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• Ignition Activation Period (IAP): The period between
energizing the main gas valve and deactivation of
the ignition source prior to the end of TFI.
• Flame Recognition Period (FRP): The period between
deactivation of the ignition source and the expira-
tion of the TFI.
• Flame Failure Response Time (FFRT): The period
between loss of the supervised main burner flame
and the action to shut off the gas supply.
• Igniter Warm-up Time: The length of time allowed
for the hot surface igniter to heat up prior to the
initiation of gas flow.
• Pre-purge Time: The period of time intended to al-
low for the dissipation of any unburned gas or re-
sidual products of combustion at the beginning of a
furnace operating cycle prior to initiating ignition.
Beginning from the moment the pressure switch is
sensed closed and lasting until the ignition source is
energized.
• Inter-purge Time: The period of time intended to
allow for the dissipation of any unburned gas or re-
sidual products of combustion, just prior to initiating
ignition retries during the Ignition Retries sequence.
• Post-purge Time: The period of time to allow for the
dissipation of any unburned gas or residual products
of combustion at the end of a furnace burner operat-
ing cycle. Post-purge begins at the loss of flame
sense.
• Ignition Stabilization Period – The period between
sensing of the main burner flame and the transition
from the Ignition Firing Rate to the Target Firing Rate.
• Ignition Recycles: The additional attempts within the
same thermostat cycle for ignition after loss of the
supervised ignition source or the supervised main
burner flame.
• Ignition Retries: The additional attempts within the
same thermostat cycle for ignition when the super-
vised main burner flame is not proven within the Trial
for Ignition Period.
• Low Fire Rate: The lowest firing rate the IFC con-
trols to during a heating cycle.
• High Firing Rate: The maximum firing rate that an
installed appliance can attain based on manifold ori-
fices and the high pressure switch setting.
• Ignition Firing Rate: The target firing rate at which
the appliance always lights off. The appliance stays
at this firing rate until the Ignition Stabilization Pe-
riod expires. It then moves to the target firing rate
called for by the operating sequence.
• Target Firing Rate: The firing rate that the IFC con-
trols the inducer to attain at a given time in the op-
erating sequence.
• Heat Fan On Delay: The period between proof of the
supervised main burner flame and the activation of
the blower motor at the low heat speed.
• Heat Fan Off Delay: The period between the loss of
supervised main burner flame after the call for heat
has ended and the deactivation of the blower motor.
• 2
nd
Stage On Delay: This applies to systems config-
ured for 1-stage thermostats. The length of time
operating in normal low fire mode before switching
to mid fire mode.
• Auto Restart Delay: The time delay waited before
the control is able to perform a new trial for ignition
in the case of Soft Lockout.
• Soft Lockout: A state caused a system fault such as
loss of flame or pressure switch failure .
• Hard Lockout: A state caused by a failure internal to
the control or by a system fault such as a flame rollout
• Fault Debouncing Time: The period between a sys-
tem fault occurring and the IFC recognizing the fault
has occurred. This time varies depending on the spe-
cific fault.
• Factory Shared Data: Data used by a ClimateTalk™
device for specific configuration parameters. This
data will be programmed in at the factory.
Heat Exchanger Prepurge 15 sec ---
HSI Warm Up 17 sec Same for all trials
Ignition Activation Period 3 sec ---
Flame Recognition Period 1 sec ---
Trial For Ignition 4 sec TFI = IAP + FRP
Gas Valve Sequence Period 12 sec ---
Ignition Stabilization Period 10 sec ---
Flame Debounce Period 2 sec
Time it takes to debounce
flame presence or failure
Post-purge 29 sec ---
Inter-purge 30 sec ---
Auto Restart Delay 60 min ---
Ignition Retries 2 3 trials total
Ignition Recycles – Flame Failure 2 3 flame losses total
Flame Failure Response Time 2 sec max @ 1uA
Other Parameters
---
Low Fire Rate 35% % of target high fire rate
Ignition Fire Rate 80% % of target high fire rate
High Fire Rate 100% ---
Ignition Activation Chart
OPERATION
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