ESA ESTRO - E7014P rev. 02 - 03/05/17
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19
PARAMETER
VALUE DESCRIPTION
N° NAME
12
Air flow
control type
Discontinue
delayed 5 sec
The instrument maintains the same behaviour as when “Discontinue
delayed 0 sec” is selected, with the difference being that from the valve
closing command, it waits for 5 seconds before moving onto burner igni-
tion, giving the valve time to close.
Discontinue
delayed 10 sec
The instrument maintains the same behaviour as when “Discontinue
delayed 0 sec” is selected, with the difference being that from the valve
closing command, it waits for 10 seconds before moving onto burner igni-
tion, giving the valve time to close.
13
Digital input
function
Inhibited The state of the digital input is not checked by the instrument.
Reset / Stop
The digital input has a dual function: with burner on as soon as it activa-
ted it leads to manual stop; whilst with burner in stop or lockout, if activa-
ted from 1 to 3 seconds when released, burner lockout is activated. The
instrument accepts 5 reset commands from remote in 15 minutes.
Only stop
The digital input is checked by the instrument only with burner running:
as soon as it is activated it leads to burner manual stop.
Only reset
The digital input is checked by the instrument only with burner in stop or
lockout: if activated from 1 to 3 seconds, when released burner lockout
is activated. The instrument accepts 5 reset commands from remote in
15 minutes.
Thermostat
The digital input works as a thermostat alternatively at the expansion
input: with input on, the instrument switches the burner on, whilst when
the input is not on, it determines shut down. This configuration is possi-
ble if the EXP-2 expansion card is not installed.
High
temperature
The digital input is used to activate high temperature functioning. This
selection is possible only for certain industrial applications where it is
allowed according to the EN746-2 and in the “High temperature function”
parameter, the instrument behavior is defined when this configuration is
present.
Main burner
on / off
The digital input controls the 2nd gas stage as an alternative to the serial
commands: with input on and 1st gas stage burner running, the instru-
ment switches on the 2nd gas stage burner; whilst with input off, it deter-
mines second gas stage burner shut down.
Air valve
on / off
The digital input controls the air as an alternative to the serial commands:
with input on and 1st gas stage burner running the instrument activates
the air; whilst with input deactivated, it determines shut down. This fun-
ction is valid only when the type of air control is discontinuous or impul-
sive.
FSL
enable purge
Via the flow switch (FSL) the digital input checks the presence of the
minimum air flow needed to time purging, as an alternative to the expan-
sion input. This configuration avoids the EXP-2 expansion card as it is
necessary to check just this command. The appropriately programmed
digital output, will supply the phase to the flow switch.
FSH
enable ignition
Via the flow switch (FSH) the digital input checks the correct air flow for
burner ignition, as an alternative to the expansion input. This configura-
tion avoids the EXP-2 expansion card as it is necessary to check just this
command. The appropriately programmed digital output, will supply the
phase to the flow switch.
Air pressure
switch
The digital input functions as an air pressure switch as an alternative to
the expansion input. This configuration avoids the EXP-2 expansion card
as it is necessary to check just this command. The instrument behavior
depending on the pressure status, is always defined in the “Air pressure
switch” parameter (parameter n° 27). The appropriately programmed
digital output, will supply the phase to the pressure switch.
ZSL Gas valve
Before carrying out ignition the instrument checks the presence of the
closed gas valve limit switch signal via the digital input. After the ignition
phase the device checks that the signal disappears. The digital output
programmed appropriately, will supply the phase to the limit switch.
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