Navien NR-20DU, User Manual, Page: 4 / 32

3
Safety Instructions
The following safety symbols are used in this manual. Read and follow all safety
instructions in this manual precisely to avoid unsafe operating conditions, fire,
explosion, property damage, personal injury, or death. Keep this manual for future
reference.
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or loss of life.
Indicates an imminently
hazardous situation which, if not
avoided, could result in severe
injury or death.
Indicates a potential hazardous
situation which, if not avoided,
may result in injury or death.
Indicates a potentially
hazardous situation that, if not
avoided, could result in property
damage.
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