Guardian PowerVent Training Manual SVC900; Rev 1
Page 9
DEFINITIONS
• Automatic Restart Time - The period of time between a lockout and the automatic action
to initiate another ignition period. (60 minutes)
• Flame-Establishing Period - The period of time between initialization of gas flow and
proof of the supervised flame. (also called flame rectification)
• Flame Failure Response time - The period of time between loss of the supervised flame
and the action to shut off the gas supply. (The time it takes for the flame rectification
circuit to realize there is no flame and the control module shutting off the gas valve.)
• Ignition Attempts - Number of attempts in a single call for heat to ignite the gas before
locking out. The number of attempts will be zeroed if there is proof of flame for more
than 10 seconds. (3 ignition attempts)
• Ignition Activation Period - The period of time between energizing the gas valve and
deactivation of the ignition source during a trial for ignition period.
• Ignition Recycles - Number of attempts in a single call for heat to initiate gas flow if
proof of flame has been established and is then lost. (3 ignition attempts)
• Lockout - The automatic action to end an ignition sequence. Reinitiating another ignition
sequence may require a manual operation (reset).
• Pilot Flame Establishing Period - The period if time between initiation of pilot gas flow
and proof of the supervised pilot flame.
• Purge time - The period of time intended to allow for the dissipation of any unburned gas
or residual products of combustion.
o Pre-purge Time - The purge time which occurs at the beginning of heat cycle
prior to initiating ignition.
o Inter-purge Time - The purge time that takes place between the end of trial for
ignition period and reactivation of the ignition source on the multi-try system.
o Post-purge Time - The purge time which occurs at the end of a heat cycle.
• Recycle Time - The period to time between shut-off of the gas supply following loss of
the supervised ignition source or the supervised main burner flame and the reactivation of
the ignition source.
• Set Point - A selectable temperature set by the user. Temperature selection is made by
rotating the red knob on the face of the gas control valve.
• Temperature Differential - The temperature difference between when the thermostat is
satisfied and a call for heat. Usually expressed in +/- from temperature setting.
• Trial for Ignition Period - The period of time between energizing and de-energizing the
gas valve, if proof of supervised flame is not established.
•
Valve Sequence Period - The sum of all trial for ignition periods prior to lockout, if proof
of the supervised flame is not established.
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