15
WATER SYSTEM PIPING (CONT.)
PIPING INSTALLATION
Piping, fittings, and valves should be installed according to the installation
drawing (Figure 13). 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 heater’s data plate.
If this occurs a pressure limiting valve with a by-pass 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 the Figure 14. Connect
the cold water supply (1" NPT) to the fitting marked “COLD”. DO NOT
TURN THE COLD WATER NIPPLE. THE BLACK LINE SHOULD
REMAIN ALONG THE TOP SIDE OF
THE NIPPLE. Connect the hot water
supply (1" NPT) to the fitting marked
“HOT”.
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. In residential and specific commercial
applications, 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 14. 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”.
5. Install a shutoff 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.
WARNING
DO NOT ATTEMPT TO OPERATE THIS WATER HEATER WITH THE COLD
WATER SHUTOFF VALVE CLOSED. THIS CAN RESULT IN SERIOUS DAMAGE
TO THE WATER HEATER TANK.
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