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43

Competency and Task List

Heat Pump

Students should

have prior

knowledge of:

Refrigerant thermodynamics

Psychrometrics

Residential air conditioning and electric heating systems

Refrigerant charging

Refrigerant recovery

Soldering and brazing techniques.

Refrigerant recycling

Refrigerant reclamation

Students must

have knowledge

of Heat Pump

system

components and

be able to

demonstrate

proficiency in:

Describing a heat pump’s design, configuration for both the heating and cooling cycle

Define SEER, HSPF, and COP

Identifying and differentiate between the various types of service valves

Differentiate between a compressor designed for use in a heat pump and one that is designed

for use in a cooling only air conditioner

Demonstrating the proper connection and use of a gauge manifold assembly

Describing the operation of a reversing valve.

Describing the procedures for testing the operation of a reversing valve

Perform a reversing valve replacement

State the purpose of an accumulator and how it is constructed

Evaluate and replace a accumulator

Describing the principle of operation of a capillary tubes as used on a heat pump

Describing the principle of operation of a fixed orifice as used on a heat pump

Describing the principle of operation of a thermostatic expansion valve used with and with out

check valves

Describing the principle of operation of an electronic expansion valve

Evaluating and replacing a capillary tube

Servicing, selecting, and installing a fixed orifice

Servicing, selecting, and installing a thermostatic expansion valve

Servicing, selecting, and installing an electronic expansion valve

Describing a check valve, its function and operation

Evaluating and replacing a check valve

Describing the operation of a heat/cool relay

Describing the operation of the following defrost controls, mechanical, time/temperature, and

solid state

Describing the function of and testing method for an outdoor thermostat

Describing the sequence of the defrost cycle

Describing the sequence of operation and the testing methods for a defrost relay

Install a solid state defrost control

Stating the purpose of and testing method for a bimetal outdoor coil temperature sensor

Evaluate and replace a defrost board

Servicing and installing a thermistor type temperature sensor (PTC & NTC)

Replacing a printed circuit control board (PC) the indoor and outdoor units

Describing crankcase heating methods and how they operate

Describing a heat pump thermostat with emergency heat feature

Describing the function of and the testing method for a control circuit fuse

Explain how the set points for outdoor thermostats are established

Describing the function and the control methods used by an indoor electronic thermostat

Measure system air flow

Explain the function of a liquid line bi-flow drier