HEAT LOW = 120 VAC OUTPUT TO CIRC BLWR −− LOW HT SPEED HEAT HIGH/ COOL LOW = 120 VAC OUTPUT TO CIRC BLWR −−

HIGH HEAT AND LOW COOL SPEED

COOL HIGH = 120 VAC OUTPUT TO CIRC BLWR −− HIGH COOL SPEED

THERMOSTAT CONNECTIONS (TB1)

1= ERROR CODE RECALL H= 24V HUMIDIFIER OUTPUT

L= LENNOX SYSTEM OPERATION MONITOR

DIP SWITCH FUNCTIONS

W915

W951

DIP SWITCH(ES)		FUNCTION

1 −− 2 Stage T’stat		Selects t/stat type (single or two−stage)
2 −− 2nd Stage Delay		Second stage ON delay (single−stage t’stat)
3 & 4	−− Heat Off Delay	Heating fan OFF delay
5 −−	Cool Off Delay	Cooling fan OFF delay

	FIGURE 21
EL280DF units are equipped with a two−stage integrated		Switch 2 −− Second Stage Delay (Used with Single−
control. This control manages ignition timing and fan off		Stage Thermostat Only) −− This switch is used to deter-
delays based on selections made using the control DIP		mine the second stage on delay when a single−stage ther-
switches and jumpers. The control includes an internal
		mostat is being used. The switch is factory−set in the OFF
watchguard feature which automatically resets the ignition
		position, which provides a 10−minute delay before second−
control when it has been locked out. After one hour of con-
		stage heat is initiated. If the switch is toggled to the ON
tinuous thermostat demand for heat, the watchguard will

break and remake thermostat demand to the furnace and		position, it will provide a 15−minute delay before second−
automatically reset the control to relight the furnace.		stage heat is initiated. This switch is only activated when
DIP Switch Settings		the thermostat selector jumper is positioned for SINGLE−
Switch 1 −− Thermostat Selection −− This unit may be used		stage thermostat use.

with either a single−stage or two−stage thermostat. The		Switches 3 and 4 −− Heating Blower−Off Delay −− The
thermostat selection is made using a DIP switch which
		heating blower−on delay of 45 seconds is not adjustable.
must be properly positioned for the particular application.
		The heating blower−off delay (time that the blower operates
The DIP switch is factory−positioned for use with a two−
		after the heating demand has been satisfied) can be ad-
stage thermostat. If a single−stage thermostat is to be used,
		justed by moving switches 3 and 4 on the integrated con-
the DIP switch must be repositioned.
		trol. The unit is shipped from the factory with a heating

Select	" for two−stage heating operation con-	blower−off delay of 90 seconds. The heating blower off
trolled by a two−stage heating thermostat (factory set-
		delay affects comfort and is adjustable to satisfy individual
ting);
		applications. Adjust the blower off delay to achieve a sup-
b − Select	" for two−stage heating operation con-

trolled by a single−stage heating thermostat. This set-		ply air temperature between 90° and 110°F at the exact
ting provides a timed delay before second−stage heat		moment that the blower is de−energized. Longer off delay
is initiated.

Page 23

EL280DF specifications

Lennox International Inc. has been a leader in the HVAC (Heating, Ventilation, and Air Conditioning) industry for decades, consistently delivering high-quality and energy-efficient products. Among their lineup, the Lennox EL280DF Gas Furnace stands out as an excellent option for homeowners seeking reliable heating solutions.

The EL280DF is a two-stage gas furnace that offers improved efficiency and comfort, making it an ideal choice for moderate climates. One of the main features of the EL280DF is its energy efficiency, boasting an AFUE (Annual Fuel Utilization Efficiency) rating of up to 80%. This means that a significant portion of the fuel consumed is converted into heating energy, resulting in lower energy bills and reduced environmental impact.

Another noteworthy characteristic of the EL280DF is its quiet operation. Equipped with advanced sound-dampening technologies, the furnace operates with minimal noise, ensuring that your home remains a serene environment. This is especially important during the colder months when the furnace is often in frequent use.

The EL280DF also employs a two-stage heating system, which allows it to operate at a lower capacity during milder temperatures and ramp up to full capacity during the coldest days. This feature not only enhances comfort by maintaining a more consistent temperature but also contributes to energy savings by reducing unnecessary energy consumption.

In terms of installation, the EL280DF is designed for flexibility. It can be configured for various types of homes and installations, making it suitable for both new constructions and system replacements. Its compact size allows it to fit in tight spaces, providing versatility in home design.

Moreover, the EL280DF is equipped with a durable heat exchanger that ensures longevity and reliability. Lennox has also included features like a self-diagnostic control board, making troubleshooting easier and enhancing the overall reliability of the system.

In conclusion, the Lennox EL280DF Gas Furnace is a remarkable combination of efficiency, quiet operation, and versatility. With its two-stage heating capabilities and advanced technologies, it stands as a solid choice for homeowners looking to invest in a durable and energy-efficient heating solution. Whether building a new home or upgrading an old system, the EL280DF promises comfort and reliability during the coldest months of the year.