Water System Piping

Piping Installation

Piping, fittings, and valves should be installed according to the installation drawing (Figure 13). If the indoor installation area is subject to freezing temperatures, the water piping must be protected by insulation.

7.After piping has been properly connected to the water heater, remove the aerator at the nearest hot water faucet. Open the hot water faucet and allow the tank to completely fill with water. To purge the lines of any excess air, keep the hot water faucet open for 3 minutes after a constant flow of water is obtained. Close the faucet and check all connections for leaks.

Water supply pressure should not exceed 80% of the working pressure of the water heater. The working pressure is stated on the water heater’s data plate. If this occurs, a pressure limiting valve with a bypass may need to be installed in the cold water inlet line. This should be placed on the supply to the entire house in order to maintain equal hot and cold water pressures.

Important: Heat cannot 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.

Important: Always use a good grade of joint compound and be certain that all fittings are drawn up tight.

Figure 13

Water Piping Installation

Hot Water

Outlet

Union

In a closed system use a

thermal expansion tank

Cold Water

Supply to Fixtures

	Main
	Water
Cold Water	Supply
Cold Water	Pressure reducing
Inlet Valve	valve with bypass

Temperature and

Pressure Relief Valve

Discharge line 6” maximum above drain

1.Install the water piping and fittings as shown in Figure 13. Connect the cold water supply (3/4” NPT) to the fitting marked “C”. Connect the hot water supply (3/4” NPT) to the fitting marked “H”.

Important: Some models may contain energy saving heat traps to prevent the circulation of hot water within the pipes. Do not remove the inserts within the heat traps.

2.	The installation of unions in both the hot and cold
	water supply lines is recommended for ease of
	removing the water heater for service or
	replacement.
3.	The manufacturer of this water heater recommends
	installing a tempering valve or an anti-scald device
	in the domestic hot water line as shown in Figure
	14. These valves reduce the point-of-use
	temperature of the water by mixing cold and hot
	water and are readily available for use.
4.	If installing the water heater in a closed water
	system, install a relief valve or expansion tank in
	the cold water line as specified under “Closed
	System/Thermal Expansion” (Page 13).

	Drain line
	3/4” ID
1” min.	minimum
Metal	Drain
Metal
Drain Pan
1 3/4” depth max.

Figure 14

Typical Tempering

Valve Installation

Follow the tempering valve manufacturer’s instructions.

Hot

Water

Outlet

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

Cold

Water

Inlet

5. 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.

6. Install a temperature and pressure relief valve in

the opening marked “Temperature and Pressure

(T & P) Relief Valve” on the water heater. Add a

discharge line to the opening of the T & P relief

valve. Follow the instructions under “Temperature

and Pressure Relief Valve" (Page 14).

Tempered water to fixtures

Tempering valve (Set to 120°F)