Installation - Piping
6
Water hammering within the domestic pip-
ing system can cause premature failure of
the inner tank of the water heater. This type
of failure is
NOT
covered under warranty.
Vacuum Breaker
Installing a vacuum breaker Watts N36-M1 or equiv-
alent 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 manu-
facturer’s instructions for application and installation
of the vacuum breaker.
General Piping
•
For domestic water piping diagrams, see pages 8
through 10.
•
See pages 11 through 14 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.
It is recommended to 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
NOTICE
Chart 1
Water
Heater
Model
Connections (Inches)
Recirculation Dip Tube
Draining Dip Tube
Recommended
Minimum
Boiler Piping
Domestic
Water
Inlet/Outlet
Boiler Water
Supply/
Return
Auxiliary
Connection
Length
(Inches)
Diameter
(Inches)
Length
(Inches)
Diameter
(Inches)
Diameter
(Inches)
SMART 30
3/4 NPT
1 NPSC
3/4 NPSC
34
3/4
34
3/4
1
SMART 40
3/4 NPT
1 NPSC
3/4 NPSC
43
3/4
43
3/4
1
SMART 50
3/4 NPT
1 1/4 NPSC 3/4 NPSC
25
3/4
52
3/4
1
SMART 60
3/4 NPT
1 1/4 NPSC 3/4 NPSC
34
3/4
62
3/4
1 1/4
SMART 80
1 1/2 NPT
1 1/2 NPSC 1 1/2 NPSC
25
1 1/2
48
1 1/2
1 1/4
SMART 100
1 1/2 NPT
1 1/2 NPSC 1 1/2 NPSC
32
1 1/2
61
1 1/2
1 1/2
SMART 120
1 1/2 NPT
2 NPSC
1 1/2 NPSC
32
1 1/2
61
1 1/2
1 1/2
