Siemens LYC11 User manual

Siemens Building Technologies SpA CE1N7601e 05-04-2004

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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.

___________________________________________________________________________________________

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

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

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

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.

______________________________________________________________________________________________

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.

____________________________________________________________________________________________

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.

_____________________________________________________________________________________________

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

_____________________________________________________________________________________________

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

24V AC

G0 E V

C S A B1

L1M1V1

230V AC

BATT.

C S A

NO NC

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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

_________________________________________________________________________________________

Dimensions in mm

Dimensions

LYC11 Sensors QA..13/A

130

106

111

56.5

47.9

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

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

C S A B1

230V AC

BATT.

C S A C

E V

NO NC

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