Water System Piping
Piping, fi ttings, and valves should be installed according to the installation drawing (Figure 6). If the indoor installation area is subject to freezing temperatures, the water piping must be properly insulated.
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
Figure 6
Water Piping Installation
| In a closed system use a | ||||||
| thermal expansion tank. | ||||||
Hot |
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| Reducing | |||||
Water |
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Outlet
Cold Water
Inlet
Union | Cold Water | |
Inlet Valve | ||
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to 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. |
1 Inch
Minimum
Drain Pan
Temperature And
Pressure Relief Valve
Discharge Line
6 Inches Maximum
Above Drain
Drain Line
3/4 Inch ID
Minimum
Drain Massachusetts: Install a 
vacuum relief in cold water line per section 19 MGL 142.
Piping Installation
1.Install the water piping and fittings as shown in Figure 6. 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 sav- ing heat traps to prevent the circulation of hot water within the pipes. Do not remove these inserts.
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 tempering valve or an
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.Install a temperature and pressure relief valve and discharge line in the opening marked “T & P RELIEF VALVE”. Install as specified under “Temperature and Pressure Relief Valve.”
7.After piping has been properly connected to the water heater, open the nearest hot water faucet 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 3 minutes after a constant flow of water is obtained. Close the faucet and check all connections for leaks.
Figure 7
Tempering Valve
Side Water Connections
Follow The Tempering | Hot | |||||||
Water Out | ||||||||
Valve’s Manufacturer’s |
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Installation Instructions |
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Tempered
Water
Tempering Valve
Set To 120° F Maximum
Cold Water In
Figure 8
Tempering Valve
Top Water Connections
Follow the tempering | Cold |
Water |
valve manufacturer’s | Inlet |
instructions |
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Hot
Water
Outlet
Tempered
Water To
FixturesTempering Valve (Set To 120° F)
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