Navien NPE-32AWE, Installation Manual

Page: 46 / 68

46 Maintaining the Water Heater
6.5 P rotecting the W ater H eater from
F ree z ing
CAUTION
Damage due to free z ing is not covered by the Navien
limited warranty.
If the water heater is connected to a circuit that could free z e, the
circuit pipes must be suitably insulated.
All pipes installed outdoors must be insulated according to
applicable legislation.
The water heater electronic control includes an free z e protection
function that prevents the water heater from free z ing in very
cold weather. It remains on standby and takes priority over
all other water heater functions while the water heater is
connected to the electrical mains and gas supply, i.e. it remains
enabled even when the water heater is in standby position.
To ensure that the water heater does not free z e, follow these
guidelines:
Do not unplug the power supply cord, except for routine
maintenance. The water heater has a free z e protection
function that requires electricity. The free z e protection
function will operate regardless of whether or not the
connected.
Do not close the gas valve, except for routine maintenance,
as this will limit additional free z e protection (“A” model only).
If the power or gas supplies must be disconnected for an
extended period, drain the water heater. Free
z ing damage
may occur if there is water remained in the water heater in
cold weather.
If the water heater will not be used for an extended
period, drain the water heater.
is fro z en, follow these steps:
water heater.
2. Close the gas valve.
Close
3. Open the hot water faucet that is closest to the water heater.
4. Use a hair dryer or a portable electric heater to heat up both
the primary and secondary Heat Exchangers.
5. Check every few minutes to see if water is running at the
open faucet.
heater and piping for leaks. If you detect any leaks or the
water heater is not operating properly, contact an authorise
technician or licensed professional.