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Water System Piping
Piping Installation
Piping, fittings, and valves should be installed according
to the installation drawing (Figure 12). 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
pressure is stated on the water heaters 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.
1. Install the water piping and fittings as shown in
Figure 12. 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
13. These valves reduce the point of use
temperature of the water by mixing cold and hot
water and are readily available for use. Contact
a licensed plumber or the local plumbing authority.
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 (Page 13).
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).
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
Pressure Reducing
Valve with Bypass
Main
Water
Supply
Cold Water
Inlet Valve
Hot Water
Outlet
Union
Temperature and
Pressure Relief Valve
Discharge Line
6 Inches Maximum
Above Drain
Drain Line
3/4 Inch ID
Minimum
Drain
Metal
Drain Pan
1 3/4 Inch Depth Max.
1 Inch
Min.
Massachusetts: Install a
vacuum relief in cold water
line per section 19 MGL 142.
Figure 12: Water Piping Installation
Follow the tempering
Valve manufacturers
Instructions
Cold
Water
Inlet
Hot
Water
Outlet
Tempered
water to fixtures
Tempering Valve
(Set to 120
°F)
Figure 13: Typical Tempering Valve Installation
Figure 13: Typical Tempering Valve Installation
12
Cold Water Supply
to Fixtures