Pag. 4/4
E191.604_En Rev. 4 dated 30/11/2018
EsiWelma
®
s.r.l.
Throubleshooting
Effect
Possible cause
NC valves type do not open
Valve not connected
No power
NO valve type instead of NC type
Incompatible valve type
(power absorption > 26W total)
Alarm not reset or current
Current sensor preheating phase
All sensors defective
General Fault presence
(NO) valve type
does not close
Valve not connected
Sensor not in alarm condition
Cable interrupted
RESET button does not
restore default conditions
A sensor still in alarm condition
Control unit fault
(Control unit Yellow LED OFF)
OUTPUT Test button does
not work
Current fault / alarm
Connections
E
V
G
G0
C1 S1 A1
+
-
C
NC
NO
C
NC
NO
+
-
Batt
C2 S2 A2
C3 S3 A3
C4 S4 A4
E
V
ALARM
FAIL
G
24 V AC power supply, voltage
G0
24 V AC power supply, system neutral
C1
Sensor input 1 (common)
S1
Sensor input 1 (signal)
A1
Sensor input 1 (power)
C2
Sensor input 2 (common)
S2
Sensor input 2 (signal)
A2
Sensor input 2 (power)
C3
Sensor input 3 (common)
S3
Sensor input 3 (signal)
A3
Sensor input 3 (power)
C4
Sensor input 4 (common)
S4
Sensor input 4 (signal)
A4
Sensor input 4 (power)
E
Valve output 12VDC
V
Valve output 12VDC
C
alarm
Alarm relay output (common)
NC
alarm
Alarm relay output (normally closed contact)
NO
alarm
Alarm relay output (normally open contact)
C
fail
Fault relay output (common)
NC
fail
Fault relay output (normally closed contact)
NO
fail
Fault relay output (normally open contact)
+
Batt
Battery output +
-
Batt
Battery output -
+
Hooter output +
-
Hooter output -
Layout
s
LYC18
LED
TEST
RESET
OUTPUT
TEST
1
2
3
4
G G0
24V
C1
S1
A1
E V
C NC NO
C2
S2
A2
C3
S3
A3
C4
S4
A4
VALVE / TYPE
VALVE / MODE
NC
NO
CONT.
PULSE
+ -
Batt.
F1
3A
FAIL
C NC NO
ALARM
E V
+ -
1
2
7
8
9
10
14
15
11
12
13
3
4
5
6
1 Battery connection terminal
9 Alarm and Fail relay outputs
2 Battery protection fuse T3.15A
10 12VDC 300mA max hooter output
3 12V valve terminals
11 LED Test button
4 Control Unit status LEDs
12 OUTPUT Test button
5 Sensors status LEDs
13 RESET button
6 Valve Mode Jumper
14 Remote sensors terminals
7 Valve Type Jumper
15 Not used
8 24VAC power supply terminal
Due to our policy of continuous product improvement,
specifications are subject to change without notice.
Wiring diagrams
Control unit UCE18 with 4 sensors and n.2 12VDC solenoid valves. 12V buffer
battery and external hooter. Optional devices (lamps, extractors).
Y1
24V AC
G
G0
G
G0
E
V
B1
C S A
C
1
S
1
A
1
+
-
N O N C
C
M1
V1
230V AC
L
N
BATT.
N1
C S A
C S A
C S A
B2
B3
B4
Y2
L1
N O N C
C
alarm
fail
C
2
S
2
A
2
C
3
S
3
A
3
C
4
S
4
A
4
+
-
H1
M
E
V
M
R
18Kohm 1/4W termination resistor
to be used in place of sensor
N1
Control unit UCE18
B1 ÷ B4
Sensors UR.13/A
Y1 ÷ Y2
Solenoid valves 12VDC
H1
External hooter 12VDC 300mA max
V1
Battery 12V 6÷10Ah (not supplied)
M1 - L1
Auxiliary devices (lamps, extractors, etc.).
Control unit UCE18 with con 4 sensors and
230VAC solenoid valve. External
hooter 12V. Control of optional auxiliary devices (signal lamps etc).
Y1
24V AC
G
G0
G
G0
E
V
B1
C S A
C
1
S
1
A
1
+
-
N O N C
C
230V AC
L
N
BATT.
N1
C S A
C S A
C S A
B2
B3
B4
L1
N O N C
C
alarm
fail
C
2
S
2
A
2
C
3
S
3
A
3
C
4
S
4
A
4
+
-
H1
M
E
V
Rv
R
18Kohm 1/4W termination resistor
to be used in place of sensor
1.8Kohm 1/2W termination
resistor to be used in place
of solenoid valve
N1
Control unit UCE18
Rv
Factory supplied
B1 ÷ B4
Sensors UR.13/A
Y1
Solenoid valve 230VAC
H1
External hooter 12VDC 300mA max
L1
Auxiliary devices (signal lamps, etc.).
Dimensions
UCE18
155
10
6
8
9
174
56.5
47.9
31
s
LYC18
LED
TEST
RESET
OUTPUT
TEST
1
2
3
4
G G0
24V
C1
S1
A1
E V
C NC NO
C2
S2
A2
C3
S3
A3
C4
S4
A4
VALVE / TYPE
VALVE / MODE
NC
NO
CONT.
PULSE
+ -
Batt.
F1
3A
FAIL
C NC NO
ALARM
E V
+ -
UR.13/A
Dimensions in mm
UCE18
UCE18
