25
Retry
If the first ignition attempt fails during a normal heat cycle
sequence, the control will perform retry as follows:
1. The control will de-energize the gas valve.
2. The inducer will remain energized and start the inter-purge
of 30 seconds.
3. During inter-purge, if the call for heat is present and
pressure switch #1 opens, the control will display E3.2
and inter purge at max inducer speed.
4. If the call for heat is removed during inter-purge, the control
will clear the alarm and execute the remaining inter-purge
with the existing inducer speed without monitoring pressure
switch #1.
5. After the inter-purge time expires, the control turns off the
inducer and waits for the pressure switch to open before
continuing another ignition sequence. The normal ignition
sequence is restarted.
6. The control will retry 4 times before entering an External
Lockout.
7. The control will complete the inter-purge from the last
ignition attempt before going into external lockout and will
display every alarm code.
Auto Reset
When entering an external lockout of 60 minutes:
1. The blower motor will energize for 60 minutes then de-
energize.
2. Control will perform an Auto-Restart Purge.
3. Clear the Alarm
4. Perform a system reset and return to normal operation.
If the gas heat call is removed during the lockout, the control
will turn off the blower, clear the alarm, perform a system
reset and be ready for the next call.
Recycle
If the flame is detected during the trial for ignition and then lost:
1. The gas valve will be de-energized.
2. The control will turn off the inducer after post-purge and
wait for pressure switch #1 to open before continuing
another ignition sequence.
3. The blower will remain running if its already running.
Otherwise the blower will remain off.
4. Start Recycle Timer.
5. After the Recycle Timer expires, normal ignition sequence
is started without performing a pre-purge. After reaching the
max recycle count of 10, the control will go into and external
lockout, start the Auto-Restart timer and report the recycle
alarm code on the display. After the Auto-Restart Reset
timer expires, the control will exit the External Lockout.
6. The blower motor will energize for 60 minutes then de-
energize.
7. Control will perform an Auto-Restart Purge.
8. Clear the Alarm
9. Perform a system reset and return to normal operation.
If the gas heat call is removed during the lockout, the control
will turn off the blower, clear the alarm, perform a System
Reset and be ready for the next call.
Cooling Cycle
When
Y1
and
G
, or
Y1
,
Y2
and
G
signals are detected,
the control will operate in compressor cooling mode. The
Electronic Air Cleaner (EAC) relay will energize 5 seconds
after the blower is running. The EAC will be de-energized
after the blower is turned off.
1st Stage Cooling
1. When
Y1
and
G
are detected simultaneously, the control
will energize the blower with 1st stage cooling airflow and
display 1st stage cooling (
CL1
) on the display. The blower
motor does not have an on delay.
2. If
Y1
, and
G
are removed simultaneously or only
G
is
removed, the display will display “idL”.
2nd Stage Cooling
1. When
Y1
,
Y2
, and
G
are detected simultaneously, the
control will operate the blower in 2nd stage cooling speed
and display 2nd stage cooling (
CL2
).
2. If
Y1
,
Y2
and
G
are removed simultaneously or only
G
is
removed, the control will display “idL”.
Fan Mode
• When the thermostat energizes the
G
terminal for
continuous fan (without calling for heat or cool), the
indoor fan is energized on the selected FAN speed. See
,
for fan speed settings.
• If a call for cooling occurs during continuous fan, the
blower will switch over to the selected COOL speed.
• If the call for heat occurs during continuous fan, the
blower will switch over to the selected heat speed. See
page XX for the factory heat speed settings.
• A call for fan is ignored while in lockout.
MAINTENANCE
WARNING:
ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in 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. Reconnect wires correctly.
• Verify proper operation after servicing.
• Proper maintenance is most important to achieve the best
performance from a furnace. Follow these instructions for
years of safe, trouble free operation.
• These maintenance instructions are primarily intended
to assist qualified technicians experienced in the proper
maintenance and operation of this appliance.
• Always reinstall the doors on the furnace after servicing.
Do not operate the furnace without all doors and
covers in place.
• Verify the thermostat is properly installed and will not be
affected by drafts or heat from lamps or other appliances.
• To achieve the best performance and minimize equipment
failure it is recommended that a yearly maintenance
checkup be performed. At a minimum, this check should
include the following items:
