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HVAC Training
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The HVAC Interview: Preparing and Dressing for Success
https://www.acservicetech.com/post/the-hvac-interview-preparing-and-dressing-for-success
Published: February 26, 2026 17:32
Landing a job in HVAC is unique because every employer has a different philosophy on professionalism. For some, the goal isn't just to look good—it’s to look capable. Here is how to balance a sharp presentation with a "ready-to-work" attitude. 1. The…
How to Read a Tape Measure in Inches and Fractions!
https://www.acservicetech.com/post/how-to-read-a-tape-measure-in-inches-and-fractions
Published: July 30, 2025 20:17
When teaching students how to use and read a tape measure for the first time, I have a go-to set of items to facilitate the training. I use 13 pieces of wood with 26 measurements labeled A-Z. Each piece has two letters, one for each dimension to be…
Make Sure to Connect You Gauge Quickly To Prevent Contamination!
https://www.acservicetech.com/post/make-sure-to-connect-you-gauge-quickly-to-prevent-contamination
Published: July 15, 2025 13:06
If you remove the vapor access port cap on a running air conditioning system, the low temperature brass on the inside of the port will condense water vapor from the air surrounding the port directly onto the port. This is because the air surrounding the…
Do You Need Locking Caps On Refrigerant Access Ports!
https://www.acservicetech.com/post/do-you-need-locking-caps-on-refrigerant-access-ports
Published: July 15, 2025 12:54
After servicing or adding refrigerant to an air conditioning system, add locking caps to the service ports if the system is in an accessible area. This reduces the chance of someone tampering with the refrigerant charge. The IMC code that requires this may…
Quickly Check For Condensate Clogs and Issues During no A/C Service Calls!
Published: July 2, 2025 19:39
There are a number of factors that lead to a residential NO A/C service call, so make sure to rule out the condensate line/switches! These switches may be wired to break either the R wire which is the 24V power to the thermostat or the Y wire heading to…
Seeing the TXV Metering Device Operate Using A Water Stream!
https://www.acservicetech.com/post/seeing-the-txv-metering-device-operate-using-a-water-stream
Published: January 24, 2025 14:13
The purpose of this HVACR training project is to visually show your students the change in the amount of liquid flowing through a TXV or Piston Metering Device during operation. Using water as the liquid during this experiment helps them visually see this…
5 Methods to Determine if The Indoor Air Conditioning Coil is Clogged with Dust!
Published: July 24, 2024 12:49
When servicing an air conditioner or heat pump, we often notice a low airflow problem which needs to be fixed. If there is no indoor air filter or there is air skirting around the air filter because its not snugly fit, the dust will collect on the side of…
Measuring the Static Pressure Drop Across an Evaporator Coil to See if it is Clogged!
Published: July 3, 2024 13:45
If you suspect that an evaporator coil is clogged with dust but cannot visually see it, such as when you can't directly inspect on a furnace and evaporator coil , static pressure measurements can be used to determine if the pressure drop is too high. This…
Measuring Airflow in CFM Using the TrueFlow Grid
https://www.acservicetech.com/post/measuring-airflow-in-cfm-using-the-trueflow-grid
Published: December 13, 2023 21:46
Measuring airflow is one of the most commonly missed or ignored topics in HVAC when commissioning or diagnosing problems in systems. I don't believe this topic is purposely ignored due to lazyness or just wanting to reduce the time on service calls. I…
Carbon Monoxide Alarm vs Low Level CO Monitor
https://www.acservicetech.com/post/carbon-monoxide-alarm-vs-low-level-co-monitor
Published: November 29, 2023 15:06
Today most people are aware of the invisible, odorless, poisonous gas of Carbon Monoxide or CO for short. Now we know that even low levels of CO can have long term health effects depending on exposure time, the health and age of the exposed person. Carbon…
Top 10 Gas Furnace Package Unit Problems!
https://www.acservicetech.com/post/gas-furnace-package-unit-top-10-problems
Published: November 1, 2023 19:28
Problem #1: No Power to the Package Unit On all HVAC systems, power is critical to operation, and a package unit is no different. There several reasons a package unit may lose power, but fortunately determining if this is the problem can be done fairly…
UNCONFORMED Review (Quick Tip)
https://www.acservicetech.com/post/unconformed-quick-tip
Published: September 20, 2023 15:02
I just finished reading the book Unconformed, by Bryan Orr, from HVAC School. I invested about 5 hours spread over three days and let me...
ECM Fan Motor Troubleshooting for Constant Torque Motors: X-13 and Broad Ocean
Published: September 6, 2023 16:08
ECM “constant torque” fan motors can be easily identified by noticing their spade terminal plug ends. However, make sure to read the motor's rating plate to verify this. These fan motors may also be referred to as ECM multi-speed fan motors. Technicians…
The Directional Flow of Refrigerant in a Heat Pump During AC Mode (Quick Tip)
Published: August 4, 2023 17:00
(This image is courtesy of our friend JD Kelly @student_of_hvac ) In this refrigerant flow diagram, we see a simplistic piping arrangement for a heat pump running in cooling mode. When we take the complexity away, such as in this drawing, it allows a newer…
Simple Low Voltage Thermostat Wiring to Control an Indoor Blower Motor (Quick Tip)
Published: August 4, 2023 16:59
(This image is courtesy of our friend JD Kelly @student_of_hvac ) This drawing shows how a low voltage wiring circuit can control a high voltage, high current load, such as a blower motor. Make sure to show this pic to your new apprentices! Remember that a…
HVAC Training For Thermostat Operation, Wiring, & Multimeter Use!
https://www.acservicetech.com/post/hvac-training-for-thermostat-operation-wiring-multimeter-use
Published: July 27, 2023 14:19
This short project is designed to show how to teach thermostat operation and wiring to a newer HVAC technician or a student in a mobile and easy to understand format. This particular project covers how a thermostat controls a gas furnace and air…
10 Methods to Clean Condensate Drains/Traps on Air Conditioners
https://www.acservicetech.com/post/10-methods-to-clean-condensate-drains-traps-on-air-conditioners
Published: May 10, 2023 13:54
Cleaning Condensate Traps and Drain Lines!
EEV Electric Expansion Valve Training Project
https://www.acservicetech.com/post/eev-electric-expansion-valve-training-project
Published: March 29, 2023 19:29
Explaining how an EEV operates is much easier when you can show exactly what is happening, each step of the way. This project is meant to simplify the operation of the EEV by visually showing the internal pin movement as 12V power is temporarily applied to…
Pressure Transducer Training Project
https://www.acservicetech.com/post/pressure-transducer-training-project
Published: March 29, 2023 19:29
This training project is designed to provide a clear way to see how a pressure transducer operates and how they can be tested. Why does the Pressure Transducer Matter? Pressure transducers are typically found on commercial VRF (variable refrigerant flow)…
HVAC Thermistor Training Project
https://www.acservicetech.com/post/hvac-thermistor-training-project
Published: March 29, 2023 18:47
This training project is designed to show how bead thermistors and tube thermistors work, along with the difference in sensitivity between the two. Why does the Thermistor Matter? Thermistors are critical to the efficient operation of modern inverter…