Navien NR-180(A) Operation & Installation Manual page 6

Safety Instructions:
If the information in these instructions is not followed exactly, a fire or
explosion may result causing property damage, personal injury or death.
DO NOT OPERATE THE WATER HEATER. DO NOT OPERATE
ANY FAUCETS. Smell all around the water heater area for gas.
Be sure to smell near the floor because as some gas is heavier
than air and will settle near the floor.
Failure to follow the Venting Section of the Installation Manual may
result in the unsafe operation of this water heater. To avoid the risk of
fire, explosion or asphyxiation from carbon monoxide, never operate the
water heater unless it is properly vented to outside and has an
adequate air supply for proper operation.
Be sure to inspect the vent terminator and the air intake pipe annually to
ensure safe operation of the water heater.
Immediately turn off and do not use the water heater if any of the vent
pipes, vent elbows and/or the intake air pipe are :
Improper venting may cause a build-up of carbon monoxide (CO).
Breathing carbon monoxide can cause brain damage or death. Read and
follow the above instructions carefully.
6
DANGER
WHAT TO DO IF YOU SMELL GAS
DO NOT try to light any appliance.
DO NOT touch any electric switch.
DO NOT use any phone in your building.
Immediately call your Gas Supplier from a neighbor's phone. Follow the
Gas Supplier's instructions.
If you cannot reach your Gas Supplier, call 911 for police and/or the fire
department.
DO NOT return to your home until authorized by your gas supplier or the
fire department.
DANGER
COMPROMISED VENTING SYSTEM
i. damaged in any way;
ii. have separated at a joint;
iii. are cracked or show evidence of corrosion, rusting or melting;
WARNING