Customer States the Unit Won’t Start
This phrase can be an assortment of items on our 48TC package units. After the inspection of the unit, you…
Tag: Packaged
“FAIL TO PRESSURE” On A 48JC04-06 (Alert A321)
So, its Friday afternoon at 4:00 PM. You get a call of no cooling on a 48/50JC 04-06 Ultra High…
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…
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…
System Vu Controller Pt 3
This month we will look at setting the fan speeds and economizer with the SystemVu Controller. Before we look at…
System Vu Controller Pt 2
Last month we introduced the SystemVu controller as a complete unit management system. It can be used as a stand-alone…
Where Does the Orange Wire Go On a Carrier Commercial Heat Pump?
Model numbers that this document pertains to: 38AUQ/40RUQ, 50FCQ, 50GCQ, 50HCQ, 50KCQ, 50TCQ No matter how long you have been…