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3 OPERATION
3.1
START-UP
Before starting up the unit, be sure to check that the following 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 the corresponding heating speed.
The delay and the fan speed depends on the settings that were
made on the electronic board and or at the fan motor (4 speeds
motor). Refer to Sections 2.9.2 and 2.9.3, as well as the CFM
tables 8 and 9 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 setting that were made on the electronic board that controls
the blower. Refer to Sections 2.9.2 and 2.9.3 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
CAUTION
The heat exchanger metal surfaces may have oil and the insulation in
the sound trap assembly also contains binders. These products will
burn or evaporate when the unit operates for the first time. Because of
that, the smoke reading may be skewed 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.
The combustion check verification MUST be performed after the
nozzle replacement or the burner cleaning. After these
manipulations, the combustion parameters are necessarily
modified. Refer also to the burner instruction manual.
1.
Pierce 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 CO
sample at the same test location where the
2
''trace'' of smoke reading was taken and make note of it.
Example: 13.8% of CO
5.
Adjust the burner air setting to obtain a CO
lower (or a O
2
associated with the ''trace'' of smoke. Example: 12.3% of
CO
or 4.5% of O
2
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 CO
level is around 12% to 13% (or 3.5% to 5.0%
2
of O
).
2
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, insert a
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. Also refer to section 2.5 for proper
flue pipe sizing.
Low flue gas temperature increases the risk of condensation.
Adjust the total flue gas temperature at or higher then 204°C
(400°F) in order for the heat exchanger warranty to remain in
force.
9
IMPORTANT
or 2.5% of O
;
2
2
reading 1.5%
2
reading 2.0% higher) than the reading
;
2
CAUTION
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