Thermostat; Tank Sensor - A.O. Smith Cirrex SUN-80 Instruction Manual

have any doubt, even the slightest doubt, in your ability to connect
the wiring to this water heater, obtain the service of a competent
electrician. Contact a local electrical contractor and/or the local
electric utility.
WATER HEATERS EQUIPPED FOR ONE VOLTAGE ONLY: This
water heater is equipped for one type voltage only. Check the
rating plate near the bottom access panel for the correct voltage.
DO NOT use this water heater with any voltage other than the
one shown on the model rating plate. Failure to use the correct
voltage can cause problems which can result in DEATH, SERIOUS
BODILY INJURY, OR PROPERTY DAMAGE. If you have any
questions or doubts consult your electric company.
If wiring from your fuse box or circuit breaker box was aluminum
for your old water heater, replace it with copper wire. If you wish
to reuse the existing aluminum wire, have the connection at the
water heater made by a competent electrician. Contact a local
electrical contractor and/or the local electric utility.
1. Provide a way to easily shut off the electric power when working
on the water heater. This could be with a circuit breaker or
fuse block in the entrance box or a separate disconnect switch.
2. Install and connect a circuit directly from the main fuse or circuit
breaker box. This circuit must be the right size and have its
own fuse or circuit breaker.
3. If metal conduit is used for the grounding conductor:
A. The grounding electrode conductor shall be of copper,
aluminum, or copperclad aluminum. The material shall be of
one continuous length without a splice or joint.
B. Rigid metal conduit, intermediate metal conduit, or electrical,
metallic tubing may be used for the grounding means if conduit
or tubing is terminated in fittings approved for grounding.
C. Flexible metal conduit or flexible metallic tubing shall
be permitted for grounding if all the following conditions
are met:
• The length in any ground return path does not exceed 6 feet
(1.8 m).
• The circuit conductors contained therein are protected by
overcurrent devices rated at 20 amperes or less.
• The conduit or tubing is terminated in fittings approved
for grounding.
• For complete grounding details and all allowable
exceptions, refer to the current edition of the Nation
Electrical Code NFPA 70.
4. A standard 1/2" (1.27 cm) conduit opening has been made in
the water heater junction box for the conduit connections.
5. Use wire nuts and connect the power supply wiring to the wires
inside the water heater's junction box.
6. The water heater must be electrically "grounded" by the installer.
A green ground screw has been provided on the water heater's
junction box. Connect ground wire to this location.
7. Replace the wiring junction cover using the screw provided.
CAUTION: If wiring from the fuse box or circuit breaker box was
aluminum for the old tank, replace it with copper wire. If you wish
to reuse the existing aluminum wire, have the connection at the
solar water heater made by a competent electrician. Contact your
local utility to arrange for a professional electrician.

THERMOSTAT

Each thermostat is factory preset at 120°F (49°C) to reduce the
risk of scald injury. This setting has proven by experience to be
most satisfactory from the standpoint of operational costs and
household needs.
Solar water heaters installed in Florida require the thermostat(s)
to be set at 125°F (52°C). If you wish to adjust the settings, see
the "Temperature Adjustment" section of this installation manual.

TANK SENSOR

The surface mount tank sensor should be attached to the sensor
stud behind the lower door by placing the hole in the sensor over
the stud provided and securing in place with a nut. The end of the
tank sensor shall be connected to the red wires in the opening with
wire nuts (with no regard for polarity). The other ends of the red
temperature sensor extension extend from the top of the tank and
shall be connected to the controller in the tank sensor position.
11
11
Figure 8.
BLACK
RED
F
(49 C)
F
F (60 C)
(66 C)
ELEMENT
Figure 9.