Duomo gas proving systems
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Duomo gas detection
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Duomo carbon dioxide sensors
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Duomo ventilation interlocks
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Are available direct or from all major stockists
Troubleshooting
In case of alarm
Extinguish any naked flames.
Do not switch lights or electrical devices on or off.
Open all windows and doors to increase ventilation.
If the 'ALARM' L.E.D. is off the levels of gas have dropped. A responsible, qualified person is now safe to find the cause
of the alarm.
If the alarm sound remains constant, and the cause is not evident or possible to eliminate turn off the emergency
isolation valves to the area and contact your gas provider emergency line. They will advice accordingly.
If you are experiencing difficulties, having made the checks listed above call Duomo on 01905 797989 for
technical assistance.
The Problem
The Solution
No lights are illuminated on the fascia of the detector
Check that the electrical supply is reaching the
device and that the plug in terminal rail is pushed
into place.
One or all of the sensor fault lights are illuminated
Sensor fault continues to alarm
The detector is subject to repeated alarms
The detector is in a main alarm condition and the
main gas valve is not closing
There is no supply to the solenoid valve
Check that the plug is inserted correctlty.
Check that the sensor wiring is correctly terminated
at both the sensor and detector. Check that 12V DC
is present at the sensor. The green light on the sensor
should be illuminated. Pressing the TEST button it is
possible to check the efficiency of the device and if
the sensors have been connected correctly.
Check that the connections are correct and that
power is supplied to the valve i.e. the valve is not
stuck in the open position. The function of the alarm
relays both Pre-Alarm and Main Alarm can be
checked by pressing the TEST button on the detector
fascia. Check that the main alarm action is configured
for a latching alarm (Switch 2 on 4th DIP switch).
Check the sensor wiring. If the red Overload LED is lit
a short circuit or overload has occurred on the sensor
or the connecting cable.
Ensure that there is not an occassional gas leak. This
may be due to a valve or joint which leaks under
pressure.
The Main Alarm relay is a volt-free contact, therefore
you must connect the live supply to the common of
the main alarm relay contacts terminal 10. A supply
wil then come from terminal 12 to the solenoid valve.
Sensor is connected, but no L.E.D. is lit on the front
fascia
Check that the DIP switch is set to the ON position
