Solar Installation; Electrical Connections And Wiring Diagram - A.O. Smith HIGH EFFICIENCY ATMOSPHERIC VENTGAS WATER HEATER Use & Care Manual

Residential gas water heaters
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A diaphragm-type expansion tank suitable for potable
water will normally eliminate this weeping condition.
Please read and follow the manufacturer's instructions for
the installation of such tanks.
Must Be Vertical To
Domestic
Remove Air Bubbles
Hot Water
Out
Vacuum
Relief
Mixing
Valve
Valve
Hot
Water
Out
Unions
Typical Mixing Valve Installation Combination
Space Heating/Potable Water Heating System
Also see Water System Piping for additional instructions on
the safe and correct installation and operation of this water
heater.

Solar Installation

If this water heater is used as a solar storage heater
or as a backup for the solar system, the water supply
temperatures to the water heater tank may be in excess of
120°F. A mixing valve or other temperature limiting valve
must be installed in the water supply line to limit the supply
temperature to 120°F.
NOTE: Solar water heating systems can often supply
water with temperatures exceeding 180°F and may result
in water heater malfunction.
Wiring Diagram
Air Intake
Chamber Fan
Expansion Tank
Cold Water Inlet
Flow Control
Pump
Valve
Out
Coil
To Air
Handler
Air
Shut-Off
Handler
Valve
MASSACHUSETTS CODE
DOES NOT ALLOW THIS
TYPE OF INSTALLATION.
FIGURE 16
Gas Control
Valve / Thermostat
Pressure
Switch
Igniter/Flame
Sense Connector
Electrical Connections
In
Before plugging in the water heater, always make sure:
The Voltage and frequency correspond to that specified
on the water heater.
The electrical outlet has the proper overload fuse or
breaker protection.
Unit is to connect to a 120VAC electrical supply outlet
(extension cord is not allowed).
IMPORTANT: Do not use an extension cord to connect the
water heater to an electrical outlet.
The water heater and the outlet are properly grounded.
Installed in accordance with prevailing provisions of
local codes, or in the absence of such, National Electric
Code, ANSI/NFPS 70 current edition.
Completely fill the tank with water and check all con-
nections for leaks. Open the nearest hot water faucet and
let it run for three (3) minutes to purge the water lines of
air and sediment and to ensure complete filling of the tank.
The Electrical power may then be turned on. Verify proper
operation after servicing.
CAUTION:
LABEL ALL WIRES PRIOR TO
DISCONNECTION WHEN SERVICING
CONTROLS. WIRING ERRORS CAN CAUSE
IMPROPER AND DANGEROUS OPERATION.
VERIFY PROPER OPERATION AFTER SERVICING.
18
WARNING
Electric Shock Hazard
Disconnect power before
servicing.
Replace all parts and panels
before operating.
Failure to do so can result in
death or electrical shock.
Control Display
CAUTION:
DO NOT USE AN EXTENSION
CORD TO CONNECT THE
TRANSFORMER TO AN
ELECTRICAL OUTLET.
FV
Sensor
Power Supply
Transformer
Anode
Rod

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