Service - Lennox EL296DFV Installation Instructions Manual

6 - When the thermostat heating demand is satisfied, the
combustion air inducer begins a 5-second low speed
post-purge. The field-selected indoor blower off delay
begins. The indoor blower operates at the low-fire
heating speed.
1
ON
Pre-Purge
OFF
É É
1 stg heat demand
low speed CAI
ignitor
low fire gas valve
indoor blower low heat
2 stg heat demand
high speed CAI
high fire gas valve
indoor blower high heat
* Conventional thermostat 30 seconds, icomfort Touch
1
É É
ON
Pre-Purge
OFF
É É
heat demand
low speed CAI
ignitor
low fire gas valve
indoor blower low heat
7 or 12 minutes after heating demand begins, furnace switches to high fire (depending on setting)
high speed CAI
high fire gas valve
indoor blower high heat
* Conventional thermostat 30 seconds, icomfort Touch

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 opera­
tion, serious injury, death, or property damage.
Before servicing, disconnect all electrical power to
furnace.
When servicing controls, label all wires prior to dis­
connecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.
Annual Furnace Maintenance
At the beginning of each heating season, and to comply
with the Lennox Limited Warranty, your system should be
checked as follows:
HEATING OPERATION WITH TWO-STAGE THERMOSTAT
15 35
Ignitor Warm-up
30 seconds
HEATING OPERATION WITH SINGLE STAGE THERMOSTAT
15 35
Ignitor Warm-up
7 - When the combustion air post-purge period is com­
plete, the inducer and the HUM contacts are de-ener­
gized. The indoor blower is de-energized at the end of
the off delay as well as the 120V ACC terminals.
39 80
30* second
blower
Trial For
"on" delay
Ignition
RECOGNITION PERIOD
®
thermostat set for 30 adjustable 15 to 45 seconds.
FIGURE 61
39 80
30* second
blower
Trial For
"on" delay
Ignition
®
thermostat set for 30 adjustable 15 to 45 seconds.
FIGURE 62
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.
Page 60
5 SEC
Post
Purge
5 SEC
Post
Purge
WARNING
.
blower
"off"
delay
blower
"off"
delay
.