Lennox International Inc EL280DF Unit Start−Up, For Your Safety Read Before Lighting

settings provide lower supply air temperatures; shorter set- tings provide higher supply air temperatures.Table 10 pro- vides the blower off timings that will result from different switch settings.

TABLE 10

Heating Blower−Off Delay Switch Settings

Blower Off Delay	Switch 3	Switch 4
(Seconds)
60	Off	On
90	Off	Off
(factory setting)
120	On	Off
180	On	On

Switch 5 −− Cooling Blower−Off Delay −− The cooling blower−off delay (time that the blower operates after the cooling demand has been satisfied) can be adjusted by moving switch 5 on the integrated control. The switch is fac- tory−set in the OFF position, which provides a cooling blow- er−off delay of 45 seconds. If the switch is toggled to the ON position, it will provide a 2−second cooling blower−off delay

On−Board Link W951

On−board link W951 is a clippable connection between ter- minals R and O on the integrated control. W951 must be cut when the furnace is installed in applications which include a heat pump unit and a thermostat which features dual fuel use. If the link is left intact, terminal

gized eliminating the HEAT MODE in the heat pump. On−Board Link W915

On−board link W915 is a clippable connection between ter- minals Y1 and Y2 on the integrated control. W915 must be cut if two−stage cooling will be used. If the link is not cut the outdoor unit will operate in second−stage cooling only.

Unit Start−Up

FOR YOUR SAFETY READ BEFORE LIGHTING

WARNING

Do not use this furnace if any part has been under- water. A flood−damaged furnace is extremely dan- gerous. Attempts to use the furnace can result in fire or explosion. Immediately call a qualified ser- vice technician to inspect the furnace and to replace all gas controls, control system parts, and electrical parts that have been wet or to replace the furnace, if deemed necessary.

WARNING

If overheating occurs or if gas supply fails to shut off, shut off the manual gas valve to the appliance before shutting off electrical supply.

CAUTION

Before attempting to perform any service or mainte- nance, turn the electrical power to unit OFF at dis- connect switch.

BEFORE LIGHTING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.

The gas valve on the EL280DF unit will be equipped with a gas control switch. Use only your hand to move the switch. Never use tools. If the switch will not turn or if the control switch will not move by hand, do not try to repair it.

Placing the furnace into operation:

EL280DF units are equipped with an automatic ignition system. Do not attempt to manually light burners on these furnaces. Each time the thermostat calls for heat, the burners will automatically light. The ignitor does not get hot when there is no call for heat on units with an automatic ignition system.

WARNING

If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or death.

Gas Valve Operation (Figure 22)

1 − STOP! Read the safety information at the beginning of this section.

2 − Set the thermostat to the lowest setting.

3 − Turn off all electrical power to the unit.

4 − This furnace is equipped with an ignition device which automatically lights the burners. Do not try to light the burners by hand.

5 − Remove the upper access panel.

6 − Move switch on gas valve to OFF. Do not force. See figure 22.

7 − Wait five minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instruc- tions. If you do not smell gas go to next step.

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