Initial Unit Adjustments - Lennox OHR23-105 Installation Instructions Manual

OHR23−140/154 Filter Rack Installation
1. Slide filter rack over return duct flanges.
2. Using a scriber through the filter rack mounting holes,
mark seven mounting hole locations in the return end
of the cabinet. See figure 4.
3. Remove filter rack and drill 1/8" diameter holes at the
marked positions.
4. Place filter rack in position again and secure it to the
cabinet using the sheet metal screws provided. Clear-
ance for the screw driver is provided in outside holes
of rack and in filter support angles.
5. Bend the ends of filter rods and hook ends through
holes provided in top and bottom filter support angles.
6. Slide filter between the support angles and the plenum
side for the filter rack. The filter rods hold the filter in
place.
OHR23 105/120 Optional Filter Kit
22 (559)
FILTER
OPENING
(FUR-
IN UNIT
NISHED)
(EITHER SIDE)
Figure 4

Initial Unit Adjustments

Neither the nozzle setting nor the air adjustments are fac-
tory set. The furnace is fire−tested and the limit control is
checked to make sure it functions properly; no factory set-
tings are made. During installation, the furnace must be set
up. The installing dealer/contractor must have and use
proper test equipment in order to correctly set up the oil fur-
nace. Proper testing equipment is required to ensure cor-
rect operation of the unit. The use of test equipment is now
more critical than ever due to tighter tolerances needed to
keep the furnace operating efficiently.
Among the test equipment for an oil furnace, the proper
combustion test kit should contain the following:
Draft gauge
D
CO or O analyzer
D
2 2
Smoke tester
D
Pressure gauge
D
D High temperature thermometer
FILTER RACK
(FURNISHED)
14 (356)
RETURN
AIR DUCT
(NOT FUR-
NISHED
BY LENNOX)
Oil vacuum gauge
D
Beckett T−500 gauge
D
Knowledge of proper test equipment operation
D
Improper nozzle and/or air adjustment of this unit
may result in sooting problems. Refer to the follow-
ing set-up section for correct adjustment proce-
dures.
Adjusting the Nozzle
Proper adjustment of the nozzle assembly is critical be-
cause alignment may have changed during shipping. Be-
fore the furnace and oil lines are installed, the nozzle as-
sembly must be checked. This may easily be done by
removing the entire burner assembly (not just the nozzle)
from the furnace. The lower firing nozzle is factory
installed. This should be verified by the installer. Inspect
the spark transformer leads also to ensure they are still at-
tached to the electrodes.
The burner assembly is attached to the vestibule panel by
three nuts. Slots are provided in the mounting flange for re-
moving the burner assembly from the vestibule. By loosen-
ing the nuts and by turning the whole burner assembly
counterclockwise (figure 5), the entire burner assembly
will come out of the furnace. There is adequate wire to re-
move the burner without disconnecting wires. Once re-
moved, just turn the burner around in the vest panel area.
OHR23 Series Burner Removal
LOOSEN THREE NUTS WHICH AT-
TACH BURNER TO VEST PANEL.
To correctly adjust the nozzle, use a Beckett #T−500
gauge.
Insert the small end of the gauge into the end of the cone
and measure from the flat of the end cone to the tip of the
nozzle. When nozzle depth is correct, the tip of the nozzle
should just touch the end of the gauge. Refer to the illustra-
tion sheet provided with the gauge. Note that the scale side
of the gauge is not used for this purpose. Make corrections
by sliding the nozzle assembly forward or backward within
the blast tube (figure 6). At the same time, check the
nozzle alignment.
Page 6
CAUTION
ROTATE BURNER COUNTERCLOCKWISE
ON SLOTS THEN PULL TOWARD YOU.
Figure 5