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Safety Precautions
WARNING
This device is equipped with functions that are extremely important for the safe operation of
combustion equipment. Be sure to follow the instructions stated in this user’s manual.
This device does not have a prepurge function. Use this device as part of a system whose
design gives careful consideration to the prepurge timer and ignition sequence timing,
following established safety guidelines.
Check the model number carefully and check that the sequence timing is as specified by the
combustion equipment manufacturer. Installing the wrong model can result in an explosion
hazard.
Make sure that the AUD flame sensor does not detect UV rays from a source other than the
burner.
Do not touch terminal 14 (F) after turning the power off. An electric charge may remain on
terminal 14 (F) and may cause an electric shock.
Carry out the pilot turndown test carefully.
Be sure to do a prepurge before restarting the system when lockout occurs. If the combustion
chamber and gas flue are not ventilated to remove any unburned gas, the ignition process
may cause an explosion.
Do not reset this device until the cause of the problem has been eliminated when lockedout
occurs.
Do not reset this device repeatedly when lockout occurs. If this device is misused, a serious
combustion equipment accident may occur.
Do not reset this device from a remote location. Because it is difficult to make a safety check
when far from the equipment, there is an increased risk of explosion.
Do not use the event output or alarm output as safety output.
This device has a limited product life. Beyond the product life, the risk of device failure
becomes higher. Replace this device within its product life.
Do not disassemble this device. Doing so may cause malfunction, device failure, or electric
shock.
Do not operate this device without first completing its adjustment and testing, and also the
testing specified by the combustion equipment manufacturer.
Do not extend the lead wires of the contact reset for more than the allowable length of
10 meters. If the device is reset from a location where it is difficult to check the safety of
combustion, there is a risk of explosion.
The ignition time for the pilot and main burners should not exceed the time defined by the
burner or device manufacturer. If it does, fuel will accumulate in the combustion chamber
and form an explosive mixture, resulting in a very dangerous situation in which an explosion
could occur.
Do not connect the solenoid valve to the high potential side (L1). If it is connected to L1 and a
ground fault occurs, current can leak to the solenoid valve and open it, allowing fuel to flow
out, regardless of the status of the burner controller.