排水与冲洗Draining and Flushing
The water heater should be drained if being shut down during freezing temperatures. It is recommended that the tank be drained and flushed every 6 months to remove sediment which may buildup during operation. To drain the tank perform the following steps:
Turn off the power to water heater.
Close the cold water inlet valve and open a nearby hot water faucet.
Connect a hose to the drain valve and terminate it to an adequate drain.
Open the water heater drain valve and the nearest hot water faucet. Allow all the water to drain from the tank. Flush the tank with water as needed to remove sediment.
Close the drain valve and refill the tank, and restore power.
Important: Drain hose should be rated for at least 200°F. If the drain hose does not have this rating, open the cold water inlet valve and open a nearby hot water faucet until water is no longer hot.
If the water heater is going to be shut down for an extended period, the drain valve should be left open.
NOTE: When draining Table Top models, remove the screw securing the drain access cover. Remove the cover by pulling down and away from the water heater.
Heating Element Replacement
Electric Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electric shock.
Replacement heating elements must be of the same style and voltage/wattage rating as the ones presently in the water heater. This information can be found on the flange or terminal block of the element or on the water heater data plate.
Shut off the electric power to the water heater.
Drain the water heater as directed under "Draining and Flushing".
Remove the access cover(s). Fold the insulation outward and away from the heater element(s). Remove the plastic thermostat cover from the thermostat(s) making sure to disengage the attachment point from the thermostat.
Disconnect the electric wires from the heating element (Figure 13). Remove the screw-in elements by turning the element counterclockwise with an 1-1/2 inch socket wrench. Remove the existing gasket.
Clean the area where the gasket fits to the tank. If you are replacing the bottom element, remove the accumulated sediment on the bottom of the tank.
Make sure the replacement element has the correct voltage and wattage rating. Position the new gasket on the element and insert it into the water heater tank (Figure 14). Tighten the element by turning it clockwise until secure.