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Term
Location
Definition
Value
Pre-purge Time
N/A
Time intended to allow for the dissipation of any unburned
gas or residual products of combustion at the beginning of
a furnace operating cycle prior to initiating ignition.
15 sec
Adaptive Ignitor Warm
up time
N/A
Adaptive algorithm that adjusts the duration of ignitor
warm-up for the purpose of extending ignitor life. Following
application of power, the warm-up time will be 17 seconds
for the first 64 successful ignitions. Each subsequent warm-
up time will be decreased by 1 second until flame fails to
be achieved (resulting in a retry) or until the minimum 5
second warm-up period is achieved
17-19 sec
Trial for Ignition
Period (TFI)
N/A
The period of time between initiation of gas flow and the
action to shut off the gas flow in the event of failure to
establish proof of the supervised ignition source or the
supervised main burner flame.
4 sec
Ignition Activation
Period (IAP)
N/A
Time between energizing the main gas valve and
deactivation of the ignition means prior to the end of TFI.
3 sec
Flame Failure
Response Time (FFRT)
N/A
Time between loss of the supervised main burner flame
and the action to shut off the gas supply.
2 sec
Recycles
N/A
The additional attempts within the same thermostat cycle
for ignition after loss of the supervised ignition source or
the supervised main burner flame.
5 attempts
Retries
N/A
The additional attempts within the same thermostat cycle
for ignition when the supervised main burner flame is not
proven within the first trial for ignition period. The retry
sequence will follow the inter-purge time.
4 attempts
Inter-purge
N/A
Time intended to allow for the dissipation of any unburned
gas or residual products of combustion between the failed
trial for ignition and the retry period.
60 sec
Post-purge Time
N/A
Time intended to allow for the dissipation of any unburned
gas or residual products of combustion at the end of a
furnace burner operating cycle. Post-purge begins at the
loss of flame sense.
5 sec
Auto Restart
N/A
After one (1) hour of internal or external lockout, the control
will automatically reset itself and go into an auto restart
purge for 60 seconds.
60 min
Heat On Delay
N/A
Time between proof of the supervised main burner flame
and the activation of the blower motor at Heat speed.
45/30* sec
Heat Off Delay
N/A
Time between the loss of a call for heat and the
deactivation of the blower motor at Heat speed.
60/90/120*/
180 sec
Cool On Delay
N/A
Time between a thermostat demand for cool and
energizing the circulator blower motor at Cool speed.
2 sec
Cool Off Delay
N/A
Time between the loss of a call for cool and the
deactivation of the blower motor at Cool speed.
60*/2 sec
* = Default
DEFINITION OF TERMS
& TIMING SPECIFICATION
