Navien CH-180, User'S Operation Manual

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Freezing damage will only occur if backdrafting is present caused by negative
pressure within the building. This situation is not caused by the Navien Combination
boiler and as such is not Navien’s responsibility. Navien will not warrant any
damage due to freezing. The installing contractor must be aware of this situation
and ensure that there is sufficient make-up air to avoid such a situation.
To avoid any freezing issues, Navien strongly recommends the use of Direct
Vent. Ensure the exhaust vent pipe AND the air intake pipe are both connected
directly from the combination boiler collars (top of unit) to the outdoors. This
Direct Vent type installation will minimize any air movement within the unit.
1. Do not unplug the electric power supply cord.
2. Insulate incoming and outgoing pipes to prevent freezing during cold
seasons.
3. Don’t shut off the gas valve.
4. Emergency methods for when inlet pipe is frozen:
During extreme cold seasons, when hot water is not able to flow, the inlet
pipe may be frozen.
Using a hair dryer or heat gun, thaw the pipe to allow flow.
The freeze protection function requires electricity.
If the combination boiler is installed in a cold
area that experiences freezing temperatures
and/or frequent power outages, drain the unit to
avoid damage.
The freeze protection will operate regardless of
whether the remote controller is ON or OFF.
Freeze Protection
CAUTION
Damage caused by freezing is NOT covered under Warranty