Siemens LYC11 User manual

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s7601
INTELLIGAS®
Gas leak detection system
for heating rooms and similar environments LYC11
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Electronic control unit for gas leak detection with single sensor aimed to drive a
gas flow cut-off 12VDC normally closed (NC) or normally open (NO) solenoid
valve. Single threshold sensor with tin dioxide sensing element. Possible control
of auxiliary devices (hooters, flashing lights, fans…) or 230VAC solenoid valves
through built-in relay. 24VAC power supply. Built-in battery charger for optional
external 12V buffer battery charge with automatic intervention in case of power
failure.
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LYC11 control unit is used, connected to a QA..13/A sensor, for optical/acoustic signaling
or to drive a gas flow cut-off valve in presence of dangerous concentrations of:
•methane (CH4)
•LPG
•carbon monoxide (CO)
note: Only one sensor QA..13/A can be connected to the control unit
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Description Type
Control unit LYC11
Sensor for methane gas IP44 QAG13/A
Sensor for LPG gas IP44 QAG13.P/A
Sensor for carbon monoxide (CO) IP44 QAO13/A
Gas solenoid valves 12V DC E..D (NC) or E..E (NO)
Gas solenoid valves 230V AC E..D-AC (NC) or E..E-AC (NO)
Use
Available models

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The LYC11 can be installed as follows:
AOnto a DIN bar minimum length 120 mm
BOnto a wall using 2 screws
COn panel front end using a DIN bar minimum length 150mm
and 2 hex spacers 50 mm,screws and washers.
A B C
In a position exposed to natural air circulation. Never close to suction grids, openings
towards building outside or in place subject to water jets and anyhow near possible gas
leak places. Besides:
QAG13/A: High, at about 30cm (1 ft) from the ceiling, for light gas detection like
methane (CH4) or town gas.
QAG13.P/A: Low, at about 30cm (1 ft) from the floor, for heavy gas detection like LPG
(Propane, Butane, etc.).
QAO13/A:At about 1.5m (5 ft) from the floor, for detection of carbon monoxide (CO)
with density similar to air.
Check that environmental specifications of the installation place are compatible with the
values listed on technical data.
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It is possible to use common electric cables. However, when installing in places exposed
to high electromagnetic fields, use of shielded cables is recommended.
The LYC11 must be powered at 24VAC.
There is no protection against accidental connection with 230V on the 24V side.
Use double-insulation safety transformers; they should be sized for continuous operation
at rated power (please refer to technical data).
As a general rule:
Comply with local regulation about wiring. The device should be directly connected to
mains and be permanently powered up.Check that sensor QA..13/A is compatible with
the gas type to be detected and make certain that connected solenoid valve is compatible
with the control unit.
Mounting
LYC11
Sensor QA..13
Wiring
s
QAG13/A
METHANE GAS METANO
Respect the correct mount orientation in order to
ensure the normal convection air flow inside the
sensor.

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The control unit is included in a case suitable for mounting on a DIN bar and a processing
and control PCB.
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Please carefully read and follow enclosed instructions and retain them with the equipment
for any future need.
The control unit and sensor are monitoring equipment, so they must not be tempered:
never touch the sensor or electronics.
LED TEST button = temporarily turns all LEDs ON in order to check their integrity.
OUTPUT TEST button = if pressed for at least 5s, starting from normal operating
condition, temporarily activates all outputs (valve + relay) in order to check regular
operation of intervention and signal devices.
Set JP2 jumper VALVE TYPE to NC for normally closed valve type E..D
(delivery condition) or to NO for normally open valve type E..E.
Set JP3 jumper VALVE MODE only in case ofnormally open valve use.
CONT 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.
Case
Commissioning
Jumper Setup
s
LYC11
LED
TEST
RESET
OUTPUT
TEST
G G0
24V C S A E V C NC NO
+ -
Batt. VALVE / TYPE
JP2
VALVE / MODE
NC NO CONT. PULSE
JP3
F1
3A
1
2
3
4
5
6
7
11
12
8
9
10
1. Terminal for 12V battery
2. Battery protection fuse T3.15A
3. LEDs for control unit, valve and sensor status
For complete functionality please refer to functional table
4. Terminal for sensor QA..13/A
5. Terminal for 24VAC power supply
6. VALVE MODE Jumper for operating mode selection of EV output
(active only with VALVE TYPE jumper = NO)
-CONT = continuous
-PULSE = impulse (1 impulse every 10s)
7. VALVE TYPE Jumper for solenoid valve type selection
-NC = Normally Closed
-NO = Normally Open
8. LED test button
9. OUTPUT test button
10. RESET button
11. Terminal for 12VDC 13W max solenoid valve
12. Terminal for SPDT relay output
Jumper for valve
mode selection
Jumper for valve
type selection
VALVE / TYPE
NC NO
VALVE / MODE
CONT. PULSE

