Manual

Installation - Piping
6
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 installation of the vacuum breaker.
General Piping
• For domestic water piping diagrams, see pages 8
and 9.
• See pages 10 through 13 for:
- Boiler water piping
- Multiple water heater domestic and boiler
piping.
• See Chart 1 for domestic and boiler piping
connection sizes .
• 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.
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
heater easier.
• Install unions for easy removal of water heater.
Use dielectric unions or couplings to protect
hot and cold water fittings from corrosion
when connecting dissimilar materials such as
copper and galvanized iron pipe.
• If copper pipe is used for domestic water con-
nections, first solder pipe to a threaded adapter
and then screw adapter into cold water inlet on
top of water heater. Inlet contains an internal
plastic dip tube which can be damaged by heat
from soldering.
Do not apply heat to the cold water inlet
when making sweat connections to water
heater. Sweat tubing to adapter before fit-
ting adapter to cold water inlet of heater. It
is imperative that no heat be applied to the
cold water inlet, as it contains a non metal-
lic dip tube.
NOTICE
Chart 1