VST VRP-150 - Connecting the Water Supply; Water Piping

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Connecting the Water Supply

Water Piping

Warning

• 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 water heater.

• Do not use lead, PVC, iron or any piping which has been

treated with chromates or other chemicals.

• Do not use this appliance if any part has been under water.

Immediately call a qualified service technician to inspect the

appliance and to replace any part of the control system and

any gas control which has been under water.

• Do not reverse the hot outlet and cold inlet connections

to the water heater. This will cause the water heater to not

operate properly.

• Make sure to install a mixing/tempering valve in your water

system in order to protect against injury. When it is required

by your local plumbing code or regulation, you must install

a mixing/tempering valve accordingly.

The water fittings on the water heater are 3/4". If the installation site

has only 1/2" plumbing throughout, it is not necessary to upsize the

water lines to 3/4", if you are installing a single water heater. When

installing multiple water heaters, the number of water heaters and

pipe sizing required will depend on the total hot water demand. For

information about pipe sizing for multiple water heaters, refer to

"Piping sizes" on page 60.

When connecting the water supply, follow these guidelines:

• Do not remove the factory installed recirculation inlet cap

unless a return line is connected to this fitting. Water leakage

will occur if this cap is loose or missing ("VRP" model only).

• Use only pipes, fittings, valves, and other components (such as

solder), that are approved for use in potable water systems.

• Tighten the water heater connection valves with care to avoid

damage.

• Use unions and manual shut-off valves on the cold water inlet,

DHW outlet, and recirculation water inlet.

• Strive to make the hot water piping system as short as possible,

so as to deliver hot water to the fixtures more quickly and

reduce heat loss.

• To conserve water and energy, insulate all water piping—

especially the hot and recirculation water lines. Never cover the

drain or pressure relief valve. If the water heater is installed in

a closed water supply system, such as one having a backflow

preventer in the cold water supply line, means shall be provided

to control thermal expansion. Contact the water supplier or

local plumbing inspector for information about how to control

this situation.

• After installing the water heater, clean the inlet water filter that

is located inside the cold water inlet, and then test the water

heater for proper flow and inspect for leaks. Instruct the water

heater owner that the filter must be cleaned periodically to

maintain proper water flow.

• When all plumbing work is completed, check for leaks and take

corrective action before proceeding.

• The following is a water piping example for the water heater:

Cold Water Supply

Hot Water Supply

Expansion tank

Gas Supply

Union

Shutoff valve

Check valve

Full port gas valve

Recirculation Line

Pressure

relief valve

Condensate drain

[VRP]

Cold Water Supply

Hot Water Supply

[VRS]

Pressure relief

valve