Lennox EL296DFV Installation Instructions Manual page 61

6 Check the cleanliness of blower assembly and clean
the housing, blower wheel and blower motor if neces­
.
sary
7- Inspect the condensate drain and trap for leaks and
cracks. The drain and trap must also be cleaned and the
trap must be primed with water. Inspect the rubber
hoses connected to the pressure switches for cracks or
loose connections, replace as necessary. Remove the
rubber hoses from the cold end header box and inspect
for any blockage, clean as needed. If strainers are in­
stalled in the hoses remember to remove and clean be­
fore re­installing the hoses.
8- Evaluate the heat exchanger integrity by inspecting the
heat exchanger per the AHRI heat exchanger inspec­
tion procedure. This procedure can be viewed at
www.ahrinet.org
9- Ensure sufficient combustion air is available to the fur­
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
10 Inspect the furnace intake and exhaust pipes to make
sure they are in place, structurally sound, without holes,
blockage or leakage and the exhaust pipe is sloped to­
ward the furnace. Inspect terminations to ensure they
are free of obstructions and are structurally sound.
Inspect the furnace return air duct connection to ensure
the duct is sealed to the furnace. Check for air leaks on
supply and return ducts and seal where necessary
11 Inspect the furnace return air duct connection to ensure
the duct is sealed to the furnace. Check for air leaks on
supply 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 fur­
nace inspection to ensure proper combustion and oper­
ation. 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 dis­
connecting the indoor blower. For additional details,
please see Service and Application Note H­04­9.
2 - Verify that system total static pressure and airflow set­
tings are within specific operating parameters.
3 - Clock gas meter to ensure that the unit is operating at
the specified firing rate for each stage of operation.
Check the supply pressure and the manifold pressure
on both low fire and high fire. If manifold pressure ad­
justment is necessary, consult the Service Literature
for unit specific information on adjusting gas pressure.
Not all gas valves are adjustable. Verify correct tem­
perature rise.
Winterizing and Condensate Trap Care
1 - Turn off power to the furnace.
2 - Have a shallow pan ready to empty condensate water.
3 - Remove the clean out cap from the condensate trap
and empty water. Inspect the trap then reinstall the
drain plug.
Cleaning the Burner Assembly (if needed)
1 - Turn off electrical and gas power supplies to furnace.
Remove upper and lower furnace access panels.
2 - Disconnect the 2-pin plug from the gas valve.
3 - Remove the burner box cover (if equipped).
4 - Disconnect the gas supply line from the gas valve. Re­
move gas valve/manifold assembly.
5 - -Loosen clamps and remove combustion air intake
flexible connector (if equipped).
5 - Mark and disconnect sensor wire from the sensor. Dis­
connect plug from the ignitor at the burner box.
6 - Remove four screws which secure burner box assem­
.
bly to vest panel. Remove burner box from the unit.
7 - Use the soft brush attachment on a vacuum cleaner to
gently clean the face of the burners. Visually inspect
the inside of the burners and crossovers for any block­
.
age caused by foreign matter. Remove any blockage.
8 - Reinstall the burner box assembly using the existing
four screws. Make sure that the burners line up in the
center of the burner ports.
9 - Reconnect the sensor wire and reconnect the 2-pin
plug to the ignitor wiring harness.
10 - Reinstall combustion air intake flexible connector (if
equipped), secure using existing clamps.
11 - Reinstall the gas valve manifold assembly. Reconnect
the gas supply line to the gas valve. Reinstall the burn­
er box cover.
12 - Reconnect plug to gas valve.
13 - Replace the blower compartment access panel.
14 - Refer to instruction on verifying gas and electrical con­
nections when re-establishing supplies.
15 - Follow lighting instructions to light and operate fur­
nace for 5 minutes to ensure that heat exchanger is
clean and dry and that furnace is operating properly.
16 - Replace access panel.
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