23
close, supplying 24 VAC between terminals
“C” and “W” of the control module, which starts
combustion motor.
b. When the inducer starts, the air pressure
switch closes at -0.20”WC differential pressure
and energizes the control.
c. After a 45 second purge period, the ignitor is
energized for a 30 second warm-up period,
after which the gas valve opens.
d. The trial period for ignition is approximately
6 seconds, after which the gas valve either
remains open if fl ame is sensed, or closes if
fl ame is not sensed.
e. If fl ame is not sensed, the entire sequence
is repeated four more times before “lockout”
occurs. To reset, wait 30 seconds and then
interrupt the 24 VAC power by turning the
room thermostat below room temperature,
then returning it to the original set point.
f. If fl ame is not established on the fi fth trial for
ignition (initial try + 4 re-tries), the control
de-energizes the gas valve, fl ashes “4” on the
Status LED, and lockouts out heat operation
for 1 hour.
g. If a fl ame is present, the control energizes
the main blower on heat speed 30 seconds
after the gas valve opens.
h. When call for heat is satisfi ed the thermostat
contacts open, the gas valve shuts off gas
fl ow and the combustion blower remains on
for a 30 second post-purge period.
i. The main blower is de-energized after a 120
second blower off delay.
WARNING:
FOR YOUR SAFETY; WHAT TO DO IF
YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier,
call the fi re department.
WARNING:
Should overheating occur, or the gas
supply fail to shut off, shut off the
manual gas valve to the furnace before
shutting off the electrically 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 gé-
nérateur d’sir chaud avant de cooper
l’alimentation électrique.
OPERATING INSTRUCTIONS FOR
OIL AND GAS GUN FURNACE:
Oil Gun Model
M1 oil gun furnaces may be converted to gas
gun in the fi eld by using the proper conversion
kit listed in the RPL.
If your furnace model number begins with M1S*,
the furnace is equipped with an ignition device
which automatically lights the burner.
Do not try to light this furnace manually.
a. Open all valves in the oil line.
b. Be sure the fi re door is closed.
c. Set the On-Off switch to “ON”.
d. Set the thermostat to the desired setting.
SEQUENCE OF OPERATION FOR
OIL GUN MODELS
Oil Furnace - Honeywell R7184 / Beckett
7505 Control
1. When a call for heat is initiated, there is a
2-6 second delay while the control performs
a safe start check.
2. The ignition and motor are turned on and a
fl ame should be established within the 15-sec-
ond lockout time. NOTE: Burner will prepurge
for 15 seconds if equipped with Honeywell
R7184B or Beckett 7505 Control.
3. If fl ame is not sensed within the 15-second
lockout time, the control shuts down on safety
lockout and must be manually reset by push-
ing the reset button on the control. If control
locks over three times in a row, the control
enters restricted lockout. To reset Honeywell
R7184: Hold down the reset button for 30
seconds until the LED fl ashes twice. Beckett
7505: Hold down reset button for 15 seconds
until the red light turns off and the yellow light
turns on.
4. Once fl ame is established, the ignition remains
on 10 seconds to ensure fl ame stability. It then
turns off.
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