air is drawn from a room, a negative pressure is created in the room.
If a gas appliance is operating in a room with negative pressure, the flue products can be pulled back down the vent pipe and into the room. This reverse flow of the flue gas may result in incomplete combustion and the formation of carbon monoxide gas. This toxic gas might then be distributed through the house by the fur1 nace duct system.
WARNING
Carbon monoxide gas is invisible, odorless, and toxic.
Your furnace is a gas appliance. It is critical that the gas supplied to the unit be completely burned to avoid the pro1 duction of carbon monoxide gas. Complete combustion of the gas requires, but is not limited to, correct gas pressure and gas flow rate, adequate combustion, air, and proper venting.
Exposure to this gas can cause personal injury and even death to all occupants, including pets. Any item that is powered by or gives off heat from a combustion process (including lawn mowers, automobiles, and fireplaces) has the potential to produce carbon monoxide gas. Because of this, Lennox recommends the use of a carbon monox1 ide detector in your home, even if you do not own gas ap1 pliances. Reliable detectors are available at reasonable retail prices. Contact your independent Lennox dealer for more details about this investment in your safety.
Your furnace is designed to meet standards set by na1 tional agencies, and to operate safely when properly installed and maintained. However, the unit's perfor1 mance can be greatly impacted by the individual installa1 tion and the operating environment. It is your responsibil1 ity to ensure that this appliance is maintained. Proper maintenance is critical for your safety and the satisfacto1 ry operation of the product. Lennox strongly recom1 mends annual inspection and maintenance of this ap1 pliance. Contact your independent Lennox dealer for an inspection by a qualified service technician.
WARNING
Do not use this furnace if any part has been underwa( ter. Immediately call a qualified service technician to inspect the furnace and to replace any part of the control system and any gas control which has been under water.
CAUTION
Before attempting to perform any service or mainte( nance, turn the electrical power to unit OFF at the disconnect switch.
IMPORTANT
Any additions, changes, or conversions required in order for the appliance to satisfactorily meet the application needs must be made by a Lennox ser( vice technician using factory specified and ap( proved parts.
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.
Lighting Information & Operation
WARNING
If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or death.
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 unit is equipped with a gas control knob. Use only your hand to turn the gas control knob. Never use tools. If the knob will not push in or turn, do not try to repair it. Call a qualified service technician. Force or attempted repair may result in a fire or explosion.
Placing the GHR32 furnace into operation:
GHR32 units are equipped with a SureLightt ignition sys1 tem. Do not attempt to manually light burners on these fur1 naces. Each time the thermostat calls for heat, the burn1 ers will be automatically lit. The ignitor does not get hot when there is no call for heat on units with the SureLightt ignition system.
Operating the Gas Valve (Figure 3 and 4)
1 - STOP! Read the safety information at the beginning of this section.
2 - Set thermostat to its lowest setting. See figure 2.
THERMOSTATS
Figure 2
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