Water System Piping, Piping Installation

WATER SYSTEM PIPING

Piping Installation

Piping, fittings, and valves should be installed according to the installation drawing (Figure 22). If the indoor installation area is subject to freezing temperatures, the water piping must be protected by insulation.

The water supply pressure should not exceed 80 psi. If this occurs, a pressure reducing 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.

1.Install the water piping and fittings as shown in Figure 22. Connect the cold water supply (3/4” NPT) to the cold water inlet fitting. Connect the hot water supply (3/4” NPT) to the hot water outlet fitting.

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 mixing valve or an anti-scald device in the domestic hot water line as shown in Figure 23. 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.”

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.”

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.

IN A CLOSED SYSTEM USE A

THERMAL EXPANSION TANK

COLD WATER SUPPLY TO FIXTURES

PRESSURE REDUCING VALVE

WITH BYPASS

HOT WATER	COLD WATER
OUTLET	INLET

COLD WATER INLET VALVE (SHUT-OFF VALVE)

	TEMPERATURE AND PRESSURE (T&P)
	RELIEF VALVE (OPTIONAL TOP T&P
	RELIEF VALVE NOT SHOWN)
	DISCHARGE PIPE
	(DO NOT CAP OR PLUG)
			MASSACHUSETTS: INSTALL
	DRAIN LINE		A VACUUM RELIEF IN COLD
	3/4” ID		WATER LINE PER SECTION
1” MINIMUM	MINIMUM		19 MGL 142.
1” MINIMUM
METAL		6” MAXIMUM
DRAIN PAN		AIR GAP
DRAIN
FIGURE 22.
	TEMPERED WATER
UNTEMPERED	TO FIXTURES
UNTEMPERED
HOT WATER			COLD
			COLD
			WATER
			INLET

HOT

WATER

OUTLET

MIXING VALVE (SET TO 120°F)

FOLLOW THE MIXING

VALVE MANUFACTURER’S

INSTRUCTIONS

FIGURE 23.

Please note the following:

•The system should be installed only with piping that is suitable for potable (drinkable) water such as copper, CPVC, or polybutylene. This water heater must not be installed using iron piping or PVC water piping.

•Use only pumps, valves, or fittings that are compatible with potable water.

•It is recommend that only full flow ball or gate valves are used in water piping installations. The use of valves that may cause excessive restriction to water flow is not recommended.

•Use only 95/5 tin-antimony or other equivalent solder. Any lead based solder must not be used.

•Piping that has been treated with chromates, boiler seal, or other chemicals must not be used.

•Chemicals that may contaminate the potable water supply must not be added to the piping system.

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