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Every change of jumper setup should be made under power off. Alternatively, if change is
made under power on conditions, the control unit must be powered off for at least 5s.
If no Intelligas valve should be connected to EV output, insert a valve termination Rv
1.8Kohm 1/2W (supplied with the equipment) in the EV terminal. This will avoid any wrong
valve fault signal.
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After powering up (24V AC) the control unit LYC11 carries out these phases in sequence:
1. Sensor preheating phase. During this phase, about 1min, the detection system is not
operational. Moreover, it is not possible to open the solenoid valve if normally closed,
while it is possible to if normally open.
2. TEST phase. During this phase, about 3min, all internal timers are zeroed in order to
facilitate sensor test (alarm simulation).
3. Normal operation phase. This is the normal operating phase of the control unit while
both gas alarm monitoring and self test for plant faults (sensor and valve) and system
faults (control unit) are active.
In presence of dangerous gas or carbon monoxide concentrations control unit LYC11
enters gas alarm phase and carries out these operations:
§Closes the gas cut-off solenoid valve and avoids it can be open again until alarm
condition is true. Closing is made as follows:
-NC Valve type = voltage cut-off from EV terminals
-NO Valve type = voltage feed to EV terminals, by impulses or continuously
(please refer to VALVE MODE jumper),
§Activates flashing of red alarm LED
§Activates auxiliary devices (if connected to the relay)
Once gas alarm condition is passed the control unit must be reset to normal operation.
Press RESET button on front side: the control unit carries out the following operations:
§makes possible manual opening of cut-off valve
§deactivates flashing of red alarm LED that turns steady on
§deactivates auxiliary devices (if connected to the relay)
At any moment, starting from normal operating condition, it is possible to activate again
TEST phase by pressing RESET button for at least 5s.
Note:
Return to normal operating condition by pressing RESET button is possible only if there
are no active alarms.
WARNING:
The sensor must be replaced within the 5th year from installation date
Operation

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LYC11 Functional table
FUNCTIONS GREEN LED YELLOW LED RED LED EV output (NC valve) RELAY output
Sensor preheat phase Flash (1Hz)ON ON Voltage absence De-energized
TEST phase Flash (2Hz) ON ON Voltage presence Energized
Normal operation ON ON ON Voltage presence Energized
Gas alarm ON ON Flash (1Hz) Voltage absence De-energized
Valve fault (*) ON Flash (1Hz) ON Voltage absenceDe-energized
Sensor fault ON Flash (1Hz)
OFF
Voltage absence De-energized
General fault ON OFF OFF Voltage absence De-energized
(*) Valve fault is detected by short circuit (normally closed valve), and by open circuit (normally open valve).
The simultaneousness of two or more events causes a combined management of LEDs
and outputs according to a given priority.
An alarm or fault condition during test phase (3 min) causes flashing of the relevant red or
yellow LED at 2Hz frequency instead of 1 Hz as indicated in function table. This latter will
be valid for events starting from normal operating condition.
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This product was developed and manufactured using materials and processes which take
full account of environmental issues and which comply with our environmental standards.
Please note the following for disposal at the end of the product life, or in the event of its
replacement:
•For disposal, this product is defined as waste from electrical and electronic
equipment (“electronic waste”); do not dispose of it as household waste. This applies
particularly to the PCB assembly.
•Always use the most environmentally compatible method of disposal, in line with the
state-of-the-art technology in environmental protection, recycling, and waste
management.
Observe all current local laws and regulations.
•Always aim for maximum re-use of the basic materials at minimum environmental
stress. Observe any notes on materials and disposal that may be attached to
individual components.
•Use local depots and waste management companies, or refer to your supplier or
manufacturer to return used products or to obtain further information on environmental
compatibility and waste disposal.
The LYC11 shipping case can be recycled. Retain it for future use or in case of product
return to the manufacturer.
Environmental
compatibility
and disposal
Shipping case

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Respect current regulations for wiring. The devices should be directly connected to mains
(that is with no switches, etc.) and be permanently powered up.
The positive logic operation of internal relay means an always energized contact (C-NC
open) in no alarm and/or fault condition.
EV control output is solid state type and is sized for an INTELLIGAS® solenoid
valve with 13W maximum absorbed power. It is not to be used to drive solenoid
valves with higher power consumption.
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Indicate control unit number and sensor corresponding to the gas type to be detected
LYC11 Gas detection control unit for 1 sensor
QAG13/A Sensor IP44 for Methane detection (CH4)
QAG13.P/A Sensor IP44 LPG detection
QAO13/A Sensor IP44 for carbon monoxide (CO) detection
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Control unit LYC11
Power supply voltage 24VAC +/-10%
Frequency 50 Hz
Power consumption 21VA max (with battery under charge)
Control Outputs -electronic 12V DC (13W max)
-SPDT Relay 250V 5(3)A
Operation Logic Positive (normally energized relay, de-energizes in case of alarm
and/or fault)
type of controlled solenoid valve
(see data sheet n° 7684). normally closed type E..D / E…DFL or
normally open type E...E
Connections length 80m max (sensor and NO solenoid valve)
40m max (NC solenoid valve)
Cable cross section 1.5mm2 min (sensor and solenoid valve)
Connectable sensor 1 (type QA..13/A)
Optical indications Green LED (power presence / TEST)
Yellow LED (control unit / solenoid valve / sensor fault)
Red LED (gas alarm)
Timers 3s between alarm acknowledgement from sensor and solenoid valve,
relay output and relevant LED activation.
Allowed room temperature 0…+50°C (operation)
-20…+70°C (transport and storage)
Allowed room humidity 20…90% R.H. non condensing
Case PC polycarbonate
Protection IP20 –EN60529
Dimensions 130 x 106 x 56.5 mm
compliance
Regulations Low voltage 73/23 CEE
Electromagnetic Compatibility 89/336 CEE
Standards EN60335-1
EN50270
Hints for design
Ordering
Technical data

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Sensor QA..13/A
Sensing element Tin dioxide semiconductor
Case Self-extinguishing ABS
Protection degree IP44 if correctly installed
Allowed room temperature 0…50°C (operation)
-20…+70°C (transport and storage)
Allowed room humidity 30…90% R.H. non condensing
Alarm threshold QAG13/A= 10000ppm methane (20% LEL)
QAG13.P/A= 3700ppm LPG (20% LEL)
QAO13/A= 200ppm CO
LEL = Lower Explosivity Limit ppm = part per million
Sensors Average Lifetime 5 years from installation date
Sensor covered surface About 40m2 (indicative)
Built-in relay
Operation
Positive Logic (normally energized).
De-energizes in case of alarm / fault
Contact Changeover, voltage free 250VAC 5(3)A
Built-in battery charger
Charge voltage 13.8VDC
Charge current 0.5A max
Battery protection fuse T3.15A 250V 5x20
Connectable Battery 12V 4÷6 Ah (not supplied by Siemens)
Buffer charge with automatic intervention current limit
Diagram 1: Control unit LYC11 with sensor QA..13/A and 12V DC solenoid valve type
E..D. 12V buffer battery. Optional control of signal lamps and air extractors.
Wiring diagrams
Symbols:Options
N1 = Control unit LYC11 M1 = air extractor
B1 = Sensor QA..13/A L1 = signal lamp
Y1 = Intelligas solenoid valve NC 12VDC
type E..D / E…DFL
V1 =12V 4÷6Ah Battery
Y1
24V AC
N1
G
G0
G
G0 E V
C S A B1
+-
L1M1V1
230V AC
N
BATT.
M
L
C S A
NO NC
C

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Diagram 2: Control unit LYC11 with sensor QA..13/A and 230V AC solenoid valve type
E..D-AC. Optional control for signal lamp
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Dimensions in mm
© SBT SpA Subject to modifications
Dimensions
LYC11 Sensors QA..13/A
130
106
89
111
56.5
47.9
31
s
LYC11
LED
TEST
RESET
OUTPUT
TEST
G G0
24V C S A E V C NC NO
+ -
Batt. VALVE / TYPE
JP2
VALVE / MODE
NC NO CONT. PULSE
JP3
F1
3A
Symbols: Options
N1 = Control unit LYC11 L1 = 230VAC signal lamp
B1 = Sensor QA..13/A
Y1 = Intelligas solenoid valve NC 230VAC
type E..D-AC / E..DFL-AC
Rv = EV termination resistor
Note:
The termination resistor (Rv = 1.8Kohm 1/2W) is to be inserted between EV ter-
minals only if that output is not used
24V AC
N1
G
G0
G
G0
C S A B1
+-
230V AC
N
BATT.
L
C S A C
Y1
E V
L1
M
NO NC
Rv