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Servicing should only be performed by a Quali
fi
ed Service Technician
The condensate trap must be
fi
lled with water during all times of water heater operation to avoid
fl
ue gas
emission from the condensate drain line. Failure to
fi
ll the trap could result in severe personal injury or death.
Check all piping for leaks
Eliminate all system or water heater leaks. Leaking water may 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 the XP Water Heater Instruction Manual.
Flue vent system and air piping
1. Visually inspect the entire
fl
ue 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 water heater 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. Watch the system pressure as the water heater heats up (during testing) to ensure pressure does not rise
too high. Excessive pressure rise indicates expansion tank sizing or performance problem.
Check expansion tank
1. Expansion tanks provide space for water to move in and out as the water expands due to temperature
increase or contracts as the water cools. Tanks may be diaphragm or bladder type. Please refer to
the System Piping section of the XP Water Heater Instruction Manual for suggested best location of
expansion tanks.
Check water heater T & P relief valve
1. Inspect the T & P relief valve and lift the lever to verify
fl
ow. Before operating any T & P relief valve, ensure
that it is piped with its discharge in a safe area to avoid severe scald potential. Please refer to the System
Piping section of the XP Water Heater Instruction Manual before proceeding further.
Safety T & P 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 quali
fi
ed service technician.
Failure to re-inspect the water heater T & P 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
fl
ow of hot water from the valve to a proper place of disposal. Otherwise severe
personal injury may result. If no water
fl
ows, valve is inoperative. Shut down the water heater until a new T &
P relief valve has been installed.
2. After following the above warning directions, if the T & P relief valve weeps or will not seat properly,
replace the T & P relief valve. Ensure that the reason for T & P relief valve weeping is the valve and not
over-pressurization of the system due to the lack of a thermal expansion tank or undersizing.
