Install Shutoff And Mixing Valves; Connect The Water Supply; Recirculating Loop; Install Thermostatic Mixing Valves Where Required - A.O. Smith ProLine XE Installation Instructions And Use & Care Manual

INSTALLATION
Terminate the discharge pipe
3
a maximum of 12 in/300 mm
above a floor drain, sump or
other safe location. Do not drain the
discharge pipe into the drain pan;
instead pipe it separately to an
adequate drain.
DISCHARGE
PIPE
Figure 16 - The end of the T&P Relief Valve
discharge pipe must stop no more than 12
in/300 mm above a drain.
Do not place any valve or
4
other restriction between the
tank and T&P Relief Valve. Do
not cap, block, plug, or insert any valve
between the T&P Relief Valve and the
end of the discharge pipe. Do not
insert or install any reducer in the
discharge pipe.
Step 8:
Install shutoff and
mixing valves
If one is not already installed,
1
install a manual shutoff valve
in the cold water line that
supplies the water heater. Install the
shutoff valve near the water heater so
that it is readily accessible. Only use
valves that are compatible with
potable water. Use only full-flow ball
or gate valves. Other types of valves
may cause excessive restriction to the
water flow.
Install a Thermostatic Mixing
2
Valve. Consult the valve
manufacturer's instructions or
a qualified person.
DRAIN
PIPE
Figure 17 - Install Thermostatic Mixing
Valves where required.
WARNING! Even if the water
heater's thermostat(s) are set to a
relatively low temperature, hot water
can scald. Install Thermostatic Mixing
Valves to reduce the risk of scalding.
For water heaters that are fed
3
by a solar water heating
system (or any other pre-heat-
ing system), always install a Thermo-
static Mixing Valve or other tempera-
ture limiting device in the inlet water
supply line to limit water supply inlet
temperature to 140°F/60°C. Solar water
heating systems can supply water with
temperatures exceeding 170°F/77°C
and may result in water heater malfunc-
tion.
WARNING! Hot water provided by
solar heating systems can cause severe
burns instantly, resulting in severe
injury or death (page 4).
Residential Hybrid Electric Heat Pump Water Heater Use and Care Guide • 13
Step 9:
Connect the water
supply
Determine the type of water
1
pipes in your home. Most
homes use copper water pipes
or cross-linked polyethylene (PEX), but
some use CPVC. Use fittings appropriate
for the type of pipe in your home. Do
not use iron or PVC pipe – they are not
suitable for potable water.
Connect the cold water supply
2
using 3/4 inch National Pipe
Thread "NPT" to the blue cold
water connection near the bottom of
the heater.
For ease of removing the water heater
for service or replacement, connect
the water pipes with a union. We
recommend using a dielectric-type
union (available at your local plumbing
supplier). Dielectric unions can help
prevent corrosion caused by tiny elec-
tric currents common in copper water
pipes and can help extend the life of
the water heater.

Recirculating Loop

In order to optimize efficiency of this
unit, it is not recommended for use
with a recirculation loop. Using this in
a recirculation loop may cause the unit
to run excessively.