ESA ESTRO - E7014P rev. 02 - 03/05/17
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18
PARAMETER
VALUE DESCRIPTION
N° NAME
7
Behaviour at
flame failure
Respark
The instrument performs burner reignition (excluding prepurge) after the
flame signal has disappeared. When burner ignition has taken place cor-
rectly, at the next flame extinction, the instrument performs another rei-
gnition sequence.
Only one
recycle
The instrument performs a sequence of complete ignition (including pre-
purge) after the flame signal has disappeared. When burner ignition has
taken place correctly, at the next flame extinction, the instrument per-
forms burner lockout halt (reset is required).
Only one
respark
The instrument performs burner reignition (excluding prepurge) after the
flame signal has disappeared. When burner ignition has taken place cor-
rectly, at the next flame extinction, the instrument performs burner loc-
kout halt (reset is required).
9 Postpurge flex
Inhibited
The instrument begins timing of the “Post purge time” from burner shut
down due to a shut down request or lockout.
Enable
The instrument begins timing of the “Post purge time” from the burner
ignition phase. When this configuration is present, the “Postpurge time”
becomes the minimum time between one burner ignition and the next.
10 Postpurge time
0 ÷ 99 sec
2 ÷4 min
Chamber purge or waiting time before another ignition after burner shut
down. During the postpurge phase the instrument does not accept any
other command; whilst in applications with air damper control, during this
phase the damper is commanded to open. Enabling the “Postpurge flex”
function this time becomes the minimum time between one burner igni-
tion and the next.
12
Air flow
control type
Continue
The instrument activates the air valve (or blower) from the ignition
request and keeps it on until burner shut down due a request or lockout.
This selection is necessary when the output has to be on for the entire
prepurge cycle and burner operation because it controls the combustion
blower or air interception valve. When this configuration is present, the
“Air on “ and “Air off” commands have no effect.
Discontinue
delayed 0 sec
The instrument activates the air valve from the ignition request until the
end of the purging phase. It deactivates the valve by passing instantane-
ously to the ignition phase and then activates it from the end of the
“Regulation delay time” until the burner shuts off due to a shut down
request or lockout. This selection is useful in applications having an air
partializing valve that must be activated for controlled prepurge or coo-
ling.When there is this configuration, the “Air on” and “Air off” commands
have effect from the end of the “regulation delay time”.
Pulse
The instrument activates the air valve from the end of the “regulation
delay time” until the burner shuts off due to a shut down request or loc-
kout. This selection is useful in applications having an air partializing
valve but that don’t need to be activated for controlled prepurge or coo-
ling. When there is this configuration, the “Air on” and “Air off” commands
have effect for air valve control purposes.
Remote
The instrument activates the air valve output only from the ignition phase
until the end of the “regulation delay time”. This configuration is used
when the EXP-2 expansion card is present and via the negated blower
output (NC contact), to interrupt the air valve remote command allowing
minimum burner ignition.
Discontinue
delayed 3 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 3 seconds before moving onto burner igni-
tion, giving the valve time to close.
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