American Water Heater HPE10280H045DV, HPE10260H045DV Water Piping System, Piping Installation

Water Piping System

Piping, fittings, and valves should be installed according to the installation drawing (Figure 2). If the indoor installation area is subject to freezing temperatures, the water piping must be properly insulated.

Water supply pressure should be 50-60 PSIG (.35 MPa) and not exceed the maximum 80 PSIG (.55 MPa). If the supply line pressure exceeds 80 PSIG (.55 MPa), a pressure reducing valve (PRV) with a bypass should be installed in the cold water supply line. This should be placed on the supply to the entire house in order to maintain equal hot and cold water pressures.

IMPORTANT:

•Heat must not be applied to the water fittings on the heater as they may contain nonmetallic parts. If solder connections are used, solder the pipe to the adapter before attaching the adapter to the hot and cold water fittings.

•Always use a good grade of joint compound and be certain that all fittings are tight.

IMPORTANT: DO NOT over apply joint compound.

Piping Installation

1.Install the water piping and fittings as shown (Figure 2). Connect the cold water supply (3/4” NPT) to the fitting marked “Cold”. Connect the hot water supply (3/4” NPT) to the fitting marked “Hot”.

2.The installation of unions in both the hot and cold water supply lines are recommended for ease of removing the water heater for service or replacement.

3.Some local codes may require, and the manufacturer of this water heater recommends, installing a mixing valve or an anti-scald device in the domestic hot water line as shown (Figure 2), or at the point of use. These valves reduce the point-of-use temperature of the hot water by mixing cold and hot water and are readily available. Contact a licensed plumber or the local plumbing authority for more information.

4.Some local codes may require, and the manufacturer of this water heater recommends, installing a pressure reducing valve (PRV) in the cold water inlet line where it enters the residence as shown (Figure 2).

5.If installing the water heater in a closed water system, install an expansion tank in the cold water line as specified under “Closed System/Thermal Expansion” (p.10).

6.Install a shut off valve in the cold water inlet line. It should be located close to the water heater and be easily accessible. Know the location of this valve and how to shut off the water to the heater.

7.Install a discharge line from the temperature and pressure relief valve in the opening marked “T & P RELIEF VALVE”. See Figure 3 and the “Temperature and Pressure Relief Valve” (p.10)

8.After piping has been properly connected to the water heater, open the nearest hot water faucet. Then open the cold water shut off valve and allow the tank to completely fill with water. To purge the lines of any excess air and sediment, keep the hot water faucet open for three (3) minutes after a constant flow of water is obtained. Close the faucet and check all connections for leaks.

Figure 2

Temperature and Pressure Relief Valve

Discharge Pipe

(Do Not Cap or Plug)

Union

Union

Shut-off Valve (Hot)

Untempered Water Outlet

Hot

(Outlet) Mixing Valve - Follow the Mixing Valve’s Manufacturer’s Installation Instructions.

(Set to 120° F)

Tempered Water to Fixtures Condensate Drain Lines*

Cold Water Outlet

Massachusetts: Install a vacuum relief in cold water line per section 19 MGL 142.

Vacuum Relief Valve

Cold Water

Inlet Valve

Cold Water

Inlet

Pressure Reducing Valve (PRV) should be installed where the water supply enters the residence.

Metal Drain Pan 2 1/2”
Depth Maximum and
2 Inches wider than	Cold
the water heater.	(Inlet)
		Shut-off Valve
		(Cold)
Drain Line 3/4”	Drain	6” Maximum
ID Minimum		Air Gap

In a closed system, use a thermal expansion tank. See “Closed System/ Thermal Expansion” section.

*If an adequate drain is not available for the condensate drain lines then a condensate pump should be used. DO NOT discharge the condensate drain lines into the metal drain pan.

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