Operating Sequence Oil Heating Mode; Checks And Adjustments; Purging The Oil Line; Pressure Adjustment - Bryant OBM154 Installation Instructions Manual

items are in compliance:
1) The electrical installation, the oil supply system, the venting
system, combustion air supply and ventilation;
2) The blower access door is in place and the blower rail locking
screws are well tightened;
3) The Blocked Vent Shut-Off (BVSO) is installed according to
instructions (for chimney venting);
4) The oil supply valve is open;
5) The burner ''Reset" button is well pushed in or re-armed;
6) The preliminary air adjustments on the burner comply with the
technical specifications in this manual;
7) The blower speed adjustments for heating and air conditioning
are appropriate and according to the specifications in this
manual;
8) The blower start/stop delays are satisfactory;
9) The thermostat of the room is in the heating mode and is set
higher than the ambient temperature.
To start the unit, turn the main electrical switch on.
3.2 OPERATING SEQUENCE OIL
HEATING MODE
1) The W-R contact closes;
2) The burner motor starts up to pre-purge the combustion
chamber for a period of 10 to 15 seconds. During that time a
spark is established on the electrodes;
3) The solenoid valve opens and a flame is established. Shortly
after, the electrodes cease to spark;
4) Then the blower runs up to full speed. The delay depends on
the adjustments that were made on the electronic board, which
controls the blower motor. Refer to Sections 2.11 and 2.12
above as well as to the airflow tables 7 and 8 for more details.
5) When the call for heat is satisfied, the solenoid valve closes,
the flame goes out and the burner motor stops (after post purge
delay, if applicable).
6) The blower stops shortly after the burner. The delay depends
on the adjustments that were made on the electronic board that
controls the blower. Refer to Sections 2.11 and 2.12 above as
well as to the airflow table 7 and 8 for more details.
Note: A detailed operating sequence of the oil burner is outlined in the
instructions provided with the burner.

3.3 CHECKS AND ADJUSTMENTS

3.3.1 Purging the oil line

Open the bleed port screw and start the burner. Allow the oil to drain
into a container for at least 10 seconds. The oil should flow absolutely
free of white streaks or air bubbles to indicate that no air is being drawn
into the suction side of the oil piping and pump. Slowly close and
tighten the bleed screw. Once closed, the flame will light up.

3.3.2 Pressure adjustment

The oil pressure must be adjusted according to the Technical
Specifications of this manual. An adjustment screw and a connection
for a pressure gauge are located on the oil pump for that purpose. Also
refer to the burner instruction manual.

3.3.3 Combustion Check

IMPORTANT
The heat exchanger metal surfaces may have oil and the baffle
insulation also contains binders.
evaporate when the unit operates for the first time.
of this, the smoke reading may be inexact during the first
minutes of operation. Therefore, the unit must operate during
at least 60 minutes before taking any readings to adjust the
combustion quality. Let the unit cool down before making any
adjustments.
IMPORTANT
The combustion check verification MUST be performed after
the nozzle replacement or the burner cleaning.
manipulations, the combustion parameters are necessarily
modified. Refer also to the burner instruction manual.
1. Drill a test hole in the flue pipe, approximately 18 inches from
the furnace breech. Insert the smoke test probe into the hole.
For installation using a sidewall venting, use the orifice provided
on the breech plate;
2. From a cold start, let the unit operate for about 5 minutes;
3. Set the burner air setting until you have between 0 and 1 on the
Bacharach Scale (or a "trace");
4. Take a CO2 sample at the same test location where the #1
smoke reading was taken and make note of it. Example: 13.8%
of CO2 or 2.5% of O2;
5. the burner air setting to obtain a CO2 reading 1.5% lower (or a
O2 reading 2.0% higher) than the reading associated with the
"trace" of smoke. Example: 12.3% of CO2 or 4.5% of O2;
6. This method of adjusting the burner will result in clean
combustion (Bacharach smoke scale between 0 and a trace)
and ensure the proper functioning of the system. The optimum
CO2 level is around 12% to 13% (or 3.5% to 5.0% of O2).

3.3.4 Draft Regulator adjustment

On chimney installations only, a barometric draft regulator (supplied
with the furnace) must be installed, in order to ensure proper draft
through the furnace. The barometric damper must be mounted with the
hinge pins in a horizontal position and the face of the damper vertical
for proper functioning (see instructions included with the damper.) After
the furnace has been firing for at least five minutes, the draft regulator
should be set to between -0.025" and -0.060" W.C.
3.3.5 Overfire pressure test
The overfire draft that is taken through the observation port, located
above the burner, is a measurement necessary to determine if there
is a blockage in the heat exchanger or the flue pipe. Refer to the
Technical Specifications in this manual for overfire pressure values. A
high pressure condition may be caused by excessive combustion air,
due to the air band being too wide open, or a lack of flue draft (chimney
effect) or some other blockage, such as soot in the secondary section
of the heat exchanger or the use of an oversize nozzle input or high
pressure pump.

3.3.6 Vent Temperature Test

1. After having adjusted the burner combustion,
thermometer into the test hole in the breech pipe;
2. The total vent temperature should be between 204 and 302°C
(400 and 575°F). If not, check for improper air temperature rise,
pump pressure, nozzle size or a badly sooted heat exchanger.
9
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