User Guide
Kitchen Fan Alarm Unit
with Gas Interlock
Installation and Operating Instructions
Tel: 01489 783783 Fax: 01489 788048 Email: info@ALS3.co.uk
1
www.ALS3.co.uk
Neatafan Ltd, Unit 12, Solent Industrial Estate, Shamblehurst Lane, Hedge End, Southampton, SO30 2FX
1 Quick install guide........ .................................................
Power supply:

The ALS1 requires a 230Vac power supply
fused at 5A either from an isolator, or local
spur.

Connect as detailed in wiring diagram (see
section 11)
Gas valve:

Connect 230Vac gas solenoid valve as
detailed in wiring diagram (section 11)

The gas valve is fused at 1A . The on-board
fuse can be increased to a maximum of 3A if
required.
Extract fan:

Remove wire airflow links.

Wire PS1 terminals to extract fan airflow switch
DO NOT APPLY ANY EXTERNAL VOLTAGE

Supply fan:

Remove wire airflow links.

Wire PS2 terminals to supply fan airflow switch
DO NOT APPLY ANY EXTERNAL VOLTAGE
2
Fire alarm:

Remove wire fire alarm link.

Wire FIRE terminals to external fire alarm volt
free contact
DO NOT APPLY ANY EXTERNAL VOLTAGE
External emergency stop:

Remove wire emergency stop link.

Wire FIRE terminals to external E-STOP
emergency stop contact
DO NOT APPLY ANY EXTERNAL VOLTAGE
CLOSE THE UNIT AND SCREW SHUT BEFORE
POWER SUPPLY IS ENERGISED
3
2 Contents..............................................................................................
1 Quick install guide......................................................... ................................................................. 2
2 Contents.............................................................................................. ....................................... 4
3 General description..................................................... ................................................................... 5
4 Safety........................................................................................................ ................................ 5
5 Unpacking................................... ......................................................................................................... 6
6 Controls and Indicators ................................. ................................................................................. 6
6.1 RESET pushbutton ......................................................................................................................... 7
6.2 MUTE pushbutton ......................................................................................................................... 7
6.3 LED indicators................................................................................................................................ 7
6.4 EMERGENCY STOP BUTTON .......................................................................................................... 9
6.5 SIREN ............................................................................................................................................. 9
7 Operating cycle................................................................... .......................................................... 9
7.1 Basic operating cycle (Start up): ................................................................................................... 9
7.2 Basic operating cycle (Shut down): ............................................................................................. 10
8 Alarms..................................................................................................... ................................ 11
8.1 Alarms ......................................................................................................................................... 11
8.2 Muting Alarms............................................................................................................................. 11
8.3 Alarm reset.................................................................................................................................. 11
9 Wiring diagrams............................................................. ............................................................. 12
10 Contact Details................................................................. ......................................................... 13
4
3 General description.....................................................
BS 6173:2009 calls for commercial kitchen supply and extract fans to be interlocked
with the gas supply in order to prevent gas cooking equipment being used without
suitable ventilation. The ALS1 monitors the supply and extract airflow, shutting off
the kitchen supply gas solenoid in the event of an airflow fault. This unique hardwired
solution achieves compliance with BS 1673 and other relevant standards.
The ALS1 is a low-cost, reliable and attractive unit. Designed with the installer in
mind, features such as diagnostic indicators on the front of the panel ensure that the
unit can be fitted quickly and with ease.
The ALS1 is manufactured in the UK by Neatafan and is provided with a
comprehensive one year warranty. For more information contact Neatafan. Contact
details are at the end of the manual.
4 Safety........................................................................................................
To reduce the risk of electrical shock, isolate the control panel before opening the
cover. All wiring should be carried out be a qualified Electrician in accordance with
the latest IEE Regulations.
The ALS1 gas interlock is designed for indoor use as described in this manual. Using
this product for any other purpose other than that for which it was designed may
cause harm and will invalidate the warranty.
The ALS1 must be installed by a suitably qualified engineer. If you are unsure about
the safe operation of this product, contact Neatafan for advice. Contact details are at
the end of this manual.
5
5 Unpacking...................................
Neatafan takes great care to ensure your ALS1 gas interlock system reaches you in
perfect condition. After unpacking, please check for any damage to the unit, retaining
any packing materials should the unit need to be returned.
6 Controls and Indicators
.................................
1. RESET pushbutton
5. Siren
3. MUTE pushbutton
2. LED indicators
4. EMERGENCY STOP button
6
6.1 RESET pushbutton
Pressing the RESET button when there are no alarms and the airflow is established
will open the gas valve.
The RESET button will also clear active alarms such as an emergency stop.
6.2 MUTE pushbutton
When an alarm is present, an audible alarm will sound. The siren can be silenced by
pressing the MUTE push button.
6.3 LED indicators
6.3.1 POWER indicator
Behaviour:
Details:

 GREEN
The system is healthy.

