Lennox International Inc ML180UH, LENOX GAS FURNACE manual Start−Up & Operation Information

and maintained. However, the unit’s performance can be greatly impacted by the individual installation and the op- erating environment. It is your responsibility to ensure that this appliance is maintained. Proper maintenance is criti- cal for your safety and the satisfactory operation of the product. Lennox strongly recommends annual in- spection and maintenance of this appliance. Contact your Lennox dealer for an inspection by a licensed profes- sional service technician (or equivalent).

DANGER

Danger of explosion.

There are circumstances in which odorant used with LP/propane gas can lose its scent. In case of a leak, LP/propane gas will settle close to the floor and may

Operating the Gas Valve (Figure 2)

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. See figure 2.

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.

8 − Move switch on gas valve to ON. See figure 2.

be difficult to smell. An LP/propane leak detector should be installed in all LP applications.

Do not attempt to bleed the gas lines of air. Call your local gas provider.

Start−Up & Operation Information

WARNING

If you do not follow these instructions exactly, a fire

MANIFOLD

PRESSURE

ADJUSTMENT

SCREW

INLET
PRESSURE
PORT	GAS VALVE SHOWN IN ON POSITION

MANIFOLD PRESSURE OUTLET PORT

or explosion may result causing property damage, personal injury or death.

BEFORE PLACING THE UNIT INTO OPERATION, 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 ML180UH will be equipped with a gas control switch. Use only your hand to move the switch. Never use tools. If the switch will not move by hand, do not try to repair it. Call a licensed professional service technician (or equivalent). Force or attempted re- pair may result in a fire or explosion.

Placing the ML180UH furnace into operation: ML180UH units are equipped with an ignition system. Do not attempt to manually light burners on this furnace. 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 this ignition system.

FIGURE 2

9 − Replace the upper access panel.

10 − Turn on all electrical power to to the unit.

11 − Set the thermostat to desired setting.

NOTE − When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.

12 − If the appliance will not operate, follow the section urning Off Gas to the Unit" and call your licensed professional service technician (or equivalent).

Turning Off Gas to the Unit

1 − Set the thermostat to the lowest setting.

2 − Turn off all electrical power to the unit if service is to be performed.

3 − Remove the upper access panel.

4 − Move switch on gas valve OFF.

5 − Replace the upper access panel.

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