A.O. Smith Solar Storage Tank Water Heater Use & Care Manual page 5

If you lack the necessary skills required to properly install
the electrical wiring to this solar storage tank water heater,
do not proceed but have a qualifi ed electrician perform the
installation.
When making the electrical connections, always make sure:
• The electrical supply has the proper overload fuse or
breaker protection.
• Wire sizes and connections comply with all applicable
codes.
• Wiring is enclosed in approved conduit (if required by local
codes).
• The solar storage tank water heater and electrical supply
are properly grounded.
Important: Do not use an extension cord to supply power
to this solar storage tank water heater. Be sure the power
supply is completely grounded before making connections.
Figures 4, 5, and 6 are provided as reference drawings
for the 120/240v 2-wire models only. Always reference the
wiring diagram located on the solar storage tank water
heater for the correct electrical connections and connect
the electrical supply to the solar storage tank water heater
in accordance with local utility requirements and codes.
When installing the electrical wiring to the solar storage
tank water heater:
1. Be sure tank is completely filled with water before
making any electrical connections. (See Figure 2)
FIGURE 2
HEATING ELEMENT
Notice: Applying electrical power to elements that are not
submerged in water will destroy them. The manufacturer
will not warranty any elements damaged in this manner.
2. Disconnect the electric power.
3. Loosen the screw holding the junction box cover to the
top of the solar storage tank water heater and set aside.
4. Connect the electrical supply to the solar storage tank
water heater in accordance with local utility requirements
and codes.
A standard 1/2 inch opening has been made in the junction
box for conduit connections.
5. Connect ground wire to green ground screw in the junction
box of the solar storage tank water heater. Reinstall the
junction box cover.
Sensor (Furnished by Installer)
Wires are provided from the sensor mounting stud to the
top of the solar storage tank. Attach the tank sensor to
these wires and mount the sensor to the solar storage tank
using the stud provided. The stud is located behind the
lower electrical access cover (See Figure 3). Connect the
two wires that exit through the top of the solar storage tank
enclosure to the solar control. These wires are designed to
be connected to an NEC CLASS II circuit only.
FIGURE 3
SENSOR MOUNTING STUD
ELEMENT
PLUG
FIGURE 4
120/240V 2-WIRE MODELS
JUNCTION BOX
COVER
WHITE WIRE (120V MODELS)
RED WIRE (240V MODELS)
FIGURE 5
WIRING DIAGRAM
120V MODELS ONLY
APPROVED CONNECTORS
BLACK
WHITE
GROUND
SCREW
SERVICE GROUND
FIGURE 6
WIRING DIAGRAM
208/240V MODELS ONLY
OVERLOAD
PROTECTION
APPROVED CONNECTORS
BLACK
RED
GROUND
SCREW
ELECTRICAL
SERVICE GROUND
WIRES TO TOP OF
HEATER
SENSOR
MOUNTING
STUD
GROUND
GREEN
WIRE
GROUND CONDUIT
SCREW
BLACK WIRE
OVERLOAD
CIRCUIT
PROTECTION
BREAKER
HOT
TO 120/160V
POWER SUPPLY
NEUTRAL
ELECTRICAL
CIRCUIT
BREAKER
L1
L2
TO 208/240V
@60Hz
1 PHASE
POWER SUPPLY
5