ESA ESTRO - E7014P rev. 02 - 03/05/17
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23
PARAMETER
VALUE DESCRIPTION
N° NAME
17
High
temperature
function
Inhibited
The instrument never activates the high temperature function even after
the specific command from the digital input.
Only flame
Bypass with ignition
The instrument activates the high temperature function with the sole
function of flame bypass for the time in which the specific digital input
command is present. With this high temperature function on, the instru-
ment carries out the ignition cycle normally, but at the end it keeps the
gas valves open, regardless of the flame presence signal. When this
function is enabled, the instrument conforms only to the EN746-2 Norm,
and the command to the digital input must come from the protection
system.
Only flame
Bypass without
ignition
The instrument activates operation at high temperature with the only
function of flame bypass like the previous selection with the difference
that during the burner ignition phase it does not activate the power out-
put of the ignition transformer.
Only prepurge
exclusion
The instrument activates the high temperature function with the sole
function of prepurge exclusion for the time in which the specific digital
input command is present. With this high temperature function on, the
instrument does not carry out the prepurge phase but skips directly to
burner ignition, monitoring the flame signal.When this function is ena-
bled, the instrument conforms only to the EN746-2 Norm, and the com-
mand to the digital input must come from the protection system.
Flame bypass with
ignition and
prepurge exclusion
The instrument activates the high temperature function with prepurge
exclusion and flame bypass function for the time in which the specific
digital command is present. With this high temperature function com-
mand on, the instrument does not carry out the prepurge phase but
skips directly to the ignition burner phase, keeping the gas valves open
regardless of the flame signal presence. When this function is enabled,
the instrument conforms only to the EN746-2 Norm, and the command
to the digital input must come from the protection system.
Flame bypass
without ignition
and prepurge
exclusion
The instrument activates the high temperature operation with prepurge
exclusion and flame bypass function like the previous selection but with
the difference that during the burner ignition phase it does not activate
the power output of the ignition transformer.
18
1°stage gas
ignition type
Fixed
The duration of the first gas safety time for 1st gas stage ignition is fixed.
The instrument checks the flame formation only at the end of the 1st
safety time after having deactivated the ignition transformer.This confi-
guration is compulsory with systems having unirod or UV2 probe type
detection.
Variable
The duration of the first safety time can be reduced automatically, to
immediately reach the regime phase (pulse firing). The instrument con-
tinuously checks the flame formation during the ignition phase and as
soon as it checks its presence, it deactivates the ignition transformer
and passes onto the next phase. This configuration is possible only with
systems having detection with a dedicated electrode.
19 Reaction time 1 ÷ 20 sec
Maximum safety time allowed between flame signal absence and gas
valve interception (see table of allowed times). If the flame signal returns
before the time expires, the instrument keeps the current phase, other-
wise it determines the behaviour configured in the “Behaviour at flame
loss” parameter.
For the ESA ESTRO-B version the “Regulation delay time – 2°safety time” parameter corresponds to the second
safety time, therefore the parameter is blocked and cannot be altered (see description of parameter 5).
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