Water System Piping
Piping, fittings, and valves should be installed according to the installation drawing (Figure 4). If the indoor installation area is subject to freezing temperatures, the water piping must be properly insulated.
Water supply pressure should be
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 in Figure 4. 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
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 in Figure 4.
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.”
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 5 and the “Temperature and Pressure Relief Valve” section.)
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 3 minutes after a constant flow of water is obtained. Close the faucet and check all connections for leaks.
Figure 4
Water Piping Installation with Mixing Valve
Heat Trap - The top of the heat trap | Massachusetts: Install a vacuum relief in cold | |
must be higher than the storage tank | water line per section 19 MGL 142. | |
of the water heater. |
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Vacuum Relief Valve | ||
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Temperature and Pressure Relief Valve
Discharge Pipe
(Do Not Cap or Plug)
Union
Union
Untempered Water Outlet
Hot
(Outlet) Mixing Valve (Optional) - Follow the Mixing Valve’s Manufacturer’s Installation
Instructions. (Set to 120° F)
Tempered Water to Fixtures Condensate Drain Lines*
Cold Water Outlet
Cold Water
Inlet Valve
Cold Water
Inlet
Whole House Pressure Reducing Valve (PRV) should be installed where the water supply enters the residence.
Metal Drain Pan 2 1/2” |
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Depth Maximum and |
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2 Inches wider than | Cold |
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the water heater. | (Inlet) |
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| (Cold) | |
Drain Line 3/4” | Drain | 6” Maximum | |
ID Minimum | Air Gap | ||
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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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