Bradford White TGHE-199I-N - Manual (Page 18)

18
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
-22
F (-30C), when protected from direct wind exposure. In the event of a power failure with ambient
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 (black
and white wires). 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 drain 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.
CAUTION
Heat trace all water pipe and fittings located outside the home (attic, crawl space) or building
structure. All pipe and fittings shown below dashed line (see Figure 6) should be located inside
home or building structure. The vacuum breaker line should be located inside the building structure.
Figure 6.
Recommended Piping for Freeze Protection.