Page 6
Servicing Filter
Units are equipped with the number of filters shown in
table 1. Filters should be checked monthly and replaced
when necessary with filters of like kind and size. Take note
of air flow direction marking on filter frame when
reinstalling filters. See figure 7.
REMOVE FILTERS
PULL TO REMOVE
FILTERS
FIGURE 7
NOTE − Filters must be ULC approved or equivalent for
use in Canada.
TABLE 1
NUMBER AND SIZE OF FILTER BY UNIT
LGA/LGC Unit
Qty Filter Size − inches (mm)
036, 042, 048, 060, 072
2
16 X 25 X 2 (406 X 635 X 51)
090, 102, 120, 150
4
18 X 24 X 2 (457 X 610 X 51)
156, 180, 210, 240, 300S
6
24 X 24 X 2 (610 X 610 X 51)
248, 300H, 360
12
20 X 20 X 2 (508 X 508 X 51)
Lubrication
All motors are lubricated at the factory. No further
lubrication is required.
Blower shaft bearings are prelubricated. For extended
bearing life, relubricate at least once every two years
with a lithium base grease, such as Alvania 3 (Shell Oil),
Chevron BRB2 (Standard Oil) or Regal AFB2 (Texas
Oil). Use a hand grease gun for relubrication. Add only
enough grease to purge through the bearings so that a
bead of grease appears at the seal lip contacts.
Manifold Pressures
Manifold pressures are shown in table 2. Refer to figures
2, 3, and 4 to locate pressure ports.
TABLE 2
MANIFOLD PRESSURES
in.wg. (kPa)
Natural Gas
Propane (LP) Gas
LGA/LGC Unit
1st Stg.+
0.2(+.05)
2nd Stg.+
0.3 (+.08)
1st Stg.+
0.2 (+.05)
2nd Stg.+
0.3 (+.08)
036, 042, 048, 060,
072 Std./High Heat
NA
3.5
(0.87)
NA
10.5
(2.61)
036, 042, 048, 060,
072 Dual Heat
1.9
(0.47)
3.5
(0.87)
5.3
(1.32)
10.5
(2.61)
090 through 360
1.6
(0.40)
3.7
(0.92)
5.5
(1.37)
10.5
(2.61)
Burners
Clean the burners as follows:
1− Turn off the electrical power and the gas supply to the
unit.
2− Open or remove the burner compartment access
panel.
3− Remove two screws securing burners to burner
support and lift the burners from the orifices. See
figure 8. Clean as necessary. Spark gap on ignition
electrode must be properly set. Refer to the Heating
Adjustment section in the installation instructions.
4− Replace burners and screws securing burner.
Replace the burner compartment access panel.
5− Turn on the electrical power and the gas supply to the
unit. Follow the operating instructions attached to the
unit and use the inspection port in the access panel
to check the flame.
BURNER BOX ASSEMBLY
FIGURE 8
GAS MANIFOLD
FLAME
SENSOR
GAS
VALVE
BURNERS
