AR HVAC study guide
AR HVAC · Work through your exam, one topic at a time.
The Arkansas HVAC-R licensing examination is the assessment tied to state licensure for work on heating, ventilation, air conditioning and refrigeration systems in Arkansas. It is intended for technicians and contractors who need to demonstrate trade competence before practicing, and it appears within the licensing structure of the Arkansas Department of Labor and Licensing. The AR HVAC study guide has 4 sections and about 1,455 words.
01Fundamentals, Safety, and Tools
Heat is measured in Btu; one Btu raises one pound of water 1°F. Sensible heat changes the temperature of air and is read with a thermometer; latent heat changes state and shows up as moisture removed.
364 words, about 2 min02Refrigeration Cycle, Components, and Refrigerants
The cycle has four functions: compression (low-pressure vapor to high-pressure vapor), condensation (rejecting heat, vapor to liquid), metering (pressure drop), and evaporation (absorbing heat, liquid to vapor). Trace it on a pressure-enthalpy diagram and know the states: desuperheated vapor leaving the compressor, subcooled liquid leaving the condenser, a flash-gas mixture after the metering device, and superheated vapor leaving the evaporator.
343 words, about 2 min03Electrical Systems and Controls
Every electrical question reduces to E = I × R , P = E × I , and P = I² × R for single phase; three-phase power is 1.732 × E × I × power factor . Voltage is measured in parallel with the load; current is measured in series by clamping one conductor only; resistance and continuity are measured with the circuit de-energized.
384 words, about 2 min04Installation, Service, Load Calculation, and Code/Regulations
The correct sequence is Manual J (room-by-room load), Manual S (equipment selection within capacity), then Manual D (duct design). Square-foot rules of thumb are explicitly discouraged because orientation, glazing, insulation, infiltration, and internal gains dominate.
364 words, about 2 min