12
Water System Piping
Piping Installation
Piping, fittings, and valves should be installed according to
the installation drawing (Figure 16). 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 should 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
16. 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 mixing valve or an anti-scald device in the
domestic hot water line as shown in Figure 17. 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.
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 ex-
cess 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.
Figure 17
Typical Mixing
Valve Installation
Follow the mixing
valve manufacturer’s
instructions.
Cold
Water
Inlet
Hot
Water
Outlet
Tempered water
to fixtures
Mixing valve
(Set to 120°F)
Metal
Drain Pan
1 3/4” depth maximum
Floor Drain
Drain line 3/4”
ID minimum
Discharge Pipe
Do Not Cap or Plug
Temperature and
Pressure Relief Valve
In a closed system use a
thermal expansion tank
Cold Water
Supply to Fixtures
Cold Water
Inlet Valve
Pressure reducing
valve with bypass
Union
Hot Water
Outlet
Massachussetts:
Install a vacuum relief
in cold water line per
section 19 MGL 142.
Figure 16
Water Piping Installation
Main water supply
6” Maximum
Air Gap
1”minimum