2
Maintenance
(continued)
Service Manual
25
Flue vent system and air piping
1.
Visually inspect the entire flue gas venting system and air
piping for blockage, deterioration or leakage. Repair any
joints that show signs of leakage. Verify that air inlet pipe
is connected and properly sealed.
2.
Verify that boiler vent discharge and air intake are clean
and free of obstructions.
Failure to inspect for the above conditions
and have them repaired can result in
severe personal injury or death.
Check water system
1.
Verify all system components are correctly installed and
operational.
2.
Check the cold fill pressure for the system. Verify it is
correct (must be a minimum of 12 psi).
3.
Watch the system pressure as the boiler heats up (during
testing) to ensure pressure does not rise too high.
Excessive pressure rise indicates expansion tank sizing or
performance problem.
4.
Inspect automatic air vents and air separators. Remove
air vent caps and briefly press push valve to flush vent.
Replace caps. Make sure vents do not leak. Replace any
leaking vents.
Check expansion tank
1.
Expansion tanks provide space for water to move in and
out as the heating system water expands due to
temperature increase or contracts as the water cools.
Tanks may be open, closed or diaphragm or bladder type.
See Section 6 - Hydronic Piping of the Knight Boiler
Installation and Operation Manual for suggested best
location of expansion tanks and air eliminators.
Check boiler relief valve
1.
Inspect the relief valve and lift the lever to verify flow.
Before operating any relief valve, ensure that it is piped
with its discharge in a safe area to avoid severe scald
potential. Read Section 6 - Hydronic Piping of the
Knight Boiler Installation and Operation Manual before
proceeding further.
Safety relief valves should be re-inspected
AT LEAST ONCE EVERY THREE YEARS,
by a licensed plumbing contractor or
authorized inspection agency, to ensure
that the product has not been affected by
corrosive water conditions and to ensure
that the valve and discharge line have not
been altered or tampered with illegally.
Certain naturally occurring conditions
may corrode the valve or its components
over time, rendering the valve inoperative.
Such conditions are not detectable unless
the valve and its components are
physically removed and inspected. This
inspection must only be conducted by a
plumbing contractor or authorized
inspection agency – not by the owner.
Failure to re-inspect the boiler relief valve
as directed could result in unsafe pressure
buildup, which can result in severe
personal injury, death, or substantial
property damage.
Following installation, the valve lever
must be operated AT LEAST ONCE A
YEAR to ensure that waterways are clear.
Certain naturally occurring mineral
deposits may adhere to the valve,
rendering it inoperative. When manually
operating the lever, water will discharge
and precautions must be taken to avoid
contact with hot water and to avoid water
damage. Before operating lever, check to
see that a discharge line is connected to
this valve directing the flow of hot water
from the valve to a proper place of
disposal. Otherwise severe personal injury
may result. If no water flows, valve is
inoperative. Shut down the boiler until a
new relief valve has been installed.
2. After following the above warning directions, if the relief
valve weeps or will not seat properly, replace the relief
valve. Ensure that the reason for relief valve weeping is
the valve and not over-pressurization of the system due to
expansion tank waterlogging or undersizing.
WARNING
WARNING
WARNING
