Pag. 2/4
E191.604_En Rev. 4 dated 30/11/2018
EsiWelma
®
s.r.l.
Jumper Setup
Set jumper JP2
VALVE TYPE
to NC for normally closed valve type
(deliver condition) or to NO for normally open valve type.
Set jumper JP3
VALVE MODE
only if normally open valve is used.
C
ONT
position allows
to set EV output constantly powered in
case of gas alarm, while
PULSE
position
allows
to set it powered
by impulses at 10s intervals.
Jumper for valve
mode selection
Jumper for valve
type selection
VALVE / TYPE
NC
NO
VALVE / MODE
CONT.
PULSE
N
OTE: EACH CHANGE OF JUMPER SETUP MUST BE MADE UNDER POWER OFF.
Button functions
O
UTPUT
T
EST
button:
if pressed for at least 5s, starting from
normal operating condition, temporarily activates all outputs
(valve + relay + hooter) in order to check regular operation of
intervention and signal devices.
LED
TEST
RESET
OUTPUT
TEST
5s
E V
C NC NO
M
Relay outputs
de-energized
EV outputs
voltage absence (valve NC)
voltage presence (valve NO)
C NC NO
Alarm
Fail
E V
M
Note: relay operation in positive logic
Energized relay = alarm / fault absence
De- energized relay = alarm / fault presence
L
ED
T
EST
button: temporarily turns all LEDs ON in order to
check their integrity.
LED
TEST
RESET
OUTPUT
TEST
When button is
released the
LEDs go back to
their status
before the button
was pressed
Operation
When the UCE18 is powered at 24VAC
preheating phase
starts up
(about 1 min) while LEDs will indicate:
Green LED flashing (frequency 1Hz)
Control Unit Yellow LED steady on
Sensor Yellow LEDs steady on
Red LEDs steady on
During this phase there is no voltage at EV terminals, so it is not
possible to energize the solenoid valve(s) if NC type, while it is
possible to energize it/them if NO type. Further, the relays are not
energized.
After preheating phase, the
test phase
follows (3 min) while it is
possible to check sensors operation. To this purpose, all internal
timings for alarm management are zeroed.
In this phase LEDs will indicate:
Green LED flashing (frequency 2Hz)
Control Unit yellow LED steady on
Sensors Yellow LEDs steady on
Red LEDs steady on
During this phase there is voltage at NC solenoid valve(s), so it is
possible to open it/them using its manual actuator placed on the same
valve. The relays are energized.
Connect the battery to relevant terminals paying attention to polarity.
Operation test
During normal operation it is possible to simulate an alarm, in order to
check system functionality. Act as follows:
Activate test phase (if no more active after preheating) holding
down RESET button for at least 5s.
With cover fitted on approach a gas source to a sensor grid,
and let come out a small amount of gas.
CAUTION:
don’t spray the gas directly on the sensor,
otherwise it will be permanently damaged. Act to
increase gradually the gas concentration close to the
sensing element.
Sensors can be permanently damaged when exposed
to high or continuous concentrations of interfering
substances (like fresh paint, ammonia based cleaning
materials, alcoholic or silicone solvents etc).
To check carbon monoxide sensor a combustion smoke can be
used.
After these operation the control unit must indicate a gas alarm status
with these effects:
-
Sensor Red LED flashing
-
Solenoid valve(s) driven to
closed position
-
Changeover of alarm relay
contact (closed contact C -NC)
-
Piezoelectric hooter activated
(if present)
To restore normal operation, once alarm status is over, press RESET.
1
2
3
4
LED
TEST
RESET
OUTPUT
TEST
-
Sensor Red LED re-
verts to steady on
-
Alarm relay contact
reverts to initial position
(closed contact C - NO)
-
Piezoelectric hooter
deactivated (if present)
Note:
An alarm or fault condition during test phase (3 min) causes
flashing of the relevant red or yellow LEDs at 2Hz frequency
instead of 1Hz as indicated in functional table. This latter will be
valid for events starting from normal operating condition.
Return to normal operating condition by pressing RESET button
is possible only if there aren’t any active alarms.
Open the solenoid valve(s) manually.
The control unit continuously checks connections integrity both
for sensors and valves.
The sensor will perform best if used in an area where the
only gas or vapor present, besides fresh air, is the gas or
vapor that you wish to detect.
If used in an area contaminated with relative high concentration
of different interfering substances (like fresh paint, ammonia
based cleaning materials, alcoholic or silicone solvents etc.),
false alarms may occur.
IMPORTANT
We recommend to repeat operating test at least once a year or
after a long stop period and in any case every time that a sensor
is replaced.
