Lennox International Inc. o23v - Manual (Page 18)

Page 18
FIGURE 18
OIL PUMP PRESSURE CHECK
**TO ADJUST PRESSURE: INSERT STANDARD SCREWDRIVER.
TURN COUNTERCLOCKWISE BELOW DESIRED PRESSURE,
THEN TURN CLOCKWISE TO SET DESIRED PRESSURE.
**REGULATE PRESSURE
NOT SHOWN
(beside the inlet port)
D−Burner Adjustment
The following instructions are essential to the proper opera-
tion of O23V series oil furnaces. To prevent sooting, these
instructions must be followed in sequence:
NOTE−All w.c. measurements are below atmospheric
pressure (negative readings).
CAUTION
Failure to adjust burner properly will result in
sooting.
1−Draft
This test should be taken at the outlet of the vent pipe from
the furnace and the barometric damper. Generally a 1/4" (6
mm) hole will need to be drilled for the draft gauge to be
inserted into the vent connector.
A minimum of 0.03" w.c. (7.5 Pa) draft must be estab-
lished without the burner in operation. With the burner in
operation, the draft should be 0.04" w.c. (9.9 Pa) to 0.05"
w.c. (12.4 Pa). This is VERY critical to the flame retention
head burners.
Oil furnace installations also require careful inspection to
make sure the chimney is in good condition and can ac-
commodate the products of combustion. The temperature
in unconditioned space will also affect the draft if long vent
connectors are allowed to get too cold.
2−Overfire Draft
This test should be taken with the burner in operation.
Remove the screw from the center of the center inspec-
tion port. Insert your draft gauge into the hole.
A reading of the overfire draft should be 0.02" w.c. (5.0 Pa)
less than the reading found in the vent connector. If a posi-
tive reading is seen at this point, the secondary heat ex-
changer may be sooted or to much air may be entering
into the heat exchanger from the combustion fan. Adjust-
ments to the combustion fan can be made using the air
adjustment dial.
3−Smoke Test
The smoke test should be taken at hole drilled in step 1.
Using a smoke test gun adjust the air inlet shutter so that
you will have just a trace of smoke. Somewhere be-
tween a 0 and #1 smoke. This is the starting point. Do
not stop here. After the smoke test take a CO sample.
C.S.A. requires no more than 400ppm. However, a
properly installed unit under normal operating condi-
tions should not read more than 50ppm.
4−CO
2
Test
Again to be taken at the vent connector pipe. With the
unit firing at a trace of smoke, test for percentage of CO
2
in the vent gas.
From the results of this test, a window of operation" will be
determined. This window of operation establishes some tol-
erance. The tolerance the installer builds in provides room
within the set-up for those things which might affect com-
bustion. Those things which might affect combustion can
then do so without causing the unit to start sooting/smoking.
Things which might affect combustion include a nozzle go-
ing bad, draft that changes during different climatic condi-
tions, dirty oil, dirt obstructing the air inlet, etc.
To build in a window of operation," set up the burner to be
2% less in CO
2
. For example, if you find a reading of 12%
CO
2
, adjust the air inlet shutter to increase the air and drop
the CO
2
to 10%.
5−Retest the Smoke
With a drop in the CO
2
and increase in the air you should
see that the smoke has returned to 0.