Lennox EL280UHE Series Unit Information page 30

VI-MAINTENANCE
Annual Furnace Maintenance
At the beginning of each heating season, and to comply
with the Lennox Limited Warranty, your system should be
checked by a licensed professional technician (or equiva­
lent) as follows:
WARNING
Disconnect power before servicing unit.
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dan­
gerous operation. Verify proper operation after ser­
vicing.
WARNING
The blower access panel must be securely in place
when the blower and burners are operating. Gas
fumes, which could contain carbon monoxide, can
be drawn into living space resulting in personal inju­
ry or death.
1- Check wiring for loose connections, voltage at indoor
unit and amperage of indoor motor
2- Check the condition of the belt and shaft bearings if ap­
plicable.
3- Inspect all gas pipe and connections for leaks
4- Check the cleanliness of filters and change if necessary
(monthly).
5- Check the condition and cleanliness of burners and
heat exchanger and clean if necessary.
6- Check the cleanliness of blower assembly and clean
the housing, blower wheel and blower motor if neces­
.
sary The blower motors are prelubricated for extended
bearing life. No further lubrication is needed.
7- Inspect the combustion air inducer and clean if neces­
sary.
8- Evaluate the heat exchanger integrity by inspecting the
heat exchanger per the AHRI heat exchanger inspec­
9- Ensure sufficient combustion air is available to the fur­
10 Inspect the furnace venting system to make sure it is in
11 Inspect the furnace return air duct connection to ensure
12 Check the condition of the furnace cabinet insulation
13 Perform a complete combustion analysis during the fur­
14 Verify operation of CO detectors and replace batteries
.
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
2 - Verify that system total static pressure and airflow set­
3 - Clock gas meter to ensure that the unit is operating at
Page 30
tion procedure. This procedure can be viewed at
www.ahrinet.org
nace. 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
place, structurally sound, and without holes, corrosion,
or blockage. Vent system must be free and clear of ob­
structions and must slope upward away from the fur­
.
nace Vent system should be installed per the National
Fuel Gas Code
the duct is sealed to the furnace. Check for air leaks on
supply and return ducts and seal where necessary
and repair if necessary.
nace inspection to ensure proper combustion and oper­
ation. Consult Service Literature for proper combustion
values.
as required.
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 dis­
connecting the indoor blower. For additional details,
please see Service and Application Note H­04­9.
tings are within specific operating parameters.
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 ad­
justable. Verify correct temperature rise.
.