Lennox LCH036 Installation Instructions Manual page 197

WARNING
The State of California has determined that this prod­
uct may contain or produce a chemical or chemcials,
in very low doses, which may cause serious illness or
death. It may also cause cancer, birth defects, or re­
productive harm.
B-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.
C-Burners (Gas Units)
1- Periodically examine burner flames for proper
appearance during the heating season.
2- Inspect the position of the flame sensor. Sensor should
be centered in the path of the flame.
3- Before each heating season examine the burners for any
deposits or blockage which may have occurred. Clean
burners as follows.
4- Turn off the electrical power and gas supply to the unit
and open heat section access panel.
5- Remove and retain two screws securing burners to the
burner support. See figure 58. Clean as necessary.
Replace burners and secure with retained screws.
WARNING
Danger of explosion. Can cause injury or
death. Do not overtighten main burner
mounting screws. Snug tighten only.
6- Remove and retain the two screws securing the ignitor
to the burner support. Remove the burner and check
the spark gap with appropriately sized twist drills or
feeler gauges. See figure 59.
7- Replace the ignitor and secure in place with retained
screws.
8- Restore electrical power and gas supply. Follow lighting
instructions attached to unit and use inspection port in
access panel to check flame.
507232-02 9/2015
D-Combustion Air Inducer (Gas Units)
A combustion air proving switch checks combustion air
inducer operation before allowing power to the gas
controller. Gas controller will not operate if inducer is
obstructed.
Under normal operating conditions, the combustion air
inducer wheel should be checked and cleaned prior to the
heating season. However, it should be examined
periodically during the heating season to establish an ideal
cleaning schedule. With power supply disconnected, the
condition of the inducer wheel can be determined by
removing the combustion air inducer.
BURNER BOX ASSEMBLY
BURNER
SUPPORT
REMOVE
SCREWS
TO CLEAN
BURNERS
SHOULD BE 1/8"
Clean combustion air inducer as follows:
1- Shut off power supply and gas to unit.
Page 53
GAS
VALVE
FIGURE 58
IGNITOR
SPARK GAP
(3mm)
FIGURE 59
FLAME
SENSOR
BURNERS
GAS
MANIFOLD
IGNITOR