Full Product Manual

664A0300 - Rev. B
6
Installation - Domestic Piping
Drain Valve
Drain valve and fittings are supplied by others.
Standard Installation
• Install a tee connection at the domestic cold
water inlet, as shown in Fig. 4, pages 9.
• Pipe the drain piping with drain valve from
the tee connection to:
- a suitable place for disposal
or
- terminate within 12” of the floor
Commonwealth of Massachusetts Installation
• Thread a 3/4” brass 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. 3,
page 8.
• Install a 3/4” NPT elbow to the Auxiliary
connection.
• Pipe the drain piping with drain valve from
the elbow connection to:
- a suitable place for disposal
or
- terminate within 12” of the floor
Manual Air Vent
1. Open manual air vent at the top of the unit.
Once air has stopped escaping, close the
manual air vent.
2. Once the system is completely filled and
purged of all air and sediment, check the
system pressure and check/repair any leaks.
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 expan-
sion from repeatedly forcing open T&P relief valve.
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.
Water Hammer
Dishwashers, clothes washers and fast-closing pos-
itive 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.
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 on the domestic cold
water outlet 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.
NOTICE
CAUTION