Kentucky Master HVAC - 595_KY Exam

1. HVAC Principles, Terminology, & General Knowledge (16%)

This domain covers the scientific foundations of the trade and the industry-standard language used in Kentucky.

Thermodynamics: Principles of heat transfer (conduction, convection, radiation), latent vs. sensible heat, and British Thermal Units (BTU).

Psychrometrics: Understanding the properties of air, relative humidity, dew point, and wet-bulb/dry-bulb temperatures.

Terminology: Sound Pressure Level (SPL), R-values (insulation resistance), and CFM (Cubic Feet per Minute) requirements.

Safety Protocols: OSHA compliance, handling of pressurized cylinders, and personal protective equipment (PPE).

2. Plan Analysis & Estimation (20%)

The largest portion of the exam, focusing on the Master’s ability to interpret engineering blueprints and calculate project needs.

Blueprint Reading: Identifying symbols for equipment, diffusers, and dampers on MEP (Mechanical, Electrical, Plumbing) plans.

Section Views: Interpreting vertical layouts and elevation details to ensure structural clearance.

Load Calculations: Using Manual J (Residential) or Manual N (Commercial) for sizing heating and cooling loads.

Duct Sizing: Interpreting Manual D to determine static pressure and friction loss.

3. Venting, Ductwork, & Combustion Air (18%)

Focuses on the movement of air and the safe exhaust of combustion byproducts.

Duct Construction: Materials, sealing requirements (Snap- and Button-lock joints), and insulation within the thermal envelope.

Venting Systems: Proper sizing and installation of Type B and Type L vents for gas appliances.

Combustion Air: Requirements for air from inside vs. outside the building to ensure proper burner operation and prevent backdrafting.

Exhaust Systems: Standards for kitchen grease hoods, bathroom exhaust, and clothes dryer venting.

4. HVAC Installation & Equipment (14%)

Covers the physical placement and setup of various heating and cooling units.

Unit Placement: Minimum clearances for furnaces, condensers, and air handlers according to the International Mechanical Code (IMC).

Installation Standards: Leveling, vibration isolation, and condensate drainage/overflow protection.

Residential vs. Commercial: Specific requirements for one- and two-family dwellings under the International Residential Code (IRC).

5. HVAC Electrical (13%)

Focuses on the power and control side of HVAC systems.

Circuit Sizing: Determining Minimum Circuit Ampacity (MCA) and Maximum Overcurrent Protection (MOCP).

Wiring Methods: Grounding, bonding, and the use of disconnects within sight of the equipment.

Control Logic: Low-voltage wiring for thermostats, relays, and safety switches (limit switches, flame sensors).

Troubleshooting: Interpreting ladder diagrams and using multimeters to test for continuity, voltage, and amperage.

6. Boilers, Exhaust, & Fire Protection (11%)

Specific systems that require specialized safety knowledge.

Boilers: Pressure relief valves, expansion tanks, and low-water cut-offs for hydronic systems.

Fire & Smoke Dampers: Installation requirements for maintaining the integrity of fire-rated assemblies and corridors.

Chimney Liners: Standards for masonry and factory-built chimneys.

7. Gas Piping (8%)

Specific focus on the National Fuel Gas Code (NFPA 54).

Pipe Sizing: Calculating pipe diameter based on BTU load, length of run, and gas type (Natural vs. Propane).

Material Standards: Allowable materials for gas lines (black iron, CSST, copper) and joint requirements.

Testing: Pressure testing protocols for gas lines before system startup.

Reference Materials (Open Book)

To succeed, candidates typically utilize the following codes and manuals:

International Mechanical Code (IMC) – Current Kentucky adopted version.

International Residential Code (IRC) – Focusing on the mechanical chapters.

NFPA 54 (National Fuel Gas Code).

Refrigeration and Air Conditioning Technology (e.g., 9th Edition).

Kentucky Business and Law Reference Manual (often required for the administrative portion of the Master license).

Note: A Master HVAC license in Kentucky permits the holder to contract for the installation of any air conditioning, warm-air heating, and ventilation system. Applicants must typically hold a Journeyman license for at least two years and maintain $500,000 in general liability insurance.

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