HVAC/R & Electrical
HVAC/R systems, electrical fundamentals,
controls, schematics and practical troubleshooting.
This section brings together the HVAC/R and electrical
training material on cmolnar.com. The emphasis is on
practical understanding: how circuits work, how HVAC
controls operate, how to use electrical test equipment,
and how to troubleshoot systems safely and logically.
Start Here
Choose between HVAC/R articles and the complete
electrical training course.
HVAC/R Articles
HVAC/R technical articles, training material,
field observations and other material related
to heating, ventilation, air conditioning
and refrigeration.
Electrical Training
A complete electrical course written for HVAC
technicians, covering electricity, circuits,
meters, relays, transformers, thermostats
and troubleshooting.
Basic Electrical for the Heating, Ventilation,
and Air Conditioning Technician
This course was developed specifically to teach
electrical theory and troubleshooting in the context
of HVAC/R work. It begins with basic electrical concepts
and progresses through real circuits, meters, controls,
relays, transformers, thermostats and troubleshooting.
The lessons are designed to connect theory to the kinds
of circuits and components technicians encounter in the
field rather than treating electricity as an isolated
academic subject.
Electrical Training Topics
The course progresses from electrical fundamentals
through controls and troubleshooting.
1. Electrical Fundamentals
2. Understanding Circuits
3. Electrical Test Equipment
Learn to measure voltage, current and resistance
and use those measurements to understand what
a circuit is doing.
4. Relays & Controls
5. Transformers
6. Thermostats
Heating and cooling thermostats, sensing elements,
control operation and thermostat wiring.
7. Troubleshooting
A practical approach to diagnosing circuits while
keeping electrical safety at the center of the process.
8. Schematics & Symbols
Use schematic diagrams and electrical symbols to
understand circuit operation before troubleshooting
equipment in the field.
Learn by Building and Troubleshooting
Electrical theory becomes much easier to understand
when it is connected to an actual circuit.
Build Circuits
The training course includes shop exercises for
basic, series, parallel, relay and transformer
circuits so that electrical theory can be connected
directly to circuit behavior.
Measure What the Circuit Is Doing
Understanding voltage, current and resistance
measurements is fundamental to diagnosing electrical
problems rather than simply replacing parts.
Understand HVAC Controls
Relays, transformers and thermostats form much of the
control system found in traditional HVAC equipment.
Understanding how each operates makes control
troubleshooting considerably easier.
Troubleshoot Logically
Good electrical troubleshooting is a process:
understand the circuit, make measurements,
compare those measurements with expected operation,
and isolate the fault.
HVAC/R Articles & Training
The electrical course is only one part of the HVAC/R
material on cmolnar.com. The HVAC/R archive also includes
technical articles, training material and observations
related to the trade.
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Return to the main site or continue into the
complete electrical training manual.