Navien NCB-180, Service Manual

Page: 12 / 149

DANGER
COMPROMISED VENTING SYSTEM

Failure to follow the Venting Section of the installation
manual may result in unsafe operation of this boiler. To
avoid the risk of fire, explosion or asphyxiation from
carbon monoxide, never operate the boiler unless it is
properly vented to the outside and has an adequate air
supply for proper operation.
 Be sure to inspect the vent termination and the air
intake pipe annually to ensure safe operation of the
boiler.

Immediately turn off and do not use the boiler if any of
the vent pipes, vent elbows and/or the boiler are:
- damaged in any way;
- separated at a joint,
- cracked or show evidence of corrosion, rusting or
melting.
DANGER
WHAT TO DO IF YOU SMELL GAS
If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury or loss of life.
DO NOT OPERATE THE BOILER.
DO NOT OPERATE ANY FAUCETS.
Smell all around the appliance area for gas. Be sure to
smell next to the floor because some gas is heavier than
air and will settle on the floor.

Do not smoke.
 Extinguish any open flames and sparks.

Do not operate light switches or electrical equipment
switches.

Do not use any phone in your building.

Open the windows and doors.
 Close the gas shutoff valve.

Keep people away from the danger zone.

Observe the safety regulations of your local gas
supplier, found on the gas meter.
 Immediately call your gas supplier from the outside of
the building. Follow the gas supplier’s instructions.

If you cannot reach your gas supplier, call the fire
department.

Notify your plumbing/heating contractor from the
outside of the building.
DANGER
HOT WATER TEMPERATURE SETTING

Water temperatures at or above 125°F (52°C) can cause
severe burns instantly or death from scalds.

Households with small children, disabled, or elderly
persons may require 120 °F (49°C) or lower
temperature setting to prevent contact with “HOT”
water.
TO PREVENT BURNS

Use the lowest operating temperature setting
necessary to provide comfortably-hot water.
 If your household has children or elderly or disabled
residents, consider using a lower temperature setting.

Read all the instructions in this manual carefully before
changing the temperature setting.

Feel the water before using it on children, the elderly,
or the disabled.

Contact a licensed plumber or your local plumbing
authority for more information.
 This boiler
’
s water temperature is set to 120
°
F (49
°
C)
at the factory for your safety and comfort. Increasing
the temperature increases the risk of accidental
scalding. Water temperatures at or above 125
°
F (52
°
C)
can cause instant scalding, severe burns or death.
Before you decide to change the temperature setting,
read the following charts carefully.
Water
Temperature
Time in which a young child can
suffer a full thickness (3rd
degree) burn
70 °C (160°F) Less than 1 second
60 °C (140°F) 1 second
55 °C (130°F) 10 second
49 °C (120°F) 10 minutes
37 °C (110°F) very low scald risk