Water Connections; Pressure Relief Valve - American Water Heater 240HX3 Installation Manual And Owner's Manual

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Table Of Contents

Table of Contents

Do not use this appliance if any part has been under water. Immediately contact a qualified

installer or service agency to replace a flooded water heater. Do not attempt to repair the unit!

It must be replaced!

WARNING

Do not reverse the hot outlet and cold inlet connections to the water heater. This will prevent

NOTICE

the water heater from activating properly.

All pipes, pipe fittings, valves and other components, including soldering materials, must be suitable for potable

water systems.

1. A manual shutoff valve must be installed on the cold water inlet to the

water heater between the main water supply line and the water heater.

2. In addition, a manual shutoff valve is also recommended on the hot wa-

ter outlet of the unit.

3. If the water heater is installed within, or subjected to, a closed loop wa-

ter system, a thermal expansion tank or code approved device to handle

thermal expansion must be installed.

NOTE: If the plumbing system is subject to water hammer, then it is

recommended that water hammer arrestors be installed.

4. Before installing the water heater, flush the water line to remove all debris, and after installation is complete,

purge the air from the line. Failure to do so may cause damage to the heater.

5. There is a wire mesh filter within the cold inlet to trap debris from entering your heater. This will need to be

cleaned periodically to maintain optimum flow. (Refer to page 49.)

The water heater has a high-temperature shutoff switch built in as a standard safety feature (called a Hi-Limit

switch) therefore a "pressure only" relief valve is required.

• This unit does not come with an approved pressure relief valve.

• An approved pressure relief valve must be installed on the hot water outlet.

• The pressure relief valve must conform to ANSI Z21.22/CSA 4.4 and installation must follow local codes.

• The discharge capacity must be at least 160,000 BTU/h for the 240HX3 model, 180,000 BTU/h for the

340HX3 model, and 199,000 BTU/h for the 540HX3 model.

• The pressure relief valve needs to be rated for a maximum of 150 psi (1 MPa).

• The discharge piping for the pressure relief valve must be directed so that the hot water cannot splash out-

ward and cause damage or personal injury.

• Attach the discharge tube to the pressure relief valve and run the end of the tube to within 6 in (152

mm) from the floor. This discharge tube must allow free and complete drainage without any restrictions.

WARNING! Do Not plug the pressure relief valve.

• If the pressure relief valve discharges periodically, this may be due to thermal expansion in a closed water

supply system. Contact the water supplier or a local plumbing professional on how to correct this situation.

• The pressure relief valve must be manually operated periodically to check for correct operation. Before

operating the valve manually, check that it will discharge in a place for secure disposal.

• No valve must be placed between the relief valve and the water heater.

Hot water could be released when the pressure relief valve is opened. This could

result in severe personal injury. Before operating the pressure relief valve manually,

check that it will discharge in a safe place. If water does not flow freely from the end

of the discharge pipe, turn the gas supply and power OFF and call a qualified person

WARNING

to determine the cause.

Refer to the pressure relief valve manufacturer's instructions for inspection and main-

tenance requirements.