 FLASH GREEN

 RED

 FLASH RED
The system is healthy and there is sufficient airflow to
permit the gas valve to be opened –press the RESET
button.
There is an active alarm.
The ALS1 unit runs a self-diagnostic test during
initialisation and has detected a fault. Contact supplier.
7
6.3.2 FANS indicator
Behaviour:

 GREEN

 FLASH GREEN
Details:
The airflow switches have detected sufficient airflow to
permit the gas valve to be open.
The ALS1 is waiting for the airflow to establish. 20 seconds
are allowed for this to happen.
During normal operation, the FANS indicator may flash
occasionally if there has been a minor interruption to the
airflow.
 RED
The airflow was not established within 20seconds so the
ALS1 is reporting an airflow fault.
6.3.3 GAS VALVE indicator
Behaviour:
Details:

 GREEN
The gas valve is open.(gas on).

 RED
The gas valve is closed (gas off).
6.3.4 E-STOP indicator
Behaviour:

 RED
Details:
An emergency stop alarm is present. Either the emergency
stop button on the front of the ALS1 unit or a remote
emergency stop button has been pressed.
6.3.5 FIRE ALARM indicator
Behaviour:

 AMBER
Details:
A fire alarm is present. The ALS1 will report a fire alarm if
the FIRE terminals are open circuit.
8
6.4 EMERGENCY STOP BUTTON
Pressing the emergency stop button will shut off the gas. If the e-stop button has
been pressed, twist it anti-clockwise to release it.
6.5 SIREN
The siren will sound in the event of an alarm. Pressing the MUTE button will silence
the alarm, but not clear the alarm event.
7 Operating cycle...................................................................
7.1 Basic operating cycle (Start up):
When the unit is powered up, the GAS VALVE indicator will be illuminated RED
indicating that the main gas valve is off.
When the ventilation is started, the FANS indicator will FLASH GREEN until the
airflow is established.
When the airflow has stabilised, the FANS indicator will illuminate GREEN. After a
few seconds, the POWER lamp will flash GREEN indicating the system is safe.
Press RESET to activate the gas valve.
9
Power up ALS1
GAS VALVE indicator  RED
The kitchen main gas valve is off.
Start VENTILATION
20seconds
FANS indicator  FLASH GREEN
while the airflow is established
Airflow stabilises
AIRFLOW indicator  RED
There is an airflow fault
POWER indicator  FLASH GREEN
...to show the system is safe
Press RESET
GAS VALVE indicator  GREEN
and the kitchen gas valve is on.
7.2 Basic operating cycle (Shut down):
Press the E-STOP and then MUTE button to turn off the gas valve.
Press the E-STOP button
E-STOP indicator  RED
The siren sounds .The kitchen main gas valve is off.
Press MUTE
The alarm is silenced
Turn the power OFF
10
8 Alarms.....................................................................................................
8.1 Alarms
In the event of an alarm, the POWER indicator will be illuminated red, the GAS
VALVE indicator will be illuminated red and the gas valve will be de-energised.
Alarm:
Details:
Indication:
Fire Alarm
The external fire alarm contact is open.
(Please note the emergency stop will
not be indicated in this condition).
FIRE ALARM
 AMBER
Emergency stop
The emergency stop button on the
ALS1 has been pressed or the external
emergency stop contact is open.
E-STOP
 RED
Fans airflow fault
The airflow switches have detected that
the correct airflow has not been
established within 20 seconds.
FANS
 RED
During this time, the FANS indicator
would have flashed green
ALS1 internal alarm
The ALS1 has detected an internal fault
during the initialisation sequence.
Contact the supplier for advice.
POWER
 FLASH RED
8.2 Muting alarm
When an alarm is activated, the corresponding LED will illuminate on the front of the
ALS1 and a siren will sound.

Press the MUTE button to silence the alarm.
8.3 Alarm reset
If an alarm has been cleared (for example the emergency stop button has been
released, press the RESET button to clear the fault on the ALS1.
11
9 Wiring diagrams.............................................................
12
10 Contact Details.................................................................
Neatafan Ltd
Unit 12, Solent Industrial Estate
Shamblehurst Lane
Hedge End
Southampton
SO30 2FX
Tel: 01489 783783
Fax: 01489 788048
Email: info@ALS3.co.uk
www.ALS3.co.uk
Manual issued: 05/10/2015
13