18 Maintaining the Boiler
Note
●
If hot water will not flow and you
suspect that the boiler is frozen,
contact an authorized technician or
licensed professional.
●
This boiler requires very little
maintenance, however a qualified
technician should inspect the boiler at
the beginning of every heating season
and/or when there is a problem.
CAUTION
If the unit will not be used immediately, close off
all gas and water shutoff valves, drain all of the
water out of the unit and the plumbing system
to prevent the unit and system from freezing,
and bleed the gas out of the gas line.
4.7 Maintenance Schedules
Regular maintenance is required to operate the
boiler safely. Refer to the maintenance schedules
below for proper maintenance of the boiler.
Owner maintenance
Daily
●
Check the boiler area
is free of combustible/
flammable materials and air
contaminants.
●
Check the pressure/
temperature gauge for
signs of higher than normal
pressure.
Monthly
●
Visually inspect the vent
piping for signs of leakage
and blockage.
●
Visually inspect the burner
flames.
●
Inspect the condensate trap
and the PVC fittings.
Periodically
●
Test the LWCO for proper
operation.
Every 6
months
●
Inspect boiler piping (gas and
water) for leaks.
●
Test to make sure the relief
valve is operating normally.
Non-heating
season
●
Shut boiler down (unless
boiler is used for domestic hot
water).
4.6 Protecting the Boiler from
Freezing
CAUTION
Damage due to freezing is not covered by the
Navien limited warranty.
●
Freezing damage is most likely to occur due
to back drafting caused by negative pressure
in the building. This is not a manufacturing
defect, and therefore, Navien will not
warrant any damages due to freezing. The
installer is responsible for ensuring that
there is sufficient make-up air to avoid such
a situation and the owner is responsible for
ensuring that protection against freezing is
maintained.
●
To avoid freezing issues, we strongly
recommend the use of a direct vent exhaust
and intake system. Your installer should
ensure that the exhaust vent pipe and the
air intake pipe are both connected directly
from the collars on the top of the boiler to the
outdoors. This type of vent system minimizes
air movement within the boiler.
●
This boiler has an optional recirculation mode
that is used for freeze protection. This mode
should prevent the boiler from freezing, even
if the intake air duct is not vented directly.
●
The boiler is designed for indoor installation
only.
To ensure that the boiler does not freeze, follow
these guidelines:
●
Do not unplug the power supply cord,
except
for routine maintenance. The boiler has a freeze
protection function that requires electricity. The
freeze protection function will operate regardless
of whether or not the power is turned on or off, as
long as the electric supply is still connected.
●
Do not close the gas valve,
except for routine
maintenance, as this will limit additional freeze
protection.
●
If the boiler will not be used for an extended
period, drain the boiler.
If the power or gas supplies must be
disconnected for an extended period, drain the
boiler. Freezing damage may occur if there is
water remained in the boiler in cold weather.
Summary of Contents for NCB-190/060H
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