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Operating Instructions for Direct Ignition
Models M1M
Direct ignition furnaces do not have a pilot. Ignition
is accomplished by a silicon carbide hot surface
ignitor. A control module takes care of all timing
functions. After lighting, the control module uses
the ignitor as a fl ame sensor, shutting off gas
should the fl ame go out. There are no external
relays or timing devices. Do not try to light this
furnace by hand. The control module is not
fi eld serviceable.
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance.
3. Remove the furnace door and turn off the gas
valve:
• Honeywell: push in and turn the gas control
knob clockwise to OFF (Figure 32)
• Robertshaw: push the gas control lever to
the OFF position (Figure 33). Do not force!
4. Wait ten (10) minutes to clear out any gas. If
you smell gas, STOP! and follow the Safety
Information on page 19. If you do not smell
gas, proceed to next step 5.
5. Set the thermostat MODE the ON position.
6. Turn the gas valve ON:
• Honeywell: push in and turn gas control
knob counter-clockwise to ON (Figure 32).
• Robertshaw: push the gas control lever to
the ON position (Figure 33). Do not force!
7. Replace the furnace door.
8. Turn on all electric power to the appliance.
9. Change the thermostat mode to HEAT and the
temperature selector to a desired temperature
level. The igniter should light in approximately
75 seconds. If the appliance will not operate,
see “How To Shut Off Gas - Direct Ignition” and
call your service technician or gas supplier.
NOTE: In the event of any fl ashback or explosion,
immediately shut off the furnace and call your
service technician.
12. Set the thermostat mode to HEAT or a desired
temperature setting and then ON.
WARNING:
Close the hinged fi re door. If door
is left open or spring is broken it
may allow products of combustion
into the living space by the furnace
blower, resulting in possible
asphyxiation.
13. Replace the furnace door.
NOTE: In the event of any fl ashback or explosion,
immediately shut off the furnace and call your
service technician.
WARNING:
Should overheating occur, or the gas
supply fails to shut off, shut off the
manual gas valve to the furnace before
shutting off the electrical supply.
AVERTISSEMENT:
En case de température excessive,
ou sail est impossible de cooper
l’alimentation en gaz, fermer le
robinet manuel d’alimentation en gaz
du générateur d’sir chaud avant de
cooper l’alimentation électrique.
How to Shut Off Gas - Standing Pilot
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance at
the breaker or fuse box.
3. Remove the furnace door.
4. Push in the gas control lever and move to the
left to the OFF position. DO NOT FORCE!
5. Replace the furnace door.
Figure 32. Direct Ignition
Gas Valve - Honeywell
GAS CONTROL KNOB
Figure 33. Direct Ignition
Gas Valve - Robertshaw
Gas Control Lever