38MU/40MU Crossover System
In this article, I will explain how to wire the new crossover system for 24V communication or scenario 3 using…
Tag: split systems
38MU/40MU 18/8 Low Voltage Wiring
This month, I will be covering how to properly wire a 38MU/40MU for 24V operations and setting up the DIP…
Pressures Not Reading Right?
Have you ever put your gauges on a unit and notice that the pressure reading rises slowly, shows Zero but…
ABB VFD ACH580 Drive App
The ACH580 will be the new norm and it’s better to prepare now than later. With doing so, you will…
Does the Defrost Board Have 24VAC?
The heat pump works in heating and cooling mode but it simply will not go into defrost mode. Why won’t…
38AUZ/D with Twin Furnaces
One popular combination of Carrier equipment is twinning 2 residential furnaces together with a 6-10 ton commercial outdoor A/C unit.…
CADM Fault Code 3
What is fault code 3 on the Comfort Alert Diagnostic Module (CADM) and why am I getting nuisance trips? CADM…
Alerts vs Alarms on the Comfort Link
Disclaimer- This article does not detail on how to reset alarms because a previous article was done on this already. You…
The Unknown Soldier
Wondering why the VFD is called the Unknown Soldier? It is because it does a lot of work and goes…
How to Check the CTB During a Cooling Call
The CTB (central terminal board) is a board that is often replaced unnecessarily. A CTB is simply a junction board…