Install Instructions

7
i. a suitable place for disposal
or
ii. terminate within 12" of the floor
C. AUTOMATIC AIR VENT
1. Remove plastic shipping cap from 1/2" NPT pipe
fitting on top center of water heater.
2. Install 1/2" x 1/8" reducer bushing provided with water
heater, using suitable pipe dope or tape.
3. Install automatic air vent provided with water heater,
using suitable pipe dope or tape.
4. Unscrew vent cap on air vent one full turn. Leave cap
unscrewed one turn for normal venting.
D. THERMAL EXPANSION
If a backflow preventer, check valve or pressure reducing
valve is piped on cold water supply piping of water
heater, install an expansion tank on cold water supply line
to prevent normal thermal expansion from repeatedly
forcing open T&P relief valve.
E. WATER HAMMER
Dishwashers, clothes washers and fast-closing positive
shut-off valves incorporated in the system all contribute to
creating water shock. Install a water hammer arrester to
prevent damage to pipes and appliances. See device
manufacturer’s instructions for application and
installation.
F. VACUUM BREAKER
Installing a vacuum breaker Watts N36-M1 or equivalent
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.
G. GENERAL PIPING
1. For domestic water piping diagrams, see Figures 3.1
through 3.4.
2. See Figures 3.5 through 3.9 for boiler water piping
3. See Figures 3.10 and 3.11 for multiple water heater
domestic piping.
4. See Figure 3.12 for multiple water heater boiler
piping.
5. See Table 1.1 for domestic and boiler piping
connection sizes.
6. All plumbing must meet or exceed all local, state and
national plumbing codes.
7. Use pipe dope or tape suitable for potable water
systems.
8. Use isolation valves to isolate system components.
H. DOMESTIC PIPING
1. 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.
2. 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.
3. If copper pipe is used for domestic water connections,
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.
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.
NOTICE
T&P relief valve is not intended for constant duty,
such as relief of pressure due to repeated normal
system expansion. Correct this condition by installing
a properly sized expansion tank in domestic water
system. Refer to expansion tank manufacturer’s
installation instructions for proper sizing.
CAUTION
Table 1.1:
Water
Heater
Model
Number
Connections - NPT 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)
PT-30 3/4 1 3/4 34 3/4 34 3/4 1
PT-40 3/4 1 3/4 43 3/4 43 3/4 1
PT-50 3/4 1-1/4 3/4 25 3/4 52 3/4 1-1/4
PT-60 3/4 1-1/4 3/4 34 3/4 62 3/4 1-1/4
PT-80 1-1/2 1-1/2 1-1/2 25 1-1/2 48 1-1/2 1-1/2
PP-120 1-1/2 2 1-1/2 32 1-1/2 61 1-1/2 2
INSTALLATION - PIPING