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4 - After the 20-second warm-up period has ended, the
gas valve is energized and ignition occurs, which
initiates a 10-second ignition stabilization delay. At
the same time, the control module sends a signal
to begin an indoor blower 45-second ON delay.
When the delay ends, the indoor blower motor is
energized at a speed which is appropriate for the
firing rate. After the 10-second igni tion stabilization
delay expires, the inducer speed is adjusted to 35
percent speed. The integrated control also initiates
a second-stage on delay (factory-set at 7 minutes;
adjustable to 12 minutes).
5 - If the heating demand continues beyond the
secondstage on delay, the integrated control
energizes the combustion air inducer at 70 percent
speed. The indoor blower motor is adjusted to
a speed which matches the target rate. A fixed,
10-minute third-stage on delay is initiated.
6 - If the heating demand continues beyond the
thirdstage on delay, the integrated control energizes
the inducer at high speed. The indoor blower motor
is adjusted to a speed which is appropriate for the
target rate.
7 - When the thermostat heating demand is satisfied,
the gas valve is de-energized and the combustion
air inducer begins a 20-second post-purge. The
field-selected indoor blower off delay begins.
8 - When the combustion air post-purge period is
complete, the inducer is de-energized. The indoor
blower is de-energized at the end of the off delay.
Service
WARNING
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death or property
damage. Improper servicing could result in dangerous
operation, serious injury, death, or property damage.
Before servicing, disconnect all electrical power to
furnace. When servicing controls, label all wires prior to
disconnecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.
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 injury or death.
Annual Furnace Maintenance
At the beginning of each heating season, and to compl
ith the Lennox Limited Warranty, your system should be
checked as follows:
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 applicable.
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 necessary.
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 installed in the hoses remember to
remove and clean before reinstalling the hoses.
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 - On condensing furnaces, 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 toward 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
furnace inspection to ensure proper combustion
and operation. Consult Service Literature for proper
combustion values.
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