Lennox MERIT Series Installation Instructions Manual page 32

6- Check the cleanliness of blower assembly and
clean the housing, blower wheel and blower motor
if necessary The blower motors are prelubricated
for extended bearing life. No further lubrication is
needed.
7- Inspect the combustion air inducer and clean if
necessary.
8- Evaluate the heat exchanger integrity by inspecting
the heat exchanger per the AHRI heat exchanger
inspection procedure. This procedure can be viewed
at www.ahrinet.org
9- Ensure sufficient combustion air is available to the
furnace. Fresh air grilles and louvers (on the unit and
in the room where the furnace is installed) must be
properly sized, open and unobstructed to provide
combustion air.
10- Inspect the furnace venting system to make sure
it is in place, structurally sound, and without holes,
corrosion, or blockage. Vent system must be free
and clear of obstructions and must slope upward
away from the furnace . Vent system should be
installed per the National Fuel Gas Code
11- Inspect the furnace return air duct connection to
ensure the duct is sealed to the furnace. Check for
air leaks onsupply and return ducts and seal where
necessary.
12- Check the condition of the furnace cabinet insulation
and repair if necessary.
13- Perform a complete combustion analysis during the
furnace inspection to ensure proper combustion
and operation. Consult Service Literature for proper
combustion values.
14- Verify operation of CO detectors and replace
batteries as required.
Perform a general system test. Turn on the furnace to
check operating functions such as the start-up and shut-
off operation.
1 - Check the operation of the ignition system, inspect
and clean flame sensor. Check microamps before
and after. Check controls and safety devices (gas
valve, flame sensor, temperature limits). Consult
Service Manual for proper operating range. Thermal
Limits should be checked by restricting airflow and
not disconnecting the indoor blower. For additional
details, please see Service and Application Note
H049.
2 - Verify that system total static pressure and airflow
settings are within specific operating parameters.
3 - Clock gas meter to ensure that the unit is operating
at the specified firing rate. Check the supply
pressure and the manifold pressure. On two-stage
gas furnaces check the manifold pressure on high
fire and low fire. If manifold pressure adjustment is
necessary, consult the Service Literature for unit
specific information on adjusting gas pressure.
Not all gas valves are adjustable. Verify correct
temperature rise.
Blower
Check the blower wheel for debris and clean if necessary.
The blower motors are prelubricated for extended bearing
life. No further lubrication is needed.
The blower door must be securely in place when the
blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into the
living space resulting in personal injury or death.
Cleaning the Burners
NOTE - Use papers or protective covering in front of the
furnace during cleaning.
1 - Turn off both electrical and gas power supplies to
furnace.
2 - Label the wires from gas valve, rollout switches,
primary limit switch and make-up box then disconnect
them.
3 - Disconnect gas supply piping. Remove the screw
securing the burner box cover and remove cover.
Remove the four screws securing the burner manifold
assembly to the vestibule panel and remove the
assembly from the unit.
4 - To clean burners, run a vacuum cleaner with a soft
brush attachment over the face of burners. Visually
inspect inside the burners and crossovers for any
blockage caused by foreign matter. Remove any
blockage. Figure 34 shows burner detail.
5 - Reinstall burner box, manifold assembly and burner
box cover.
6 - Re-install gas supply and turn on electrical pwer to
furnace.
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