Safety Devices - Saunier Duval OPALIS 6 Manual

IMPORTANT : It is forbidden to bypass or tamper
with any of the safety devices. If, after attempting
to use the heater, a safety shut-down condition
occurs, this must be rectified immediately by a
qualified, competent person.
OPALIS 6 MODELS
The heater is fitted with a flue safety device. In the
event of total or partial obstruction of the flue
system or detrimental downdraught into the heater,
the safety device will shut off the heater requiring
a manual re-start. Restarting the heater must only
be carried out after waiting 15 minutes. Repeated
safety shutdown must be dealt with by a qualified,
competent person.
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SAFETY DEVICES

OPALIS 5 MODELS
Safety pilot atmospheric control
When the ambient atmosphere reaches a critical
vitiation threshold, the pilot is extinguished. The
thermocouple cools very rapidly thereby causing
the disconnection of the appliance, thereby auto-
matically cutting off the gas supply to the
appliance.
Heat exchanger - Blockage safety device
This device consists of a tube fixed onto the left side
of the combustion chamber. The other end rests
on a cradle integral with the stirrup fixed on the
burner bracket.
If the heat exchanger becomes blocked, the path
offered to the flue gases between the fins
decreases, and a stagnation of the combustion
products in the combustion chamber occurs, the
former tending to leak increasingly towards the
bottom of this chamber.
The tube permits recycling of the combustion prod-
ucts discharged at the level of the pilot. The
recycling flow rate of these products towards the
pilot increases as the heat exchanger becomes
more restrictive. When it reaches a critical threshold,
it extinguishes the pilot leading to an interruption of
the gas supply to the burner.
After a service call, the technician must check the
blockage safety device is in working order :
Dismantle the deflector and place the test-
mesh bottom plate at the top of the heat
exchanger
Ignite the pilot and leave the pilot to operate
for a minimum of 2 minutes
start the appliance and check that the com-
plete extinction of the appliance takes place in a
time less than or equal to 40 seconds
replace the test mesh bottom plate with the
deflector.