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5. The circulating air blower will energize after
the temperature fan switch closes.
6. The furnace runs until the call for heat is
satisfi ed.
7. The circulating air blower will de-energize
when the temperature fan switch opens.
WARNING:
If furnace still does not light, turn the
furnace off (described above) and call
your technician. In the event of any
fl ashback or explosion, immediately
shut off furnace and call your service
technician.
Gas Gun Models
M1 gas gun furnaces may be converted to oil
gun in the fi eld by using the proper conversion
kit listed in the RPL.
If your furnace model number begins with M1B*,
the furnace does not have a pilot. Ignition is
accomplished automatically by a silicon carbide
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 fi eld service-
able.
1. Before operation, smell all around the furnace
for gas. Be sure to smell next to the fl oor
because some gas is heavier than air and will
settle on the fl oor. 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” posi-
tion 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 appli-
ance.
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 Appliance”
and call your service technician or gas sup-
plier.
In the event of any fl ashback 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 approximately
45 seconds.
b. After this sequence, the control module tests
to see if fl ame is sensed. If it has, the furnace
continues to heat until the thermostat is satis-
fi ed.
c. If the burner has not lit, the ignition sequence
is repeated a maximum of two more times.
If fl ame is not sensed after three attempts,
the control enters “Lockout” and no further
attempts to light the burner will occur. If
“Lockout” occurs, contact a qualifi ed 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 fl ame must also be
observed and adjusted if necessary.
Failure to observe this caution may
result in unsafe operation, explosion
and/or fi re, or asphyxiation. See the
following sections “Gas Supply” and
“Combustion Air.”
d. When call for heat is satisfi ed, the thermostat
contacts open and the gas valve shuts off gas
fl o w .
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.
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