75
13
Maintenance
(continued)
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 (82.7 kPa)).
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 7 - Hydronic Piping for suggested best
location of expansion tanks and air eliminators.
Check fill water meter
1. Check fill water meter for water usage. If the amount
exceeds 5% of your system volume, you could have a
leak. Have the system checked for leaks and fixed by a
qualified service technician.
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
Eliminate all system or boiler leaks.
Continual fresh makeup water will
reduce boiler life. Minerals can build
up in sections, reducing heat transfer,
overheating heat exchanger, and causing
heat exchanger failure. Leaking water
may also cause severe property damage.
1. Inspect all water and gas piping and verify to be leak free.
2. Look for signs of leaking lines and correct any problems
found.
3. Check gas line using the procedure found in Section 8
- Gas Connections.
Check all piping for leaks
⚠
WARNING
Installation & Operation Manual
Test boiler water
1. Test boiler water. Reference the Knight XL Installation
and Operation Manual for guidelines. When test indicates,
clean system water with approved system restorer following
the manufacturer’s information.
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 7 - Hydronic Piping before proceeding
further.
