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45

Competency and Task List

Electric Heat

Students should

have knowledge

of and be able to

demonstrate pro-

ficiency in:

Electrical Safety

Electric Heat Theory

Identifying system Components

Calculating Watts

Describing how electric heating elements are rated

Describing types and how a sequencer controls heating elements and blower operation

Defining and calculating furnace BTU output

Defining Coefficient of performance

Describing sensible and latent heat

Identifying the formula for sensible heat

Describing the principles of dehumidification and humidification

Differentiating between a resistive and inductive load

Identifying the material used to construct electric heater elements

Describing the insulating properties of mica and ceramics and their application

Describing the operation and purpose of, and evaluate/replace a fan interlock switch

Describing snap discs and their sequence of operation

Describing the operation of, and evaluate/replace a limit switch

Evaluating, describing its operation, installing, and setting a pressure differential switch

Describing the effects of relative humidity on comfort and health

Explaining and measuring temperature rise

Identifying the various types of motor mounts used on residential furnace blower assemblies

Identifying the NEC code requirements for residential thermostat wiring

Describing and calculate wire sizing as it applies to voltage drop and length of wiring run

Describing voltage tolerances

Demonstrating the measurement of and determining the amp draw of electric heating element

Describing and demonstrating the method of wiring heating elements in a single-phase-system

Describing and determine the maximum allowable voltage imbalance in a three phase circuit

Measuring the voltage imbalance in a three phase circuit

Setting the heat anticipation or cycling rate for an electric furnace thermostat

Identifying the proper location for and install a conventional thermostat

Explaining the detailed wiring and operation of a setback programmable thermostat

Describing “R” values and application of various duct insulation materials

Determine system maximum allowable operating static pressure

Describing and demonstrating the method of measuring static pressure

Explain the procedures for determining CFM

Stating the recommended air velocities throughout the supply and return duct system

Stating the recommended air velocities through the return air grilles

Measure air velocities throughout the supply and return duct system

Describing the effects of static pressure on air flow

Measure the effects of static pressure on air flow

Demonstrating the procedure for finding CFM using an anemometer

Demonstrating the procedure for finding CFM using temperature rise

Stating the typical operating characteristics of a direct drive blower

Preforming blower airflow adjustments

Choosing and installing the proper bearings for a residential belt driven blower assembly

Describing and demonstrating the method of wiring heating elements in a three-phase system

(wye or delta)

Choosing and using the proper lubricant for residential blower motor maintenance