American Water Heater STCE3-52/80/119 ユーザーズマニュアル

Servicing should only be performed by a Qualified Service Agent

10

This section of the manual will cover the principles of electricity, single and three phase 
power, fuses, surface mount thermostat/ECO combination controls, heating element 
construction & operation, heating element sensors, contactors, common service procedures 
and more. Information and service procedures presented in this section will be referenced in 
the troubleshooting sections.

The unit of measurement used to quantify electrical pressure or the force that causes 
electrical energy to flow is the volt or voltage. Volt meters are used to determine if there is an 
adequate supply of electricity or voltage to a heating element.

The unit of measurement used to quantify the rate at which electrical current is flowing is the 
ampere or amp. Amp meters are used to determine if a heating element is working - if there 
is adequate current flowing through the heating element.

The unit of measurement used to quantify the opposition or “resistance” to the flow of 
electricity is the ohm. As resistance (ohms) in an electrical circuit increases current 
(amperage) will decrease and as resistance decreases current will increase. Ohm meters 
are used for measuring the resistance of heating elements, for open circuit continuity tests 
on heating elements and for shorted to ground continuity tests on heating elements.
Service Note: Volt, ohm and amp meter test instruments are necessary to perform the 
service and diagnostic procedures outlined in this manual - see Tools Required on page 3.

The unit of measurement used to quantify the rate or amount of electrical energy being used 
is the watt. One thousand watts is referred to as one kilowatt. Heating elements are rated in 
kilowatts expressed as KW. The higher the kilowatt rating of a heating element the more 
power it will use and the more heat it will generate. One kilowatt generates 3412 Btu of heat.