Navien CH-180, Operation Manual

Page: 39 / 46

Combination water heater operation
39
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Freeze Protection

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 Water H
eater 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.

This combination water heater is designed for indoor installation. Do NOT
install this unit outdoors.

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 water heater 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.

The freeze protection function requires
electricity. If the combination water heater 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.
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.
Damage caused by freezing is NOT covered under Warranty
CAUTION
MAINTENA
NCE