DISPLAY STATUS DESCRIPTION
FIXED
Auto diagnosis phase in which the instrument checks the effciency of its inter-
nal components. This phase is carried out each time the device is powered or
every time the burner is reignited (duration of about 2s).
FLASHING
Waiting phase in which the instrument waits for the condition to be unlocked by
the operator. It can be unlocked by the local button, remote button or by serial
communication. This phase only occurs at power on when the “Cycle start”
parameter is programmed on “Stand-by”.
FIXED
Stopping phase for adjustment requested by the thermostat. The instrument
keeps the burner off and waits for the ignition command, forces the air damper
to close and deactivates the other outputs.
FIXED
Air pressure switch waiting phase after having activated the air valve (or com-
bustion blower), or burner stop waiting for the air pressure switch during nor-
mal operation regime. This last behaviour occurs when the “Air pressure
switch” parameter is programmed on “Waiting”.
FIXED
Air damper opening phase waiting for the limit switch of the maximum position
reached or for the minimum purge flow switch (FSL) consent, to purge with
maximum air flow. This phase occurs with expansion cards when the “Air flow
or damper switch control” parameter is programmed on “Local, Remote or FSL
enable purge”, or if the function assigned to the digital input is “FSL enable
purge”.
FIXED
Chamber purging or waiting phase before burner ignition. In applications with
controlled cooling, this status indicates the phase in which only the air valve is
on. During this phase flame absence is checked otherwise lockout is determi-
ned due to illegal flame.
FIXED
Air shutter closing phase waiting for the limit switch of the minimum position
reached or for the consent from the maximum ignition flow switch (FSH) con-
sent, to carry out ignition at minimum power. This phase only occurs with
expansion cards when the “Air flow or damper switch control” parameter is pro-
grammed on “Local, Remote or FSH enable ignition”, or if the function assi-
gned to the digital input is “FSH enable ignition”.
FIXED
Check or waiting phase for signal presence from the ZSL limit switch indicating
the 1st stage gas valve closed. This phase is present just before burner igni-
tion.
FIXED
1st stage burner ignition phase, lasting the same amount of time as the first
safety time. The instrument activates the ignition transformer and 1st gas stage
solenoid valve, then at the end, deactivates the transformer and checks the
flame formation.
FIXED
1st stage burner flame stability check phase: at the end of this the instrument
checks the efficiency of the flame amplifier. This phase also occurs following a
shut down command of the 2nd stage burner.
FIXED
Regime phase for ESTRO-A, ESTRO-C and ESTRO-Q versions. For ESTRO-
B it is the 2nd stage burner ignition phase, lasting the same amount of time as
the second safety time. The instrument activates the 2nd gas stage solenoid
valve keeping the 1st gas stage on. This is a regime condition for the ESTRO-
B when the “1st stage gas outlet type” is programmed on “Intermittent”.
ESA ESTRO - E7014P rev. 02 - 03/05/17
www.esapyronics.com
8
DISPLAY AND LOCAL BUTTON SECTION
DISPLAY
ESA ESTRO displays different codes to indicate the flame control functioning and lockout statuses.
Fixed symbols indicate normal operating conditions or certain non resettable faults, whilst lock or resettable fault con-
ditions are indicated by flashing symbols.
Normal operation phases
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