The heat sensing switch performs as the furnace high temperature limit switch. If the furnace overheats for any reason, the limit switch opens, breaking the circuit to the burner. The blower motor will be energized and as the unit cools the limit switch will close. This relights the burner, however, unless the overheating condition is corrected, the furnace will continue to cycle on limit.
This unit is equipped with an interrupted ignition elec- tronic control. If the main burner does not ignite within 30 sec from the call for heat, the control will lock out. The red button on top of the control must be depressed for 3 sec in order to reset the control. The control CAN- NOT be reset from the room thermostat.
1.This appliance is equipped with an ignition device which automatically lights the burner. Do NOT try to light the burner by hand.
2.After preparing the furnace for heating operation (See previous section.) and checking for proper oil supply, proceed as follows.
3.For a heating/cooling system, set the thermostat to HEAT and the fan to AUTO. Set the thermostat to the desired room temperature and turn on the electrical power to the furnace.
4.The burner should light and the system should be controlled by the thermostat.
HEATING
Preparing Furnace For Operation
Before attempting to put your furnace into operation for the heating season, you should perform the following procedures.
!WARNING
If you do not follow these instructions exact- ly, a fire or explosion may result causing property damage, personal injury, or loss of life.
1.Open all warm air registers and make sure that all
2.If a humidifier is installed with your system, open the water supply valve.
3.Set the thermostat to its lowest setting.
4.Turn on electric power to the furnace.
5.Open the oil supply valve.
6.Check all connections to ensure there are no leaks.
Turning Off Your Furnace
Follow these simple procedures to put your furnace into retirement for the summer.
1.Set the thermostat to the lowest setting.
2.Turn off all electrical power to the appliance.
3.Turn the oil supply off.
4.If applicable, turn off water supply to humidifier.
5.If furnace blower will be necessary for cooling sys- tem, remember to turn electrical power back on when needed for air conditioning.
MAINTAINING YOUR UNIT
In order to keep your furnace running properly and at the efficiency for which it was designed, the furnace MUST be inspected and serviced once a year. Lack of yearly service could lead to poor furnace performance and damage to the furnace.
Here are the things you should do and have your service technician do for you.
Homeowner:
1.Inspect and clean filter.
2.Make sure the following areas are clear: A. Outlet and return registers.
Lighting Your Furnace
!CAUTION
This furnace is equipped with an interrupted type electronic ignition system. DO NOT AT-
TEMPT TO LIGHT WITH A MATCH.
!DANGER!
HIGH VOLTAGE AT IGNITOR.
B. Air openings to furnace and furnace area.
C. Chimney or flue exhaust.
3. Set up yearly service.
Technician:
Minimum yearly service should include the following:
1.Check flue and secondary tube passage ways includ- ing chimney — clean if necessary.
2.Change oil filter.
3.Change nozzle.
4.Check and adjust combustion and draft.
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