Water System Piping, Piping Installation

Water System Piping

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.

Water supply pressure should not exceed 80% of the working pressure of the water heater. The working

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.

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

Figure 13

Water Piping Installation

Hot Water

Outlet

Union

In a closed system use a thermal expansion tank

Cold Water Supply to Fixtures

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

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 drawn up tight.

Piping Installation

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.Some local codes may require, and 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 an expansion tank in the cold water line as specified under “Closed System/Thermal Expansion” section.

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.A temperature and pressure relief valve must be installed in the opening marked “Temperature and Pressure (T & P) Relief Valve” on the water heater. A discharge line must be added to the opening of the T&P Relief Valve. Follow the instructions under “Temperature and Pressure Relief Valve” section.

Temperature and

Pressure Relief Valve

Discharge line 6” maximum above drain

	Drain line
1”minimum	3/4” ID
	3/4” ID
	minimum	Massachusetts:


	Drain
Metal	Drain	Install a vacuum relief
		in cold water line per

Drain Pan
Drain Pan		section 19 MGL 142.
1 3/4” depth maximum		section 19 MGL 142.
1 3/4” depth maximum

Figure 14
Typical Tempering	Cold
Valve Installation	Water
	Inlet
Follow the tempering
valve manufacturer’s
instructions.
Hot
Water
Outlet
Tempered water
to fixtures
	Tempering valve
	(Set to 120°F)