ewoo EW-403, Reference Manual

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4. OPERATIONAL SYSTEM
5. INSTALLATION
5-1. Where to install
① The detector is designed to be installed in the area that is subject to
expose to gas or the area where the leaked gas tend to stay.
② Please determine the location of the sensor considering the kind of the
Gas, cautions and condition.
③ If you are to detect the gas that is heavier than air, sensor be mounted at
Floor or the wall within 30cm from floor, and if you are to detect the
Gas that is lighter than air, sensor should be mounted at the ceiling or
The wall within 30cm from ceiling
(Plus: sensor should be farther than 1m and within 4m from the gas appliance)
④ Please install the detector at the place that the audible alarm is able to be
Heard so that manager can take follow-up measures.