Gas Gun; Oil Gun; Electrode Setting - Oil Gun; Switching Honeywell (R7184) Ignition From Interrupted To Intermittent - Nordyne M1MB 056 Installation Instructions Manual

Gas Gun (M1B Models)
Combustion air box adjustment is made to the main burner
by loosening the two lock nuts on the plastic air shutter,
located on the left side of the burner blower housing. Air
shutter adjustment line is located on the same side of
the blower housing. Turn the plastic shutter to a smaller
number (counter clockwise) for less air to a larger number
(clockwise) for more air. Gently tighten the lock nuts after
completing the adjustment. For best results, use instrument
to measure between 8 - 9% CO
has been adjusted. NOTE: Do not over-tighten the lock
nuts. This may damage the plastic air shutter.
Oil Gun Only (M5S Models)
It is recommended that the CO
measured for maximum performance. CO
be 10 - 11% for 66,000 BTUH furnaces and 12 - 13% for
86,000 BTUH furnaces. The Smoke should be N0. 0 on
the Bacharach Scale, and 0 to 0.02 negative draft over fi re.
Electrode Setting (Oil Gun Only)
Poor ignition of the oil spray may result if the electrodes
are not adjusted as shown in Figure 32. Do not permit
any electrodes to be grounded to any surface.
Switching Ignition Control between
Interrupted and Intermittent Duty (Oil Gun
Only)
Honeywell and Beckett oil primary controls can be switched
between interrupted and intermittent ignition control. To
switch from interrupted duty (Factory set) to intermittent
duty, remove the blue wire from the quick-connect terminal.
Attach the burner motor and igniter wire to the burner
motor (orange) control terminal by splicing or adding tab
adapters. Seal and isolate any bare wires.
5/32" GAP
5/16" ABOVE CL
0-1/16"
1 1/8"
Figure 32. Oil Gun electrode Position
24
, after the combustion air
2
and Smoke levels be
2
readings should
2
ELECTRODE
NOZZLE

OPERATING SEQUENCE

Direct Ignition Furnaces (M1M Models)

1. On a call for heat, the thermostat contacts close,
supplying 24 VAC between terminals C and W of the
control module.
2. When the inducer starts, the air pressure switch closes
at -0.20 W.C. differential pressure and energizes the
gas valve.
3. After a 45 second purge, the ignitor is energized for a 30
second warm-up period. After warm up, the gas valve
opens. NOTE: The time 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.
5. If fl ame is not sensed, the sequence repeats four more
times before a 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.
6. If fl ame does not establish on the 5th attempt (initial
fi re + 4 re-tries), the control de-energizes the gas valve,
the red LED fl ashes 4 times, and the furnace locks out
heat operation for 1 hour. See Table 9 (page 28).
7. If a fl ame is present, the control energizes the main
blower on heat speed 30 seconds after the gas valve
opens.
8. 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.
9. The main blower is de-energized after a 120 second
blower off delay.

Oil Gun Furnaces (M5S Models)

With Honeywell R7184 / Beckett 7505 Control
1. When a call for heat is initiated, there is a 2 to 6 second
delay while the control performs a safe start check.
2. The ignition and motor are turned on and a fl ame
should establish within a 15-second lockout time.
NOTE: Burner will prepurge for 15 seconds if equipped
with Honeywell R7184B or Beckett 7505B 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 pushing 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 45 seconds until
the LED fl ashes once. Beckett 7505: Hold down reset
button for 15 seconds until the red LED turns off and
the yellow LED turns on.
WARNING:
If furnace still doesn't light, turn the furnace off
as described above and call your technician. In
the event of fl ashback or explosion, immediately
shut off furnace and call your service technician.