Lochinvar 45,000 - 260,000 BTU/HR service manual Check Expansion Tank, Check Relief Valve

Installation & Service Manual

7Maintenance (continued)

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, diaphragm or bladder type. See Section 4 - Water Connections for suggested best location of expansion tanks and air eliminators.

Check 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 4 - Water Connections before proceeding further.

WARNING	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.

WARNING 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 appliance 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.

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