The off-delay is set by moving a set of switches on the control. The Wiring Diagram located on the inside of the blower door shows the various delay combinations. Refer to Fig. 2 for location of the control.
If you are unsure how to set the Off-delay Control, contact a Qualified Service Agency.
Set the room thermostat slightly above room temperature. This will automatically signal the furnace to start. The inducer motor will start, and the hot surface igniter will have an orange glow. After about 32 seconds (from the call for heat at the thermostat), the gas valve permits gas to flow to the main burners where it is ignited. When the flame is firmly established, the igniter shuts off. Hot flames begin to warm the furnace’s heat exchanger. After a time delay of 30 seconds (45 seconds for low-stage), the furnace blower is switched on.
NOTE: If the main burners fail to ignite, the furnace control system will go through 3 more ignition cycles. Then, if burners fail to ignite, the system will lockout. If lockout occurs, or the blower doesn’t come on, shut down your furnace and call a Qualified Service Agency for service.
Pressure Switch
The furnace is equipped with one or more pressure switches to shut down the furnace under various flue conditions. The switches are connected to the furnace by factory supplied tubing.
Operating Your Furnace
Keep the blower access door and all access panels in place except for inspection or maintenance.
Before starting your furnace be sure you read and understand all of the procedures in this manual. Check to make sure the furnace filter is clean and correctly installed.
!WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or death.
Provisions for combustion and ventilation air must be provided for in accordance with installation instructions supplied with furnace.
Starting The Furnace
See Fig. 3 for an illustration of the gas control valve.
1.Turn the thermostat to its lowest temperature setting or to OFF if equipped with a System Select Switch.
2.Turn OFF all electric power to the furnace at the disconnect switch or circuit breaker.
3.Remove the burner compartment door by removing the two(2) screws securing the door in front and lifting the door up and outwards. Removing the door will expose the gas control valve knob.
4.Turn the gas control valve to the OFF position. See Fig. 3.
5.Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow the safety information on the cover of this manual. If you do not smell gas, go to the next step.
6.Turn the gas control valve to the ON position. See Fig. 3.
7.Reinstall all doors.
8.Turn ON all electrical power to the furnace.
9.Set the thermostat to the desired temperature and the System Select Switch to HEAT.
The furnace will activate an igniter which lights the main burners.
Turning Off The Furnace
Set the thermostat to the lowest temperature setting or set System Select Switch to OFF, if so equipped.
Should overheating occur or the gas control valve fail to shut off, shut off the manual equipment shutoff valve to the furnace before shutting off the electrical supply.
Extended Shutdown
1.Set thermostat to lowest temperature setting or set thermo- stat System Select Switch to OFF, if so equipped.
2.Turn Manual Equipment Shutoff Valve for furnace to OFF position (at right angle or 90_ to gas line).
3.Turn OFF electric power to the furnace at the disconnect switch or circuit breaker. (May be left ON for set-back type thermostat with batteries, provided thermostat has system select switch placed in the OFF position.)
4.Remove the burner compartment door by removing the two
(2) screws securing the door in front and lifting the door up and outwards. Removing the door will expose the gas con- trol valve knob.
5.Turn the the gas control valve to the OFF position. See Fig. 3.
6.Reinstall all doors.
Propane Gas Model Furnaces
!WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in property damage, personal injury or death.
Propane gas is heavier than air. Leaking gas could settle in low areas such as crawl space. If you suspect the presence of gas, follow the instructions on the cover of this manual.
If your propane gas furnace is installed in an excavated or low lying area, we recommend that you contact your propane gas supplier about installing a warning device that would alert you of a gas leak.
Frozen Water Pipe Hazard
!CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage
Furnace may shut down. Do not leave your home unattended for long periods during freezing weather without turning off water supply and draining water pipes or otherwise protecting against the risk of frozen pipes.
Your furnace is designed solely to provide a safe and comfortable living environment. The furnace is NOT designed to ensure that water pipes will not freeze. It is equipped with several safety devices that are designed to turn the furnace off and prevent it from restarting in the event of various potentially unsafe conditions.
If your furnace remains off for an extended time, the pipes in your home could freeze and burst, resulting in water damage. If the structure will be unattended during cold weather, you should take these precautions.
1.Turn off the water supply to the structure and drain the wa- ter lines if possible and add an antifreeze for potable water to drain traps and toilet tanks. Open faucets in appropriate areas.
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