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UK Sales Tel: 0845 345 7253
International Tel: +44 1732 861225
GL-CO-RFG361
Issue: 5.5
Date Of Issue: 28/10/2008
© 2008 Sontay Limited. All rights reserved.
Alarm Levels (continued)
Self Diagnostics
The alarm threshold for Natural Gas is about 16% of the
LEL. This is below the limit set by the manufacturing stan-
dards (20% LEL). The pre-alarm threshold is about 66.6%
of the alarm threshold. Using the SENSITIVITY pot the
thresholds can be adjusted within the limits established the
manufacturing standards. Turning the pot t in-
creases the sensitivity and turning towards - decreases the
sensitivity.
Sensor location
Natural gas
100 to 500mm from the ceiling
LPG
100 to 500mm from the floor
CO
1.5 to 2m from the floor
It is advisable to position sensors at a certain distance from
gas appliances, so as to avoid nuisance triggering.
Boilers & DHW
1 to 2 meters
Gas cookers
2 to 3 meters
Cable Types
Power & relay
1.5mm²
Sensor up to 40m
1.5mm²
Sensor up to 60m
2.5mm²
Operation
When the controller is switched on it remains inactive for 1.5
to 2 minutes with the FAULT and ALARM LEDs flashing, to
allow the sensor to stabilise.
When the gas concentration exceeds the pre-alarm thresh-
old the ALARM LED blinks.
When the gas concentration exceeds the alarm threshold,
after a delay of about 20 seconds:
•
The internal buzzer will sound (if enabled)
•
The ALARM LED switches ON
•
Activates the operational control
In the event of a fault or incorrect connection of the sensor
the following LED states will occur:
Commissioning
1. Apply power to controller - POWER LED lights.
2. Wait 2 minutes for sensor to stabilise.
3. Set SENSITIVITY pot to ‘0’
4. Simulate presence of gas (gas from a lighter should
work).
5. When the alarm threshold is reached, after a 20 second
delay the ALARM LED will light, the buzzer will sound (if
enabled) and the relay operate.
6. Stop gas simulation. When the concentration falls below
the alarm threshold:
Without latching alarm - buzzer ceases, ALARM LED
blinks slowly
With latching alarm - buzzer continues until RESET button
is pressed for at least 5 seconds.
Gas Shut Off Valve
This must be installed on the gas feed pipe, possibly outside
the space controlled, in a place which is easily accessible
and is protected from bad weather.
NB In LPG installations the valve must be installed down-
stream of the pressure reducing valve.
Type of Fault
Fault LED Alarm LED
Sensor self-heating element broken ON
OFF
No connection to terminal G
ON
OFF
No connection to terminal B
ON
OFF
No connection to terminal M
OFF
ON
Connections G & B reversed
ON
OFF
Connections G & M reversed
OFF
ON
Connections B & M reversed
OFF
ON