ESA ESTRO - E7014P rev. 02 - 03/05/17
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26
WARNINGS
For correct use of the flame control, respect the following
instructions.
¾
¾In the selection of configuration parameters analyze,
in addition to the specific rule, any risks associated with
certain modes of operation, choosing values which do
not jeopardize the safety of the application. Before
installing the unit, check that the configuration parame-
ters conform to what has been defined.
¾
¾ ESA
ESTRO is meant to be electrically connected in
a permanent and fixed manner. The reverse / neutral
connection may compromise the security of the system.
Do not use different phase between the various voltage
inputs and do not apply voltages on the output terminals
or serial communication.
¾
¾ The EMC emissions of the application must be chec-
ked following the incorporation of the final application of
the burner control device. The EMC application require-
ment shall be tested after the incorporation of the burner
control device into the final equipment.
¾
¾ Check the correct connection after installation. Before
powering the instrument make sure that the voltage and
frequency are correct; ensure that users do not have an
absorption greater than the maximum capacity of the
output contacts.
¾
¾ Burner safety shut down, for unsafe application con-
ditions (emergency, overheating, incorrect pressure
values etc), is guaranteed only by cutting off the power
to the device. The thermostat inputs (digital or expansion
inputs) are not safety inputs, but only for commanding
burner ignition and shut down for temperature regula-
tion. The same recommendation is valid for instruments
that are controlled by serial communication, where the
ignition and shut down commands cannot be considered
for safety but only for regulation control.
¾
¾ The
input digital signal must be pulse-type and must
not be present during the instrument’s auto diagnosis
when the input has the function for Reset/Stop,Only
Reset and Only stop; whilst it must be stable when the
input has other functions. The reset command is not
accepted if the pulse duration is less than or greater than
what has been specified.
¾
¾ The command that activates the high temperature
function, connected to the digital input with special con-
ductors, must derive directly from the safety temperatu-
re detector (a part of the protection system according to
the EN746-2). The temperature detector guarantees
indirect flame control, monitoring that the minimum
combustion chamber temperature is enough to guaran-
tee ignition of the fuel introduced. Refer to the specific
application norm for the choice of these devices.
¾
¾The
power supply for the solenoid fuel valves must be
derived only from the outputs on the ESA ESTRO.
Control of the fuel solenoid valves by other devices is
not allowed (relay, not safety PLC…) that receive the
command from the instrument.
¾
¾ If the digital input assumes the function of FSL for pur-
ging, or FSH for ignition or air pressure, the power sup-
ply phase of the sensor must come from the digital out-
put that will be configured for this function.
¾
¾ When replacing the output protection fuse, the fuse
must be fast acting and with a value that does not exce-
ed the maximum permissible current. Otherwise the not
replaceable fuse blows to protect internal relays, so that
the device does not work anymore.
¾
¾ Af
ter replacing the resettable fuse, before reconnec-
ting the instrument to the application it is imperative to
check the absence of internal damage. Check the insula-
tion between the power supply phase terminal and the
safety valve output phase terminals. Otherwise the
instrument must be sent to the manufacturer.
¾
¾ If there are disturbances with other equipment during
the burner ignition phase, use a connector with suppres-
sor filter for the connection of the HV cable to the ignition
electrode. Also check that the cable layout is correct (see
“Installation” chapter).
¾
¾ For unirod detection systems use only specific ignition
transformers, that allow operation for unirod ignition and
detection. Make sure that the device is connected correc-
tly to the earth protection before ignition to avoid irrepa-
rable damage.
¾
¾ In order not to overheat the ignition system control
devices (solenoid valves and transformers) keep a mini-
mum time lapse between the burner ignition attempts.
The minimum time should be calculated as follows: the
sum of the purging time plus first safety time plus 5 more
seconds.
¾
¾ In
case of lockout or failure refer to the “Visualization
and display” section to identify the failure according to
the code indicated by the instrument. Disconnect the
power supply before accomplishing any kind of operation
on the device.
¾
¾ In case of malfunctioning ESA ESTRO must be sent
back to the manufacturer for repair. Any type of repair or
alteration done by third parties causes the general gua-
rantee conditions to expire and compromises the device
safety.
¾
¾ If ESA ESTRO only checks the first FSL signal for pur-
ging or the FSH one for burner ignition, the operator must
occasionally check if the flow switch is working properly
(setting out of range etc), as the device checks the input
but cannot verify if the switch functions properly. The fre-
quency of these tests can be reduced in applications
where both flow switches are managed, as the flame
control verifies that the signals arrive only in the correct
phase, otherwise an alarm is indicated alarm.
¾
¾ ESA ESTRO is a device that controls burner safety
organs and checks its efficiency (a part of the protection
system according to the EN746-2). It is not intended for
burner regulation for which there are appropriate instru-
ments.
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