Bradford White Everhot IGE-199C Series Installation And Operating Instruction Manual page 15

Recommended Piping for Power Failure Freeze Protection
As long as electrical power and gas are supplied to the EVERHOT® water heater, freeze protection is
provided to the heat exchanger and piping inside the water heater with ambient temperatures as cold as -
30°F (-34°C), when protected from direct wind exposure. In the event of a power failure at temperatures
below freezing, the water heater must be drained of all water to prevent freeze damage. The water
heater may be drained manually, or automatically, through the installation of the optional solenoid valves
as shown in the following illustration. The drain solenoids are recommended for very cold climates to
prevent water heater freeze damage where power failures from ice and windstorms occur.
The electrical connections for the two solenoids must be tied to the 120 volt main power supply terminals
provide on the PCB board. When the electrical power to the water heater fails, the ¾" solenoid on the
cold water inlet pipe closes, stopping water flow into the water heater. The ¼" solenoid opens, allowing
the water heater and connected piping to drain. Make sure the piping from the drain solenoid is run to a
suitable drain or outside the building to prevent water damage.
Drain Solenoid Piping (Fig. 3)
CAUTION
All piping located outside the building must be insulated and wrapped with heat tape to prevent freezing.
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