Nordyne M1G, M1B, M1S, M1M owner manual Danger, Sequence Of Operation For Gas Gun Models

accomplished automatically by a silicon car- bide hot surface ignitor. A control module takes care of all lighting and timing functions. There are no external relays or timing devices.

Do not try to light this furnace manually. The control module is not field serviceable.

1.Before operation, smell all around the fur- nace for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor. If you smell gas, STOP! and follow the safety instructions below. If you don’t smell gas, go to the next step.

2.Set the thermostat to the lowest setting.

3.Turn off all electric power to the appliance.

4.This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.

5.Honeywell - push in the gas control knob and turn clockwise to “OFF.” Robertshaw - push the gas control lever to “OFF.” NOTE: The lever cannot be placed in the “OFF” position unless it is pushed in slightly. DO NOT FORCE (See Figures 30 & 31).

6.Wait ten minutes to clear out any gas. If you then smell gas, STOP! and follow the safety information on the preceding page. If you don’t smell gas, go to the next step.

7.Set the On-Off switch to the “ON” position.

8.Honeywell - turn knob on gas control counter clockwise to “ON.” Robertshaw - push the gas control lever to “ON.”

9.Turn on the electric power to the appliance.

10.Set the thermostat to “Heat” and/or the desired temperature setting. The furnace should light in approximately 45 seconds. If the appliance will not operate, follow the instructions “To Turn Off Gas To Appli- ance” and call your service technician or gas supplier.

In the event of any flashback or explosion, immediately shut off the furnace and call your service technician.

SEQUENCE OF OPERATION FOR GAS GUN MODELS

a. On a call for heat, the furnace control begins an ignition sequence which lasts approxi- mately 45 seconds.

b.After this sequence, the control module tests to see if flame is sensed. If it has, the furnace continues to heat until the thermostat is satisfied.

c.If the burner has not lit, the ignition sequence is repeated a maximum of two more times. If flame is not sensed after three attempts, the control enters “Lockout” and no further at- tempts to light the burner will occur. If “Lockout” occurs, contact a qualified service technician for assistance.

!DANGER:

Before placing the furnace in service it must be checked to make sure it is equipped for the type of gas being used. The burner flame must also be observed and adjusted if necessary. Failure to observe this caution may result in unsafe operation, explosion and/or fire, or asphyxiation. See the following sections “Gas Supply” and “Combustion Air.”

d.When call for heat is satisfied, the thermostat contacts open and the gas valve shuts off gas flow.

TO TURN OFF GAS/OIL APPLIANCE: a. Set the thermostat to the lowest setting.

b. Turn off all electric power to the appliance before servicing unit.

c. Set the On-Off Switch to “OFF.”

d. Honeywell - turn gas control knob clockwise to “OFF” Robertshaw - Push the gas control lever to “OFF.”

e. For oil, shut off all valves. f. Replace the furnace door.

THE FURNACE CONTROLS AND FUNC- TIONS

1.On-Off Switch - This switch turns electrical power to the furnace on and off. The switch must be set in the “On” position for the furnace to operate. For M1G* models, in warm weather there is a possibility of the blower coming on periodically or operating continuously due to a heat buildup within the furnace by a combination of warm weather and heat from the pilot. This is normal operation as long as there is power to the furnace and the On-Off switch is at the “ON” position. If blower operation is not desired, the On-Off switch may be set in the “OFF” position to cut the electrical power to the furnace.

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