Service Manual

45
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 Goodman 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
Ignition Retries:
When flame is not sensed during the Trial for Ignition Pe-
riod:
The valve is de-energized.
The inducer remains energized at ignition speed dur-
ing the Inter-purge Period.
The circulator if already running remains energized
at the current CFM for the circulator fan off delay
period.
When the Inter-purge Period expires, the control pro-
ceeds to the HSI Warm-up and then a new Trial for
Ignition is started again for up to a maximum of two
additional trials (3 attempts total). After the third
Trial for Ignition has failed to light the burner the IFC
proceeds to Soft Lockout through the Post-purge
where the inducer remains energized at the ignition
OPERATION