York 363857-YUM-A-0208 manual Safety Information, System Operation, For Your Safety, Thermostats

363857-YUM-A-0208

SAFETY INFORMATION

FOR YOUR SAFETY

•Make sure that the furnace area is clear and free of com- bustible materials, gasoline and other flammable vapors and liquids.

•Be sure the furnace is free and clear of insulating mate- rial. Examine the furnace area after installation of the fur- nace or the installation of additional insulation. Some types of insulation are combustible.

•For proper operation of this furnace, air for combustion and ventilation is required. Make sure that these open- ings are not obstructed.

•For lighting or shutting down this furnace, refer to the lighting instructions provided adjacent to the burners and also located in this manual.

•A blocked vent roll-out switch is provided in the burner compartment. This switch is a manual reset. If the fur- nace fails to operate, contact a qualified service techni- cian.

•Should the gas supply fail to shut off or if overheating occurs, shut off the gas valve to the furnace before shut- ting off the electrical supply. Then call a qualified service technician.

•Do not use this furnace if any part has been under water. A flood-damaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explo- sion. A qualified service technician should be contacted to inspect the furnace and to replace all gas controls, control system parts, electrical parts that have been wet or the furnace if deemed necessary.

•Determine the integrity of the installation regarding the flue gas vent, the return and supply air duct. Confirm the equipment is well supported and there are no signs of deterioration. The manufacturer recommends that main burner, ignition device and controls are inspected by a qualified service technician before each heating season.

SYSTEM OPERATION

THERMOSTATS

Set your thermostat for either heating or cooling then set it for the desired temperature. DO NOT MOVE THE THERMO-

STAT RAPIDLY ON AND OFF, OR BACK AND FORTH FROM HEAT TO COOL. THIS COULD DAMAGE YOUR EQUIPMENT.

Always allow at least 5 minutes between changes. Find the temperature that is most comfortable to you, and then LEAVE YOUR THERMOSTAT ALONE. (Exception is for night or vacation “set back” to conserve energy).

Manually moving the thermostat up or down will not speed up temperature changes in your rooms. This only causes the thermostat switch to function at your command rather than responding to room temperature.

Heat generated by devices other than the furnace may inter- fere with thermostat performance. Therefore, lamps, radios, television sets, etc. should not be placed near the thermostat.

FIGURE 1 - TYPICAL THERMOSTAT

INTERMITTENT IGNITION DEVICE

Your unit is equipped with a cycling spark ignition device. It has a Relight control designed to automatically light the burn- ers each time the thermostat controller “calls” for heat.

This furnace is equipped with an intermittent spark and automatic re-ignition system. Do Not attempt to manually relight the pilot. Personal injury could result.

When the controller calls for heat, gas is supplied to the Inte- gral Crossover Burners and at the same time, sparking occurs to light the main burner gas. A flame sensor closes a circuit to the ignitor control which proves that all of the burn- ers have ignited properly.

On initial start-up, air may be in the gas lines. Several tries for ignition may be required before the gas will carry over and the heat sections remains lit. The ignition model has 3 trials for ignition. If the ignition module locks out, it may be neces- sary to remove re-establish the call for heat W1 or W2 to con- tinue the purging process.

When the controller is satisfied, the electrical circuit to the gas valve is opened, closing off the flow of gas to the main burner.

If the burners should fail to light, contact your heating con- tractor or gas company for service to insure that proper oper- ating conditions are restored.

In the event that gas to the main burner has been shut-off, DO NOT attempt to place the furnace into operation. Call the appropriate service agency.

2 Johnson Controls Unitary Products