Lennox o23v Benutzerhandbuch
Page 19
6−Retest the Overfire Draft
This test serves to confirm that you have not increased the air
too much. Again you do not want a positive pressure at the
test port. It should still be 0.02" w.c. (5.0 kPa) less than the
draft from the vent connector. You may need to increase the
stack draft by adjusting the barometric damper.
too much. Again you do not want a positive pressure at the
test port. It should still be 0.02" w.c. (5.0 kPa) less than the
draft from the vent connector. You may need to increase the
stack draft by adjusting the barometric damper.
NOTE − A negative heat exchanger is important in the
event of a breach (crack) in the heat exchanger. The
negative pressure along with positive pressure from
the indoor blower will pull or blow air in to the heat ex-
changer preventing combustion products or soot into
the air stream.
event of a breach (crack) in the heat exchanger. The
negative pressure along with positive pressure from
the indoor blower will pull or blow air in to the heat ex-
changer preventing combustion products or soot into
the air stream.
7−Stack Temperature
Take a stack temperature reading in the vent connector pipe.
Subtract the room air temperature from the stack temperature.
This will give you the net stack temperature. Using efficiency
charts provided in most CO
Subtract the room air temperature from the stack temperature.
This will give you the net stack temperature. Using efficiency
charts provided in most CO
2
analyzers you can tell at what ef-
ficiency the furnace is operating.
V−DISASSEMBLY PROCEDURES
Use the following procedures to access and disassemble the
burner or blower if service to either is needed.
burner or blower if service to either is needed.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
A−Disassembling Burner
The burner assembly is attached to the vestibule panel by
three nuts. Slots are provided in the mounting flange for
removing the burner assembly from the vestibule. By
loosening the nuts and by turning the whole burner as-
sembly counterclockwise (figure 19), the entire burner as-
sembly will come out of the furnace. There is adequate wire
to remove the burner without disconnecting wires. Once re-
moved, just turn the burner around in the vest panel area.
three nuts. Slots are provided in the mounting flange for
removing the burner assembly from the vestibule. By
loosening the nuts and by turning the whole burner as-
sembly counterclockwise (figure 19), the entire burner as-
sembly will come out of the furnace. There is adequate wire
to remove the burner without disconnecting wires. Once re-
moved, just turn the burner around in the vest panel area.
NOTE−Before disassembling any part of the burner, turn
off power and oil supply to the burner.
off power and oil supply to the burner.
FIGURE 19
BURNER REMOVAL
First, loosen three nuts which
attach burner to vest panel.
Next, rotate burner counterclockwise
on slots then pull toward you.
nuts
1−Removing Ignition Transformer
1− Remove all four screws located on the side of the
ignition transformer. See figure 20.
2− Lift the ignition transformer straight up. Do
not hinge back. Porcelain isolators may break if
hinged back.
hinged back.
NOTE−When testing the solid state transformer, do not
use a transformer tester designed for iron magnet trans-
formers. Damage to the tester may result
use a transformer tester designed for iron magnet trans-
formers. Damage to the tester may result
FIGURE 20
IGNITION TRANSFORMER
SCREWS
SCREWS
IGNITION
TRANSFORMER
ACCESS
DOOR
SCREW TO OPEN
ACCESS DOOR