- 31
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ENGLISH
OPERATING CYCLE
ARIA
TW
Begins with the closure of the thermostatic
line or the PG. The PA must be in the rest
position. This is the waiting and self-test
time lasting for 2,5 seconds.
T10
Begins when the motor starts up and with
the pre-purge phase; it lasts for 5 seconds,
within which the PA air pressure switch
must give the go-ahead.
T1
Pre-purge time, which lasts for at least 30
seconds, ending when the transformer star-
ts up.
T3
Pre-ignition phase, it ends when the gas
valve opens, and it lasts for 2 seconds.
T2
Safety time, within which the flame signal
must reach the EC electrode; it lasts for 3
seconds.
Necessary input signals
Output
signals
A
Begin start up
B Flame
present
B-C Operation
C Control
stop
C-D
Air gate c post-purge
TC-PG
Thermostats/Gas pressure switch line
MB Burner
motor
PA
Air pressure switch
TR Ignition
transformer
V Gas
valve
EC Control
electrode
LME EQUIPMENT
The release pushbutton on the equipment is the main component for accessing all the diagnostic functions (activation and
deactivation) as well as for releasing the control and checking device. The release pushbutton has a multicoloured led
which indicates the state of the control and checking device during operation and when the diagnostic function is in use.
EQUIPMENT STATE INDICATORS
Description
Condition Colour
sequence
Standby, other intermediate states
No light
Ignition stage
Yellow, flashing
Correct operation
Green
Incorrect operation, current level of
flame detector below permitted minimum
Green, flashing
Drop in voltage
Alternating yellow red
Burner lock out
Red
Fault (see table)
Red, flashing
Stray light before burner ignition
Alternating green red
Rapid flashing for diagnostics
Red, rapid flashing
Summary of Contents for EM 3 ST-E
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Page 21: ...21 ITALIANO...
Page 39: ...39 ENGLISH...
Page 57: ...57 FRAN AIS...
Page 75: ...75 DEUTSCH...
Page 93: ...93 ESPA OL...
Page 100: ...100 EM 6 ST E GB E 055 1 2 Pi mbar fi Pi fi Pt 2 4 3 4 fi 1...
Page 101: ...101 fi A fi B fi C D EM 6N ST E EM 3 ST E fi fi fi fi fi fi fi fi fi fi fi fi...
Page 104: ...104 3 sec 3 sec LME fi fi fi fi fi fi fi fi fi fi fi fi fi 10...
Page 110: ...110 1 A B A B 2 fi A B C A B C fi 3 fi A fi fi A...
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