How to Change the Blower Speed on an 820TB Furnace with a HK42FZ112 NFC Board
This article covers how to change the blower speed on furnaces equipped with the new NFC board HK42FZ112. After reading,…
Tag: basic training
How to Wire and Check a Dissipation Board
In our last article, Understanding Active Dissipation, we covered the basic reasons why a system may have a refrigerant leak…
Defrost in Cool Mode
This article is in reference to typical Carrier, Bryant, Payne, and WeatherMaker Heat Pumps. Beware of the defrost cycle in…
Handling Refrigerant & Other Gases Safely
Refrigerants and other gases used in the HVAC industry need to be respected and handled safely. The information given here…
Understanding Active Dissipation
Along with new refrigerant for 2025, we’re also seeing new components for safety to be compatible with new Federal guidelines. …
Understanding A Model Number
Why would you need to know what the letters and numbers in the model number represent? Can knowing the information…
TXV Ice Bath
Have you ever seen a stuck TXV? Carrier typically uses hard shutoff valves on their equipment. A hard shutoff TXV…
45 MBCA Ductless Unit and the “CP” Error Code
Most ductless products have all of the error codes listed in the installation and service manuals. Error codes listed in…
Defrosting Thermostats: Learning & Understanding Heat Pumps
We have multiple articles about the defrost boards for residential and commercial units on our website and each has addressed…
Ductless Units and Compatibility Verification
There are several different types of ductless heating and cooling systems. These systems can be combined with various indoor and…
