Commonwealth Of Massachusetts Installation; Thermal Expansion; Water Hammer; Vacuum Breaker - TriangleTube PRESTIGE Excellence 110 Installation & Maintenance Manual

CHAPTER 2 - DOMESTIC PIPING
2.5.2 Commonwealth of Massachusetts Instal-
lation
• Thread a 3/4" close nipple onto the Auxiliary
connection and insert an open-end dip tube
into the Auxiliary connection on top of water
heater. As shown in Fig. 2 on page 4.
• Install a 3/4" NPT elbow on the Auxiliary con-
nection.
• Pipe the drain valve piping from the elbow
connection to:
Ū a suitable place for disposal
or
Ū terminate within 12" of the floor.
2.6. Manual Air Vent
• A manual air vent is factory installed.
• Open manual air vent and once the tank is full
and air has stopped escaping, close the manual
air vent.
2.7.

Thermal Expansion

If a backflow preventer, check valve or pressure reduc-
ing valve is piped on cold water supply piping of water
heater, install an expansion tank on cold water supply
line to prevent thermal expansion from repeatedly forc-
ing open T&P relief valve.
NOTICE
T&P relief valve is not intended for constant
duty, such as relief of pressure due to repeated
normal thermal expansion. Correct this con-
dition by installing a properly sized expansion
tank in the domestic water system. Refer to
expansion tank manufacturer's installation in-
structions for proper sizing.
2.8.

Water Hammer

Dishwashers, clothes washers and fast-closing positive
shut-off valves incorporated in the system all contrib-
ute to creating water shock. Install a water hammer ar-
rester to prevent damage to pipes and appliances. See
device manufacturer's instructions for application and
installation.
NOTICE
Water hammering within the domestic piping
system can cause premature failure of the inner
tank of the water heater. This type of failure is
NOT covered under warranty.
2.9.

Vacuum Breaker

Installing a vacuum breaker on the domestic cold water
inlet will prevent damage to the inner tank if a negative
pressure is developed in the domestic supply line. See
manufacturer's instructions for application and installa-
tion of the vacuum breaker.

2.10. General Piping

• For domestic water piping diagrams, see Fig. 4 and
Fig. 5 on page 7, and Fig. 6 on page 8.
• All plumbing must meet or exceed all local, state
and national plumbing codes.
• Use pipe dope or tape suitable for potable water
systems.
• Use isolation valves to isolate system components.

2.11. Domestic Piping

• Union on domestic hot water outlet should be
piped at a higher elevation than domestic water
drain valve. This will make draining the water heat-
er easier.
• Use dielectric unions or couplings to protect hot
and cold water fittings from corrosion when con-
necting dissimilar materials such as copper and gal-
vanized iron pipe.
• If copper pipe is used for domestic water connec-
tions, first solder pipe to a threaded adapter and
then screw adapter into cold water inlet on top of
Excellence. Cold Water Inlet contains an internal
plastic dip tube which can be damaged by heat
from soldering.
NOTICE
Do not apply heat to the cold water in-
let when making sweat connections to water
heater. Sweat tubing to adapter before fitting
adapter to cold water inlet of heater. It is imper-
ative that no heat be applied to the cold water
inlet, as it contains a non metallic dip tube.
5